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 #ifdef __APPLE__
145 static const int processor_id_unassigned = -1;
146 static const int processor_id_assigning = -2;
147 static const int processor_id_map_size = 256;
148 static volatile int processor_id_map[processor_id_map_size];
149 static volatile int processor_id_next = 0;
150 #endif
151
152 ////////////////////////////////////////////////////////////////////////////////
153 // utility functions
154
155 static int SR_initialize();
156
157 julong os::available_memory() {
158 return Bsd::available_memory();
159 }
160
161 // available here means free
162 julong os::Bsd::available_memory() {
163 uint64_t available = physical_memory() >> 2;
164 #ifdef __APPLE__
165 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
166 vm_statistics64_data_t vmstat;
167 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
168 (host_info64_t)&vmstat, &count);
169 assert(kerr == KERN_SUCCESS,
170 "host_statistics64 failed - check mach_host_self() and count");
171 if (kerr == KERN_SUCCESS) {
172 available = vmstat.free_count * os::vm_page_size();
173 }
174 #endif
175 return available;
176 }
177
178 // for more info see :
179 // https://man.openbsd.org/sysctl.2
180 void os::Bsd::print_uptime_info(outputStream* st) {
181 struct timeval boottime;
182 size_t len = sizeof(boottime);
183 int mib[2];
184 mib[0] = CTL_KERN;
185 mib[1] = KERN_BOOTTIME;
186
187 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
188 time_t bootsec = boottime.tv_sec;
189 time_t currsec = time(NULL);
190 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
191 }
192 }
193
194 julong os::physical_memory() {
195 return Bsd::physical_memory();
196 }
197
198 // Return true if user is running as root.
199
200 bool os::have_special_privileges() {
201 static bool init = false;
202 static bool privileges = false;
203 if (!init) {
204 privileges = (getuid() != geteuid()) || (getgid() != getegid());
205 init = true;
206 }
207 return privileges;
208 }
209
210
211
212 // Cpu architecture string
213 #if defined(ZERO)
214 static char cpu_arch[] = ZERO_LIBARCH;
215 #elif defined(IA64)
216 static char cpu_arch[] = "ia64";
217 #elif defined(IA32)
218 static char cpu_arch[] = "i386";
219 #elif defined(AMD64)
220 static char cpu_arch[] = "amd64";
221 #elif defined(ARM)
222 static char cpu_arch[] = "arm";
223 #elif defined(PPC32)
224 static char cpu_arch[] = "ppc";
225 #elif defined(SPARC)
226 #ifdef _LP64
227 static char cpu_arch[] = "sparcv9";
228 #else
229 static char cpu_arch[] = "sparc";
230 #endif
231 #else
232 #error Add appropriate cpu_arch setting
233 #endif
234
235 // Compiler variant
236 #ifdef COMPILER2
237 #define COMPILER_VARIANT "server"
238 #else
239 #define COMPILER_VARIANT "client"
240 #endif
241
242
243 void os::Bsd::initialize_system_info() {
244 int mib[2];
245 size_t len;
246 int cpu_val;
247 julong mem_val;
248
249 // get processors count via hw.ncpus sysctl
250 mib[0] = CTL_HW;
251 mib[1] = HW_NCPU;
252 len = sizeof(cpu_val);
253 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
254 assert(len == sizeof(cpu_val), "unexpected data size");
255 set_processor_count(cpu_val);
256 } else {
257 set_processor_count(1); // fallback
258 }
259
260 #ifdef __APPLE__
261 // initialize processor id map
262 for (int i = 0; i < processor_id_map_size; i++) {
263 processor_id_map[i] = processor_id_unassigned;
264 }
265 #endif
266
267 // get physical memory via hw.memsize sysctl (hw.memsize is used
268 // since it returns a 64 bit value)
269 mib[0] = CTL_HW;
270
271 #if defined (HW_MEMSIZE) // Apple
272 mib[1] = HW_MEMSIZE;
273 #elif defined(HW_PHYSMEM) // Most of BSD
274 mib[1] = HW_PHYSMEM;
275 #elif defined(HW_REALMEM) // Old FreeBSD
276 mib[1] = HW_REALMEM;
277 #else
278 #error No ways to get physmem
279 #endif
280
281 len = sizeof(mem_val);
282 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
283 assert(len == sizeof(mem_val), "unexpected data size");
284 _physical_memory = mem_val;
285 } else {
286 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
287 }
288
289 #ifdef __OpenBSD__
290 {
291 // limit _physical_memory memory view on OpenBSD since
292 // datasize rlimit restricts us anyway.
293 struct rlimit limits;
294 getrlimit(RLIMIT_DATA, &limits);
295 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
296 }
297 #endif
298 }
299
300 #ifdef __APPLE__
301 static const char *get_home() {
302 const char *home_dir = ::getenv("HOME");
303 if ((home_dir == NULL) || (*home_dir == '\0')) {
304 struct passwd *passwd_info = getpwuid(geteuid());
305 if (passwd_info != NULL) {
306 home_dir = passwd_info->pw_dir;
307 }
308 }
309
310 return home_dir;
311 }
312 #endif
313
314 void os::init_system_properties_values() {
315 // The next steps are taken in the product version:
316 //
317 // Obtain the JAVA_HOME value from the location of libjvm.so.
318 // This library should be located at:
319 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
320 //
321 // If "/jre/lib/" appears at the right place in the path, then we
322 // assume libjvm.so is installed in a JDK and we use this path.
323 //
324 // Otherwise exit with message: "Could not create the Java virtual machine."
325 //
326 // The following extra steps are taken in the debugging version:
327 //
328 // If "/jre/lib/" does NOT appear at the right place in the path
329 // instead of exit check for $JAVA_HOME environment variable.
330 //
331 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
332 // then we append a fake suffix "hotspot/libjvm.so" to this path so
333 // it looks like libjvm.so is installed there
334 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
335 //
336 // Otherwise exit.
337 //
338 // Important note: if the location of libjvm.so changes this
339 // code needs to be changed accordingly.
340
341 // See ld(1):
342 // The linker uses the following search paths to locate required
343 // shared libraries:
344 // 1: ...
345 // ...
346 // 7: The default directories, normally /lib and /usr/lib.
347 #ifndef DEFAULT_LIBPATH
348 #ifndef OVERRIDE_LIBPATH
349 #define DEFAULT_LIBPATH "/lib:/usr/lib"
350 #else
351 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
352 #endif
353 #endif
354
355 // Base path of extensions installed on the system.
356 #define SYS_EXT_DIR "/usr/java/packages"
357 #define EXTENSIONS_DIR "/lib/ext"
358
359 #ifndef __APPLE__
360
361 // Buffer that fits several sprintfs.
362 // Note that the space for the colon and the trailing null are provided
363 // by the nulls included by the sizeof operator.
364 const size_t bufsize =
365 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
366 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
367 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
368
369 // sysclasspath, java_home, dll_dir
370 {
371 char *pslash;
372 os::jvm_path(buf, bufsize);
373
374 // Found the full path to libjvm.so.
375 // Now cut the path to <java_home>/jre if we can.
376 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
377 pslash = strrchr(buf, '/');
378 if (pslash != NULL) {
379 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
380 }
381 Arguments::set_dll_dir(buf);
382
383 if (pslash != NULL) {
384 pslash = strrchr(buf, '/');
385 if (pslash != NULL) {
386 *pslash = '\0'; // Get rid of /<arch>.
387 pslash = strrchr(buf, '/');
388 if (pslash != NULL) {
389 *pslash = '\0'; // Get rid of /lib.
390 }
391 }
392 }
393 Arguments::set_java_home(buf);
394 if (!set_boot_path('/', ':')) {
395 vm_exit_during_initialization("Failed setting boot class path.", NULL);
396 }
397 }
398
399 // Where to look for native libraries.
400 //
401 // Note: Due to a legacy implementation, most of the library path
402 // is set in the launcher. This was to accomodate linking restrictions
403 // on legacy Bsd implementations (which are no longer supported).
404 // Eventually, all the library path setting will be done here.
405 //
406 // However, to prevent the proliferation of improperly built native
407 // libraries, the new path component /usr/java/packages is added here.
408 // Eventually, all the library path setting will be done here.
409 {
410 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
411 // should always exist (until the legacy problem cited above is
412 // addressed).
413 const char *v = ::getenv("LD_LIBRARY_PATH");
414 const char *v_colon = ":";
415 if (v == NULL) { v = ""; v_colon = ""; }
416 // That's +1 for the colon and +1 for the trailing '\0'.
417 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
418 strlen(v) + 1 +
419 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
420 mtInternal);
421 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
422 Arguments::set_library_path(ld_library_path);
423 FREE_C_HEAP_ARRAY(char, ld_library_path);
424 }
425
426 // Extensions directories.
427 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
428 Arguments::set_ext_dirs(buf);
429
430 FREE_C_HEAP_ARRAY(char, buf);
431
432 #else // __APPLE__
433
434 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
435 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
436
437 const char *user_home_dir = get_home();
438 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
439 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
440 sizeof(SYS_EXTENSIONS_DIRS);
441
442 // Buffer that fits several sprintfs.
443 // Note that the space for the colon and the trailing null are provided
444 // by the nulls included by the sizeof operator.
445 const size_t bufsize =
446 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
447 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
448 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
449
450 // sysclasspath, java_home, dll_dir
451 {
452 char *pslash;
453 os::jvm_path(buf, bufsize);
454
455 // Found the full path to libjvm.so.
456 // Now cut the path to <java_home>/jre if we can.
457 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
458 pslash = strrchr(buf, '/');
459 if (pslash != NULL) {
460 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
461 }
462 #ifdef STATIC_BUILD
463 strcat(buf, "/lib");
464 #endif
465
466 Arguments::set_dll_dir(buf);
467
468 if (pslash != NULL) {
469 pslash = strrchr(buf, '/');
470 if (pslash != NULL) {
471 *pslash = '\0'; // Get rid of /lib.
472 }
473 }
474 Arguments::set_java_home(buf);
475 set_boot_path('/', ':');
476 }
477
478 // Where to look for native libraries.
479 //
480 // Note: Due to a legacy implementation, most of the library path
481 // is set in the launcher. This was to accomodate linking restrictions
482 // on legacy Bsd implementations (which are no longer supported).
483 // Eventually, all the library path setting will be done here.
484 //
485 // However, to prevent the proliferation of improperly built native
486 // libraries, the new path component /usr/java/packages is added here.
487 // Eventually, all the library path setting will be done here.
488 {
489 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
490 // should always exist (until the legacy problem cited above is
491 // addressed).
492 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
493 // can specify a directory inside an app wrapper
494 const char *l = ::getenv("JAVA_LIBRARY_PATH");
495 const char *l_colon = ":";
496 if (l == NULL) { l = ""; l_colon = ""; }
497
498 const char *v = ::getenv("DYLD_LIBRARY_PATH");
499 const char *v_colon = ":";
500 if (v == NULL) { v = ""; v_colon = ""; }
501
502 // Apple's Java6 has "." at the beginning of java.library.path.
503 // OpenJDK on Windows has "." at the end of java.library.path.
504 // OpenJDK on Linux and Solaris don't have "." in java.library.path
505 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
506 // "." is appended to the end of java.library.path. Yes, this
507 // could cause a change in behavior, but Apple's Java6 behavior
508 // can be achieved by putting "." at the beginning of the
509 // JAVA_LIBRARY_PATH environment variable.
510 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
511 strlen(v) + 1 + strlen(l) + 1 +
512 system_ext_size + 3,
513 mtInternal);
514 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
515 v, v_colon, l, l_colon, user_home_dir);
516 Arguments::set_library_path(ld_library_path);
517 FREE_C_HEAP_ARRAY(char, ld_library_path);
518 }
519
520 // Extensions directories.
521 //
522 // Note that the space for the colon and the trailing null are provided
523 // by the nulls included by the sizeof operator (so actually one byte more
524 // than necessary is allocated).
525 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
526 user_home_dir, Arguments::get_java_home());
527 Arguments::set_ext_dirs(buf);
528
529 FREE_C_HEAP_ARRAY(char, buf);
530
531 #undef SYS_EXTENSIONS_DIR
532 #undef SYS_EXTENSIONS_DIRS
533
534 #endif // __APPLE__
535
536 #undef SYS_EXT_DIR
537 #undef EXTENSIONS_DIR
538 }
539
540 ////////////////////////////////////////////////////////////////////////////////
541 // breakpoint support
542
543 void os::breakpoint() {
544 BREAKPOINT;
545 }
546
547 extern "C" void breakpoint() {
548 // use debugger to set breakpoint here
549 }
550
551 ////////////////////////////////////////////////////////////////////////////////
552 // signal support
553
554 debug_only(static bool signal_sets_initialized = false);
555 static sigset_t unblocked_sigs, vm_sigs;
556
557 void os::Bsd::signal_sets_init() {
558 // Should also have an assertion stating we are still single-threaded.
559 assert(!signal_sets_initialized, "Already initialized");
560 // Fill in signals that are necessarily unblocked for all threads in
561 // the VM. Currently, we unblock the following signals:
562 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
563 // by -Xrs (=ReduceSignalUsage));
564 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
565 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
566 // the dispositions or masks wrt these signals.
567 // Programs embedding the VM that want to use the above signals for their
568 // own purposes must, at this time, use the "-Xrs" option to prevent
569 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
570 // (See bug 4345157, and other related bugs).
571 // In reality, though, unblocking these signals is really a nop, since
572 // these signals are not blocked by default.
