1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_bsd.inline.hpp"
41 #include "os_posix.inline.hpp"
42 #include "os_share_bsd.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/semaphore.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/vmError.hpp"
72
73 // put OS-includes here
74 # include <dlfcn.h>
75 # include <errno.h>
76 # include <fcntl.h>
77 # include <inttypes.h>
78 # include <poll.h>
79 # include <pthread.h>
80 # include <pwd.h>
81 # include <signal.h>
82 # include <stdint.h>
83 # include <stdio.h>
84 # include <string.h>
85 # include <sys/ioctl.h>
86 # include <sys/mman.h>
87 # include <sys/param.h>
88 # include <sys/resource.h>
89 # include <sys/socket.h>
90 # include <sys/stat.h>
91 # include <sys/syscall.h>
92 # include <sys/sysctl.h>
93 # include <sys/time.h>
94 # include <sys/times.h>
95 # include <sys/types.h>
96 # include <sys/wait.h>
97 # include <time.h>
98 # include <unistd.h>
99
100 #if defined(__FreeBSD__) || defined(__NetBSD__)
101 #include <elf.h>
102 #endif
103
104 #ifdef __APPLE__
105 #include <mach-o/dyld.h>
106 #endif
107
108 #ifndef MAP_ANONYMOUS
109 #define MAP_ANONYMOUS MAP_ANON
110 #endif
111
112 #define MAX_PATH (2 * K)
113
114 // for timer info max values which include all bits
115 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
116
117 ////////////////////////////////////////////////////////////////////////////////
118 // global variables
119 julong os::Bsd::_physical_memory = 0;
120
121 #ifdef __APPLE__
122 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
123 volatile uint64_t os::Bsd::_max_abstime = 0;
124 #else
125 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
126 #endif
127 pthread_t os::Bsd::_main_thread;
128 int os::Bsd::_page_size = -1;
129
130 static jlong initial_time_count=0;
131
132 static int clock_tics_per_sec = 100;
133
134 // For diagnostics to print a message once. see run_periodic_checks
135 static sigset_t check_signal_done;
136 static bool check_signals = true;
137
138 // Signal number used to suspend/resume a thread
139
140 // do not use any signal number less than SIGSEGV, see 4355769
141 static int SR_signum = SIGUSR2;
142 sigset_t SR_sigset;
143
144
145 ////////////////////////////////////////////////////////////////////////////////
146 // utility functions
147
148 static int SR_initialize();
149
150 julong os::available_memory() {
151 return Bsd::available_memory();
152 }
153
154 // available here means free
155 julong os::Bsd::available_memory() {
156 uint64_t available = physical_memory() >> 2;
157 #ifdef __APPLE__
158 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
159 vm_statistics64_data_t vmstat;
160 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
161 (host_info64_t)&vmstat, &count);
162 assert(kerr == KERN_SUCCESS,
163 "host_statistics64 failed - check mach_host_self() and count");
164 if (kerr == KERN_SUCCESS) {
165 available = vmstat.free_count * os::vm_page_size();
166 }
167 #endif
168 return available;
169 }
170
171 // for more info see :
172 // https://man.openbsd.org/sysctl.2
173 void os::Bsd::print_uptime_info(outputStream* st) {
174 struct timeval boottime;
175 size_t len = sizeof(boottime);
176 int mib[2];
177 mib[0] = CTL_KERN;
178 mib[1] = KERN_BOOTTIME;
179
180 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
181 time_t bootsec = boottime.tv_sec;
182 time_t currsec = time(NULL);
183 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
184 }
185 }
186
187 julong os::physical_memory() {
188 return Bsd::physical_memory();
189 }
190
191 // Return true if user is running as root.
192
193 bool os::have_special_privileges() {
194 static bool init = false;
195 static bool privileges = false;
196 if (!init) {
197 privileges = (getuid() != geteuid()) || (getgid() != getegid());
198 init = true;
199 }
200 return privileges;
201 }
202
203
204
205 // Cpu architecture string
206 #if defined(ZERO)
207 static char cpu_arch[] = ZERO_LIBARCH;
208 #elif defined(IA64)
209 static char cpu_arch[] = "ia64";
210 #elif defined(IA32)
211 static char cpu_arch[] = "i386";
212 #elif defined(AMD64)
213 static char cpu_arch[] = "amd64";
214 #elif defined(ARM)
215 static char cpu_arch[] = "arm";
216 #elif defined(PPC32)
217 static char cpu_arch[] = "ppc";
218 #elif defined(SPARC)
219 #ifdef _LP64
220 static char cpu_arch[] = "sparcv9";
221 #else
222 static char cpu_arch[] = "sparc";
223 #endif
224 #else
225 #error Add appropriate cpu_arch setting
226 #endif
227
228 // Compiler variant
229 #ifdef COMPILER2
230 #define COMPILER_VARIANT "server"
231 #else
232 #define COMPILER_VARIANT "client"
233 #endif
234
235
236 void os::Bsd::initialize_system_info() {
237 int mib[2];
238 size_t len;
239 int cpu_val;
240 julong mem_val;
241
242 // get processors count via hw.ncpus sysctl
243 mib[0] = CTL_HW;
244 mib[1] = HW_NCPU;
245 len = sizeof(cpu_val);
246 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
247 assert(len == sizeof(cpu_val), "unexpected data size");
248 set_processor_count(cpu_val);
249 } else {
250 set_processor_count(1); // fallback
251 }
252
253 // get physical memory via hw.memsize sysctl (hw.memsize is used
254 // since it returns a 64 bit value)
255 mib[0] = CTL_HW;
256
257 #if defined (HW_MEMSIZE) // Apple
258 mib[1] = HW_MEMSIZE;
259 #elif defined(HW_PHYSMEM) // Most of BSD
260 mib[1] = HW_PHYSMEM;
261 #elif defined(HW_REALMEM) // Old FreeBSD
262 mib[1] = HW_REALMEM;
263 #else
264 #error No ways to get physmem
265 #endif
266
267 len = sizeof(mem_val);
268 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
269 assert(len == sizeof(mem_val), "unexpected data size");
270 _physical_memory = mem_val;
271 } else {
272 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
273 }
274
275 #ifdef __OpenBSD__
276 {
277 // limit _physical_memory memory view on OpenBSD since
278 // datasize rlimit restricts us anyway.
279 struct rlimit limits;
280 getrlimit(RLIMIT_DATA, &limits);
281 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
282 }
283 #endif
284 }
285
286 #ifdef __APPLE__
287 static const char *get_home() {
288 const char *home_dir = ::getenv("HOME");
289 if ((home_dir == NULL) || (*home_dir == '\0')) {
290 struct passwd *passwd_info = getpwuid(geteuid());
291 if (passwd_info != NULL) {
292 home_dir = passwd_info->pw_dir;
293 }
294 }
295
296 return home_dir;
297 }
298 #endif
299
300 void os::init_system_properties_values() {
301 // The next steps are taken in the product version:
302 //
303 // Obtain the JAVA_HOME value from the location of libjvm.so.
304 // This library should be located at:
305 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
306 //
307 // If "/jre/lib/" appears at the right place in the path, then we
308 // assume libjvm.so is installed in a JDK and we use this path.
309 //
310 // Otherwise exit with message: "Could not create the Java virtual machine."
311 //
312 // The following extra steps are taken in the debugging version:
313 //
314 // If "/jre/lib/" does NOT appear at the right place in the path
315 // instead of exit check for $JAVA_HOME environment variable.
316 //
317 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
318 // then we append a fake suffix "hotspot/libjvm.so" to this path so
319 // it looks like libjvm.so is installed there
320 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
321 //
322 // Otherwise exit.
323 //
324 // Important note: if the location of libjvm.so changes this
325 // code needs to be changed accordingly.
326
327 // See ld(1):
328 // The linker uses the following search paths to locate required
329 // shared libraries:
330 // 1: ...
331 // ...
332 // 7: The default directories, normally /lib and /usr/lib.
333 #ifndef DEFAULT_LIBPATH
334 #ifndef OVERRIDE_LIBPATH
335 #define DEFAULT_LIBPATH "/lib:/usr/lib"
336 #else
337 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
338 #endif
339 #endif
340
341 // Base path of extensions installed on the system.
342 #define SYS_EXT_DIR "/usr/java/packages"
343 #define EXTENSIONS_DIR "/lib/ext"
344
345 #ifndef __APPLE__
346
347 // Buffer that fits several sprintfs.
348 // Note that the space for the colon and the trailing null are provided
349 // by the nulls included by the sizeof operator.
350 const size_t bufsize =
351 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
352 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
353 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
354
355 // sysclasspath, java_home, dll_dir
356 {
357 char *pslash;
358 os::jvm_path(buf, bufsize);
359
360 // Found the full path to libjvm.so.
361 // Now cut the path to <java_home>/jre if we can.
362 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
363 pslash = strrchr(buf, '/');
364 if (pslash != NULL) {
365 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
366 }
367 Arguments::set_dll_dir(buf);
368
369 if (pslash != NULL) {
370 pslash = strrchr(buf, '/');
371 if (pslash != NULL) {
372 *pslash = '\0'; // Get rid of /<arch>.
373 pslash = strrchr(buf, '/');
374 if (pslash != NULL) {
375 *pslash = '\0'; // Get rid of /lib.
376 }
377 }
378 }
379 Arguments::set_java_home(buf);
380 if (!set_boot_path('/', ':')) {
381 vm_exit_during_initialization("Failed setting boot class path.", NULL);
382 }
383 }
384
385 // Where to look for native libraries.
386 //
387 // Note: Due to a legacy implementation, most of the library path
388 // is set in the launcher. This was to accomodate linking restrictions
389 // on legacy Bsd implementations (which are no longer supported).
390 // Eventually, all the library path setting will be done here.
391 //
392 // However, to prevent the proliferation of improperly built native
393 // libraries, the new path component /usr/java/packages is added here.
394 // Eventually, all the library path setting will be done here.
395 {
396 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
397 // should always exist (until the legacy problem cited above is
398 // addressed).
399 const char *v = ::getenv("LD_LIBRARY_PATH");
400 const char *v_colon = ":";
401 if (v == NULL) { v = ""; v_colon = ""; }
402 // That's +1 for the colon and +1 for the trailing '\0'.
403 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
404 strlen(v) + 1 +
405 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
406 mtInternal);
407 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
408 Arguments::set_library_path(ld_library_path);
409 FREE_C_HEAP_ARRAY(char, ld_library_path);
410 }
411
412 // Extensions directories.
413 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
414 Arguments::set_ext_dirs(buf);
415
416 FREE_C_HEAP_ARRAY(char, buf);
417
418 #else // __APPLE__
419
420 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
421 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
422
423 const char *user_home_dir = get_home();
424 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
425 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
426 sizeof(SYS_EXTENSIONS_DIRS);
427
428 // Buffer that fits several sprintfs.
429 // Note that the space for the colon and the trailing null are provided
430 // by the nulls included by the sizeof operator.
431 const size_t bufsize =
432 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
433 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
434 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
435
436 // sysclasspath, java_home, dll_dir
437 {
438 char *pslash;
439 os::jvm_path(buf, bufsize);
440
441 // Found the full path to libjvm.so.
442 // Now cut the path to <java_home>/jre if we can.
443 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
444 pslash = strrchr(buf, '/');
445 if (pslash != NULL) {
446 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
447 }
448 #ifdef STATIC_BUILD
449 strcat(buf, "/lib");
450 #endif
451
452 Arguments::set_dll_dir(buf);
453
454 if (pslash != NULL) {
455 pslash = strrchr(buf, '/');
456 if (pslash != NULL) {
457 *pslash = '\0'; // Get rid of /lib.
458 }
459 }
460 Arguments::set_java_home(buf);
461 set_boot_path('/', ':');
462 }
463
464 // Where to look for native libraries.
465 //
466 // Note: Due to a legacy implementation, most of the library path
467 // is set in the launcher. This was to accomodate linking restrictions
468 // on legacy Bsd implementations (which are no longer supported).
469 // Eventually, all the library path setting will be done here.
470 //
471 // However, to prevent the proliferation of improperly built native
472 // libraries, the new path component /usr/java/packages is added here.
473 // Eventually, all the library path setting will be done here.
474 {
475 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
476 // should always exist (until the legacy problem cited above is
477 // addressed).
478 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
479 // can specify a directory inside an app wrapper
480 const char *l = ::getenv("JAVA_LIBRARY_PATH");
481 const char *l_colon = ":";
482 if (l == NULL) { l = ""; l_colon = ""; }
483
484 const char *v = ::getenv("DYLD_LIBRARY_PATH");
485 const char *v_colon = ":";
486 if (v == NULL) { v = ""; v_colon = ""; }
487
488 // Apple's Java6 has "." at the beginning of java.library.path.
489 // OpenJDK on Windows has "." at the end of java.library.path.
490 // OpenJDK on Linux and Solaris don't have "." in java.library.path
491 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
492 // "." is appended to the end of java.library.path. Yes, this
493 // could cause a change in behavior, but Apple's Java6 behavior
494 // can be achieved by putting "." at the beginning of the
495 // JAVA_LIBRARY_PATH environment variable.
496 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
497 strlen(v) + 1 + strlen(l) + 1 +
498 system_ext_size + 3,
499 mtInternal);
500 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
501 v, v_colon, l, l_colon, user_home_dir);
502 Arguments::set_library_path(ld_library_path);
503 FREE_C_HEAP_ARRAY(char, ld_library_path);
504 }
505
506 // Extensions directories.
507 //
508 // Note that the space for the colon and the trailing null are provided
509 // by the nulls included by the sizeof operator (so actually one byte more
510 // than necessary is allocated).
