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