573 sigemptyset(&unblocked_sigs);
574 sigaddset(&unblocked_sigs, SIGILL);
575 sigaddset(&unblocked_sigs, SIGSEGV);
576 sigaddset(&unblocked_sigs, SIGBUS);
577 sigaddset(&unblocked_sigs, SIGFPE);
578 sigaddset(&unblocked_sigs, SR_signum);
579
580 if (!ReduceSignalUsage) {
581 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
582 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
583
584 }
585 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
586 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
587 }
588 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
589 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
590 }
591 }
592 // Fill in signals that are blocked by all but the VM thread.
593 sigemptyset(&vm_sigs);
594 if (!ReduceSignalUsage) {
595 sigaddset(&vm_sigs, BREAK_SIGNAL);
596 }
597 debug_only(signal_sets_initialized = true);
598
599 }
600
601 // These are signals that are unblocked while a thread is running Java.
602 // (For some reason, they get blocked by default.)
603 sigset_t* os::Bsd::unblocked_signals() {
604 assert(signal_sets_initialized, "Not initialized");
605 return &unblocked_sigs;
606 }
607
608 // These are the signals that are blocked while a (non-VM) thread is
609 // running Java. Only the VM thread handles these signals.
610 sigset_t* os::Bsd::vm_signals() {
611 assert(signal_sets_initialized, "Not initialized");
612 return &vm_sigs;
613 }
614
615 void os::Bsd::hotspot_sigmask(Thread* thread) {
616
617 //Save caller's signal mask before setting VM signal mask
618 sigset_t caller_sigmask;
619 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
620
621 OSThread* osthread = thread->osthread();
622 osthread->set_caller_sigmask(caller_sigmask);
623
624 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
625
626 if (!ReduceSignalUsage) {
627 if (thread->is_VM_thread()) {
628 // Only the VM thread handles BREAK_SIGNAL ...
629 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
630 } else {
631 // ... all other threads block BREAK_SIGNAL
632 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
633 }
634 }
635 }
636
637
638 //////////////////////////////////////////////////////////////////////////////
639 // create new thread
640
641 #ifdef __APPLE__
642 // library handle for calling objc_registerThreadWithCollector()
643 // without static linking to the libobjc library
644 #define OBJC_LIB "/usr/lib/libobjc.dylib"
645 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
646 typedef void (*objc_registerThreadWithCollector_t)();
647 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
648 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
649 #endif
650
651 #ifdef __APPLE__
652 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
653 // Additional thread_id used to correlate threads in SA
654 thread_identifier_info_data_t m_ident_info;
655 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
656
657 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
658 (thread_info_t) &m_ident_info, &count);
659
660 return m_ident_info.thread_id;
661 }
662 #endif
663
664 // Thread start routine for all newly created threads
665 static void *thread_native_entry(Thread *thread) {
666
667 thread->record_stack_base_and_size();
668
669 // Try to randomize the cache line index of hot stack frames.
670 // This helps when threads of the same stack traces evict each other's
671 // cache lines. The threads can be either from the same JVM instance, or
672 // from different JVM instances. The benefit is especially true for
673 // processors with hyperthreading technology.
674 static int counter = 0;
675 int pid = os::current_process_id();
676 alloca(((pid ^ counter++) & 7) * 128);
677
678 thread->initialize_thread_current();
679
680 OSThread* osthread = thread->osthread();
681 Monitor* sync = osthread->startThread_lock();
682
683 osthread->set_thread_id(os::Bsd::gettid());
684
685 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
686 os::current_thread_id(), (uintx) pthread_self());
687
688 #ifdef __APPLE__
689 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
690 guarantee(unique_thread_id != 0, "unique thread id was not found");
691 osthread->set_unique_thread_id(unique_thread_id);
692 #endif
693 // initialize signal mask for this thread
694 os::Bsd::hotspot_sigmask(thread);
695
696 // initialize floating point control register
697 os::Bsd::init_thread_fpu_state();
698
699 #ifdef __APPLE__
700 // register thread with objc gc
701 if (objc_registerThreadWithCollectorFunction != NULL) {
702 objc_registerThreadWithCollectorFunction();
703 }
704 #endif
705
706 // handshaking with parent thread
707 {
708 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
709
710 // notify parent thread
711 osthread->set_state(INITIALIZED);
712 sync->notify_all();
713
714 // wait until os::start_thread()
715 while (osthread->get_state() == INITIALIZED) {
716 sync->wait_without_safepoint_check();
717 }
718 }
719
720 // call one more level start routine
721 thread->call_run();
722
723 // Note: at this point the thread object may already have deleted itself.
724 // Prevent dereferencing it from here on out.
725 thread = NULL;
726
727 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
728 os::current_thread_id(), (uintx) pthread_self());
729
730 return 0;
731 }
732
733 bool os::create_thread(Thread* thread, ThreadType thr_type,
734 size_t req_stack_size) {
735 assert(thread->osthread() == NULL, "caller responsible");
736
737 // Allocate the OSThread object
738 OSThread* osthread = new OSThread(NULL, NULL);
739 if (osthread == NULL) {
740 return false;
741 }
742
743 // set the correct thread state
744 osthread->set_thread_type(thr_type);
745
746 // Initial state is ALLOCATED but not INITIALIZED
747 osthread->set_state(ALLOCATED);
748
749 thread->set_osthread(osthread);
750
751 // init thread attributes
752 pthread_attr_t attr;
753 pthread_attr_init(&attr);
754 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
755
756 // calculate stack size if it's not specified by caller
757 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
758 int status = pthread_attr_setstacksize(&attr, stack_size);
759 assert_status(status == 0, status, "pthread_attr_setstacksize");
760
761 ThreadState state;
762
763 {
764 pthread_t tid;
765 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
766
767 char buf[64];
768 if (ret == 0) {
769 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
770 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
771 } else {
772 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
773 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
774 // Log some OS information which might explain why creating the thread failed.
775 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
776 LogStream st(Log(os, thread)::info());
777 os::Posix::print_rlimit_info(&st);
778 os::print_memory_info(&st);
779 }
780
781 pthread_attr_destroy(&attr);
782
783 if (ret != 0) {
784 // Need to clean up stuff we've allocated so far
785 thread->set_osthread(NULL);
786 delete osthread;
787 return false;
788 }
789
790 // Store pthread info into the OSThread
791 osthread->set_pthread_id(tid);
792
793 // Wait until child thread is either initialized or aborted
794 {
795 Monitor* sync_with_child = osthread->startThread_lock();
796 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
797 while ((state = osthread->get_state()) == ALLOCATED) {
798 sync_with_child->wait_without_safepoint_check();
799 }
800 }
801
802 }
803
804 // Aborted due to thread limit being reached
805 if (state == ZOMBIE) {
806 thread->set_osthread(NULL);
807 delete osthread;
808 return false;
809 }
810
811 // The thread is returned suspended (in state INITIALIZED),
812 // and is started higher up in the call chain
813 assert(state == INITIALIZED, "race condition");
814 return true;
815 }
816
817 /////////////////////////////////////////////////////////////////////////////
818 // attach existing thread
819
820 // bootstrap the main thread
821 bool os::create_main_thread(JavaThread* thread) {
822 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
823 return create_attached_thread(thread);
824 }
825
826 bool os::create_attached_thread(JavaThread* thread) {
827 #ifdef ASSERT
828 thread->verify_not_published();
829 #endif
830
831 // Allocate the OSThread object
832 OSThread* osthread = new OSThread(NULL, NULL);
833
834 if (osthread == NULL) {
835 return false;
836 }
837
838 osthread->set_thread_id(os::Bsd::gettid());
839
840 // Store pthread info into the OSThread
841 #ifdef __APPLE__
842 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
843 guarantee(unique_thread_id != 0, "just checking");
844 osthread->set_unique_thread_id(unique_thread_id);
845 #endif
846 osthread->set_pthread_id(::pthread_self());
847
848 // initialize floating point control register
849 os::Bsd::init_thread_fpu_state();
850
851 // Initial thread state is RUNNABLE
852 osthread->set_state(RUNNABLE);
853
854 thread->set_osthread(osthread);
855
856 // initialize signal mask for this thread
857 // and save the caller's signal mask
858 os::Bsd::hotspot_sigmask(thread);
859
860 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
861 os::current_thread_id(), (uintx) pthread_self());
862
863 return true;
864 }
865
866 void os::pd_start_thread(Thread* thread) {
867 OSThread * osthread = thread->osthread();
868 assert(osthread->get_state() != INITIALIZED, "just checking");
869 Monitor* sync_with_child = osthread->startThread_lock();
870 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
871 sync_with_child->notify();
872 }
873
874 // Free Bsd resources related to the OSThread
875 void os::free_thread(OSThread* osthread) {
876 assert(osthread != NULL, "osthread not set");
877
878 // We are told to free resources of the argument thread,
879 // but we can only really operate on the current thread.
880 assert(Thread::current()->osthread() == osthread,
881 "os::free_thread but not current thread");
882
883 // Restore caller's signal mask
884 sigset_t sigmask = osthread->caller_sigmask();
885 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
886
887 delete osthread;
888 }
889
890 ////////////////////////////////////////////////////////////////////////////////
891 // time support
892
893 // Time since start-up in seconds to a fine granularity.
894 // Used by VMSelfDestructTimer and the MemProfiler.
895 double os::elapsedTime() {
896
897 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
898 }
899
900 jlong os::elapsed_counter() {
901 return javaTimeNanos() - initial_time_count;
902 }
903
904 jlong os::elapsed_frequency() {
905 return NANOSECS_PER_SEC; // nanosecond resolution
906 }
907
908 bool os::supports_vtime() { return true; }
909
910 double os::elapsedVTime() {
911 // better than nothing, but not much
912 return elapsedTime();
913 }
914
915 jlong os::javaTimeMillis() {
916 timeval time;
917 int status = gettimeofday(&time, NULL);
918 assert(status != -1, "bsd error");
919 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
920 }
921
922 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
923 timeval time;
924 int status = gettimeofday(&time, NULL);
925 assert(status != -1, "bsd error");
926 seconds = jlong(time.tv_sec);
927 nanos = jlong(time.tv_usec) * 1000;
928 }
929
930 #ifndef __APPLE__
931 #ifndef CLOCK_MONOTONIC
932 #define CLOCK_MONOTONIC (1)
933 #endif
934 #endif
935
936 #ifdef __APPLE__
937 void os::Bsd::clock_init() {
938 mach_timebase_info(&_timebase_info);
939 }
940 #else
941 void os::Bsd::clock_init() {
942 struct timespec res;
943 struct timespec tp;
944 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
945 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
946 // yes, monotonic clock is supported
947 _clock_gettime = ::clock_gettime;
948 }
949 }
950 #endif
951
952
953
954 #ifdef __APPLE__
955
956 jlong os::javaTimeNanos() {
957 const uint64_t tm = mach_absolute_time();
958 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
959 const uint64_t prev = Bsd::_max_abstime;
960 if (now <= prev) {
961 return prev; // same or retrograde time;
962 }
963 const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now);
964 assert(obsv >= prev, "invariant"); // Monotonicity
965 // If the CAS succeeded then we're done and return "now".
966 // If the CAS failed and the observed value "obsv" is >= now then
967 // we should return "obsv". If the CAS failed and now > obsv > prv then
968 // some other thread raced this thread and installed a new value, in which case
969 // we could either (a) retry the entire operation, (b) retry trying to install now
970 // or (c) just return obsv. We use (c). No loop is required although in some cases
971 // we might discard a higher "now" value in deference to a slightly lower but freshly
972 // installed obsv value. That's entirely benign -- it admits no new orderings compared
973 // to (a) or (b) -- and greatly reduces coherence traffic.
974 // We might also condition (c) on the magnitude of the delta between obsv and now.
975 // Avoiding excessive CAS operations to hot RW locations is critical.
976 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
977 return (prev == obsv) ? now : obsv;
978 }
979
980 #else // __APPLE__
981
982 jlong os::javaTimeNanos() {
983 if (os::supports_monotonic_clock()) {
984 struct timespec tp;
985 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
986 assert(status == 0, "gettime error");
987 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
988 return result;
989 } else {
990 timeval time;
991 int status = gettimeofday(&time, NULL);
992 assert(status != -1, "bsd error");
993 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
994 return 1000 * usecs;
995 }
996 }
997
998 #endif // __APPLE__
999
1000 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1001 if (os::supports_monotonic_clock()) {
1002 info_ptr->max_value = ALL_64_BITS;
1003
1004 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1005 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1006 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1007 } else {
1008 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1009 info_ptr->max_value = ALL_64_BITS;
1010
1011 // gettimeofday is a real time clock so it skips
1012 info_ptr->may_skip_backward = true;
1013 info_ptr->may_skip_forward = true;
1014 }
1015
1016 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1017 }
1018
1019 // Return the real, user, and system times in seconds from an
1020 // arbitrary fixed point in the past.
1021 bool os::getTimesSecs(double* process_real_time,
1022 double* process_user_time,
1023 double* process_system_time) {
1024 struct tms ticks;
1025 clock_t real_ticks = times(&ticks);
1026
1027 if (real_ticks == (clock_t) (-1)) {
1028 return false;
1029 } else {
1030 double ticks_per_second = (double) clock_tics_per_sec;
1031 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1032 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1033 *process_real_time = ((double) real_ticks) / ticks_per_second;
1034
1035 return true;
1036 }
1037 }
1038
1039
1040 char * os::local_time_string(char *buf, size_t buflen) {
1041 struct tm t;
1042 time_t long_time;
1043 time(&long_time);
1044 localtime_r(&long_time, &t);
1045 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1046 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1047 t.tm_hour, t.tm_min, t.tm_sec);
1048 return buf;
1049 }
1050
1051 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1052 return localtime_r(clock, res);
1053 }
1054
1055 ////////////////////////////////////////////////////////////////////////////////
1056 // runtime exit support
1057
1058 // Note: os::shutdown() might be called very early during initialization, or
1059 // called from signal handler. Before adding something to os::shutdown(), make
1060 // sure it is async-safe and can handle partially initialized VM.