511 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
512 user_home_dir, Arguments::get_java_home());
513 Arguments::set_ext_dirs(buf);
514
515 FREE_C_HEAP_ARRAY(char, buf);
516
517 #undef SYS_EXTENSIONS_DIR
518 #undef SYS_EXTENSIONS_DIRS
519
520 #endif // __APPLE__
521
522 #undef SYS_EXT_DIR
523 #undef EXTENSIONS_DIR
524 }
525
526 ////////////////////////////////////////////////////////////////////////////////
527 // breakpoint support
528
529 void os::breakpoint() {
530 BREAKPOINT;
531 }
532
533 extern "C" void breakpoint() {
534 // use debugger to set breakpoint here
535 }
536
537 ////////////////////////////////////////////////////////////////////////////////
538 // signal support
539
540 debug_only(static bool signal_sets_initialized = false);
541 static sigset_t unblocked_sigs, vm_sigs;
542
543 void os::Bsd::signal_sets_init() {
544 // Should also have an assertion stating we are still single-threaded.
545 assert(!signal_sets_initialized, "Already initialized");
546 // Fill in signals that are necessarily unblocked for all threads in
547 // the VM. Currently, we unblock the following signals:
548 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
549 // by -Xrs (=ReduceSignalUsage));
550 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
551 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
552 // the dispositions or masks wrt these signals.
553 // Programs embedding the VM that want to use the above signals for their
554 // own purposes must, at this time, use the "-Xrs" option to prevent
555 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
556 // (See bug 4345157, and other related bugs).
557 // In reality, though, unblocking these signals is really a nop, since
558 // these signals are not blocked by default.
559 sigemptyset(&unblocked_sigs);
560 sigaddset(&unblocked_sigs, SIGILL);
561 sigaddset(&unblocked_sigs, SIGSEGV);
562 sigaddset(&unblocked_sigs, SIGBUS);
563 sigaddset(&unblocked_sigs, SIGFPE);
564 sigaddset(&unblocked_sigs, SR_signum);
565
566 if (!ReduceSignalUsage) {
567 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
568 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
569
570 }
571 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
572 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
573 }
574 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
575 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
576 }
577 }
578 // Fill in signals that are blocked by all but the VM thread.
579 sigemptyset(&vm_sigs);
580 if (!ReduceSignalUsage) {
581 sigaddset(&vm_sigs, BREAK_SIGNAL);
582 }
583 debug_only(signal_sets_initialized = true);
584
585 }
586
587 // These are signals that are unblocked while a thread is running Java.
588 // (For some reason, they get blocked by default.)
589 sigset_t* os::Bsd::unblocked_signals() {
590 assert(signal_sets_initialized, "Not initialized");
591 return &unblocked_sigs;
592 }
593
594 // These are the signals that are blocked while a (non-VM) thread is
595 // running Java. Only the VM thread handles these signals.
596 sigset_t* os::Bsd::vm_signals() {
597 assert(signal_sets_initialized, "Not initialized");
598 return &vm_sigs;
599 }
600
601 void os::Bsd::hotspot_sigmask(Thread* thread) {
602
603 //Save caller's signal mask before setting VM signal mask
604 sigset_t caller_sigmask;
605 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
606
607 OSThread* osthread = thread->osthread();
608 osthread->set_caller_sigmask(caller_sigmask);
609
610 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
611
612 if (!ReduceSignalUsage) {
613 if (thread->is_VM_thread()) {
614 // Only the VM thread handles BREAK_SIGNAL ...
615 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
616 } else {
617 // ... all other threads block BREAK_SIGNAL
618 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
619 }
620 }
621 }
622
623
624 //////////////////////////////////////////////////////////////////////////////
625 // create new thread
626
627 #ifdef __APPLE__
628 // library handle for calling objc_registerThreadWithCollector()
629 // without static linking to the libobjc library
630 #define OBJC_LIB "/usr/lib/libobjc.dylib"
631 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
632 typedef void (*objc_registerThreadWithCollector_t)();
633 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
634 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
635 #endif
636
637 #ifdef __APPLE__
638 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
639 // Additional thread_id used to correlate threads in SA
640 thread_identifier_info_data_t m_ident_info;
641 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
642
643 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
644 (thread_info_t) &m_ident_info, &count);
645
646 return m_ident_info.thread_id;
647 }
648 #endif
649
650 // Thread start routine for all newly created threads
651 static void *thread_native_entry(Thread *thread) {
652
653 thread->record_stack_base_and_size();
654
655 // Try to randomize the cache line index of hot stack frames.
656 // This helps when threads of the same stack traces evict each other's
657 // cache lines. The threads can be either from the same JVM instance, or
658 // from different JVM instances. The benefit is especially true for
659 // processors with hyperthreading technology.
660 static int counter = 0;
661 int pid = os::current_process_id();
662 alloca(((pid ^ counter++) & 7) * 128);
663
664 thread->initialize_thread_current();
665
666 OSThread* osthread = thread->osthread();
667 Monitor* sync = osthread->startThread_lock();
668
669 osthread->set_thread_id(os::Bsd::gettid());
670
671 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
672 os::current_thread_id(), (uintx) pthread_self());
673
674 #ifdef __APPLE__
675 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
676 guarantee(unique_thread_id != 0, "unique thread id was not found");
677 osthread->set_unique_thread_id(unique_thread_id);
678 #endif
679 // initialize signal mask for this thread
680 os::Bsd::hotspot_sigmask(thread);
681
682 // initialize floating point control register
683 os::Bsd::init_thread_fpu_state();
684
685 #ifdef __APPLE__
686 // register thread with objc gc
687 if (objc_registerThreadWithCollectorFunction != NULL) {
688 objc_registerThreadWithCollectorFunction();
689 }
690 #endif
691
692 // handshaking with parent thread
693 {
694 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
695
696 // notify parent thread
697 osthread->set_state(INITIALIZED);
698 sync->notify_all();
699
700 // wait until os::start_thread()
701 while (osthread->get_state() == INITIALIZED) {
702 sync->wait_without_safepoint_check();
703 }
704 }
705
706 // call one more level start routine
707 thread->call_run();
708
709 // Note: at this point the thread object may already have deleted itself.
710 // Prevent dereferencing it from here on out.
711 thread = NULL;
712
713 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
714 os::current_thread_id(), (uintx) pthread_self());
715
716 return 0;
717 }
718
719 bool os::create_thread(Thread* thread, ThreadType thr_type,
720 size_t req_stack_size) {
721 assert(thread->osthread() == NULL, "caller responsible");
722
723 // Allocate the OSThread object
724 OSThread* osthread = new OSThread(NULL, NULL);
725 if (osthread == NULL) {
726 return false;
727 }
728
729 // set the correct thread state
730 osthread->set_thread_type(thr_type);
731
732 // Initial state is ALLOCATED but not INITIALIZED
733 osthread->set_state(ALLOCATED);
734
735 thread->set_osthread(osthread);
736
737 // init thread attributes
738 pthread_attr_t attr;
739 pthread_attr_init(&attr);
740 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
741
742 // calculate stack size if it's not specified by caller
743 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
744 int status = pthread_attr_setstacksize(&attr, stack_size);
745 assert_status(status == 0, status, "pthread_attr_setstacksize");
746
747 ThreadState state;
748
749 {
750 pthread_t tid;
751 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
752
753 char buf[64];
754 if (ret == 0) {
755 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
756 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
757 } else {
758 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
759 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
760 // Log some OS information which might explain why creating the thread failed.
761 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
762 LogStream st(Log(os, thread)::info());
763 os::Posix::print_rlimit_info(&st);
764 os::print_memory_info(&st);
765 }
766
767 pthread_attr_destroy(&attr);
768
769 if (ret != 0) {
770 // Need to clean up stuff we've allocated so far
771 thread->set_osthread(NULL);
772 delete osthread;
773 return false;
774 }
775
776 // Store pthread info into the OSThread
777 osthread->set_pthread_id(tid);
778
779 // Wait until child thread is either initialized or aborted
780 {
781 Monitor* sync_with_child = osthread->startThread_lock();
782 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
783 while ((state = osthread->get_state()) == ALLOCATED) {
784 sync_with_child->wait_without_safepoint_check();
785 }
786 }
787
788 }
789
790 // Aborted due to thread limit being reached
791 if (state == ZOMBIE) {
792 thread->set_osthread(NULL);
793 delete osthread;
794 return false;
795 }
796
797 // The thread is returned suspended (in state INITIALIZED),
798 // and is started higher up in the call chain
799 assert(state == INITIALIZED, "race condition");
800 return true;
801 }
802
803 /////////////////////////////////////////////////////////////////////////////
804 // attach existing thread
805
806 // bootstrap the main thread
807 bool os::create_main_thread(JavaThread* thread) {
808 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
809 return create_attached_thread(thread);
810 }
811
812 bool os::create_attached_thread(JavaThread* thread) {
813 #ifdef ASSERT
814 thread->verify_not_published();
815 #endif
816
817 // Allocate the OSThread object
818 OSThread* osthread = new OSThread(NULL, NULL);
819
820 if (osthread == NULL) {
821 return false;
822 }
823
824 osthread->set_thread_id(os::Bsd::gettid());
825
826 // Store pthread info into the OSThread
827 #ifdef __APPLE__
828 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
829 guarantee(unique_thread_id != 0, "just checking");
830 osthread->set_unique_thread_id(unique_thread_id);
831 #endif
832 osthread->set_pthread_id(::pthread_self());
833
834 // initialize floating point control register
835 os::Bsd::init_thread_fpu_state();
836
837 // Initial thread state is RUNNABLE
838 osthread->set_state(RUNNABLE);
839
840 thread->set_osthread(osthread);
841
842 // initialize signal mask for this thread
843 // and save the caller's signal mask
844 os::Bsd::hotspot_sigmask(thread);
845
846 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
847 os::current_thread_id(), (uintx) pthread_self());
848
849 return true;
850 }
851
852 void os::pd_start_thread(Thread* thread) {
853 OSThread * osthread = thread->osthread();
854 assert(osthread->get_state() != INITIALIZED, "just checking");
855 Monitor* sync_with_child = osthread->startThread_lock();
856 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
857 sync_with_child->notify();
858 }
859
860 // Free Bsd resources related to the OSThread
861 void os::free_thread(OSThread* osthread) {
862 assert(osthread != NULL, "osthread not set");
863
864 // We are told to free resources of the argument thread,
865 // but we can only really operate on the current thread.
866 assert(Thread::current()->osthread() == osthread,
867 "os::free_thread but not current thread");
868
869 // Restore caller's signal mask
870 sigset_t sigmask = osthread->caller_sigmask();
871 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
872
873 delete osthread;
874 }
875
876 ////////////////////////////////////////////////////////////////////////////////
877 // time support
878
879 // Time since start-up in seconds to a fine granularity.
880 // Used by VMSelfDestructTimer and the MemProfiler.
881 double os::elapsedTime() {
882
883 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
884 }
885
886 jlong os::elapsed_counter() {
887 return javaTimeNanos() - initial_time_count;
888 }
889
890 jlong os::elapsed_frequency() {
891 return NANOSECS_PER_SEC; // nanosecond resolution
892 }
893
894 bool os::supports_vtime() { return true; }
895
896 double os::elapsedVTime() {
897 // better than nothing, but not much
898 return elapsedTime();
899 }
900
901 jlong os::javaTimeMillis() {
902 timeval time;
903 int status = gettimeofday(&time, NULL);
904 assert(status != -1, "bsd error");
905 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
906 }
907
908 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
909 timeval time;
910 int status = gettimeofday(&time, NULL);
911 assert(status != -1, "bsd error");
912 seconds = jlong(time.tv_sec);
913 nanos = jlong(time.tv_usec) * 1000;
914 }
915
916 #ifndef __APPLE__
917 #ifndef CLOCK_MONOTONIC
918 #define CLOCK_MONOTONIC (1)
919 #endif
920 #endif
921
922 #ifdef __APPLE__
923 void os::Bsd::clock_init() {
924 mach_timebase_info(&_timebase_info);
925 }
926 #else
927 void os::Bsd::clock_init() {
928 struct timespec res;
929 struct timespec tp;
930 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
931 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
932 // yes, monotonic clock is supported
933 _clock_gettime = ::clock_gettime;
934 }
935 }
936 #endif
937
938
939
940 #ifdef __APPLE__
941
942 jlong os::javaTimeNanos() {
943 const uint64_t tm = mach_absolute_time();
944 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
945 const uint64_t prev = Bsd::_max_abstime;
946 if (now <= prev) {
947 return prev; // same or retrograde time;
948 }
949 const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now);
950 assert(obsv >= prev, "invariant"); // Monotonicity
951 // If the CAS succeeded then we're done and return "now".
952 // If the CAS failed and the observed value "obsv" is >= now then
953 // we should return "obsv". If the CAS failed and now > obsv > prv then
954 // some other thread raced this thread and installed a new value, in which case
955 // we could either (a) retry the entire operation, (b) retry trying to install now
956 // or (c) just return obsv. We use (c). No loop is required although in some cases
957 // we might discard a higher "now" value in deference to a slightly lower but freshly
958 // installed obsv value. That's entirely benign -- it admits no new orderings compared
959 // to (a) or (b) -- and greatly reduces coherence traffic.
960 // We might also condition (c) on the magnitude of the delta between obsv and now.
961 // Avoiding excessive CAS operations to hot RW locations is critical.
962 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
963 return (prev == obsv) ? now : obsv;
964 }
965
966 #else // __APPLE__
967
968 jlong os::javaTimeNanos() {
969 if (os::supports_monotonic_clock()) {
970 struct timespec tp;
971 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
972 assert(status == 0, "gettime error");
973 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
974 return result;
975 } else {
976 timeval time;
977 int status = gettimeofday(&time, NULL);
978 assert(status != -1, "bsd error");
979 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
980 return 1000 * usecs;
981 }
982 }
983
984 #endif // __APPLE__
985
986 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
987 if (os::supports_monotonic_clock()) {
988 info_ptr->max_value = ALL_64_BITS;
989
990 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
991 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
992 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
993 } else {
994 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
995 info_ptr->max_value = ALL_64_BITS;
996
997 // gettimeofday is a real time clock so it skips
998 info_ptr->may_skip_backward = true;
999 info_ptr->may_skip_forward = true;
1000 }
1001
1002 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1003 }
1004
1005 // Return the real, user, and system times in seconds from an
1006 // arbitrary fixed point in the past.