1061 void os::shutdown() {
1062
1063 // allow PerfMemory to attempt cleanup of any persistent resources
1064 perfMemory_exit();
1065
1066 // needs to remove object in file system
1067 AttachListener::abort();
1068
1069 // flush buffered output, finish log files
1070 ostream_abort();
1071
1072 // Check for abort hook
1073 abort_hook_t abort_hook = Arguments::abort_hook();
1074 if (abort_hook != NULL) {
1075 abort_hook();
1076 }
1077
1078 }
1079
1080 // Note: os::abort() might be called very early during initialization, or
1081 // called from signal handler. Before adding something to os::abort(), make
1082 // sure it is async-safe and can handle partially initialized VM.
1083 void os::abort(bool dump_core, void* siginfo, const void* context) {
1084 os::shutdown();
1085 if (dump_core) {
1086 #ifndef PRODUCT
1087 fdStream out(defaultStream::output_fd());
1088 out.print_raw("Current thread is ");
1089 char buf[16];
1090 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1091 out.print_raw_cr(buf);
1092 out.print_raw_cr("Dumping core ...");
1093 #endif
1094 ::abort(); // dump core
1095 }
1096
1097 ::exit(1);
1098 }
1099
1100 // Die immediately, no exit hook, no abort hook, no cleanup.
1101 // Dump a core file, if possible, for debugging.
1102 void os::die() {
1103 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1104 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1105 // and don't take the time to generate a core file.
1106 os::signal_raise(SIGKILL);
1107 } else {
1108 // _exit() on BsdThreads only kills current thread
1109 ::abort();
1110 }
1111 }
1112
1113 // Information of current thread in variety of formats
1114 pid_t os::Bsd::gettid() {
1115 int retval = -1;
1116
1117 #ifdef __APPLE__ //XNU kernel
1118 // despite the fact mach port is actually not a thread id use it
1119 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1120 retval = ::pthread_mach_thread_np(::pthread_self());
1121 guarantee(retval != 0, "just checking");
1122 return retval;
1123
1124 #else
1125 #ifdef __FreeBSD__
1126 retval = syscall(SYS_thr_self);
1127 #else
1128 #ifdef __OpenBSD__
1129 retval = syscall(SYS_getthrid);
1130 #else
1131 #ifdef __NetBSD__
1132 retval = (pid_t) syscall(SYS__lwp_self);
1133 #endif
1134 #endif
1135 #endif
1136 #endif
1137
1138 if (retval == -1) {
1139 return getpid();
1140 }
1141 }
1142
1143 intx os::current_thread_id() {
1144 #ifdef __APPLE__
1145 return (intx)::pthread_mach_thread_np(::pthread_self());
1146 #else
1147 return (intx)::pthread_self();
1148 #endif
1149 }
1150
1151 int os::current_process_id() {
1152 return (int)(getpid());
1153 }
1154
1155 // DLL functions
1156
1157 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1158
1159 // This must be hard coded because it's the system's temporary
1160 // directory not the java application's temp directory, ala java.io.tmpdir.
1161 #ifdef __APPLE__
1162 // macosx has a secure per-user temporary directory
1163 char temp_path_storage[PATH_MAX];
1164 const char* os::get_temp_directory() {
1165 static char *temp_path = NULL;
1166 if (temp_path == NULL) {
1167 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1168 if (pathSize == 0 || pathSize > PATH_MAX) {
1169 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1170 }
1171 temp_path = temp_path_storage;
1172 }
1173 return temp_path;
1174 }
1175 #else // __APPLE__
1176 const char* os::get_temp_directory() { return "/tmp"; }
1177 #endif // __APPLE__
1178
1179 // check if addr is inside libjvm.so
1180 bool os::address_is_in_vm(address addr) {
1181 static address libjvm_base_addr;
1182 Dl_info dlinfo;
1183
1184 if (libjvm_base_addr == NULL) {
1185 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1186 libjvm_base_addr = (address)dlinfo.dli_fbase;
1187 }
1188 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1189 }
1190
1191 if (dladdr((void *)addr, &dlinfo) != 0) {
1192 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1193 }
1194
1195 return false;
1196 }
1197
1198
1199 #define MACH_MAXSYMLEN 256
1200
1201 bool os::dll_address_to_function_name(address addr, char *buf,
1202 int buflen, int *offset,
1203 bool demangle) {
1204 // buf is not optional, but offset is optional
1205 assert(buf != NULL, "sanity check");
1206
1207 Dl_info dlinfo;
1208 char localbuf[MACH_MAXSYMLEN];
1209
1210 if (dladdr((void*)addr, &dlinfo) != 0) {
1211 // see if we have a matching symbol
1212 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1213 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1214 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1215 }
1216 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1217 return true;
1218 }
1219 // no matching symbol so try for just file info
1220 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1221 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1222 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1223 return true;
1224 }
1225 }
1226
1227 // Handle non-dynamic manually:
1228 if (dlinfo.dli_fbase != NULL &&
1229 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1230 dlinfo.dli_fbase)) {
1231 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1232 jio_snprintf(buf, buflen, "%s", localbuf);
1233 }
1234 return true;
1235 }
1236 }
1237 buf[0] = '\0';
1238 if (offset != NULL) *offset = -1;
1239 return false;
1240 }
1241
1242 // ported from solaris version
1243 bool os::dll_address_to_library_name(address addr, char* buf,
1244 int buflen, int* offset) {
1245 // buf is not optional, but offset is optional
1246 assert(buf != NULL, "sanity check");
1247
1248 Dl_info dlinfo;
1249
1250 if (dladdr((void*)addr, &dlinfo) != 0) {
1251 if (dlinfo.dli_fname != NULL) {
1252 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1253 }
1254 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1255 *offset = addr - (address)dlinfo.dli_fbase;
1256 }
1257 return true;
1258 }
1259
1260 buf[0] = '\0';
1261 if (offset) *offset = -1;
1262 return false;
1263 }
1264
1265 // Loads .dll/.so and
1266 // in case of error it checks if .dll/.so was built for the
1267 // same architecture as Hotspot is running on
1268
1269 #ifdef __APPLE__
1270 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1271 #ifdef STATIC_BUILD
1272 return os::get_default_process_handle();
1273 #else
1274 log_info(os)("attempting shared library load of %s", filename);
1275
1276 void * result= ::dlopen(filename, RTLD_LAZY);
1277 if (result != NULL) {
1278 Events::log(NULL, "Loaded shared library %s", filename);
1279 // Successful loading
1280 log_info(os)("shared library load of %s was successful", filename);
1281 return result;
1282 }
1283
1284 const char* error_report = ::dlerror();
1285 if (error_report == NULL) {
1286 error_report = "dlerror returned no error description";
1287 }
1288 if (ebuf != NULL && ebuflen > 0) {
1289 // Read system error message into ebuf
1290 ::strncpy(ebuf, error_report, ebuflen-1);
1291 ebuf[ebuflen-1]='\0';
1292 }
1293 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1294 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1295
1296 return NULL;
1297 #endif // STATIC_BUILD
1298 }
1299 #else
1300 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1301 #ifdef STATIC_BUILD
1302 return os::get_default_process_handle();
1303 #else
1304 log_info(os)("attempting shared library load of %s", filename);
1305 void * result= ::dlopen(filename, RTLD_LAZY);
1306 if (result != NULL) {
1307 Events::log(NULL, "Loaded shared library %s", filename);
1308 // Successful loading
1309 log_info(os)("shared library load of %s was successful", filename);
1310 return result;
1311 }
1312
1313 Elf32_Ehdr elf_head;
1314
1315 const char* const error_report = ::dlerror();
1316 if (error_report == NULL) {
1317 error_report = "dlerror returned no error description";
1318 }
1319 if (ebuf != NULL && ebuflen > 0) {
1320 // Read system error message into ebuf
1321 ::strncpy(ebuf, error_report, ebuflen-1);
1322 ebuf[ebuflen-1]='\0';
1323 }
1324 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1325 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1326
1327 int diag_msg_max_length=ebuflen-strlen(ebuf);
1328 char* diag_msg_buf=ebuf+strlen(ebuf);
1329
1330 if (diag_msg_max_length==0) {
1331 // No more space in ebuf for additional diagnostics message
1332 return NULL;
1333 }
1334
1335
1336 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1337
1338 if (file_descriptor < 0) {
1339 // Can't open library, report dlerror() message
1340 return NULL;
1341 }
1342
1343 bool failed_to_read_elf_head=
1344 (sizeof(elf_head)!=
1345 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1346
1347 ::close(file_descriptor);
1348 if (failed_to_read_elf_head) {
1349 // file i/o error - report dlerror() msg
1350 return NULL;
1351 }
1352
1353 typedef struct {
1354 Elf32_Half code; // Actual value as defined in elf.h
1355 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1356 char elf_class; // 32 or 64 bit
1357 char endianess; // MSB or LSB
1358 char* name; // String representation
1359 } arch_t;
1360
1361 #ifndef EM_486
1362 #define EM_486 6 /* Intel 80486 */
1363 #endif
1364
1365 #ifndef EM_MIPS_RS3_LE
1366 #define EM_MIPS_RS3_LE 10 /* MIPS */
1367 #endif
1368
1369 #ifndef EM_PPC64
1370 #define EM_PPC64 21 /* PowerPC64 */
1371 #endif
1372
1373 #ifndef EM_S390
1374 #define EM_S390 22 /* IBM System/390 */
1375 #endif
1376
1377 #ifndef EM_IA_64
1378 #define EM_IA_64 50 /* HP/Intel IA-64 */
1379 #endif
1380
1381 #ifndef EM_X86_64
1382 #define EM_X86_64 62 /* AMD x86-64 */
1383 #endif
1384
1385 static const arch_t arch_array[]={
1386 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1387 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1388 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1389 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1390 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1391 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1392 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1393 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1394 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1395 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1396 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1397 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1398 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1399 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1400 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1401 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1402 };
1403
1404 #if (defined IA32)
1405 static Elf32_Half running_arch_code=EM_386;
1406 #elif (defined AMD64)
1407 static Elf32_Half running_arch_code=EM_X86_64;
1408 #elif (defined IA64)
1409 static Elf32_Half running_arch_code=EM_IA_64;
1410 #elif (defined __sparc) && (defined _LP64)
1411 static Elf32_Half running_arch_code=EM_SPARCV9;
1412 #elif (defined __sparc) && (!defined _LP64)
1413 static Elf32_Half running_arch_code=EM_SPARC;
1414 #elif (defined __powerpc64__)
1415 static Elf32_Half running_arch_code=EM_PPC64;
1416 #elif (defined __powerpc__)
1417 static Elf32_Half running_arch_code=EM_PPC;
1418 #elif (defined ARM)
1419 static Elf32_Half running_arch_code=EM_ARM;
1420 #elif (defined S390)
1421 static Elf32_Half running_arch_code=EM_S390;
1422 #elif (defined ALPHA)
1423 static Elf32_Half running_arch_code=EM_ALPHA;
1424 #elif (defined MIPSEL)
1425 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1426 #elif (defined PARISC)
1427 static Elf32_Half running_arch_code=EM_PARISC;
1428 #elif (defined MIPS)
1429 static Elf32_Half running_arch_code=EM_MIPS;
1430 #elif (defined M68K)
1431 static Elf32_Half running_arch_code=EM_68K;
1432 #else
1433 #error Method os::dll_load requires that one of following is defined:\
1434 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1435 #endif
1436
1437 // Identify compatability class for VM's architecture and library's architecture
1438 // Obtain string descriptions for architectures
1439
1440 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1441 int running_arch_index=-1;
1442
1443 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1444 if (running_arch_code == arch_array[i].code) {
1445 running_arch_index = i;
1446 }
1447 if (lib_arch.code == arch_array[i].code) {
1448 lib_arch.compat_class = arch_array[i].compat_class;
1449 lib_arch.name = arch_array[i].name;
1450 }
1451 }
1452
1453 assert(running_arch_index != -1,
1454 "Didn't find running architecture code (running_arch_code) in arch_array");
1455 if (running_arch_index == -1) {
1456 // Even though running architecture detection failed
1457 // we may still continue with reporting dlerror() message
1458 return NULL;
1459 }
1460
1461 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1462 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1463 return NULL;
1464 }
1465
1466 #ifndef S390
1467 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1468 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1469 return NULL;
1470 }
1471 #endif // !S390
1472
1473 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1474 if (lib_arch.name!=NULL) {
1475 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1476 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1477 lib_arch.name, arch_array[running_arch_index].name);
1478 } else {
1479 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1480 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1481 lib_arch.code,
1482 arch_array[running_arch_index].name);
1483 }
1484 }
1485
1486 return NULL;
1487 #endif // STATIC_BUILD
1488 }
1489 #endif // !__APPLE__
1490
1491 void* os::get_default_process_handle() {
1492 #ifdef __APPLE__
1493 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1494 // to avoid finding unexpected symbols on second (or later)
1495 // loads of a library.
1496 return (void*)::dlopen(NULL, RTLD_FIRST);
1497 #else
1498 return (void*)::dlopen(NULL, RTLD_LAZY);
1499 #endif
1500 }
1501
1502 // XXX: Do we need a lock around this as per Linux?