1007 bool os::getTimesSecs(double* process_real_time,
1008 double* process_user_time,
1009 double* process_system_time) {
1010 struct tms ticks;
1011 clock_t real_ticks = times(&ticks);
1012
1013 if (real_ticks == (clock_t) (-1)) {
1014 return false;
1015 } else {
1016 double ticks_per_second = (double) clock_tics_per_sec;
1017 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1018 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1019 *process_real_time = ((double) real_ticks) / ticks_per_second;
1020
1021 return true;
1022 }
1023 }
1024
1025
1026 char * os::local_time_string(char *buf, size_t buflen) {
1027 struct tm t;
1028 time_t long_time;
1029 time(&long_time);
1030 localtime_r(&long_time, &t);
1031 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1032 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1033 t.tm_hour, t.tm_min, t.tm_sec);
1034 return buf;
1035 }
1036
1037 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1038 return localtime_r(clock, res);
1039 }
1040
1041 ////////////////////////////////////////////////////////////////////////////////
1042 // runtime exit support
1043
1044 // Note: os::shutdown() might be called very early during initialization, or
1045 // called from signal handler. Before adding something to os::shutdown(), make
1046 // sure it is async-safe and can handle partially initialized VM.
1047 void os::shutdown() {
1048
1049 // allow PerfMemory to attempt cleanup of any persistent resources
1050 perfMemory_exit();
1051
1052 // needs to remove object in file system
1053 AttachListener::abort();
1054
1055 // flush buffered output, finish log files
1056 ostream_abort();
1057
1058 // Check for abort hook
1059 abort_hook_t abort_hook = Arguments::abort_hook();
1060 if (abort_hook != NULL) {
1061 abort_hook();
1062 }
1063
1064 }
1065
1066 // Note: os::abort() might be called very early during initialization, or
1067 // called from signal handler. Before adding something to os::abort(), make
1068 // sure it is async-safe and can handle partially initialized VM.
1069 void os::abort(bool dump_core, void* siginfo, const void* context) {
1070 os::shutdown();
1071 if (dump_core) {
1072 #ifndef PRODUCT
1073 fdStream out(defaultStream::output_fd());
1074 out.print_raw("Current thread is ");
1075 char buf[16];
1076 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1077 out.print_raw_cr(buf);
1078 out.print_raw_cr("Dumping core ...");
1079 #endif
1080 ::abort(); // dump core
1081 }
1082
1083 ::exit(1);
1084 }
1085
1086 // Die immediately, no exit hook, no abort hook, no cleanup.
1087 // Dump a core file, if possible, for debugging.
1088 void os::die() {
1089 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1090 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1091 // and don't take the time to generate a core file.
1092 os::signal_raise(SIGKILL);
1093 } else {
1094 // _exit() on BsdThreads only kills current thread
1095 ::abort();
1096 }
1097 }
1098
1099 // Information of current thread in variety of formats
1100 pid_t os::Bsd::gettid() {
1101 int retval = -1;
1102
1103 #ifdef __APPLE__ //XNU kernel
1104 // despite the fact mach port is actually not a thread id use it
1105 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1106 retval = ::pthread_mach_thread_np(::pthread_self());
1107 guarantee(retval != 0, "just checking");
1108 return retval;
1109
1110 #else
1111 #ifdef __FreeBSD__
1112 retval = syscall(SYS_thr_self);
1113 #else
1114 #ifdef __OpenBSD__
1115 retval = syscall(SYS_getthrid);
1116 #else
1117 #ifdef __NetBSD__
1118 retval = (pid_t) syscall(SYS__lwp_self);
1119 #endif
1120 #endif
1121 #endif
1122 #endif
1123
1124 if (retval == -1) {
1125 return getpid();
1126 }
1127 }
1128
1129 intx os::current_thread_id() {
1130 #ifdef __APPLE__
1131 return (intx)::pthread_mach_thread_np(::pthread_self());
1132 #else
1133 return (intx)::pthread_self();
1134 #endif
1135 }
1136
1137 int os::current_process_id() {
1138 return (int)(getpid());
1139 }
1140
1141 // DLL functions
1142
1143 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1144
1145 // This must be hard coded because it's the system's temporary
1146 // directory not the java application's temp directory, ala java.io.tmpdir.
1147 #ifdef __APPLE__
1148 // macosx has a secure per-user temporary directory
1149 char temp_path_storage[PATH_MAX];
1150 const char* os::get_temp_directory() {
1151 static char *temp_path = NULL;
1152 if (temp_path == NULL) {
1153 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1154 if (pathSize == 0 || pathSize > PATH_MAX) {
1155 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1156 }
1157 temp_path = temp_path_storage;
1158 }
1159 return temp_path;
1160 }
1161 #else // __APPLE__
1162 const char* os::get_temp_directory() { return "/tmp"; }
1163 #endif // __APPLE__
1164
1165 // check if addr is inside libjvm.so
1166 bool os::address_is_in_vm(address addr) {
1167 static address libjvm_base_addr;
1168 Dl_info dlinfo;
1169
1170 if (libjvm_base_addr == NULL) {
1171 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1172 libjvm_base_addr = (address)dlinfo.dli_fbase;
1173 }
1174 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1175 }
1176
1177 if (dladdr((void *)addr, &dlinfo) != 0) {
1178 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1179 }
1180
1181 return false;
1182 }
1183
1184
1185 #define MACH_MAXSYMLEN 256
1186
1187 bool os::dll_address_to_function_name(address addr, char *buf,
1188 int buflen, int *offset,
1189 bool demangle) {
1190 // buf is not optional, but offset is optional
1191 assert(buf != NULL, "sanity check");
1192
1193 Dl_info dlinfo;
1194 char localbuf[MACH_MAXSYMLEN];
1195
1196 if (dladdr((void*)addr, &dlinfo) != 0) {
1197 // see if we have a matching symbol
1198 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1199 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1200 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1201 }
1202 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1203 return true;
1204 }
1205 // no matching symbol so try for just file info
1206 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1207 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1208 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1209 return true;
1210 }
1211 }
1212
1213 // Handle non-dynamic manually:
1214 if (dlinfo.dli_fbase != NULL &&
1215 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1216 dlinfo.dli_fbase)) {
1217 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1218 jio_snprintf(buf, buflen, "%s", localbuf);
1219 }
1220 return true;
1221 }
1222 }
1223 buf[0] = '\0';
1224 if (offset != NULL) *offset = -1;
1225 return false;
1226 }
1227
1228 // ported from solaris version
1229 bool os::dll_address_to_library_name(address addr, char* buf,
1230 int buflen, int* offset) {
1231 // buf is not optional, but offset is optional
1232 assert(buf != NULL, "sanity check");
1233
1234 Dl_info dlinfo;
1235
1236 if (dladdr((void*)addr, &dlinfo) != 0) {
1237 if (dlinfo.dli_fname != NULL) {
1238 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1239 }
1240 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1241 *offset = addr - (address)dlinfo.dli_fbase;
1242 }
1243 return true;
1244 }
1245
1246 buf[0] = '\0';
1247 if (offset) *offset = -1;
1248 return false;
1249 }
1250
1251 // Loads .dll/.so and
1252 // in case of error it checks if .dll/.so was built for the
1253 // same architecture as Hotspot is running on
1254
1255 #ifdef __APPLE__
1256 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1257 #ifdef STATIC_BUILD
1258 return os::get_default_process_handle();
1259 #else
1260 log_info(os)("attempting shared library load of %s", filename);
1261
1262 void * result= ::dlopen(filename, RTLD_LAZY);
1263 if (result != NULL) {
1264 Events::log(NULL, "Loaded shared library %s", filename);
1265 // Successful loading
1266 log_info(os)("shared library load of %s was successful", filename);
1267 return result;
1268 }
1269
1270 const char* error_report = ::dlerror();
1271 if (error_report == NULL) {
1272 error_report = "dlerror returned no error description";
1273 }
1274 if (ebuf != NULL && ebuflen > 0) {
1275 // Read system error message into ebuf
1276 ::strncpy(ebuf, error_report, ebuflen-1);
1277 ebuf[ebuflen-1]='\0';
1278 }
1279 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1280 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1281
1282 return NULL;
1283 #endif // STATIC_BUILD
1284 }
1285 #else
1286 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1287 #ifdef STATIC_BUILD
1288 return os::get_default_process_handle();
1289 #else
1290 log_info(os)("attempting shared library load of %s", filename);
1291 void * result= ::dlopen(filename, RTLD_LAZY);
1292 if (result != NULL) {
1293 Events::log(NULL, "Loaded shared library %s", filename);
1294 // Successful loading
1295 log_info(os)("shared library load of %s was successful", filename);
1296 return result;
1297 }
1298
1299 Elf32_Ehdr elf_head;
1300
1301 const char* const error_report = ::dlerror();
1302 if (error_report == NULL) {
1303 error_report = "dlerror returned no error description";
1304 }
1305 if (ebuf != NULL && ebuflen > 0) {
1306 // Read system error message into ebuf
1307 ::strncpy(ebuf, error_report, ebuflen-1);
1308 ebuf[ebuflen-1]='\0';
1309 }
1310 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1311 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1312
1313 int diag_msg_max_length=ebuflen-strlen(ebuf);
1314 char* diag_msg_buf=ebuf+strlen(ebuf);
1315
1316 if (diag_msg_max_length==0) {
1317 // No more space in ebuf for additional diagnostics message
1318 return NULL;
1319 }
1320
1321
1322 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1323
1324 if (file_descriptor < 0) {
1325 // Can't open library, report dlerror() message
1326 return NULL;
1327 }
1328
1329 bool failed_to_read_elf_head=
1330 (sizeof(elf_head)!=
1331 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1332
1333 ::close(file_descriptor);
1334 if (failed_to_read_elf_head) {
1335 // file i/o error - report dlerror() msg
1336 return NULL;
1337 }
1338
1339 typedef struct {
1340 Elf32_Half code; // Actual value as defined in elf.h
1341 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1342 char elf_class; // 32 or 64 bit
1343 char endianess; // MSB or LSB
1344 char* name; // String representation
1345 } arch_t;
1346
1347 #ifndef EM_486
1348 #define EM_486 6 /* Intel 80486 */
1349 #endif
1350
1351 #ifndef EM_MIPS_RS3_LE
1352 #define EM_MIPS_RS3_LE 10 /* MIPS */
1353 #endif
1354
1355 #ifndef EM_PPC64
1356 #define EM_PPC64 21 /* PowerPC64 */
1357 #endif
1358
1359 #ifndef EM_S390
1360 #define EM_S390 22 /* IBM System/390 */
1361 #endif
1362
1363 #ifndef EM_IA_64
1364 #define EM_IA_64 50 /* HP/Intel IA-64 */
1365 #endif
1366
1367 #ifndef EM_X86_64
1368 #define EM_X86_64 62 /* AMD x86-64 */
1369 #endif
1370
1371 static const arch_t arch_array[]={
1372 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1373 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1374 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1375 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1376 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1377 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1378 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1379 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1380 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1381 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1382 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1383 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1384 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1385 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1386 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1387 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1388 };
1389
1390 #if (defined IA32)
1391 static Elf32_Half running_arch_code=EM_386;
1392 #elif (defined AMD64)
1393 static Elf32_Half running_arch_code=EM_X86_64;
1394 #elif (defined IA64)
1395 static Elf32_Half running_arch_code=EM_IA_64;
1396 #elif (defined __sparc) && (defined _LP64)
1397 static Elf32_Half running_arch_code=EM_SPARCV9;
1398 #elif (defined __sparc) && (!defined _LP64)
1399 static Elf32_Half running_arch_code=EM_SPARC;
1400 #elif (defined __powerpc64__)
1401 static Elf32_Half running_arch_code=EM_PPC64;
1402 #elif (defined __powerpc__)
1403 static Elf32_Half running_arch_code=EM_PPC;
1404 #elif (defined ARM)
1405 static Elf32_Half running_arch_code=EM_ARM;
1406 #elif (defined S390)
1407 static Elf32_Half running_arch_code=EM_S390;
1408 #elif (defined ALPHA)
1409 static Elf32_Half running_arch_code=EM_ALPHA;
1410 #elif (defined MIPSEL)
1411 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1412 #elif (defined PARISC)
1413 static Elf32_Half running_arch_code=EM_PARISC;
1414 #elif (defined MIPS)
1415 static Elf32_Half running_arch_code=EM_MIPS;
1416 #elif (defined M68K)
1417 static Elf32_Half running_arch_code=EM_68K;
1418 #else
1419 #error Method os::dll_load requires that one of following is defined:\
1420 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1421 #endif
1422
1423 // Identify compatability class for VM's architecture and library's architecture
1424 // Obtain string descriptions for architectures
1425
1426 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1427 int running_arch_index=-1;
1428
1429 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1430 if (running_arch_code == arch_array[i].code) {
1431 running_arch_index = i;
1432 }
1433 if (lib_arch.code == arch_array[i].code) {
1434 lib_arch.compat_class = arch_array[i].compat_class;
1435 lib_arch.name = arch_array[i].name;
1436 }
1437 }
1438
1439 assert(running_arch_index != -1,
1440 "Didn't find running architecture code (running_arch_code) in arch_array");
1441 if (running_arch_index == -1) {
1442 // Even though running architecture detection failed
1443 // we may still continue with reporting dlerror() message
1444 return NULL;
1445 }
1446
1447 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1448 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1449 return NULL;
1450 }
1451
1452 #ifndef S390
1453 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1454 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1455 return NULL;
1456 }
1457 #endif // !S390
1458
1459 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1460 if (lib_arch.name!=NULL) {
1461 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1462 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1463 lib_arch.name, arch_array[running_arch_index].name);
1464 } else {
1465 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1466 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1467 lib_arch.code,
1468 arch_array[running_arch_index].name);
1469 }
1470 }
1471
1472 return NULL;
1473 #endif // STATIC_BUILD
1474 }
1475 #endif // !__APPLE__
1476
1477 void* os::get_default_process_handle() {
1478 #ifdef __APPLE__
1479 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1480 // to avoid finding unexpected symbols on second (or later)
1481 // loads of a library.
1482 return (void*)::dlopen(NULL, RTLD_FIRST);
1483 #else
1484 return (void*)::dlopen(NULL, RTLD_LAZY);
1485 #endif
1486 }
1487
1488 // XXX: Do we need a lock around this as per Linux?
1489 void* os::dll_lookup(void* handle, const char* name) {
1490 return dlsym(handle, name);
1491 }
1492
1493 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1494 outputStream * out = (outputStream *) param;
1495 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1496 return 0;
1497 }
1498
1499 void os::print_dll_info(outputStream *st) {
1500 st->print_cr("Dynamic libraries:");
1501 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1502 st->print_cr("Error: Cannot print dynamic libraries.");
1503 }
1504 }
1505
1506 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1507 #ifdef RTLD_DI_LINKMAP
1508 Dl_info dli;
1509 void *handle;
1510 Link_map *map;
1511 Link_map *p;
1512
1513 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1514 dli.dli_fname == NULL) {
1515 return 1;
1516 }
1517 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1518 if (handle == NULL) {
1519 return 1;
1520 }
1521 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1522 if (map == NULL) {
1523 dlclose(handle);
1524 return 1;
1525 }
1526
1527 while (map->l_prev != NULL)
1528 map = map->l_prev;
1529
1530 while (map != NULL) {
1531 // Value for top_address is returned as 0 since we don't have any information about module size
1532 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1533 dlclose(handle);
1534 return 1;
1535 }
1536 map = map->l_next;
1537 }
1538
1539 dlclose(handle);
1540 #elif defined(__APPLE__)
1541 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1542 // Value for top_address is returned as 0 since we don't have any information about module size
1543 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1544 return 1;
1545 }
1546 }
1547 return 0;
1548 #else
1549 return 1;
1550 #endif
1551 }
1552
1553 void os::get_summary_os_info(char* buf, size_t buflen) {
1554 // These buffers are small because we want this to be brief
1555 // and not use a lot of stack while generating the hs_err file.
1556 char os[100];
1557 size_t size = sizeof(os);
1558 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1559 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1560 #ifdef __APPLE__
1561 strncpy(os, "Darwin", sizeof(os));
1562 #elif __OpenBSD__
1563 strncpy(os, "OpenBSD", sizeof(os));
1564 #else
1565 strncpy(os, "BSD", sizeof(os));
1566 #endif
1567 }
1568
1569 char release[100];
1570 size = sizeof(release);
1571 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1572 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1573 // if error, leave blank
1574 strncpy(release, "", sizeof(release));
1575 }
1576 snprintf(buf, buflen, "%s %s", os, release);
1577 }
1578
1579 void os::print_os_info_brief(outputStream* st) {
1580 os::Posix::print_uname_info(st);
1581 }
1582
1583 void os::print_os_info(outputStream* st) {
1584 st->print("OS:");
1585
1586 os::Posix::print_uname_info(st);
1587
1588 os::Bsd::print_uptime_info(st);
1589
1590 os::Posix::print_rlimit_info(st);
1591
1592 os::Posix::print_load_average(st);
1593 }
1594
1595 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1596 // Nothing to do for now.
1597 }
1598
1599 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1600 unsigned int mhz;
1601 size_t size = sizeof(mhz);
1602 int mib[] = { CTL_HW, HW_CPU_FREQ };
1603 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1604 mhz = 1; // looks like an error but can be divided by
1605 } else {
1606 mhz /= 1000000; // reported in millions
1607 }
1608
1609 char model[100];
1610 size = sizeof(model);
1611 int mib_model[] = { CTL_HW, HW_MODEL };
1612 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1613 strncpy(model, cpu_arch, sizeof(model));
1614 }
1615
1616 char machine[100];
1617 size = sizeof(machine);
1618 int mib_machine[] = { CTL_HW, HW_MACHINE };
1619 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1620 strncpy(machine, "", sizeof(machine));
1621 }
1622
1623 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1624 }
1625
1626 void os::print_memory_info(outputStream* st) {
1627 xsw_usage swap_usage;
1628 size_t size = sizeof(swap_usage);
1629
1630 st->print("Memory:");
1631 st->print(" %dk page", os::vm_page_size()>>10);
1632
1633 st->print(", physical " UINT64_FORMAT "k",
1634 os::physical_memory() >> 10);
1635 st->print("(" UINT64_FORMAT "k free)",
1636 os::available_memory() >> 10);
1637
1638 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1639 if (size >= offset_of(xsw_usage, xsu_used)) {
1640 st->print(", swap " UINT64_FORMAT "k",
1641 ((julong) swap_usage.xsu_total) >> 10);
1642 st->print("(" UINT64_FORMAT "k free)",
1643 ((julong) swap_usage.xsu_avail) >> 10);
1644 }
1645 }
1646
1647 st->cr();
1648 }
1649
1650 static void print_signal_handler(outputStream* st, int sig,
1651 char* buf, size_t buflen);
1652
1653 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1654 st->print_cr("Signal Handlers:");
1655 print_signal_handler(st, SIGSEGV, buf, buflen);
1656 print_signal_handler(st, SIGBUS , buf, buflen);
1657 print_signal_handler(st, SIGFPE , buf, buflen);
1658 print_signal_handler(st, SIGPIPE, buf, buflen);
1659 print_signal_handler(st, SIGXFSZ, buf, buflen);
1660 print_signal_handler(st, SIGILL , buf, buflen);
1661 print_signal_handler(st, SR_signum, buf, buflen);
1662 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1663 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1664 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1665 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1666 }
1667
1668 static char saved_jvm_path[MAXPATHLEN] = {0};
1669
1670 // Find the full path to the current module, libjvm
1671 void os::jvm_path(char *buf, jint buflen) {
1672 // Error checking.
1673 if (buflen < MAXPATHLEN) {
1674 assert(false, "must use a large-enough buffer");
1675 buf[0] = '\0';
1676 return;
1677 }
1678 // Lazy resolve the path to current module.
1679 if (saved_jvm_path[0] != 0) {
1680 strcpy(buf, saved_jvm_path);
1681 return;
1682 }
1683
1684 char dli_fname[MAXPATHLEN];
1685 bool ret = dll_address_to_library_name(
1686 CAST_FROM_FN_PTR(address, os::jvm_path),
1687 dli_fname, sizeof(dli_fname), NULL);
1688 assert(ret, "cannot locate libjvm");
1689 char *rp = NULL;
1690 if (ret && dli_fname[0] != '\0') {
1691 rp = os::Posix::realpath(dli_fname, buf, buflen);
1692 }
1693 if (rp == NULL) {
1694 return;
1695 }
1696
1697 if (Arguments::sun_java_launcher_is_altjvm()) {
1698 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1699 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1700 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1701 // appears at the right place in the string, then assume we are
1702 // installed in a JDK and we're done. Otherwise, check for a
1703 // JAVA_HOME environment variable and construct a path to the JVM
1704 // being overridden.
1705
1706 const char *p = buf + strlen(buf) - 1;
1707 for (int count = 0; p > buf && count < 5; ++count) {
1708 for (--p; p > buf && *p != '/'; --p)
1709 /* empty */ ;
1710 }
1711
1712 if (strncmp(p, "/jre/lib/", 9) != 0) {
1713 // Look for JAVA_HOME in the environment.
1714 char* java_home_var = ::getenv("JAVA_HOME");
1715 if (java_home_var != NULL && java_home_var[0] != 0) {
1716 char* jrelib_p;
1717 int len;
1718
1719 // Check the current module name "libjvm"
1720 p = strrchr(buf, '/');
1721 assert(strstr(p, "/libjvm") == p, "invalid library name");
1722
1723 rp = os::Posix::realpath(java_home_var, buf, buflen);
1724 if (rp == NULL) {
1725 return;
1726 }
1727
1728 // determine if this is a legacy image or modules image
1729 // modules image doesn't have "jre" subdirectory
1730 len = strlen(buf);
1731 assert(len < buflen, "Ran out of buffer space");
1732 jrelib_p = buf + len;
1733
1734 // Add the appropriate library subdir
1735 snprintf(jrelib_p, buflen-len, "/jre/lib");
1736 if (0 != access(buf, F_OK)) {
1737 snprintf(jrelib_p, buflen-len, "/lib");
1738 }
1739
1740 // Add the appropriate client or server subdir
1741 len = strlen(buf);
1742 jrelib_p = buf + len;
1743 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1744 if (0 != access(buf, F_OK)) {
1745 snprintf(jrelib_p, buflen-len, "%s", "");
1746 }
1747
1748 // If the path exists within JAVA_HOME, add the JVM library name
1749 // to complete the path to JVM being overridden. Otherwise fallback
1750 // to the path to the current library.
1751 if (0 == access(buf, F_OK)) {
1752 // Use current module name "libjvm"
1753 len = strlen(buf);
1754 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1755 } else {
1756 // Fall back to path of current library
1757 rp = os::Posix::realpath(dli_fname, buf, buflen);
1758 if (rp == NULL) {
1759 return;
1760 }
1761 }
1762 }
1763 }
1764 }
1765
1766 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1767 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1768 }
1769
1770 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1771 // no prefix required, not even "_"
1772 }
1773
1774 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1775 // no suffix required
1776 }
1777
1778 ////////////////////////////////////////////////////////////////////////////////
1779 // sun.misc.Signal support
1780
1781 static void UserHandler(int sig, void *siginfo, void *context) {
1782 // Ctrl-C is pressed during error reporting, likely because the error
1783 // handler fails to abort. Let VM die immediately.
1784 if (sig == SIGINT && VMError::is_error_reported()) {
1785 os::die();
1786 }
1787
1788 os::signal_notify(sig);
1789 }
1790
1791 void* os::user_handler() {
1792 return CAST_FROM_FN_PTR(void*, UserHandler);
1793 }
1794
1795 extern "C" {
1796 typedef void (*sa_handler_t)(int);
1797 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1798 }
1799
1800 void* os::signal(int signal_number, void* handler) {
1801 struct sigaction sigAct, oldSigAct;
1802
1803 sigfillset(&(sigAct.sa_mask));
1804 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1805 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1806
1807 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1808 // -1 means registration failed
1809 return (void *)-1;
1810 }
1811
1812 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1813 }
1814
1815 void os::signal_raise(int signal_number) {
1816 ::raise(signal_number);
1817 }
1818
1819 // The following code is moved from os.cpp for making this
1820 // code platform specific, which it is by its very nature.
1821
1822 // Will be modified when max signal is changed to be dynamic
1823 int os::sigexitnum_pd() {
1824 return NSIG;
1825 }
1826
1827 // a counter for each possible signal value
1828 static volatile jint pending_signals[NSIG+1] = { 0 };
1829 static Semaphore* sig_sem = NULL;
1830
1831 static void jdk_misc_signal_init() {
1832 // Initialize signal structures
1833 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1834
1835 // Initialize signal semaphore
1836 sig_sem = new Semaphore();
1837 }
1838
1839 void os::signal_notify(int sig) {
1840 if (sig_sem != NULL) {
1841 Atomic::inc(&pending_signals[sig]);
1842 sig_sem->signal();
1843 } else {
1844 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1845 // initialization isn't called.
1846 assert(ReduceSignalUsage, "signal semaphore should be created");
1847 }
1848 }
1849
1850 static int check_pending_signals() {
1851 for (;;) {
1852 for (int i = 0; i < NSIG + 1; i++) {
1853 jint n = pending_signals[i];
1854 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1855 return i;
1856 }
1857 }
1858 JavaThread *thread = JavaThread::current();
1859 ThreadBlockInVM tbivm(thread);
1860
1861 bool threadIsSuspended;
1862 do {
1863 thread->set_suspend_equivalent();
1864 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1865 sig_sem->wait();
1866
1867 // were we externally suspended while we were waiting?
1868 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1869 if (threadIsSuspended) {
1870 // The semaphore has been incremented, but while we were waiting
1871 // another thread suspended us. We don't want to continue running
1872 // while suspended because that would surprise the thread that
1873 // suspended us.
1874 sig_sem->signal();
1875
1876 thread->java_suspend_self();
1877 }
1878 } while (threadIsSuspended);
1879 }
1880 }
1881
1882 int os::signal_wait() {
1883 return check_pending_signals();
1884 }
1885
1886 ////////////////////////////////////////////////////////////////////////////////
1887 // Virtual Memory
1888
1889 int os::vm_page_size() {
1890 // Seems redundant as all get out
1891 assert(os::Bsd::page_size() != -1, "must call os::init");
1892 return os::Bsd::page_size();
1893 }
1894
1895 // Solaris allocates memory by pages.
1896 int os::vm_allocation_granularity() {
1897 assert(os::Bsd::page_size() != -1, "must call os::init");
1898 return os::Bsd::page_size();
1899 }
1900
1901 // Rationale behind this function:
1902 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1903 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1904 // samples for JITted code. Here we create private executable mapping over the code cache
1905 // and then we can use standard (well, almost, as mapping can change) way to provide
1906 // info for the reporting script by storing timestamp and location of symbol
1907 void bsd_wrap_code(char* base, size_t size) {
1908 static volatile jint cnt = 0;
1909
1910 if (!UseOprofile) {
1911 return;
1912 }
1913
1914 char buf[PATH_MAX + 1];
1915 int num = Atomic::add(&cnt, 1);
1916
1917 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1918 os::get_temp_directory(), os::current_process_id(), num);
1919 unlink(buf);
1920
1921 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1922
1923 if (fd != -1) {
1924 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1925 if (rv != (off_t)-1) {
1926 if (::write(fd, "", 1) == 1) {
1927 mmap(base, size,
1928 PROT_READ|PROT_WRITE|PROT_EXEC,
1929 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1930 }
1931 }
1932 ::close(fd);
1933 unlink(buf);
1934 }
1935 }
1936
1937 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1938 int err) {
1939 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1940 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1941 os::errno_name(err), err);
1942 }
1943
1944 // NOTE: Bsd kernel does not really reserve the pages for us.