1503 void* os::dll_lookup(void* handle, const char* name) {
1504 return dlsym(handle, name);
1505 }
1506
1507 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1508 outputStream * out = (outputStream *) param;
1509 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1510 return 0;
1511 }
1512
1513 void os::print_dll_info(outputStream *st) {
1514 st->print_cr("Dynamic libraries:");
1515 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1516 st->print_cr("Error: Cannot print dynamic libraries.");
1517 }
1518 }
1519
1520 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1521 #ifdef RTLD_DI_LINKMAP
1522 Dl_info dli;
1523 void *handle;
1524 Link_map *map;
1525 Link_map *p;
1526
1527 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1528 dli.dli_fname == NULL) {
1529 return 1;
1530 }
1531 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1532 if (handle == NULL) {
1533 return 1;
1534 }
1535 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1536 if (map == NULL) {
1537 dlclose(handle);
1538 return 1;
1539 }
1540
1541 while (map->l_prev != NULL)
1542 map = map->l_prev;
1543
1544 while (map != NULL) {
1545 // Value for top_address is returned as 0 since we don't have any information about module size
1546 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1547 dlclose(handle);
1548 return 1;
1549 }
1550 map = map->l_next;
1551 }
1552
1553 dlclose(handle);
1554 #elif defined(__APPLE__)
1555 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1556 // Value for top_address is returned as 0 since we don't have any information about module size
1557 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1558 return 1;
1559 }
1560 }
1561 return 0;
1562 #else
1563 return 1;
1564 #endif
1565 }
1566
1567 void os::get_summary_os_info(char* buf, size_t buflen) {
1568 // These buffers are small because we want this to be brief
1569 // and not use a lot of stack while generating the hs_err file.
1570 char os[100];
1571 size_t size = sizeof(os);
1572 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1573 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1574 #ifdef __APPLE__
1575 strncpy(os, "Darwin", sizeof(os));
1576 #elif __OpenBSD__
1577 strncpy(os, "OpenBSD", sizeof(os));
1578 #else
1579 strncpy(os, "BSD", sizeof(os));
1580 #endif
1581 }
1582
1583 char release[100];
1584 size = sizeof(release);
1585 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1586 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1587 // if error, leave blank
1588 strncpy(release, "", sizeof(release));
1589 }
1590 snprintf(buf, buflen, "%s %s", os, release);
1591 }
1592
1593 void os::print_os_info_brief(outputStream* st) {
1594 os::Posix::print_uname_info(st);
1595 }
1596
1597 void os::print_os_info(outputStream* st) {
1598 st->print("OS:");
1599
1600 os::Posix::print_uname_info(st);
1601
1602 os::Bsd::print_uptime_info(st);
1603
1604 os::Posix::print_rlimit_info(st);
1605
1606 os::Posix::print_load_average(st);
1607 }
1608
1609 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1610 // Nothing to do for now.
1611 }
1612
1613 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1614 unsigned int mhz;
1615 size_t size = sizeof(mhz);
1616 int mib[] = { CTL_HW, HW_CPU_FREQ };
1617 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1618 mhz = 1; // looks like an error but can be divided by
1619 } else {
1620 mhz /= 1000000; // reported in millions
1621 }
1622
1623 char model[100];
1624 size = sizeof(model);
1625 int mib_model[] = { CTL_HW, HW_MODEL };
1626 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1627 strncpy(model, cpu_arch, sizeof(model));
1628 }
1629
1630 char machine[100];
1631 size = sizeof(machine);
1632 int mib_machine[] = { CTL_HW, HW_MACHINE };
1633 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1634 strncpy(machine, "", sizeof(machine));
1635 }
1636
1637 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1638 }
1639
1640 void os::print_memory_info(outputStream* st) {
1641 xsw_usage swap_usage;
1642 size_t size = sizeof(swap_usage);
1643
1644 st->print("Memory:");
1645 st->print(" %dk page", os::vm_page_size()>>10);
1646
1647 st->print(", physical " UINT64_FORMAT "k",
1648 os::physical_memory() >> 10);
1649 st->print("(" UINT64_FORMAT "k free)",
1650 os::available_memory() >> 10);
1651
1652 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1653 if (size >= offset_of(xsw_usage, xsu_used)) {
1654 st->print(", swap " UINT64_FORMAT "k",
1655 ((julong) swap_usage.xsu_total) >> 10);
1656 st->print("(" UINT64_FORMAT "k free)",
1657 ((julong) swap_usage.xsu_avail) >> 10);
1658 }
1659 }
1660
1661 st->cr();
1662 }
1663
1664 static void print_signal_handler(outputStream* st, int sig,
1665 char* buf, size_t buflen);
1666
1667 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1668 st->print_cr("Signal Handlers:");
1669 print_signal_handler(st, SIGSEGV, buf, buflen);
1670 print_signal_handler(st, SIGBUS , buf, buflen);
1671 print_signal_handler(st, SIGFPE , buf, buflen);
1672 print_signal_handler(st, SIGPIPE, buf, buflen);
1673 print_signal_handler(st, SIGXFSZ, buf, buflen);
1674 print_signal_handler(st, SIGILL , buf, buflen);
1675 print_signal_handler(st, SR_signum, buf, buflen);
1676 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1677 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1678 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1679 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1680 }
1681
1682 static char saved_jvm_path[MAXPATHLEN] = {0};
1683
1684 // Find the full path to the current module, libjvm
1685 void os::jvm_path(char *buf, jint buflen) {
1686 // Error checking.
1687 if (buflen < MAXPATHLEN) {
1688 assert(false, "must use a large-enough buffer");
1689 buf[0] = '\0';
1690 return;
1691 }
1692 // Lazy resolve the path to current module.
1693 if (saved_jvm_path[0] != 0) {
1694 strcpy(buf, saved_jvm_path);
1695 return;
1696 }
1697
1698 char dli_fname[MAXPATHLEN];
1699 bool ret = dll_address_to_library_name(
1700 CAST_FROM_FN_PTR(address, os::jvm_path),
1701 dli_fname, sizeof(dli_fname), NULL);
1702 assert(ret, "cannot locate libjvm");
1703 char *rp = NULL;
1704 if (ret && dli_fname[0] != '\0') {
1705 rp = os::Posix::realpath(dli_fname, buf, buflen);
1706 }
1707 if (rp == NULL) {
1708 return;
1709 }
1710
1711 if (Arguments::sun_java_launcher_is_altjvm()) {
1712 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1713 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1714 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1715 // appears at the right place in the string, then assume we are
1716 // installed in a JDK and we're done. Otherwise, check for a
1717 // JAVA_HOME environment variable and construct a path to the JVM
1718 // being overridden.
1719
1720 const char *p = buf + strlen(buf) - 1;
1721 for (int count = 0; p > buf && count < 5; ++count) {
1722 for (--p; p > buf && *p != '/'; --p)
1723 /* empty */ ;
1724 }
1725
1726 if (strncmp(p, "/jre/lib/", 9) != 0) {
1727 // Look for JAVA_HOME in the environment.
1728 char* java_home_var = ::getenv("JAVA_HOME");
1729 if (java_home_var != NULL && java_home_var[0] != 0) {
1730 char* jrelib_p;
1731 int len;
1732
1733 // Check the current module name "libjvm"
1734 p = strrchr(buf, '/');
1735 assert(strstr(p, "/libjvm") == p, "invalid library name");
1736
1737 rp = os::Posix::realpath(java_home_var, buf, buflen);
1738 if (rp == NULL) {
1739 return;
1740 }
1741
1742 // determine if this is a legacy image or modules image
1743 // modules image doesn't have "jre" subdirectory
1744 len = strlen(buf);
1745 assert(len < buflen, "Ran out of buffer space");
1746 jrelib_p = buf + len;
1747
1748 // Add the appropriate library subdir
1749 snprintf(jrelib_p, buflen-len, "/jre/lib");
1750 if (0 != access(buf, F_OK)) {
1751 snprintf(jrelib_p, buflen-len, "/lib");
1752 }
1753
1754 // Add the appropriate client or server subdir
1755 len = strlen(buf);
1756 jrelib_p = buf + len;
1757 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1758 if (0 != access(buf, F_OK)) {
1759 snprintf(jrelib_p, buflen-len, "%s", "");
1760 }
1761
1762 // If the path exists within JAVA_HOME, add the JVM library name
1763 // to complete the path to JVM being overridden. Otherwise fallback
1764 // to the path to the current library.
1765 if (0 == access(buf, F_OK)) {
1766 // Use current module name "libjvm"
1767 len = strlen(buf);
1768 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1769 } else {
1770 // Fall back to path of current library
1771 rp = os::Posix::realpath(dli_fname, buf, buflen);
1772 if (rp == NULL) {
1773 return;
1774 }
1775 }
1776 }
1777 }
1778 }
1779
1780 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1781 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1782 }
1783
1784 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1785 // no prefix required, not even "_"
1786 }
1787
1788 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1789 // no suffix required
1790 }
1791
1792 ////////////////////////////////////////////////////////////////////////////////
1793 // sun.misc.Signal support
1794
1795 static void UserHandler(int sig, void *siginfo, void *context) {
1796 // Ctrl-C is pressed during error reporting, likely because the error
1797 // handler fails to abort. Let VM die immediately.
1798 if (sig == SIGINT && VMError::is_error_reported()) {
1799 os::die();
1800 }
1801
1802 os::signal_notify(sig);
1803 }
1804
1805 void* os::user_handler() {
1806 return CAST_FROM_FN_PTR(void*, UserHandler);
1807 }
1808
1809 extern "C" {
1810 typedef void (*sa_handler_t)(int);
1811 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1812 }
1813
1814 void* os::signal(int signal_number, void* handler) {
1815 struct sigaction sigAct, oldSigAct;
1816
1817 sigfillset(&(sigAct.sa_mask));
1818 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1819 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1820
1821 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1822 // -1 means registration failed
1823 return (void *)-1;
1824 }
1825
1826 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1827 }
1828
1829 void os::signal_raise(int signal_number) {
1830 ::raise(signal_number);
1831 }
1832
1833 // The following code is moved from os.cpp for making this
1834 // code platform specific, which it is by its very nature.
1835
1836 // Will be modified when max signal is changed to be dynamic
1837 int os::sigexitnum_pd() {
1838 return NSIG;
1839 }
1840
1841 // a counter for each possible signal value
1842 static volatile jint pending_signals[NSIG+1] = { 0 };
1843 static Semaphore* sig_sem = NULL;
1844
1845 static void jdk_misc_signal_init() {
1846 // Initialize signal structures
1847 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1848
1849 // Initialize signal semaphore
1850 sig_sem = new Semaphore();
1851 }
1852
1853 void os::signal_notify(int sig) {
1854 if (sig_sem != NULL) {
1855 Atomic::inc(&pending_signals[sig]);
1856 sig_sem->signal();
1857 } else {
1858 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1859 // initialization isn't called.
1860 assert(ReduceSignalUsage, "signal semaphore should be created");
1861 }
1862 }
1863
1864 static int check_pending_signals() {
1865 for (;;) {
1866 for (int i = 0; i < NSIG + 1; i++) {
1867 jint n = pending_signals[i];
1868 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1869 return i;
1870 }
1871 }
1872 JavaThread *thread = JavaThread::current();
1873 ThreadBlockInVM tbivm(thread);
1874
1875 bool threadIsSuspended;
1876 do {
1877 thread->set_suspend_equivalent();
1878 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1879 sig_sem->wait();
1880
1881 // were we externally suspended while we were waiting?
1882 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1883 if (threadIsSuspended) {
1884 // The semaphore has been incremented, but while we were waiting
1885 // another thread suspended us. We don't want to continue running
1886 // while suspended because that would surprise the thread that
1887 // suspended us.
1888 sig_sem->signal();
1889
1890 thread->java_suspend_self();
1891 }
1892 } while (threadIsSuspended);
1893 }
1894 }
1895
1896 int os::signal_wait() {
1897 return check_pending_signals();
1898 }
1899
1900 ////////////////////////////////////////////////////////////////////////////////
1901 // Virtual Memory
1902
1903 int os::vm_page_size() {
1904 // Seems redundant as all get out
1905 assert(os::Bsd::page_size() != -1, "must call os::init");
1906 return os::Bsd::page_size();
1907 }
1908
1909 // Solaris allocates memory by pages.
1910 int os::vm_allocation_granularity() {
1911 assert(os::Bsd::page_size() != -1, "must call os::init");
1912 return os::Bsd::page_size();
1913 }
1914
1915 // Rationale behind this function:
1916 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1917 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1918 // samples for JITted code. Here we create private executable mapping over the code cache
1919 // and then we can use standard (well, almost, as mapping can change) way to provide
1920 // info for the reporting script by storing timestamp and location of symbol
1921 void bsd_wrap_code(char* base, size_t size) {
1922 static volatile jint cnt = 0;
1923
1924 if (!UseOprofile) {
1925 return;
1926 }
1927
1928 char buf[PATH_MAX + 1];
1929 int num = Atomic::add(&cnt, 1);
1930
1931 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1932 os::get_temp_directory(), os::current_process_id(), num);
1933 unlink(buf);
1934
1935 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1936
1937 if (fd != -1) {
1938 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1939 if (rv != (off_t)-1) {
1940 if (::write(fd, "", 1) == 1) {
1941 mmap(base, size,
1942 PROT_READ|PROT_WRITE|PROT_EXEC,
1943 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1944 }
1945 }
1946 ::close(fd);
1947 unlink(buf);
1948 }
1949 }
1950
1951 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1952 int err) {
1953 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1954 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1955 os::errno_name(err), err);
1956 }
1957
1958 // NOTE: Bsd kernel does not really reserve the pages for us.