1945 // All it does is to check if there are enough free pages
1946 // left at the time of mmap(). This could be a potential
1947 // problem.
1948 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1949 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1950 #ifdef __OpenBSD__
1951 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1952 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1953 if (::mprotect(addr, size, prot) == 0) {
1954 return true;
1955 }
1956 #else
1957 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1958 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1959 if (res != (uintptr_t) MAP_FAILED) {
1960 return true;
1961 }
1962 #endif
1963
1964 // Warn about any commit errors we see in non-product builds just
1965 // in case mmap() doesn't work as described on the man page.
1966 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1967
1968 return false;
1969 }
1970
1971 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1972 bool exec) {
1973 // alignment_hint is ignored on this OS
1974 return pd_commit_memory(addr, size, exec);
1975 }
1976
1977 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1978 const char* mesg) {
1979 assert(mesg != NULL, "mesg must be specified");
1980 if (!pd_commit_memory(addr, size, exec)) {
1981 // add extra info in product mode for vm_exit_out_of_memory():
1982 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1983 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1984 }
1985 }
1986
1987 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1988 size_t alignment_hint, bool exec,
1989 const char* mesg) {
1990 // alignment_hint is ignored on this OS
1991 pd_commit_memory_or_exit(addr, size, exec, mesg);
1992 }
1993
1994 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1995 }
1996
1997 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
1998 ::madvise(addr, bytes, MADV_DONTNEED);
1999 }
2000
2001 void os::numa_make_global(char *addr, size_t bytes) {
2002 }
2003
2004 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2005 }
2006
2007 bool os::numa_topology_changed() { return false; }
2008
2009 size_t os::numa_get_groups_num() {
2010 return 1;
2011 }
2012
2013 int os::numa_get_group_id() {
2014 return 0;
2015 }
2016
2017 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2018 if (size > 0) {
2019 ids[0] = 0;
2020 return 1;
2021 }
2022 return 0;
2023 }
2024
2025 int os::numa_get_group_id_for_address(const void* address) {
2026 return 0;
2027 }
2028
2029 bool os::get_page_info(char *start, page_info* info) {
2030 return false;
2031 }
2032
2033 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2034 return end;
2035 }
2036
2037
2038 bool os::pd_uncommit_memory(char* addr, size_t size) {
2039 #ifdef __OpenBSD__
2040 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2041 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2042 return ::mprotect(addr, size, PROT_NONE) == 0;
2043 #else
2044 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2045 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2046 return res != (uintptr_t) MAP_FAILED;
2047 #endif
2048 }
2049
2050 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2051 return os::commit_memory(addr, size, !ExecMem);
2052 }
2053
2054 // If this is a growable mapping, remove the guard pages entirely by
2055 // munmap()ping them. If not, just call uncommit_memory().
2056 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2057 return os::uncommit_memory(addr, size);
2058 }
2059
2060 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2061 // at 'requested_addr'. If there are existing memory mappings at the same
2062 // location, however, they will be overwritten. If 'fixed' is false,
2063 // 'requested_addr' is only treated as a hint, the return value may or
2064 // may not start from the requested address. Unlike Bsd mmap(), this
2065 // function returns NULL to indicate failure.
2066 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2067 char * addr;
2068 int flags;
2069
2070 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2071 if (fixed) {
2072 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2073 flags |= MAP_FIXED;
2074 }
2075
2076 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2077 // touch an uncommitted page. Otherwise, the read/write might
2078 // succeed if we have enough swap space to back the physical page.
2079 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2080 flags, -1, 0);
2081
2082 return addr == MAP_FAILED ? NULL : addr;
2083 }
2084
2085 static int anon_munmap(char * addr, size_t size) {
2086 return ::munmap(addr, size) == 0;
2087 }
2088
2089 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2090 size_t alignment_hint) {
2091 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2092 }
2093
2094 bool os::pd_release_memory(char* addr, size_t size) {
2095 return anon_munmap(addr, size);
2096 }
2097
2098 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2099 // Bsd wants the mprotect address argument to be page aligned.
2100 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2101
2102 // According to SUSv3, mprotect() should only be used with mappings
2103 // established by mmap(), and mmap() always maps whole pages. Unaligned
2104 // 'addr' likely indicates problem in the VM (e.g. trying to change
2105 // protection of malloc'ed or statically allocated memory). Check the
2106 // caller if you hit this assert.
2107 assert(addr == bottom, "sanity check");
2108
2109 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2110 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2111 return ::mprotect(bottom, size, prot) == 0;
2112 }
2113
2114 // Set protections specified
2115 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2116 bool is_committed) {
2117 unsigned int p = 0;
2118 switch (prot) {
2119 case MEM_PROT_NONE: p = PROT_NONE; break;
2120 case MEM_PROT_READ: p = PROT_READ; break;
2121 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2122 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2123 default:
2124 ShouldNotReachHere();
2125 }
2126 // is_committed is unused.
2127 return bsd_mprotect(addr, bytes, p);
2128 }
2129
2130 bool os::guard_memory(char* addr, size_t size) {
2131 return bsd_mprotect(addr, size, PROT_NONE);
2132 }
2133
2134 bool os::unguard_memory(char* addr, size_t size) {
2135 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2136 }
2137
2138 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2139 return false;
2140 }
2141
2142 // Large page support
2143
2144 static size_t _large_page_size = 0;
2145
2146 void os::large_page_init() {
2147 }
2148
2149
2150 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2151 fatal("os::reserve_memory_special should not be called on BSD.");
2152 return NULL;
2153 }
2154
2155 bool os::release_memory_special(char* base, size_t bytes) {
2156 fatal("os::release_memory_special should not be called on BSD.");
2157 return false;
2158 }
2159
2160 size_t os::large_page_size() {
2161 return _large_page_size;
2162 }
2163
2164 bool os::can_commit_large_page_memory() {
2165 // Does not matter, we do not support huge pages.
2166 return false;
2167 }
2168
2169 bool os::can_execute_large_page_memory() {
2170 // Does not matter, we do not support huge pages.
2171 return false;
2172 }
2173
2174 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2175 assert(file_desc >= 0, "file_desc is not valid");
2176 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2177 if (result != NULL) {
2178 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2179 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2180 }
2181 }
2182 return result;
2183 }
2184
2185 // Reserve memory at an arbitrary address, only if that area is
2186 // available (and not reserved for something else).
2187
2188 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2189 // Assert only that the size is a multiple of the page size, since
2190 // that's all that mmap requires, and since that's all we really know
2191 // about at this low abstraction level. If we need higher alignment,
2192 // we can either pass an alignment to this method or verify alignment
2193 // in one of the methods further up the call chain. See bug 5044738.
2194 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2195
2196 // Repeatedly allocate blocks until the block is allocated at the
2197 // right spot.
2198
2199 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2200 // if kernel honors the hint then we can return immediately.
2201 char * addr = anon_mmap(requested_addr, bytes, false);
2202 if (addr == requested_addr) {
2203 return requested_addr;
2204 }
2205
2206 if (addr != NULL) {
2207 // mmap() is successful but it fails to reserve at the requested address
2208 anon_munmap(addr, bytes);
2209 }
2210
2211 return NULL;
2212 }
2213
2214 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2215 void os::infinite_sleep() {
2216 while (true) { // sleep forever ...
2217 ::sleep(100); // ... 100 seconds at a time
2218 }
2219 }
2220
2221 // Used to convert frequent JVM_Yield() to nops
2222 bool os::dont_yield() {
2223 return DontYieldALot;
2224 }
2225
2226 void os::naked_yield() {
2227 sched_yield();
2228 }
2229
2230 ////////////////////////////////////////////////////////////////////////////////
2231 // thread priority support
2232
2233 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2234 // only supports dynamic priority, static priority must be zero. For real-time
2235 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2236 // However, for large multi-threaded applications, SCHED_RR is not only slower
2237 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2238 // of 5 runs - Sep 2005).
2239 //
2240 // The following code actually changes the niceness of kernel-thread/LWP. It
2241 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2242 // not the entire user process, and user level threads are 1:1 mapped to kernel
2243 // threads. It has always been the case, but could change in the future. For
2244 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2245 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2246 // (e.g., root privilege or CAP_SYS_NICE capability).
2247
2248 #if !defined(__APPLE__)
2249 int os::java_to_os_priority[CriticalPriority + 1] = {
2250 19, // 0 Entry should never be used
2251
2252 0, // 1 MinPriority
2253 3, // 2
2254 6, // 3
2255
2256 10, // 4
2257 15, // 5 NormPriority
2258 18, // 6
2259
2260 21, // 7
2261 25, // 8
2262 28, // 9 NearMaxPriority
2263
2264 31, // 10 MaxPriority
2265
2266 31 // 11 CriticalPriority
2267 };
2268 #else
2269 // Using Mach high-level priority assignments
2270 int os::java_to_os_priority[CriticalPriority + 1] = {
2271 0, // 0 Entry should never be used (MINPRI_USER)
2272
2273 27, // 1 MinPriority
2274 28, // 2
2275 29, // 3
2276
2277 30, // 4
2278 31, // 5 NormPriority (BASEPRI_DEFAULT)
2279 32, // 6
2280
2281 33, // 7
2282 34, // 8
2283 35, // 9 NearMaxPriority
2284
2285 36, // 10 MaxPriority
2286
2287 36 // 11 CriticalPriority
2288 };
2289 #endif
2290
2291 static int prio_init() {
2292 if (ThreadPriorityPolicy == 1) {
2293 if (geteuid() != 0) {
2294 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2295 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2296 "e.g., being the root user. If the necessary permission is not " \
2297 "possessed, changes to priority will be silently ignored.");
2298 }
2299 }
2300 }
2301 if (UseCriticalJavaThreadPriority) {
2302 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2303 }
2304 return 0;
2305 }
2306
2307 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2308 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2309
2310 #ifdef __OpenBSD__
2311 // OpenBSD pthread_setprio starves low priority threads
2312 return OS_OK;
2313 #elif defined(__FreeBSD__)
2314 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2315 return (ret == 0) ? OS_OK : OS_ERR;
2316 #elif defined(__APPLE__) || defined(__NetBSD__)
2317 struct sched_param sp;
2318 int policy;
2319
2320 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2321 return OS_ERR;
2322 }
2323
2324 sp.sched_priority = newpri;
2325 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2326 return OS_ERR;
2327 }
2328
2329 return OS_OK;
2330 #else
2331 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2332 return (ret == 0) ? OS_OK : OS_ERR;
2333 #endif
2334 }
2335
2336 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2337 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2338 *priority_ptr = java_to_os_priority[NormPriority];
2339 return OS_OK;
2340 }
2341
2342 errno = 0;
2343 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2344 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2345 #elif defined(__APPLE__) || defined(__NetBSD__)
2346 int policy;
2347 struct sched_param sp;
2348
2349 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2350 if (res != 0) {
2351 *priority_ptr = -1;
2352 return OS_ERR;
2353 } else {
2354 *priority_ptr = sp.sched_priority;
2355 return OS_OK;
2356 }
2357 #else
2358 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2359 #endif
2360 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2361 }
2362
2363 ////////////////////////////////////////////////////////////////////////////////
2364 // suspend/resume support
2365
2366 // The low-level signal-based suspend/resume support is a remnant from the
2367 // old VM-suspension that used to be for java-suspension, safepoints etc,
2368 // within hotspot. Currently used by JFR's OSThreadSampler
2369 //
2370 // The remaining code is greatly simplified from the more general suspension
2371 // code that used to be used.
2372 //
2373 // The protocol is quite simple:
2374 // - suspend:
2375 // - sends a signal to the target thread
2376 // - polls the suspend state of the osthread using a yield loop
2377 // - target thread signal handler (SR_handler) sets suspend state
2378 // and blocks in sigsuspend until continued
2379 // - resume:
2380 // - sets target osthread state to continue
2381 // - sends signal to end the sigsuspend loop in the SR_handler
2382 //
2383 // Note that the SR_lock plays no role in this suspend/resume protocol,
2384 // but is checked for NULL in SR_handler as a thread termination indicator.
2385 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2386 //
2387 // Note that resume_clear_context() and suspend_save_context() are needed
2388 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2389 // which in part is used by:
2390 // - Forte Analyzer: AsyncGetCallTrace()
2391 // - StackBanging: get_frame_at_stack_banging_point()
2392
2393 static void resume_clear_context(OSThread *osthread) {
2394 osthread->set_ucontext(NULL);
2395 osthread->set_siginfo(NULL);
2396 }
2397
2398 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2399 osthread->set_ucontext(context);
2400 osthread->set_siginfo(siginfo);
2401 }
2402
2403 // Handler function invoked when a thread's execution is suspended or
2404 // resumed. We have to be careful that only async-safe functions are
2405 // called here (Note: most pthread functions are not async safe and
2406 // should be avoided.)
2407 //
2408 // Note: sigwait() is a more natural fit than sigsuspend() from an
2409 // interface point of view, but sigwait() prevents the signal hander
2410 // from being run. libpthread would get very confused by not having
2411 // its signal handlers run and prevents sigwait()'s use with the
2412 // mutex granting granting signal.
2413 //
2414 // Currently only ever called on the VMThread or JavaThread
2415 //
2416 #ifdef __APPLE__
2417 static OSXSemaphore sr_semaphore;
2418 #else
2419 static PosixSemaphore sr_semaphore;
2420 #endif
2421
2422 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2423 // Save and restore errno to avoid confusing native code with EINTR
2424 // after sigsuspend.
2425 int old_errno = errno;
2426
2427 Thread* thread = Thread::current_or_null_safe();
2428 assert(thread != NULL, "Missing current thread in SR_handler");
2429
2430 // On some systems we have seen signal delivery get "stuck" until the signal
2431 // mask is changed as part of thread termination. Check that the current thread
2432 // has not already terminated (via SR_lock()) - else the following assertion
2433 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2434 // destructor has completed.
2435
2436 if (thread->SR_lock() == NULL) {
2437 return;
2438 }
2439
2440 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2441
2442 OSThread* osthread = thread->osthread();
2443
2444 os::SuspendResume::State current = osthread->sr.state();
2445 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2446 suspend_save_context(osthread, siginfo, context);
2447
2448 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2449 os::SuspendResume::State state = osthread->sr.suspended();
2450 if (state == os::SuspendResume::SR_SUSPENDED) {
2451 sigset_t suspend_set; // signals for sigsuspend()
2452
2453 // get current set of blocked signals and unblock resume signal
2454 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2455 sigdelset(&suspend_set, SR_signum);
2456
2457 sr_semaphore.signal();
2458 // wait here until we are resumed
2459 while (1) {
2460 sigsuspend(&suspend_set);
2461
2462 os::SuspendResume::State result = osthread->sr.running();
2463 if (result == os::SuspendResume::SR_RUNNING) {
2464 sr_semaphore.signal();
2465 break;
2466 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2467 ShouldNotReachHere();
2468 }
2469 }
2470
2471 } else if (state == os::SuspendResume::SR_RUNNING) {
2472 // request was cancelled, continue
2473 } else {
2474 ShouldNotReachHere();
2475 }
2476
2477 resume_clear_context(osthread);
2478 } else if (current == os::SuspendResume::SR_RUNNING) {
2479 // request was cancelled, continue
2480 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2481 // ignore
2482 } else {
2483 // ignore
2484 }
2485
2486 errno = old_errno;
2487 }
2488
2489
2490 static int SR_initialize() {
2491 struct sigaction act;
2492 char *s;
2493 // Get signal number to use for suspend/resume
2494 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2495 int sig = ::strtol(s, 0, 10);
2496 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2497 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2498 SR_signum = sig;
2499 } else {
2500 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2501 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2502 }
2503 }
2504
2505 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2506 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2507
2508 sigemptyset(&SR_sigset);
2509 sigaddset(&SR_sigset, SR_signum);
2510
2511 // Set up signal handler for suspend/resume
2512 act.sa_flags = SA_RESTART|SA_SIGINFO;
2513 act.sa_handler = (void (*)(int)) SR_handler;
2514
2515 // SR_signum is blocked by default.
2516 // 4528190 - We also need to block pthread restart signal (32 on all
2517 // supported Bsd platforms). Note that BsdThreads need to block
2518 // this signal for all threads to work properly. So we don't have
2519 // to use hard-coded signal number when setting up the mask.
2520 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2521
2522 if (sigaction(SR_signum, &act, 0) == -1) {
2523 return -1;
2524 }
2525
2526 // Save signal flag
2527 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2528 return 0;
2529 }
2530
2531 static int sr_notify(OSThread* osthread) {
2532 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2533 assert_status(status == 0, status, "pthread_kill");
2534 return status;
2535 }
2536
2537 // "Randomly" selected value for how long we want to spin
2538 // before bailing out on suspending a thread, also how often
2539 // we send a signal to a thread we want to resume
2540 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2541 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2542
2543 // returns true on success and false on error - really an error is fatal
2544 // but this seems the normal response to library errors
2545 static bool do_suspend(OSThread* osthread) {
2546 assert(osthread->sr.is_running(), "thread should be running");
2547 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2548
2549 // mark as suspended and send signal
2550 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2551 // failed to switch, state wasn't running?
2552 ShouldNotReachHere();
2553 return false;
2554 }
2555
2556 if (sr_notify(osthread) != 0) {
2557 ShouldNotReachHere();
2558 }
2559
2560 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2561 while (true) {
2562 if (sr_semaphore.timedwait(2)) {
2563 break;
2564 } else {
2565 // timeout
2566 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2567 if (cancelled == os::SuspendResume::SR_RUNNING) {
2568 return false;
2569 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2570 // make sure that we consume the signal on the semaphore as well
2571 sr_semaphore.wait();
2572 break;
2573 } else {
2574 ShouldNotReachHere();
2575 return false;
2576 }
2577 }
2578 }
2579
2580 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2581 return true;
2582 }
2583
2584 static void do_resume(OSThread* osthread) {
2585 assert(osthread->sr.is_suspended(), "thread should be suspended");
2586 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2587
2588 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2589 // failed to switch to WAKEUP_REQUEST
2590 ShouldNotReachHere();
2591 return;
2592 }
2593
2594 while (true) {
2595 if (sr_notify(osthread) == 0) {
2596 if (sr_semaphore.timedwait(2)) {
2597 if (osthread->sr.is_running()) {
2598 return;
2599 }
2600 }
2601 } else {
2602 ShouldNotReachHere();
2603 }
2604 }
2605
2606 guarantee(osthread->sr.is_running(), "Must be running!");
2607 }
2608
2609 ///////////////////////////////////////////////////////////////////////////////////
2610 // signal handling (except suspend/resume)
2611
2612 // This routine may be used by user applications as a "hook" to catch signals.
2613 // The user-defined signal handler must pass unrecognized signals to this
2614 // routine, and if it returns true (non-zero), then the signal handler must
2615 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2616 // routine will never retun false (zero), but instead will execute a VM panic
2617 // routine kill the process.
2618 //
2619 // If this routine returns false, it is OK to call it again. This allows
2620 // the user-defined signal handler to perform checks either before or after
2621 // the VM performs its own checks. Naturally, the user code would be making
2622 // a serious error if it tried to handle an exception (such as a null check
2623 // or breakpoint) that the VM was generating for its own correct operation.
2624 //
2625 // This routine may recognize any of the following kinds of signals:
2626 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2627 // It should be consulted by handlers for any of those signals.
2628 //
2629 // The caller of this routine must pass in the three arguments supplied
2630 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2631 // field of the structure passed to sigaction(). This routine assumes that
2632 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2633 //
2634 // Note that the VM will print warnings if it detects conflicting signal
2635 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2636 //
2637 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2638 void* ucontext,
2639 int abort_if_unrecognized);
2640
2641 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2642 assert(info != NULL && uc != NULL, "it must be old kernel");
2643 int orig_errno = errno; // Preserve errno value over signal handler.
2644 JVM_handle_bsd_signal(sig, info, uc, true);
2645 errno = orig_errno;
2646 }
2647
2648
2649 // This boolean allows users to forward their own non-matching signals
2650 // to JVM_handle_bsd_signal, harmlessly.
2651 bool os::Bsd::signal_handlers_are_installed = false;
2652
2653 // For signal-chaining
2654 bool os::Bsd::libjsig_is_loaded = false;
2655 typedef struct sigaction *(*get_signal_t)(int);
2656 get_signal_t os::Bsd::get_signal_action = NULL;
2657
2658 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2659 struct sigaction *actp = NULL;
2660
2661 if (libjsig_is_loaded) {
2662 // Retrieve the old signal handler from libjsig
2663 actp = (*get_signal_action)(sig);
2664 }
2665 if (actp == NULL) {
2666 // Retrieve the preinstalled signal handler from jvm
2667 actp = os::Posix::get_preinstalled_handler(sig);
2668 }
2669
2670 return actp;
2671 }
2672
2673 static bool call_chained_handler(struct sigaction *actp, int sig,
2674 siginfo_t *siginfo, void *context) {
2675 // Call the old signal handler
2676 if (actp->sa_handler == SIG_DFL) {
2677 // It's more reasonable to let jvm treat it as an unexpected exception
2678 // instead of taking the default action.
2679 return false;
2680 } else if (actp->sa_handler != SIG_IGN) {
2681 if ((actp->sa_flags & SA_NODEFER) == 0) {
2682 // automaticlly block the signal
2683 sigaddset(&(actp->sa_mask), sig);
2684 }
2685
2686 sa_handler_t hand;
2687 sa_sigaction_t sa;
2688 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2689 // retrieve the chained handler
2690 if (siginfo_flag_set) {
2691 sa = actp->sa_sigaction;
2692 } else {
2693 hand = actp->sa_handler;
2694 }
2695
2696 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2697 actp->sa_handler = SIG_DFL;
2698 }
2699
2700 // try to honor the signal mask
2701 sigset_t oset;
2702 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2703
2704 // call into the chained handler
2705 if (siginfo_flag_set) {
2706 (*sa)(sig, siginfo, context);
2707 } else {
2708 (*hand)(sig);
2709 }
2710
2711 // restore the signal mask
2712 pthread_sigmask(SIG_SETMASK, &oset, 0);
2713 }
2714 // Tell jvm's signal handler the signal is taken care of.
2715 return true;
2716 }
2717
2718 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2719 bool chained = false;
2720 // signal-chaining
2721 if (UseSignalChaining) {
2722 struct sigaction *actp = get_chained_signal_action(sig);
2723 if (actp != NULL) {
2724 chained = call_chained_handler(actp, sig, siginfo, context);
2725 }
2726 }
2727 return chained;
2728 }
2729
2730 // for diagnostic
2731 int sigflags[NSIG];
2732
2733 int os::Bsd::get_our_sigflags(int sig) {
2734 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2735 return sigflags[sig];
2736 }
2737
2738 void os::Bsd::set_our_sigflags(int sig, int flags) {
2739 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2740 if (sig > 0 && sig < NSIG) {
2741 sigflags[sig] = flags;
2742 }
2743 }
2744
2745 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2746 // Check for overwrite.
2747 struct sigaction oldAct;
2748 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2749
2750 void* oldhand = oldAct.sa_sigaction
2751 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2752 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2753 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2754 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2755 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2756 if (AllowUserSignalHandlers || !set_installed) {
2757 // Do not overwrite; user takes responsibility to forward to us.
2758 return;
2759 } else if (UseSignalChaining) {
2760 // save the old handler in jvm
2761 os::Posix::save_preinstalled_handler(sig, oldAct);
2762 // libjsig also interposes the sigaction() call below and saves the
2763 // old sigaction on it own.
2764 } else {
2765 fatal("Encountered unexpected pre-existing sigaction handler "
2766 "%#lx for signal %d.", (long)oldhand, sig);
2767 }
2768 }
2769
2770 struct sigaction sigAct;
2771 sigfillset(&(sigAct.sa_mask));
2772 sigAct.sa_handler = SIG_DFL;
2773 if (!set_installed) {
2774 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2775 } else {
2776 sigAct.sa_sigaction = signalHandler;
2777 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2778 }
2779 #ifdef __APPLE__
2780 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2781 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2782 // if the signal handler declares it will handle it on alternate stack.
2783 // Notice we only declare we will handle it on alt stack, but we are not
2784 // actually going to use real alt stack - this is just a workaround.
2785 // Please see ux_exception.c, method catch_mach_exception_raise for details
2786 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2787 if (sig == SIGSEGV) {
2788 sigAct.sa_flags |= SA_ONSTACK;
2789 }
2790 #endif
2791
2792 // Save flags, which are set by ours
2793 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2794 sigflags[sig] = sigAct.sa_flags;
2795
2796 int ret = sigaction(sig, &sigAct, &oldAct);
2797 assert(ret == 0, "check");
2798
2799 void* oldhand2 = oldAct.sa_sigaction
2800 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2801 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2802 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2803 }
2804
2805 // install signal handlers for signals that HotSpot needs to
2806 // handle in order to support Java-level exception handling.
2807
2808 void os::Bsd::install_signal_handlers() {
2809 if (!signal_handlers_are_installed) {
2810 signal_handlers_are_installed = true;
2811
2812 // signal-chaining
2813 typedef void (*signal_setting_t)();
2814 signal_setting_t begin_signal_setting = NULL;
2815 signal_setting_t end_signal_setting = NULL;
2816 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2817 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2818 if (begin_signal_setting != NULL) {
2819 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2820 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2821 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2822 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2823 libjsig_is_loaded = true;
2824 assert(UseSignalChaining, "should enable signal-chaining");
2825 }
2826 if (libjsig_is_loaded) {
2827 // Tell libjsig jvm is setting signal handlers
2828 (*begin_signal_setting)();
2829 }
2830
2831 set_signal_handler(SIGSEGV, true);
2832 set_signal_handler(SIGPIPE, true);
2833 set_signal_handler(SIGBUS, true);
2834 set_signal_handler(SIGILL, true);
2835 set_signal_handler(SIGFPE, true);
2836 set_signal_handler(SIGXFSZ, true);
2837
2838 #if defined(__APPLE__)
2839 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2840 // signals caught and handled by the JVM. To work around this, we reset the mach task
2841 // signal handler that's placed on our process by CrashReporter. This disables
2842 // CrashReporter-based reporting.
2843 //
2844 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2845 // on caught fatal signals.
2846 //
2847 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2848 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2849 // exception handling, while leaving the standard BSD signal handlers functional.
2850 kern_return_t kr;
2851 kr = task_set_exception_ports(mach_task_self(),
2852 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2853 MACH_PORT_NULL,
2854 EXCEPTION_STATE_IDENTITY,
2855 MACHINE_THREAD_STATE);
2856
2857 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2858 #endif
2859
2860 if (libjsig_is_loaded) {
2861 // Tell libjsig jvm finishes setting signal handlers
2862 (*end_signal_setting)();
2863 }
2864
2865 // We don't activate signal checker if libjsig is in place, we trust ourselves
2866 // and if UserSignalHandler is installed all bets are off
2867 if (CheckJNICalls) {
2868 if (libjsig_is_loaded) {
2869 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
2870 check_signals = false;
2871 }
2872 if (AllowUserSignalHandlers) {
2873 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2874 check_signals = false;
2875 }
2876 }
2877 }
2878 }
2879
2880
2881 /////
2882 // glibc on Bsd platform uses non-documented flag
2883 // to indicate, that some special sort of signal
2884 // trampoline is used.