1959 // All it does is to check if there are enough free pages
1960 // left at the time of mmap(). This could be a potential
1961 // problem.
1962 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1963 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1964 #ifdef __OpenBSD__
1965 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1966 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1967 if (::mprotect(addr, size, prot) == 0) {
1968 return true;
1969 }
1970 #else
1971 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1972 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1973 if (res != (uintptr_t) MAP_FAILED) {
1974 return true;
1975 }
1976 #endif
1977
1978 // Warn about any commit errors we see in non-product builds just
1979 // in case mmap() doesn't work as described on the man page.
1980 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1981
1982 return false;
1983 }
1984
1985 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1986 bool exec) {
1987 // alignment_hint is ignored on this OS
1988 return pd_commit_memory(addr, size, exec);
1989 }
1990
1991 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1992 const char* mesg) {
1993 assert(mesg != NULL, "mesg must be specified");
1994 if (!pd_commit_memory(addr, size, exec)) {
1995 // add extra info in product mode for vm_exit_out_of_memory():
1996 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1997 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1998 }
1999 }
2000
2001 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2002 size_t alignment_hint, bool exec,
2003 const char* mesg) {
2004 // alignment_hint is ignored on this OS
2005 pd_commit_memory_or_exit(addr, size, exec, mesg);
2006 }
2007
2008 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2009 }
2010
2011 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2012 ::madvise(addr, bytes, MADV_DONTNEED);
2013 }
2014
2015 void os::numa_make_global(char *addr, size_t bytes) {
2016 }
2017
2018 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2019 }
2020
2021 bool os::numa_topology_changed() { return false; }
2022
2023 size_t os::numa_get_groups_num() {
2024 return 1;
2025 }
2026
2027 int os::numa_get_group_id() {
2028 return 0;
2029 }
2030
2031 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2032 if (size > 0) {
2033 ids[0] = 0;
2034 return 1;
2035 }
2036 return 0;
2037 }
2038
2039 int os::numa_get_group_id_for_address(const void* address) {
2040 return 0;
2041 }
2042
2043 bool os::get_page_info(char *start, page_info* info) {
2044 return false;
2045 }
2046
2047 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2048 return end;
2049 }
2050
2051
2052 bool os::pd_uncommit_memory(char* addr, size_t size) {
2053 #ifdef __OpenBSD__
2054 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2055 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2056 return ::mprotect(addr, size, PROT_NONE) == 0;
2057 #else
2058 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2059 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2060 return res != (uintptr_t) MAP_FAILED;
2061 #endif
2062 }
2063
2064 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2065 return os::commit_memory(addr, size, !ExecMem);
2066 }
2067
2068 // If this is a growable mapping, remove the guard pages entirely by
2069 // munmap()ping them. If not, just call uncommit_memory().
2070 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2071 return os::uncommit_memory(addr, size);
2072 }
2073
2074 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2075 // at 'requested_addr'. If there are existing memory mappings at the same
2076 // location, however, they will be overwritten. If 'fixed' is false,
2077 // 'requested_addr' is only treated as a hint, the return value may or
2078 // may not start from the requested address. Unlike Bsd mmap(), this
2079 // function returns NULL to indicate failure.
2080 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2081 char * addr;
2082 int flags;
2083
2084 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2085 if (fixed) {
2086 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2087 flags |= MAP_FIXED;
2088 }
2089
2090 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2091 // touch an uncommitted page. Otherwise, the read/write might
2092 // succeed if we have enough swap space to back the physical page.
2093 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2094 flags, -1, 0);
2095
2096 return addr == MAP_FAILED ? NULL : addr;
2097 }
2098
2099 static int anon_munmap(char * addr, size_t size) {
2100 return ::munmap(addr, size) == 0;
2101 }
2102
2103 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2104 size_t alignment_hint) {
2105 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2106 }
2107
2108 bool os::pd_release_memory(char* addr, size_t size) {
2109 return anon_munmap(addr, size);
2110 }
2111
2112 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2113 // Bsd wants the mprotect address argument to be page aligned.
2114 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2115
2116 // According to SUSv3, mprotect() should only be used with mappings
2117 // established by mmap(), and mmap() always maps whole pages. Unaligned
2118 // 'addr' likely indicates problem in the VM (e.g. trying to change
2119 // protection of malloc'ed or statically allocated memory). Check the
2120 // caller if you hit this assert.
2121 assert(addr == bottom, "sanity check");
2122
2123 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2124 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2125 return ::mprotect(bottom, size, prot) == 0;
2126 }
2127
2128 // Set protections specified
2129 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2130 bool is_committed) {
2131 unsigned int p = 0;
2132 switch (prot) {
2133 case MEM_PROT_NONE: p = PROT_NONE; break;
2134 case MEM_PROT_READ: p = PROT_READ; break;
2135 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2136 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2137 default:
2138 ShouldNotReachHere();
2139 }
2140 // is_committed is unused.
2141 return bsd_mprotect(addr, bytes, p);
2142 }
2143
2144 bool os::guard_memory(char* addr, size_t size) {
2145 return bsd_mprotect(addr, size, PROT_NONE);
2146 }
2147
2148 bool os::unguard_memory(char* addr, size_t size) {
2149 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2150 }
2151
2152 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2153 return false;
2154 }
2155
2156 // Large page support
2157
2158 static size_t _large_page_size = 0;
2159
2160 void os::large_page_init() {
2161 }
2162
2163
2164 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2165 fatal("os::reserve_memory_special should not be called on BSD.");
2166 return NULL;
2167 }
2168
2169 bool os::release_memory_special(char* base, size_t bytes) {
2170 fatal("os::release_memory_special should not be called on BSD.");
2171 return false;
2172 }
2173
2174 size_t os::large_page_size() {
2175 return _large_page_size;
2176 }
2177
2178 bool os::can_commit_large_page_memory() {
2179 // Does not matter, we do not support huge pages.
2180 return false;
2181 }
2182
2183 bool os::can_execute_large_page_memory() {
2184 // Does not matter, we do not support huge pages.
2185 return false;
2186 }
2187
2188 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2189 assert(file_desc >= 0, "file_desc is not valid");
2190 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2191 if (result != NULL) {
2192 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2193 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2194 }
2195 }
2196 return result;
2197 }
2198
2199 // Reserve memory at an arbitrary address, only if that area is
2200 // available (and not reserved for something else).
2201
2202 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2203 // Assert only that the size is a multiple of the page size, since
2204 // that's all that mmap requires, and since that's all we really know
2205 // about at this low abstraction level. If we need higher alignment,
2206 // we can either pass an alignment to this method or verify alignment
2207 // in one of the methods further up the call chain. See bug 5044738.
2208 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2209
2210 // Repeatedly allocate blocks until the block is allocated at the
2211 // right spot.
2212
2213 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2214 // if kernel honors the hint then we can return immediately.
2215 char * addr = anon_mmap(requested_addr, bytes, false);
2216 if (addr == requested_addr) {
2217 return requested_addr;
2218 }
2219
2220 if (addr != NULL) {
2221 // mmap() is successful but it fails to reserve at the requested address
2222 anon_munmap(addr, bytes);
2223 }
2224
2225 return NULL;
2226 }
2227
2228 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2229 void os::infinite_sleep() {
2230 while (true) { // sleep forever ...
2231 ::sleep(100); // ... 100 seconds at a time
2232 }
2233 }
2234
2235 // Used to convert frequent JVM_Yield() to nops
2236 bool os::dont_yield() {
2237 return DontYieldALot;
2238 }
2239
2240 void os::naked_yield() {
2241 sched_yield();
2242 }
2243
2244 ////////////////////////////////////////////////////////////////////////////////
2245 // thread priority support
2246
2247 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2248 // only supports dynamic priority, static priority must be zero. For real-time
2249 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2250 // However, for large multi-threaded applications, SCHED_RR is not only slower
2251 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2252 // of 5 runs - Sep 2005).
2253 //
2254 // The following code actually changes the niceness of kernel-thread/LWP. It
2255 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2256 // not the entire user process, and user level threads are 1:1 mapped to kernel
2257 // threads. It has always been the case, but could change in the future. For
2258 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2259 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2260 // (e.g., root privilege or CAP_SYS_NICE capability).
2261
2262 #if !defined(__APPLE__)
2263 int os::java_to_os_priority[CriticalPriority + 1] = {
2264 19, // 0 Entry should never be used
2265
2266 0, // 1 MinPriority
2267 3, // 2
2268 6, // 3
2269
2270 10, // 4
2271 15, // 5 NormPriority
2272 18, // 6
2273
2274 21, // 7
2275 25, // 8
2276 28, // 9 NearMaxPriority
2277
2278 31, // 10 MaxPriority
2279
2280 31 // 11 CriticalPriority
2281 };
2282 #else
2283 // Using Mach high-level priority assignments
2284 int os::java_to_os_priority[CriticalPriority + 1] = {
2285 0, // 0 Entry should never be used (MINPRI_USER)
2286
2287 27, // 1 MinPriority
2288 28, // 2
2289 29, // 3
2290
2291 30, // 4
2292 31, // 5 NormPriority (BASEPRI_DEFAULT)
2293 32, // 6
2294
2295 33, // 7
2296 34, // 8
2297 35, // 9 NearMaxPriority
2298
2299 36, // 10 MaxPriority
2300
2301 36 // 11 CriticalPriority
2302 };
2303 #endif
2304
2305 static int prio_init() {
2306 if (ThreadPriorityPolicy == 1) {
2307 if (geteuid() != 0) {
2308 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2309 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2310 "e.g., being the root user. If the necessary permission is not " \
2311 "possessed, changes to priority will be silently ignored.");
2312 }
2313 }
2314 }
2315 if (UseCriticalJavaThreadPriority) {
2316 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2317 }
2318 return 0;
2319 }
2320
2321 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2322 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2323
2324 #ifdef __OpenBSD__
2325 // OpenBSD pthread_setprio starves low priority threads
2326 return OS_OK;
2327 #elif defined(__FreeBSD__)
2328 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2329 return (ret == 0) ? OS_OK : OS_ERR;
2330 #elif defined(__APPLE__) || defined(__NetBSD__)
2331 struct sched_param sp;
2332 int policy;
2333
2334 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2335 return OS_ERR;
2336 }
2337
2338 sp.sched_priority = newpri;
2339 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2340 return OS_ERR;
2341 }
2342
2343 return OS_OK;
2344 #else
2345 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2346 return (ret == 0) ? OS_OK : OS_ERR;
2347 #endif
2348 }
2349
2350 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2351 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2352 *priority_ptr = java_to_os_priority[NormPriority];
2353 return OS_OK;
2354 }
2355
2356 errno = 0;
2357 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2358 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2359 #elif defined(__APPLE__) || defined(__NetBSD__)
2360 int policy;
2361 struct sched_param sp;
2362
2363 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2364 if (res != 0) {
2365 *priority_ptr = -1;
2366 return OS_ERR;
2367 } else {
2368 *priority_ptr = sp.sched_priority;
2369 return OS_OK;
2370 }
2371 #else
2372 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2373 #endif
2374 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2375 }
2376
2377 ////////////////////////////////////////////////////////////////////////////////
2378 // suspend/resume support
2379
2380 // The low-level signal-based suspend/resume support is a remnant from the
2381 // old VM-suspension that used to be for java-suspension, safepoints etc,
2382 // within hotspot. Currently used by JFR's OSThreadSampler
2383 //
2384 // The remaining code is greatly simplified from the more general suspension
2385 // code that used to be used.
2386 //
2387 // The protocol is quite simple:
2388 // - suspend:
2389 // - sends a signal to the target thread
2390 // - polls the suspend state of the osthread using a yield loop
2391 // - target thread signal handler (SR_handler) sets suspend state
2392 // and blocks in sigsuspend until continued
2393 // - resume:
2394 // - sets target osthread state to continue
2395 // - sends signal to end the sigsuspend loop in the SR_handler
2396 //
2397 // Note that the SR_lock plays no role in this suspend/resume protocol,
2398 // but is checked for NULL in SR_handler as a thread termination indicator.
2399 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2400 //
2401 // Note that resume_clear_context() and suspend_save_context() are needed
2402 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2403 // which in part is used by:
2404 // - Forte Analyzer: AsyncGetCallTrace()
2405 // - StackBanging: get_frame_at_stack_banging_point()
2406
2407 static void resume_clear_context(OSThread *osthread) {
2408 osthread->set_ucontext(NULL);
2409 osthread->set_siginfo(NULL);
2410 }
2411
2412 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2413 osthread->set_ucontext(context);
2414 osthread->set_siginfo(siginfo);
2415 }
2416
2417 // Handler function invoked when a thread's execution is suspended or
2418 // resumed. We have to be careful that only async-safe functions are
2419 // called here (Note: most pthread functions are not async safe and
2420 // should be avoided.)
2421 //
2422 // Note: sigwait() is a more natural fit than sigsuspend() from an
2423 // interface point of view, but sigwait() prevents the signal hander
2424 // from being run. libpthread would get very confused by not having
2425 // its signal handlers run and prevents sigwait()'s use with the
2426 // mutex granting granting signal.
2427 //
2428 // Currently only ever called on the VMThread or JavaThread
2429 //
2430 #ifdef __APPLE__
2431 static OSXSemaphore sr_semaphore;
2432 #else
2433 static PosixSemaphore sr_semaphore;
2434 #endif
2435
2436 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2437 // Save and restore errno to avoid confusing native code with EINTR
2438 // after sigsuspend.
2439 int old_errno = errno;
2440
2441 Thread* thread = Thread::current_or_null_safe();
2442 assert(thread != NULL, "Missing current thread in SR_handler");
2443
2444 // On some systems we have seen signal delivery get "stuck" until the signal
2445 // mask is changed as part of thread termination. Check that the current thread
2446 // has not already terminated (via SR_lock()) - else the following assertion
2447 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2448 // destructor has completed.
2449
2450 if (thread->SR_lock() == NULL) {
2451 return;
2452 }
2453
2454 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2455
2456 OSThread* osthread = thread->osthread();
2457
2458 os::SuspendResume::State current = osthread->sr.state();
2459 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2460 suspend_save_context(osthread, siginfo, context);
2461
2462 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2463 os::SuspendResume::State state = osthread->sr.suspended();
2464 if (state == os::SuspendResume::SR_SUSPENDED) {
2465 sigset_t suspend_set; // signals for sigsuspend()
2466
2467 // get current set of blocked signals and unblock resume signal
2468 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2469 sigdelset(&suspend_set, SR_signum);
2470
2471 sr_semaphore.signal();
2472 // wait here until we are resumed
2473 while (1) {
2474 sigsuspend(&suspend_set);
2475
2476 os::SuspendResume::State result = osthread->sr.running();
2477 if (result == os::SuspendResume::SR_RUNNING) {
2478 sr_semaphore.signal();
2479 break;
2480 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2481 ShouldNotReachHere();
2482 }
2483 }
2484
2485 } else if (state == os::SuspendResume::SR_RUNNING) {
2486 // request was cancelled, continue
2487 } else {
2488 ShouldNotReachHere();
2489 }
2490
2491 resume_clear_context(osthread);
2492 } else if (current == os::SuspendResume::SR_RUNNING) {
2493 // request was cancelled, continue
2494 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2495 // ignore
2496 } else {
2497 // ignore
2498 }
2499
2500 errno = old_errno;
2501 }
2502
2503
2504 static int SR_initialize() {
2505 struct sigaction act;
2506 char *s;
2507 // Get signal number to use for suspend/resume
2508 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2509 int sig = ::strtol(s, 0, 10);
2510 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2511 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2512 SR_signum = sig;
2513 } else {
2514 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2515 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2516 }
2517 }
2518
2519 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2520 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2521
2522 sigemptyset(&SR_sigset);
2523 sigaddset(&SR_sigset, SR_signum);
2524
2525 // Set up signal handler for suspend/resume
2526 act.sa_flags = SA_RESTART|SA_SIGINFO;
2527 act.sa_handler = (void (*)(int)) SR_handler;
2528
2529 // SR_signum is blocked by default.
2530 // 4528190 - We also need to block pthread restart signal (32 on all
2531 // supported Bsd platforms). Note that BsdThreads need to block
2532 // this signal for all threads to work properly. So we don't have
2533 // to use hard-coded signal number when setting up the mask.
2534 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2535
2536 if (sigaction(SR_signum, &act, 0) == -1) {
2537 return -1;
2538 }
2539
2540 // Save signal flag
2541 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2542 return 0;
2543 }
2544
2545 static int sr_notify(OSThread* osthread) {
2546 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2547 assert_status(status == 0, status, "pthread_kill");
2548 return status;
2549 }
2550
2551 // "Randomly" selected value for how long we want to spin
2552 // before bailing out on suspending a thread, also how often
2553 // we send a signal to a thread we want to resume
2554 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2555 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2556
2557 // returns true on success and false on error - really an error is fatal
2558 // but this seems the normal response to library errors
2559 static bool do_suspend(OSThread* osthread) {
2560 assert(osthread->sr.is_running(), "thread should be running");
2561 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2562
2563 // mark as suspended and send signal
2564 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2565 // failed to switch, state wasn't running?
2566 ShouldNotReachHere();
2567 return false;
2568 }
2569
2570 if (sr_notify(osthread) != 0) {
2571 ShouldNotReachHere();
2572 }
2573
2574 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2575 while (true) {
2576 if (sr_semaphore.timedwait(2)) {
2577 break;
2578 } else {
2579 // timeout
2580 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2581 if (cancelled == os::SuspendResume::SR_RUNNING) {
2582 return false;
2583 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2584 // make sure that we consume the signal on the semaphore as well
2585 sr_semaphore.wait();
2586 break;
2587 } else {
2588 ShouldNotReachHere();
2589 return false;
2590 }
2591 }
2592 }
2593
2594 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2595 return true;
2596 }
2597
2598 static void do_resume(OSThread* osthread) {
2599 assert(osthread->sr.is_suspended(), "thread should be suspended");
2600 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2601
2602 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2603 // failed to switch to WAKEUP_REQUEST
2604 ShouldNotReachHere();
2605 return;
2606 }
2607
2608 while (true) {
2609 if (sr_notify(osthread) == 0) {
2610 if (sr_semaphore.timedwait(2)) {
2611 if (osthread->sr.is_running()) {
2612 return;
2613 }
2614 }
2615 } else {
2616 ShouldNotReachHere();
2617 }
2618 }
2619
2620 guarantee(osthread->sr.is_running(), "Must be running!");
2621 }
2622
2623 ///////////////////////////////////////////////////////////////////////////////////
2624 // signal handling (except suspend/resume)
2625
2626 // This routine may be used by user applications as a "hook" to catch signals.
2627 // The user-defined signal handler must pass unrecognized signals to this
2628 // routine, and if it returns true (non-zero), then the signal handler must
2629 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2630 // routine will never retun false (zero), but instead will execute a VM panic
2631 // routine kill the process.
2632 //
2633 // If this routine returns false, it is OK to call it again. This allows
2634 // the user-defined signal handler to perform checks either before or after
2635 // the VM performs its own checks. Naturally, the user code would be making
2636 // a serious error if it tried to handle an exception (such as a null check
2637 // or breakpoint) that the VM was generating for its own correct operation.
2638 //
2639 // This routine may recognize any of the following kinds of signals:
2640 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2641 // It should be consulted by handlers for any of those signals.
2642 //
2643 // The caller of this routine must pass in the three arguments supplied
2644 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2645 // field of the structure passed to sigaction(). This routine assumes that
2646 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2647 //
2648 // Note that the VM will print warnings if it detects conflicting signal
2649 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2650 //
2651 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2652 void* ucontext,
2653 int abort_if_unrecognized);
2654
2655 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2656 assert(info != NULL && uc != NULL, "it must be old kernel");
2657 int orig_errno = errno; // Preserve errno value over signal handler.
2658 JVM_handle_bsd_signal(sig, info, uc, true);
2659 errno = orig_errno;
2660 }
2661
2662
2663 // This boolean allows users to forward their own non-matching signals
2664 // to JVM_handle_bsd_signal, harmlessly.
2665 bool os::Bsd::signal_handlers_are_installed = false;
2666
2667 // For signal-chaining
2668 bool os::Bsd::libjsig_is_loaded = false;
2669 typedef struct sigaction *(*get_signal_t)(int);
2670 get_signal_t os::Bsd::get_signal_action = NULL;
2671
2672 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2673 struct sigaction *actp = NULL;
2674
2675 if (libjsig_is_loaded) {
2676 // Retrieve the old signal handler from libjsig
2677 actp = (*get_signal_action)(sig);
2678 }
2679 if (actp == NULL) {
2680 // Retrieve the preinstalled signal handler from jvm
2681 actp = os::Posix::get_preinstalled_handler(sig);
2682 }
2683
2684 return actp;
2685 }
2686
2687 static bool call_chained_handler(struct sigaction *actp, int sig,
2688 siginfo_t *siginfo, void *context) {
2689 // Call the old signal handler
2690 if (actp->sa_handler == SIG_DFL) {
2691 // It's more reasonable to let jvm treat it as an unexpected exception
2692 // instead of taking the default action.
2693 return false;
2694 } else if (actp->sa_handler != SIG_IGN) {
2695 if ((actp->sa_flags & SA_NODEFER) == 0) {
2696 // automaticlly block the signal
2697 sigaddset(&(actp->sa_mask), sig);
2698 }
2699
2700 sa_handler_t hand;
2701 sa_sigaction_t sa;
2702 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2703 // retrieve the chained handler
2704 if (siginfo_flag_set) {
2705 sa = actp->sa_sigaction;
2706 } else {
2707 hand = actp->sa_handler;
2708 }
2709
2710 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2711 actp->sa_handler = SIG_DFL;
2712 }
2713
2714 // try to honor the signal mask
2715 sigset_t oset;
2716 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2717
2718 // call into the chained handler
2719 if (siginfo_flag_set) {
2720 (*sa)(sig, siginfo, context);
2721 } else {
2722 (*hand)(sig);
2723 }
2724
2725 // restore the signal mask
2726 pthread_sigmask(SIG_SETMASK, &oset, 0);
2727 }
2728 // Tell jvm's signal handler the signal is taken care of.
2729 return true;
2730 }
2731
2732 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2733 bool chained = false;
2734 // signal-chaining
2735 if (UseSignalChaining) {
2736 struct sigaction *actp = get_chained_signal_action(sig);
2737 if (actp != NULL) {
2738 chained = call_chained_handler(actp, sig, siginfo, context);
2739 }
2740 }
2741 return chained;
2742 }
2743
2744 // for diagnostic
2745 int sigflags[NSIG];
2746
2747 int os::Bsd::get_our_sigflags(int sig) {
2748 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2749 return sigflags[sig];
2750 }
2751
2752 void os::Bsd::set_our_sigflags(int sig, int flags) {
2753 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2754 if (sig > 0 && sig < NSIG) {
2755 sigflags[sig] = flags;
2756 }
2757 }
2758
2759 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2760 // Check for overwrite.
2761 struct sigaction oldAct;
2762 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2763
2764 void* oldhand = oldAct.sa_sigaction
2765 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2766 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2767 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2768 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2769 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2770 if (AllowUserSignalHandlers || !set_installed) {
2771 // Do not overwrite; user takes responsibility to forward to us.
2772 return;
2773 } else if (UseSignalChaining) {
2774 // save the old handler in jvm
2775 os::Posix::save_preinstalled_handler(sig, oldAct);
2776 // libjsig also interposes the sigaction() call below and saves the
2777 // old sigaction on it own.
2778 } else {
2779 fatal("Encountered unexpected pre-existing sigaction handler "
2780 "%#lx for signal %d.", (long)oldhand, sig);
2781 }
2782 }
2783
2784 struct sigaction sigAct;
2785 sigfillset(&(sigAct.sa_mask));
2786 sigAct.sa_handler = SIG_DFL;
2787 if (!set_installed) {
2788 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2789 } else {
2790 sigAct.sa_sigaction = signalHandler;
2791 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2792 }
2793 #ifdef __APPLE__
2794 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2795 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2796 // if the signal handler declares it will handle it on alternate stack.
2797 // Notice we only declare we will handle it on alt stack, but we are not
2798 // actually going to use real alt stack - this is just a workaround.
2799 // Please see ux_exception.c, method catch_mach_exception_raise for details
2800 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2801 if (sig == SIGSEGV) {
2802 sigAct.sa_flags |= SA_ONSTACK;
2803 }
2804 #endif
2805
2806 // Save flags, which are set by ours
2807 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2808 sigflags[sig] = sigAct.sa_flags;
2809
2810 int ret = sigaction(sig, &sigAct, &oldAct);
2811 assert(ret == 0, "check");
2812
2813 void* oldhand2 = oldAct.sa_sigaction
2814 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2815 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2816 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2817 }
2818
2819 // install signal handlers for signals that HotSpot needs to
2820 // handle in order to support Java-level exception handling.
2821
2822 void os::Bsd::install_signal_handlers() {
2823 if (!signal_handlers_are_installed) {
2824 signal_handlers_are_installed = true;
2825
2826 // signal-chaining
2827 typedef void (*signal_setting_t)();
2828 signal_setting_t begin_signal_setting = NULL;
2829 signal_setting_t end_signal_setting = NULL;
2830 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2831 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2832 if (begin_signal_setting != NULL) {
2833 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2834 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2835 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2836 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2837 libjsig_is_loaded = true;
2838 assert(UseSignalChaining, "should enable signal-chaining");
2839 }
2840 if (libjsig_is_loaded) {
2841 // Tell libjsig jvm is setting signal handlers
2842 (*begin_signal_setting)();
2843 }
2844
2845 set_signal_handler(SIGSEGV, true);
2846 set_signal_handler(SIGPIPE, true);
2847 set_signal_handler(SIGBUS, true);
2848 set_signal_handler(SIGILL, true);
2849 set_signal_handler(SIGFPE, true);
2850 set_signal_handler(SIGXFSZ, true);
2851
2852 #if defined(__APPLE__)
2853 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2854 // signals caught and handled by the JVM. To work around this, we reset the mach task
2855 // signal handler that's placed on our process by CrashReporter. This disables
2856 // CrashReporter-based reporting.
2857 //
2858 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2859 // on caught fatal signals.
2860 //
2861 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2862 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2863 // exception handling, while leaving the standard BSD signal handlers functional.
2864 kern_return_t kr;
2865 kr = task_set_exception_ports(mach_task_self(),
2866 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2867 MACH_PORT_NULL,
2868 EXCEPTION_STATE_IDENTITY,
2869 MACHINE_THREAD_STATE);
2870
2871 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2872 #endif
2873
2874 if (libjsig_is_loaded) {
2875 // Tell libjsig jvm finishes setting signal handlers
2876 (*end_signal_setting)();
2877 }
2878
2879 // We don't activate signal checker if libjsig is in place, we trust ourselves
2880 // and if UserSignalHandler is installed all bets are off
2881 if (CheckJNICalls) {
2882 if (libjsig_is_loaded) {
2883 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
2884 check_signals = false;
2885 }
2886 if (AllowUserSignalHandlers) {
2887 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2888 check_signals = false;
2889 }
2890 }
2891 }
2892 }
2893
2894
2895 /////
2896 // glibc on Bsd platform uses non-documented flag
2897 // to indicate, that some special sort of signal
2898 // trampoline is used.