2885 // We will never set this flag, and we should
2886 // ignore this flag in our diagnostic
2887 #ifdef SIGNIFICANT_SIGNAL_MASK
2888 #undef SIGNIFICANT_SIGNAL_MASK
2889 #endif
2890 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2891
2892 static const char* get_signal_handler_name(address handler,
2893 char* buf, int buflen) {
2894 int offset;
2895 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2896 if (found) {
2897 // skip directory names
2898 const char *p1, *p2;
2899 p1 = buf;
2900 size_t len = strlen(os::file_separator());
2901 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2902 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2903 } else {
2904 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2905 }
2906 return buf;
2907 }
2908
2909 static void print_signal_handler(outputStream* st, int sig,
2910 char* buf, size_t buflen) {
2911 struct sigaction sa;
2912
2913 sigaction(sig, NULL, &sa);
2914
2915 // See comment for SIGNIFICANT_SIGNAL_MASK define
2916 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2917
2918 st->print("%s: ", os::exception_name(sig, buf, buflen));
2919
2920 address handler = (sa.sa_flags & SA_SIGINFO)
2921 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2922 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2923
2924 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2925 st->print("SIG_DFL");
2926 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2927 st->print("SIG_IGN");
2928 } else {
2929 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2930 }
2931
2932 st->print(", sa_mask[0]=");
2933 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2934
2935 address rh = VMError::get_resetted_sighandler(sig);
2936 // May be, handler was resetted by VMError?
2937 if (rh != NULL) {
2938 handler = rh;
2939 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2940 }
2941
2942 st->print(", sa_flags=");
2943 os::Posix::print_sa_flags(st, sa.sa_flags);
2944
2945 // Check: is it our handler?
2946 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2947 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2948 // It is our signal handler
2949 // check for flags, reset system-used one!
2950 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2951 st->print(
2952 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2953 os::Bsd::get_our_sigflags(sig));
2954 }
2955 }
2956 st->cr();
2957 }
2958
2959
2960 #define DO_SIGNAL_CHECK(sig) \
2961 do { \
2962 if (!sigismember(&check_signal_done, sig)) { \
2963 os::Bsd::check_signal_handler(sig); \
2964 } \
2965 } while (0)
2966
2967 // This method is a periodic task to check for misbehaving JNI applications
2968 // under CheckJNI, we can add any periodic checks here
2969
2970 void os::run_periodic_checks() {
2971
2972 if (check_signals == false) return;
2973
2974 // SEGV and BUS if overridden could potentially prevent
2975 // generation of hs*.log in the event of a crash, debugging
2976 // such a case can be very challenging, so we absolutely
2977 // check the following for a good measure:
2978 DO_SIGNAL_CHECK(SIGSEGV);
2979 DO_SIGNAL_CHECK(SIGILL);
2980 DO_SIGNAL_CHECK(SIGFPE);
2981 DO_SIGNAL_CHECK(SIGBUS);
2982 DO_SIGNAL_CHECK(SIGPIPE);
2983 DO_SIGNAL_CHECK(SIGXFSZ);
2984
2985
2986 // ReduceSignalUsage allows the user to override these handlers
2987 // see comments at the very top and jvm_md.h
2988 if (!ReduceSignalUsage) {
2989 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
2990 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
2991 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
2992 DO_SIGNAL_CHECK(BREAK_SIGNAL);
2993 }
2994
2995 DO_SIGNAL_CHECK(SR_signum);
2996 }
2997
2998 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
2999
3000 static os_sigaction_t os_sigaction = NULL;
3001
3002 void os::Bsd::check_signal_handler(int sig) {
3003 char buf[O_BUFLEN];
3004 address jvmHandler = NULL;
3005
3006
3007 struct sigaction act;
3008 if (os_sigaction == NULL) {
3009 // only trust the default sigaction, in case it has been interposed
3010 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3011 if (os_sigaction == NULL) return;
3012 }
3013
3014 os_sigaction(sig, (struct sigaction*)NULL, &act);
3015
3016
3017 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3018
3019 address thisHandler = (act.sa_flags & SA_SIGINFO)
3020 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3021 : CAST_FROM_FN_PTR(address, act.sa_handler);
3022
3023
3024 switch (sig) {
3025 case SIGSEGV:
3026 case SIGBUS:
3027 case SIGFPE:
3028 case SIGPIPE:
3029 case SIGILL:
3030 case SIGXFSZ:
3031 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3032 break;
3033
3034 case SHUTDOWN1_SIGNAL:
3035 case SHUTDOWN2_SIGNAL:
3036 case SHUTDOWN3_SIGNAL:
3037 case BREAK_SIGNAL:
3038 jvmHandler = (address)user_handler();
3039 break;
3040
3041 default:
3042 if (sig == SR_signum) {
3043 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3044 } else {
3045 return;
3046 }
3047 break;
3048 }
3049
3050 if (thisHandler != jvmHandler) {
3051 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3052 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3053 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3054 // No need to check this sig any longer
3055 sigaddset(&check_signal_done, sig);
3056 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3057 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3058 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3059 exception_name(sig, buf, O_BUFLEN));
3060 }
3061 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3062 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3063 tty->print("expected:");
3064 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3065 tty->cr();
3066 tty->print(" found:");
3067 os::Posix::print_sa_flags(tty, act.sa_flags);
3068 tty->cr();
3069 // No need to check this sig any longer
3070 sigaddset(&check_signal_done, sig);
3071 }
3072
3073 // Dump all the signal
3074 if (sigismember(&check_signal_done, sig)) {
3075 print_signal_handlers(tty, buf, O_BUFLEN);
3076 }
3077 }
3078
3079 extern void report_error(char* file_name, int line_no, char* title,
3080 char* format, ...);
3081
3082 // this is called _before_ the most of global arguments have been parsed
3083 void os::init(void) {
3084 char dummy; // used to get a guess on initial stack address
3085
3086 clock_tics_per_sec = CLK_TCK;
3087
3088 init_random(1234567);
3089
3090 Bsd::set_page_size(getpagesize());
3091 if (Bsd::page_size() == -1) {
3092 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3093 }
3094 init_page_sizes((size_t) Bsd::page_size());
3095
3096 Bsd::initialize_system_info();
3097
3098 // _main_thread points to the thread that created/loaded the JVM.
3099 Bsd::_main_thread = pthread_self();
3100
3101 Bsd::clock_init();
3102 initial_time_count = javaTimeNanos();
3103
3104 os::Posix::init();
3105 }
3106
3107 // To install functions for atexit system call
3108 extern "C" {
3109 static void perfMemory_exit_helper() {
3110 perfMemory_exit();
3111 }
3112 }
3113
3114 // this is called _after_ the global arguments have been parsed
3115 jint os::init_2(void) {
3116
3117 // This could be set after os::Posix::init() but all platforms
3118 // have to set it the same so we have to mirror Solaris.
3119 DEBUG_ONLY(os::set_mutex_init_done();)
3120
3121 os::Posix::init_2();
3122
3123 // initialize suspend/resume support - must do this before signal_sets_init()
3124 if (SR_initialize() != 0) {
3125 perror("SR_initialize failed");
3126 return JNI_ERR;
3127 }
3128
3129 Bsd::signal_sets_init();
3130 Bsd::install_signal_handlers();
3131 // Initialize data for jdk.internal.misc.Signal
3132 if (!ReduceSignalUsage) {
3133 jdk_misc_signal_init();
3134 }
3135
3136 // Check and sets minimum stack sizes against command line options
3137 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3138 return JNI_ERR;
3139 }
3140
3141 if (MaxFDLimit) {
3142 // set the number of file descriptors to max. print out error
3143 // if getrlimit/setrlimit fails but continue regardless.
3144 struct rlimit nbr_files;
3145 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3146 if (status != 0) {
3147 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3148 } else {
3149 nbr_files.rlim_cur = nbr_files.rlim_max;
3150
3151 #ifdef __APPLE__
3152 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3153 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3154 // be used instead
3155 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3156 #endif
3157
3158 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3159 if (status != 0) {
3160 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3161 }
3162 }
3163 }
3164
3165 // at-exit methods are called in the reverse order of their registration.
3166 // atexit functions are called on return from main or as a result of a
3167 // call to exit(3C). There can be only 32 of these functions registered
3168 // and atexit() does not set errno.
3169
3170 if (PerfAllowAtExitRegistration) {
3171 // only register atexit functions if PerfAllowAtExitRegistration is set.
3172 // atexit functions can be delayed until process exit time, which
3173 // can be problematic for embedded VM situations. Embedded VMs should
3174 // call DestroyJavaVM() to assure that VM resources are released.
3175
3176 // note: perfMemory_exit_helper atexit function may be removed in
3177 // the future if the appropriate cleanup code can be added to the
3178 // VM_Exit VMOperation's doit method.
3179 if (atexit(perfMemory_exit_helper) != 0) {
3180 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3181 }
3182 }
3183
3184 // initialize thread priority policy
3185 prio_init();
3186
3187 #ifdef __APPLE__
3188 // dynamically link to objective c gc registration
3189 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3190 if (handleLibObjc != NULL) {
3191 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3192 }
3193 #endif
3194
3195 return JNI_OK;
3196 }
3197
3198 // Mark the polling page as unreadable
3199 void os::make_polling_page_unreadable(void) {
3200 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3201 fatal("Could not disable polling page");
3202 }
3203 }
3204
3205 // Mark the polling page as readable
3206 void os::make_polling_page_readable(void) {
3207 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3208 fatal("Could not enable polling page");
3209 }
3210 }
3211
3212 int os::active_processor_count() {
3213 // User has overridden the number of active processors
3214 if (ActiveProcessorCount > 0) {
3215 log_trace(os)("active_processor_count: "
3216 "active processor count set by user : %d",
3217 ActiveProcessorCount);
3218 return ActiveProcessorCount;
3219 }
3220
3221 return _processor_count;
3222 }
3223
3224 #ifdef __APPLE__
3225 static volatile int* volatile apic_to_processor_mapping = NULL;
3226 static volatile int next_processor_id = 0;
3227
3228 static inline volatile int* get_apic_to_processor_mapping() {
3229 volatile int* mapping = Atomic::load_acquire(&apic_to_processor_mapping);
3230 if (mapping == NULL) {
3231 // Calculate possible number space for APIC ids. This space is not necessarily
3232 // in the range [0, number_of_processors).
3233 uint total_bits = 0;
3234 for (uint i = 0;; ++i) {
3235 uint eax = 0xb; // Query topology leaf
3236 uint ebx;
3237 uint ecx = i;
3238 uint edx;
3239
3240 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3241
3242 uint level_type = (ecx >> 8) & 0xFF;
3243 if (level_type == 0) {
3244 // Invalid level; end of topology
3245 break;
3246 }
3247 uint level_apic_id_shift = eax & ((1u << 5) - 1);
3248 total_bits += level_apic_id_shift;
3249 }
3250
3251 uint max_apic_ids = 1u << total_bits;
3252 mapping = NEW_C_HEAP_ARRAY(int, max_apic_ids, mtInternal);
3253
3254 for (uint i = 0; i < max_apic_ids; ++i) {
3255 mapping[i] = -1;
3256 }
3257
3258 if (!Atomic::replace_if_null(&apic_to_processor_mapping, mapping)) {
3259 FREE_C_HEAP_ARRAY(int, mapping);
3260 mapping = Atomic::load_acquire(&apic_to_processor_mapping);
3261 }
3262 }
3263
3264 return mapping;
3265 }
3266
3267 uint os::processor_id() {
3268 volatile int* mapping = get_apic_to_processor_mapping();
3269
3270 uint eax = 0xb;
3271 uint ebx;
3272 uint ecx = 0;
3273 uint edx;
3274
3275 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3276
3277 // Map from APIC id to a unique logical processor ID in the expected
3278 // [0, num_processors) range.
3279
3280 uint apic_id = edx;
3281 int processor_id = Atomic::load(&mapping[apic_id]);
3282
3283 while (processor_id < 0) {
3284 if (Atomic::cmpxchg(&mapping[apic_id], -1, -2) == -1) {
3285 Atomic::store(&mapping[apic_id], Atomic::add(&next_processor_id, 1) - 1);
3286 }
3287 processor_id = Atomic::load(&mapping[apic_id]);
3288 }
3289
3290 assert(processor_id >= 0 && processor_id < os::processor_count(), "invalid processor id");
3291
3292 return (uint)processor_id;
3293 }
3294 #endif
3295
3296 void os::set_native_thread_name(const char *name) {
3297 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3298 // This is only supported in Snow Leopard and beyond
3299 if (name != NULL) {
3300 // Add a "Java: " prefix to the name
3301 char buf[MAXTHREADNAMESIZE];
3302 snprintf(buf, sizeof(buf), "Java: %s", name);
3303 pthread_setname_np(buf);
3304 }
3305 #endif
3306 }
3307
3308 bool os::bind_to_processor(uint processor_id) {
3309 // Not yet implemented.
3310 return false;
3311 }
3312
3313 void os::SuspendedThreadTask::internal_do_task() {
3314 if (do_suspend(_thread->osthread())) {
3315 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3316 do_task(context);
3317 do_resume(_thread->osthread());
3318 }
3319 }
3320
3321 ////////////////////////////////////////////////////////////////////////////////
3322 // debug support
3323
3324 bool os::find(address addr, outputStream* st) {
3325 Dl_info dlinfo;
3326 memset(&dlinfo, 0, sizeof(dlinfo));
3327 if (dladdr(addr, &dlinfo) != 0) {
3328 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3329 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3330 st->print("%s+%#x", dlinfo.dli_sname,
3331 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3332 } else if (dlinfo.dli_fbase != NULL) {
3333 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3334 } else {
3335 st->print("<absolute address>");
3336 }
3337 if (dlinfo.dli_fname != NULL) {
3338 st->print(" in %s", dlinfo.dli_fname);
3339 }
3340 if (dlinfo.dli_fbase != NULL) {
3341 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3342 }
3343 st->cr();
3344
3345 if (Verbose) {
3346 // decode some bytes around the PC
3347 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3348 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3349 address lowest = (address) dlinfo.dli_sname;
3350 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3351 if (begin < lowest) begin = lowest;
3352 Dl_info dlinfo2;
3353 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3354 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3355 end = (address) dlinfo2.dli_saddr;
3356 }
3357 Disassembler::decode(begin, end, st);
3358 }
3359 return true;
3360 }
3361 return false;
3362 }
3363
3364 ////////////////////////////////////////////////////////////////////////////////
3365 // misc
3366
3367 // This does not do anything on Bsd. This is basically a hook for being
3368 // able to use structured exception handling (thread-local exception filters)
3369 // on, e.g., Win32.