2899 // We will never set this flag, and we should
2900 // ignore this flag in our diagnostic
2901 #ifdef SIGNIFICANT_SIGNAL_MASK
2902 #undef SIGNIFICANT_SIGNAL_MASK
2903 #endif
2904 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2905
2906 static const char* get_signal_handler_name(address handler,
2907 char* buf, int buflen) {
2908 int offset;
2909 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2910 if (found) {
2911 // skip directory names
2912 const char *p1, *p2;
2913 p1 = buf;
2914 size_t len = strlen(os::file_separator());
2915 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2916 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2917 } else {
2918 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2919 }
2920 return buf;
2921 }
2922
2923 static void print_signal_handler(outputStream* st, int sig,
2924 char* buf, size_t buflen) {
2925 struct sigaction sa;
2926
2927 sigaction(sig, NULL, &sa);
2928
2929 // See comment for SIGNIFICANT_SIGNAL_MASK define
2930 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2931
2932 st->print("%s: ", os::exception_name(sig, buf, buflen));
2933
2934 address handler = (sa.sa_flags & SA_SIGINFO)
2935 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2936 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2937
2938 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2939 st->print("SIG_DFL");
2940 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2941 st->print("SIG_IGN");
2942 } else {
2943 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2944 }
2945
2946 st->print(", sa_mask[0]=");
2947 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2948
2949 address rh = VMError::get_resetted_sighandler(sig);
2950 // May be, handler was resetted by VMError?
2951 if (rh != NULL) {
2952 handler = rh;
2953 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2954 }
2955
2956 st->print(", sa_flags=");
2957 os::Posix::print_sa_flags(st, sa.sa_flags);
2958
2959 // Check: is it our handler?
2960 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2961 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2962 // It is our signal handler
2963 // check for flags, reset system-used one!
2964 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2965 st->print(
2966 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2967 os::Bsd::get_our_sigflags(sig));
2968 }
2969 }
2970 st->cr();
2971 }
2972
2973
2974 #define DO_SIGNAL_CHECK(sig) \
2975 do { \
2976 if (!sigismember(&check_signal_done, sig)) { \
2977 os::Bsd::check_signal_handler(sig); \
2978 } \
2979 } while (0)
2980
2981 // This method is a periodic task to check for misbehaving JNI applications
2982 // under CheckJNI, we can add any periodic checks here
2983
2984 void os::run_periodic_checks() {
2985
2986 if (check_signals == false) return;
2987
2988 // SEGV and BUS if overridden could potentially prevent
2989 // generation of hs*.log in the event of a crash, debugging
2990 // such a case can be very challenging, so we absolutely
2991 // check the following for a good measure:
2992 DO_SIGNAL_CHECK(SIGSEGV);
2993 DO_SIGNAL_CHECK(SIGILL);
2994 DO_SIGNAL_CHECK(SIGFPE);
2995 DO_SIGNAL_CHECK(SIGBUS);
2996 DO_SIGNAL_CHECK(SIGPIPE);
2997 DO_SIGNAL_CHECK(SIGXFSZ);
2998
2999
3000 // ReduceSignalUsage allows the user to override these handlers
3001 // see comments at the very top and jvm_md.h
3002 if (!ReduceSignalUsage) {
3003 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3004 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3005 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3006 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3007 }
3008
3009 DO_SIGNAL_CHECK(SR_signum);
3010 }
3011
3012 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3013
3014 static os_sigaction_t os_sigaction = NULL;
3015
3016 void os::Bsd::check_signal_handler(int sig) {
3017 char buf[O_BUFLEN];
3018 address jvmHandler = NULL;
3019
3020
3021 struct sigaction act;
3022 if (os_sigaction == NULL) {
3023 // only trust the default sigaction, in case it has been interposed
3024 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3025 if (os_sigaction == NULL) return;
3026 }
3027
3028 os_sigaction(sig, (struct sigaction*)NULL, &act);
3029
3030
3031 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3032
3033 address thisHandler = (act.sa_flags & SA_SIGINFO)
3034 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3035 : CAST_FROM_FN_PTR(address, act.sa_handler);
3036
3037
3038 switch (sig) {
3039 case SIGSEGV:
3040 case SIGBUS:
3041 case SIGFPE:
3042 case SIGPIPE:
3043 case SIGILL:
3044 case SIGXFSZ:
3045 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3046 break;
3047
3048 case SHUTDOWN1_SIGNAL:
3049 case SHUTDOWN2_SIGNAL:
3050 case SHUTDOWN3_SIGNAL:
3051 case BREAK_SIGNAL:
3052 jvmHandler = (address)user_handler();
3053 break;
3054
3055 default:
3056 if (sig == SR_signum) {
3057 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3058 } else {
3059 return;
3060 }
3061 break;
3062 }
3063
3064 if (thisHandler != jvmHandler) {
3065 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3066 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3067 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3068 // No need to check this sig any longer
3069 sigaddset(&check_signal_done, sig);
3070 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3071 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3072 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3073 exception_name(sig, buf, O_BUFLEN));
3074 }
3075 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3076 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3077 tty->print("expected:");
3078 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3079 tty->cr();
3080 tty->print(" found:");
3081 os::Posix::print_sa_flags(tty, act.sa_flags);
3082 tty->cr();
3083 // No need to check this sig any longer
3084 sigaddset(&check_signal_done, sig);
3085 }
3086
3087 // Dump all the signal
3088 if (sigismember(&check_signal_done, sig)) {
3089 print_signal_handlers(tty, buf, O_BUFLEN);
3090 }
3091 }
3092
3093 extern void report_error(char* file_name, int line_no, char* title,
3094 char* format, ...);
3095
3096 // this is called _before_ the most of global arguments have been parsed
3097 void os::init(void) {
3098 char dummy; // used to get a guess on initial stack address
3099
3100 clock_tics_per_sec = CLK_TCK;
3101
3102 init_random(1234567);
3103
3104 Bsd::set_page_size(getpagesize());
3105 if (Bsd::page_size() == -1) {
3106 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3107 }
3108 init_page_sizes((size_t) Bsd::page_size());
3109
3110 Bsd::initialize_system_info();
3111
3112 // _main_thread points to the thread that created/loaded the JVM.
3113 Bsd::_main_thread = pthread_self();
3114
3115 Bsd::clock_init();
3116 initial_time_count = javaTimeNanos();
3117
3118 os::Posix::init();
3119 }
3120
3121 // To install functions for atexit system call
3122 extern "C" {
3123 static void perfMemory_exit_helper() {
3124 perfMemory_exit();
3125 }
3126 }
3127
3128 // this is called _after_ the global arguments have been parsed
3129 jint os::init_2(void) {
3130
3131 // This could be set after os::Posix::init() but all platforms
3132 // have to set it the same so we have to mirror Solaris.
3133 DEBUG_ONLY(os::set_mutex_init_done();)
3134
3135 os::Posix::init_2();
3136
3137 // initialize suspend/resume support - must do this before signal_sets_init()
3138 if (SR_initialize() != 0) {
3139 perror("SR_initialize failed");
3140 return JNI_ERR;
3141 }
3142
3143 Bsd::signal_sets_init();
3144 Bsd::install_signal_handlers();
3145 // Initialize data for jdk.internal.misc.Signal
3146 if (!ReduceSignalUsage) {
3147 jdk_misc_signal_init();
3148 }
3149
3150 // Check and sets minimum stack sizes against command line options
3151 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3152 return JNI_ERR;
3153 }
3154
3155 if (MaxFDLimit) {
3156 // set the number of file descriptors to max. print out error
3157 // if getrlimit/setrlimit fails but continue regardless.
3158 struct rlimit nbr_files;
3159 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3160 if (status != 0) {
3161 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3162 } else {
3163 nbr_files.rlim_cur = nbr_files.rlim_max;
3164
3165 #ifdef __APPLE__
3166 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3167 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3168 // be used instead
3169 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3170 #endif
3171
3172 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3173 if (status != 0) {
3174 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3175 }
3176 }
3177 }
3178
3179 // at-exit methods are called in the reverse order of their registration.
3180 // atexit functions are called on return from main or as a result of a
3181 // call to exit(3C). There can be only 32 of these functions registered
3182 // and atexit() does not set errno.
3183
3184 if (PerfAllowAtExitRegistration) {
3185 // only register atexit functions if PerfAllowAtExitRegistration is set.
3186 // atexit functions can be delayed until process exit time, which
3187 // can be problematic for embedded VM situations. Embedded VMs should
3188 // call DestroyJavaVM() to assure that VM resources are released.
3189
3190 // note: perfMemory_exit_helper atexit function may be removed in
3191 // the future if the appropriate cleanup code can be added to the
3192 // VM_Exit VMOperation's doit method.
3193 if (atexit(perfMemory_exit_helper) != 0) {
3194 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3195 }
3196 }
3197
3198 // initialize thread priority policy
3199 prio_init();
3200
3201 #ifdef __APPLE__
3202 // dynamically link to objective c gc registration
3203 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3204 if (handleLibObjc != NULL) {
3205 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3206 }
3207 #endif
3208
3209 return JNI_OK;
3210 }
3211
3212 // Mark the polling page as unreadable
3213 void os::make_polling_page_unreadable(void) {
3214 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3215 fatal("Could not disable polling page");
3216 }
3217 }
3218
3219 // Mark the polling page as readable
3220 void os::make_polling_page_readable(void) {
3221 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3222 fatal("Could not enable polling page");
3223 }
3224 }
3225
3226 int os::active_processor_count() {
3227 // User has overridden the number of active processors
3228 if (ActiveProcessorCount > 0) {
3229 log_trace(os)("active_processor_count: "
3230 "active processor count set by user : %d",
3231 ActiveProcessorCount);
3232 return ActiveProcessorCount;
3233 }
3234
3235 return _processor_count;
3236 }
3237
3238 #ifdef __APPLE__
3239 uint os::processor_id() {
3240 // Get the initial APIC id and return the associated processor id. The initial APIC
3241 // id is limited to 8-bits, which means we can have at most 256 unique APIC ids. If
3242 // the system has more processors (or the initial APIC ids are discontiguous) the
3243 // APIC id will be truncated and more than one processor will potentially share the
3244 // same processor id. This is not optimal, but unlikely to happen in practice. Should
3245 // this become a real problem we could switch to using x2APIC ids, which are 32-bit
3246 // wide. However, note that x2APIC is Intel-specific, and the wider number space
3247 // would require a more complicated mapping approach.
3248 uint eax = 0x1;
3249 uint ebx;
3250 uint ecx = 0;
3251 uint edx;
3252
3253 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3254
3255 uint apic_id = (ebx >> 24) & (processor_id_map_size - 1);
3256 int processor_id = Atomic::load(&processor_id_map[apic_id]);
3257
3258 while (processor_id < 0) {
3259 // Assign processor id to APIC id
3260 processor_id = Atomic::cmpxchg(&processor_id_map[apic_id], processor_id_unassigned, processor_id_assigning);
3261 if (processor_id == processor_id_unassigned) {
3262 processor_id = (Atomic::add(&processor_id_next, 1) - 1) % os::processor_count();
3263 Atomic::store(&processor_id_map[apic_id], processor_id);
3264 }
3265 }
3266
3267 assert(processor_id >= 0 && processor_id < os::processor_count(), "invalid processor id");
3268
3269 return (uint)processor_id;
3270 }
3271 #endif
3272
3273 void os::set_native_thread_name(const char *name) {
3274 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3275 // This is only supported in Snow Leopard and beyond
3276 if (name != NULL) {
3277 // Add a "Java: " prefix to the name
3278 char buf[MAXTHREADNAMESIZE];
3279 snprintf(buf, sizeof(buf), "Java: %s", name);
3280 pthread_setname_np(buf);
3281 }
3282 #endif
3283 }
3284
3285 bool os::bind_to_processor(uint processor_id) {
3286 // Not yet implemented.
3287 return false;
3288 }
3289
3290 void os::SuspendedThreadTask::internal_do_task() {
3291 if (do_suspend(_thread->osthread())) {
3292 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3293 do_task(context);
3294 do_resume(_thread->osthread());
3295 }
3296 }
3297
3298 ////////////////////////////////////////////////////////////////////////////////
3299 // debug support
3300
3301 bool os::find(address addr, outputStream* st) {
3302 Dl_info dlinfo;
3303 memset(&dlinfo, 0, sizeof(dlinfo));
3304 if (dladdr(addr, &dlinfo) != 0) {
3305 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3306 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3307 st->print("%s+%#x", dlinfo.dli_sname,
3308 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3309 } else if (dlinfo.dli_fbase != NULL) {
3310 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3311 } else {
3312 st->print("<absolute address>");
3313 }
3314 if (dlinfo.dli_fname != NULL) {
3315 st->print(" in %s", dlinfo.dli_fname);
3316 }
3317 if (dlinfo.dli_fbase != NULL) {
3318 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3319 }
3320 st->cr();
3321
3322 if (Verbose) {
3323 // decode some bytes around the PC
3324 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3325 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3326 address lowest = (address) dlinfo.dli_sname;
3327 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3328 if (begin < lowest) begin = lowest;
3329 Dl_info dlinfo2;
3330 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3331 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3332 end = (address) dlinfo2.dli_saddr;
3333 }
3334 Disassembler::decode(begin, end, st);
3335 }
3336 return true;
3337 }
3338 return false;
3339 }
3340
3341 ////////////////////////////////////////////////////////////////////////////////
3342 // misc
3343
3344 // This does not do anything on Bsd. This is basically a hook for being
3345 // able to use structured exception handling (thread-local exception filters)
3346 // on, e.g., Win32.