3370 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3371 const methodHandle& method, JavaCallArguments* args,
3372 Thread* thread) {
3373 f(value, method, args, thread);
3374 }
3375
3376 void os::print_statistics() {
3377 }
3378
3379 bool os::message_box(const char* title, const char* message) {
3380 int i;
3381 fdStream err(defaultStream::error_fd());
3382 for (i = 0; i < 78; i++) err.print_raw("=");
3383 err.cr();
3384 err.print_raw_cr(title);
3385 for (i = 0; i < 78; i++) err.print_raw("-");
3386 err.cr();
3387 err.print_raw_cr(message);
3388 for (i = 0; i < 78; i++) err.print_raw("=");
3389 err.cr();
3390
3391 char buf[16];
3392 // Prevent process from exiting upon "read error" without consuming all CPU
3393 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3394
3395 return buf[0] == 'y' || buf[0] == 'Y';
3396 }
3397
3398 static inline struct timespec get_mtime(const char* filename) {
3399 struct stat st;
3400 int ret = os::stat(filename, &st);
3401 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3402 #ifdef __APPLE__
3403 return st.st_mtimespec;
3404 #else
3405 return st.st_mtim;
3406 #endif
3407 }
3408
3409 int os::compare_file_modified_times(const char* file1, const char* file2) {
3410 struct timespec filetime1 = get_mtime(file1);
3411 struct timespec filetime2 = get_mtime(file2);
3412 int diff = filetime1.tv_sec - filetime2.tv_sec;
3413 if (diff == 0) {
3414 return filetime1.tv_nsec - filetime2.tv_nsec;
3415 }
3416 return diff;
3417 }
3418
3419 // Is a (classpath) directory empty?
3420 bool os::dir_is_empty(const char* path) {
3421 DIR *dir = NULL;
3422 struct dirent *ptr;
3423
3424 dir = opendir(path);
3425 if (dir == NULL) return true;
3426
3427 // Scan the directory
3428 bool result = true;
3429 while (result && (ptr = readdir(dir)) != NULL) {
3430 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3431 result = false;
3432 }
3433 }
3434 closedir(dir);
3435 return result;
3436 }
3437
3438 // This code originates from JDK's sysOpen and open64_w
3439 // from src/solaris/hpi/src/system_md.c
3440
3441 int os::open(const char *path, int oflag, int mode) {
3442 if (strlen(path) > MAX_PATH - 1) {
3443 errno = ENAMETOOLONG;
3444 return -1;
3445 }
3446 int fd;
3447
3448 fd = ::open(path, oflag, mode);
3449 if (fd == -1) return -1;
3450
3451 // If the open succeeded, the file might still be a directory
3452 {
3453 struct stat buf;
3454 int ret = ::fstat(fd, &buf);
3455 int st_mode = buf.st_mode;
3456
3457 if (ret != -1) {
3458 if ((st_mode & S_IFMT) == S_IFDIR) {
3459 errno = EISDIR;
3460 ::close(fd);
3461 return -1;
3462 }
3463 } else {
3464 ::close(fd);
3465 return -1;
3466 }
3467 }
3468
3469 // All file descriptors that are opened in the JVM and not
3470 // specifically destined for a subprocess should have the
3471 // close-on-exec flag set. If we don't set it, then careless 3rd
3472 // party native code might fork and exec without closing all
3473 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3474 // UNIXProcess.c), and this in turn might:
3475 //
3476 // - cause end-of-file to fail to be detected on some file
3477 // descriptors, resulting in mysterious hangs, or
3478 //
3479 // - might cause an fopen in the subprocess to fail on a system
3480 // suffering from bug 1085341.
3481 //
3482 // (Yes, the default setting of the close-on-exec flag is a Unix
3483 // design flaw)
3484 //
3485 // See:
3486 // 1085341: 32-bit stdio routines should support file descriptors >255
3487 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3488 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3489 //
3490 #ifdef FD_CLOEXEC
3491 {
3492 int flags = ::fcntl(fd, F_GETFD);
3493 if (flags != -1) {
3494 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3495 }
3496 }
3497 #endif
3498
3499 return fd;
3500 }
3501
3502
3503 // create binary file, rewriting existing file if required
3504 int os::create_binary_file(const char* path, bool rewrite_existing) {
3505 int oflags = O_WRONLY | O_CREAT;
3506 if (!rewrite_existing) {
3507 oflags |= O_EXCL;
3508 }
3509 return ::open(path, oflags, S_IREAD | S_IWRITE);
3510 }
3511
3512 // return current position of file pointer
3513 jlong os::current_file_offset(int fd) {
3514 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3515 }
3516
3517 // move file pointer to the specified offset
3518 jlong os::seek_to_file_offset(int fd, jlong offset) {
3519 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3520 }
3521
3522 // This code originates from JDK's sysAvailable
3523 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3524
3525 int os::available(int fd, jlong *bytes) {
3526 jlong cur, end;
3527 int mode;
3528 struct stat buf;
3529
3530 if (::fstat(fd, &buf) >= 0) {
3531 mode = buf.st_mode;
3532 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3533 int n;
3534 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3535 *bytes = n;
3536 return 1;
3537 }
3538 }
3539 }
3540 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3541 return 0;
3542 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3543 return 0;
3544 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3545 return 0;
3546 }
3547 *bytes = end - cur;
3548 return 1;
3549 }
3550
3551 // Map a block of memory.
3552 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3553 char *addr, size_t bytes, bool read_only,
3554 bool allow_exec) {
3555 int prot;
3556 int flags;
3557
3558 if (read_only) {
3559 prot = PROT_READ;
3560 flags = MAP_SHARED;
3561 } else {
3562 prot = PROT_READ | PROT_WRITE;
3563 flags = MAP_PRIVATE;
3564 }
3565
3566 if (allow_exec) {
3567 prot |= PROT_EXEC;
3568 }
3569
3570 if (addr != NULL) {
3571 flags |= MAP_FIXED;
3572 }
3573
3574 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3575 fd, file_offset);
3576 if (mapped_address == MAP_FAILED) {
3577 return NULL;
3578 }
3579 return mapped_address;
3580 }
3581
3582
3583 // Remap a block of memory.
3584 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3585 char *addr, size_t bytes, bool read_only,
3586 bool allow_exec) {
3587 // same as map_memory() on this OS
3588 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3589 allow_exec);
3590 }
3591
3592
3593 // Unmap a block of memory.
3594 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3595 return munmap(addr, bytes) == 0;
3596 }
3597
3598 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3599 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3600 // of a thread.
3601 //
3602 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3603 // the fast estimate available on the platform.
3604
3605 jlong os::current_thread_cpu_time() {
3606 #ifdef __APPLE__
3607 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3608 #else
3609 Unimplemented();
3610 return 0;
3611 #endif
3612 }
3613
3614 jlong os::thread_cpu_time(Thread* thread) {
3615 #ifdef __APPLE__
3616 return os::thread_cpu_time(thread, true /* user + sys */);
3617 #else
3618 Unimplemented();
3619 return 0;
3620 #endif
3621 }
3622
3623 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3624 #ifdef __APPLE__
3625 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3626 #else
3627 Unimplemented();
3628 return 0;
3629 #endif
3630 }
3631
3632 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3633 #ifdef __APPLE__
3634 struct thread_basic_info tinfo;
3635 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3636 kern_return_t kr;
3637 thread_t mach_thread;
3638
3639 mach_thread = thread->osthread()->thread_id();
3640 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3641 if (kr != KERN_SUCCESS) {
3642 return -1;
3643 }
3644
3645 if (user_sys_cpu_time) {
3646 jlong nanos;
3647 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3648 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3649 return nanos;
3650 } else {
3651 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3652 }
3653 #else
3654 Unimplemented();
3655 return 0;
3656 #endif
3657 }
3658
3659
3660 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3661 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3662 info_ptr->may_skip_backward = false; // elapsed time not wall time
3663 info_ptr->may_skip_forward = false; // elapsed time not wall time
3664 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3665 }
3666
3667 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3668 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3669 info_ptr->may_skip_backward = false; // elapsed time not wall time
3670 info_ptr->may_skip_forward = false; // elapsed time not wall time
3671 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3672 }
3673
3674 bool os::is_thread_cpu_time_supported() {
3675 #ifdef __APPLE__
3676 return true;
3677 #else
3678 return false;
3679 #endif
3680 }
3681
3682 // System loadavg support. Returns -1 if load average cannot be obtained.
3683 // Bsd doesn't yet have a (official) notion of processor sets,
3684 // so just return the system wide load average.
3685 int os::loadavg(double loadavg[], int nelem) {
3686 return ::getloadavg(loadavg, nelem);
3687 }
3688
3689 void os::pause() {
3690 char filename[MAX_PATH];
3691 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3692 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
3693 } else {
3694 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3695 }
3696
3697 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3698 if (fd != -1) {
3699 struct stat buf;
3700 ::close(fd);
3701 while (::stat(filename, &buf) == 0) {
3702 (void)::poll(NULL, 0, 100);
3703 }
3704 } else {
3705 jio_fprintf(stderr,
3706 "Could not open pause file '%s', continuing immediately.\n", filename);
3707 }
3708 }
3709
3710 // Darwin has no "environ" in a dynamic library.
3711 #ifdef __APPLE__
3712 #include <crt_externs.h>
3713 #define environ (*_NSGetEnviron())
3714 #else
3715 extern char** environ;
3716 #endif
3717
3718 // Run the specified command in a separate process. Return its exit value,
3719 // or -1 on failure (e.g. can't fork a new process).
3720 // Unlike system(), this function can be called from signal handler. It
3721 // doesn't block SIGINT et al.
3722 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3723 const char * argv[4] = {"sh", "-c", cmd, NULL};
3724
3725 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3726 // pthread_atfork handlers and reset pthread library. All we need is a
3727 // separate process to execve. Make a direct syscall to fork process.
3728 // On IA64 there's no fork syscall, we have to use fork() and hope for
3729 // the best...
3730 pid_t pid = fork();
3731
3732 if (pid < 0) {
3733 // fork failed
3734 return -1;
3735
3736 } else if (pid == 0) {
3737 // child process
3738
3739 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3740 // first to kill every thread on the thread list. Because this list is
3741 // not reset by fork() (see notes above), execve() will instead kill
3742 // every thread in the parent process. We know this is the only thread
3743 // in the new process, so make a system call directly.
3744 // IA64 should use normal execve() from glibc to match the glibc fork()
3745 // above.
3746 execve("/bin/sh", (char* const*)argv, environ);
3747
3748 // execve failed
3749 _exit(-1);
3750
3751 } else {
3752 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3753 // care about the actual exit code, for now.
3754
3755 int status;
3756
3757 // Wait for the child process to exit. This returns immediately if
3758 // the child has already exited. */
3759 while (waitpid(pid, &status, 0) < 0) {
3760 switch (errno) {
3761 case ECHILD: return 0;
3762 case EINTR: break;
3763 default: return -1;
3764 }
3765 }
3766
3767 if (WIFEXITED(status)) {
3768 // The child exited normally; get its exit code.
3769 return WEXITSTATUS(status);
3770 } else if (WIFSIGNALED(status)) {
3771 // The child exited because of a signal
3772 // The best value to return is 0x80 + signal number,
3773 // because that is what all Unix shells do, and because
3774 // it allows callers to distinguish between process exit and
3775 // process death by signal.
3776 return 0x80 + WTERMSIG(status);
3777 } else {
3778 // Unknown exit code; pass it through
3779 return status;
3780 }
3781 }
3782 }
3783
3784 // Get the kern.corefile setting, or otherwise the default path to the core file
3785 // Returns the length of the string
3786 int os::get_core_path(char* buffer, size_t bufferSize) {
3787 int n = 0;
3788 #ifdef __APPLE__
3789 char coreinfo[MAX_PATH];
3790 size_t sz = sizeof(coreinfo);
3791 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0);
3792 if (ret == 0) {
3793 char *pid_pos = strstr(coreinfo, "%P");
3794 // skip over the "%P" to preserve any optional custom user pattern
3795 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : "";
3796
3797 if (pid_pos != NULL) {
3798 *pid_pos = '\0';
3799 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail);
3800 } else {
3801 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo);
3802 }
3803 } else
3804 #endif
3805 {
3806 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id());
3807 }
3808 // Truncate if theoretical string was longer than bufferSize
3809 n = MIN2(n, (int)bufferSize);
3810
3811 return n;
3812 }
3813
3814 bool os::supports_map_sync() {
3815 return false;
3816 }
3817
3818 #ifndef PRODUCT
3819 void TestReserveMemorySpecial_test() {
3820 // No tests available for this platform
3821 }
3822 #endif
3823
3824 bool os::start_debugging(char *buf, int buflen) {
3825 int len = (int)strlen(buf);
3826 char *p = &buf[len];
3827
3828 jio_snprintf(p, buflen-len,
3829 "\n\n"
3830 "Do you want to debug the problem?\n\n"
3831 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3832 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3833 "Otherwise, press RETURN to abort...",
3834 os::current_process_id(), os::current_process_id(),
3835 os::current_thread_id(), os::current_thread_id());
3836
3837 bool yes = os::message_box("Unexpected Error", buf);
3838
3839 if (yes) {
3840 // yes, user asked VM to launch debugger
3841 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3842 os::current_process_id(), os::current_process_id());
3843
3844 os::fork_and_exec(buf);
3845 yes = false;
3846 }
3847 return yes;
3848 }