3347 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3348 const methodHandle& method, JavaCallArguments* args,
3349 Thread* thread) {
3350 f(value, method, args, thread);
3351 }
3352
3353 void os::print_statistics() {
3354 }
3355
3356 bool os::message_box(const char* title, const char* message) {
3357 int i;
3358 fdStream err(defaultStream::error_fd());
3359 for (i = 0; i < 78; i++) err.print_raw("=");
3360 err.cr();
3361 err.print_raw_cr(title);
3362 for (i = 0; i < 78; i++) err.print_raw("-");
3363 err.cr();
3364 err.print_raw_cr(message);
3365 for (i = 0; i < 78; i++) err.print_raw("=");
3366 err.cr();
3367
3368 char buf[16];
3369 // Prevent process from exiting upon "read error" without consuming all CPU
3370 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3371
3372 return buf[0] == 'y' || buf[0] == 'Y';
3373 }
3374
3375 static inline struct timespec get_mtime(const char* filename) {
3376 struct stat st;
3377 int ret = os::stat(filename, &st);
3378 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3379 #ifdef __APPLE__
3380 return st.st_mtimespec;
3381 #else
3382 return st.st_mtim;
3383 #endif
3384 }
3385
3386 int os::compare_file_modified_times(const char* file1, const char* file2) {
3387 struct timespec filetime1 = get_mtime(file1);
3388 struct timespec filetime2 = get_mtime(file2);
3389 int diff = filetime1.tv_sec - filetime2.tv_sec;
3390 if (diff == 0) {
3391 return filetime1.tv_nsec - filetime2.tv_nsec;
3392 }
3393 return diff;
3394 }
3395
3396 // Is a (classpath) directory empty?
3397 bool os::dir_is_empty(const char* path) {
3398 DIR *dir = NULL;
3399 struct dirent *ptr;
3400
3401 dir = opendir(path);
3402 if (dir == NULL) return true;
3403
3404 // Scan the directory
3405 bool result = true;
3406 while (result && (ptr = readdir(dir)) != NULL) {
3407 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3408 result = false;
3409 }
3410 }
3411 closedir(dir);
3412 return result;
3413 }
3414
3415 // This code originates from JDK's sysOpen and open64_w
3416 // from src/solaris/hpi/src/system_md.c
3417
3418 int os::open(const char *path, int oflag, int mode) {
3419 if (strlen(path) > MAX_PATH - 1) {
3420 errno = ENAMETOOLONG;
3421 return -1;
3422 }
3423 int fd;
3424
3425 fd = ::open(path, oflag, mode);
3426 if (fd == -1) return -1;
3427
3428 // If the open succeeded, the file might still be a directory
3429 {
3430 struct stat buf;
3431 int ret = ::fstat(fd, &buf);
3432 int st_mode = buf.st_mode;
3433
3434 if (ret != -1) {
3435 if ((st_mode & S_IFMT) == S_IFDIR) {
3436 errno = EISDIR;
3437 ::close(fd);
3438 return -1;
3439 }
3440 } else {
3441 ::close(fd);
3442 return -1;
3443 }
3444 }
3445
3446 // All file descriptors that are opened in the JVM and not
3447 // specifically destined for a subprocess should have the
3448 // close-on-exec flag set. If we don't set it, then careless 3rd
3449 // party native code might fork and exec without closing all
3450 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3451 // UNIXProcess.c), and this in turn might:
3452 //
3453 // - cause end-of-file to fail to be detected on some file
3454 // descriptors, resulting in mysterious hangs, or
3455 //
3456 // - might cause an fopen in the subprocess to fail on a system
3457 // suffering from bug 1085341.
3458 //
3459 // (Yes, the default setting of the close-on-exec flag is a Unix
3460 // design flaw)
3461 //
3462 // See:
3463 // 1085341: 32-bit stdio routines should support file descriptors >255
3464 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3465 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3466 //
3467 #ifdef FD_CLOEXEC
3468 {
3469 int flags = ::fcntl(fd, F_GETFD);
3470 if (flags != -1) {
3471 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3472 }
3473 }
3474 #endif
3475
3476 return fd;
3477 }
3478
3479
3480 // create binary file, rewriting existing file if required
3481 int os::create_binary_file(const char* path, bool rewrite_existing) {
3482 int oflags = O_WRONLY | O_CREAT;
3483 if (!rewrite_existing) {
3484 oflags |= O_EXCL;
3485 }
3486 return ::open(path, oflags, S_IREAD | S_IWRITE);
3487 }
3488
3489 // return current position of file pointer
3490 jlong os::current_file_offset(int fd) {
3491 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3492 }
3493
3494 // move file pointer to the specified offset
3495 jlong os::seek_to_file_offset(int fd, jlong offset) {
3496 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3497 }
3498
3499 // This code originates from JDK's sysAvailable
3500 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3501
3502 int os::available(int fd, jlong *bytes) {
3503 jlong cur, end;
3504 int mode;
3505 struct stat buf;
3506
3507 if (::fstat(fd, &buf) >= 0) {
3508 mode = buf.st_mode;
3509 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3510 int n;
3511 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3512 *bytes = n;
3513 return 1;
3514 }
3515 }
3516 }
3517 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3518 return 0;
3519 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3520 return 0;
3521 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3522 return 0;
3523 }
3524 *bytes = end - cur;
3525 return 1;
3526 }
3527
3528 // Map a block of memory.
3529 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3530 char *addr, size_t bytes, bool read_only,
3531 bool allow_exec) {
3532 int prot;
3533 int flags;
3534
3535 if (read_only) {
3536 prot = PROT_READ;
3537 flags = MAP_SHARED;
3538 } else {
3539 prot = PROT_READ | PROT_WRITE;
3540 flags = MAP_PRIVATE;
3541 }
3542
3543 if (allow_exec) {
3544 prot |= PROT_EXEC;
3545 }
3546
3547 if (addr != NULL) {
3548 flags |= MAP_FIXED;
3549 }
3550
3551 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3552 fd, file_offset);
3553 if (mapped_address == MAP_FAILED) {
3554 return NULL;
3555 }
3556 return mapped_address;
3557 }
3558
3559
3560 // Remap a block of memory.
3561 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3562 char *addr, size_t bytes, bool read_only,
3563 bool allow_exec) {
3564 // same as map_memory() on this OS
3565 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3566 allow_exec);
3567 }
3568
3569
3570 // Unmap a block of memory.
3571 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3572 return munmap(addr, bytes) == 0;
3573 }
3574
3575 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3576 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3577 // of a thread.
3578 //
3579 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3580 // the fast estimate available on the platform.
3581
3582 jlong os::current_thread_cpu_time() {
3583 #ifdef __APPLE__
3584 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3585 #else
3586 Unimplemented();
3587 return 0;
3588 #endif
3589 }
3590
3591 jlong os::thread_cpu_time(Thread* thread) {
3592 #ifdef __APPLE__
3593 return os::thread_cpu_time(thread, true /* user + sys */);
3594 #else
3595 Unimplemented();
3596 return 0;
3597 #endif
3598 }
3599
3600 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3601 #ifdef __APPLE__
3602 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3603 #else
3604 Unimplemented();
3605 return 0;
3606 #endif
3607 }
3608
3609 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3610 #ifdef __APPLE__
3611 struct thread_basic_info tinfo;
3612 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3613 kern_return_t kr;
3614 thread_t mach_thread;
3615
3616 mach_thread = thread->osthread()->thread_id();
3617 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3618 if (kr != KERN_SUCCESS) {
3619 return -1;
3620 }
3621
3622 if (user_sys_cpu_time) {
3623 jlong nanos;
3624 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3625 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3626 return nanos;
3627 } else {
3628 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3629 }
3630 #else
3631 Unimplemented();
3632 return 0;
3633 #endif
3634 }
3635
3636
3637 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3638 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3639 info_ptr->may_skip_backward = false; // elapsed time not wall time
3640 info_ptr->may_skip_forward = false; // elapsed time not wall time
3641 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3642 }
3643
3644 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3645 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3646 info_ptr->may_skip_backward = false; // elapsed time not wall time
3647 info_ptr->may_skip_forward = false; // elapsed time not wall time
3648 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3649 }
3650
3651 bool os::is_thread_cpu_time_supported() {
3652 #ifdef __APPLE__
3653 return true;
3654 #else
3655 return false;
3656 #endif
3657 }
3658
3659 // System loadavg support. Returns -1 if load average cannot be obtained.
3660 // Bsd doesn't yet have a (official) notion of processor sets,
3661 // so just return the system wide load average.
3662 int os::loadavg(double loadavg[], int nelem) {
3663 return ::getloadavg(loadavg, nelem);
3664 }
3665
3666 void os::pause() {
3667 char filename[MAX_PATH];
3668 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3669 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
3670 } else {
3671 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3672 }
3673
3674 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3675 if (fd != -1) {
3676 struct stat buf;
3677 ::close(fd);
3678 while (::stat(filename, &buf) == 0) {
3679 (void)::poll(NULL, 0, 100);
3680 }
3681 } else {
3682 jio_fprintf(stderr,
3683 "Could not open pause file '%s', continuing immediately.\n", filename);
3684 }
3685 }
3686
3687 // Darwin has no "environ" in a dynamic library.
3688 #ifdef __APPLE__
3689 #include <crt_externs.h>
3690 #define environ (*_NSGetEnviron())
3691 #else
3692 extern char** environ;
3693 #endif
3694
3695 // Run the specified command in a separate process. Return its exit value,
3696 // or -1 on failure (e.g. can't fork a new process).
3697 // Unlike system(), this function can be called from signal handler. It
3698 // doesn't block SIGINT et al.
3699 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3700 const char * argv[4] = {"sh", "-c", cmd, NULL};
3701
3702 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3703 // pthread_atfork handlers and reset pthread library. All we need is a
3704 // separate process to execve. Make a direct syscall to fork process.
3705 // On IA64 there's no fork syscall, we have to use fork() and hope for
3706 // the best...
3707 pid_t pid = fork();
3708
3709 if (pid < 0) {
3710 // fork failed
3711 return -1;
3712
3713 } else if (pid == 0) {
3714 // child process
3715
3716 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3717 // first to kill every thread on the thread list. Because this list is
3718 // not reset by fork() (see notes above), execve() will instead kill
3719 // every thread in the parent process. We know this is the only thread
3720 // in the new process, so make a system call directly.
3721 // IA64 should use normal execve() from glibc to match the glibc fork()
3722 // above.
3723 execve("/bin/sh", (char* const*)argv, environ);
3724
3725 // execve failed
3726 _exit(-1);
3727
3728 } else {
3729 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3730 // care about the actual exit code, for now.
3731
3732 int status;
3733
3734 // Wait for the child process to exit. This returns immediately if
3735 // the child has already exited. */
3736 while (waitpid(pid, &status, 0) < 0) {
3737 switch (errno) {
3738 case ECHILD: return 0;
3739 case EINTR: break;
3740 default: return -1;
3741 }
3742 }
3743
3744 if (WIFEXITED(status)) {
3745 // The child exited normally; get its exit code.
3746 return WEXITSTATUS(status);
3747 } else if (WIFSIGNALED(status)) {
3748 // The child exited because of a signal
3749 // The best value to return is 0x80 + signal number,
3750 // because that is what all Unix shells do, and because
3751 // it allows callers to distinguish between process exit and
3752 // process death by signal.
3753 return 0x80 + WTERMSIG(status);
3754 } else {
3755 // Unknown exit code; pass it through
3756 return status;
3757 }
3758 }
3759 }
3760
3761 // Get the kern.corefile setting, or otherwise the default path to the core file
3762 // Returns the length of the string
3763 int os::get_core_path(char* buffer, size_t bufferSize) {
3764 int n = 0;
3765 #ifdef __APPLE__
3766 char coreinfo[MAX_PATH];
3767 size_t sz = sizeof(coreinfo);
3768 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0);
3769 if (ret == 0) {
3770 char *pid_pos = strstr(coreinfo, "%P");
3771 // skip over the "%P" to preserve any optional custom user pattern
3772 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : "";
3773
3774 if (pid_pos != NULL) {
3775 *pid_pos = '\0';
3776 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail);
3777 } else {
3778 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo);
3779 }
3780 } else
3781 #endif
3782 {
3783 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id());
3784 }
3785 // Truncate if theoretical string was longer than bufferSize
3786 n = MIN2(n, (int)bufferSize);
3787
3788 return n;
3789 }
3790
3791 bool os::supports_map_sync() {
3792 return false;
3793 }
3794
3795 #ifndef PRODUCT
3796 void TestReserveMemorySpecial_test() {
3797 // No tests available for this platform
3798 }
3799 #endif
3800
3801 bool os::start_debugging(char *buf, int buflen) {
3802 int len = (int)strlen(buf);
3803 char *p = &buf[len];
3804
3805 jio_snprintf(p, buflen-len,
3806 "\n\n"
3807 "Do you want to debug the problem?\n\n"
3808 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3809 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3810 "Otherwise, press RETURN to abort...",
3811 os::current_process_id(), os::current_process_id(),
3812 os::current_thread_id(), os::current_thread_id());
3813
3814 bool yes = os::message_box("Unexpected Error", buf);
3815
3816 if (yes) {
3817 // yes, user asked VM to launch debugger
3818 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3819 os::current_process_id(), os::current_process_id());
3820
3821 os::fork_and_exec(buf);
3822 yes = false;
3823 }
3824 return yes;
3825 }