1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_bsd.inline.hpp"
40 #include "os_posix.inline.hpp"
41 #include "os_share_bsd.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm_misc.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/atomic.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.inline.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/orderAccess.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 static pid_t _initial_pid = 0;
139
140 // Signal number used to suspend/resume a thread
141
142 // do not use any signal number less than SIGSEGV, see 4355769
143 static int SR_signum = SIGUSR2;
144 sigset_t SR_sigset;
145
146
147 ////////////////////////////////////////////////////////////////////////////////
148 // utility functions
149
150 static int SR_initialize();
151
152 julong os::available_memory() {
153 return Bsd::available_memory();
154 }
155
156 // available here means free
157 julong os::Bsd::available_memory() {
158 uint64_t available = physical_memory() >> 2;
159 #ifdef __APPLE__
160 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
161 vm_statistics64_data_t vmstat;
162 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
163 (host_info64_t)&vmstat, &count);
164 assert(kerr == KERN_SUCCESS,
165 "host_statistics64 failed - check mach_host_self() and count");
166 if (kerr == KERN_SUCCESS) {
167 available = vmstat.free_count * os::vm_page_size();
168 }
169 #endif
170 return available;
171 }
172
173 julong os::physical_memory() {
174 return Bsd::physical_memory();
175 }
176
177 // Return true if user is running as root.
178
179 bool os::have_special_privileges() {
180 static bool init = false;
181 static bool privileges = false;
182 if (!init) {
183 privileges = (getuid() != geteuid()) || (getgid() != getegid());
184 init = true;
185 }
186 return privileges;
187 }
188
189
190
191 // Cpu architecture string
192 #if defined(ZERO)
193 static char cpu_arch[] = ZERO_LIBARCH;
194 #elif defined(IA64)
195 static char cpu_arch[] = "ia64";
196 #elif defined(IA32)
197 static char cpu_arch[] = "i386";
198 #elif defined(AMD64)
199 static char cpu_arch[] = "amd64";
200 #elif defined(ARM)
201 static char cpu_arch[] = "arm";
202 #elif defined(PPC32)
203 static char cpu_arch[] = "ppc";
204 #elif defined(SPARC)
205 #ifdef _LP64
206 static char cpu_arch[] = "sparcv9";
207 #else
208 static char cpu_arch[] = "sparc";
209 #endif
210 #else
211 #error Add appropriate cpu_arch setting
212 #endif
213
214 // Compiler variant
215 #ifdef COMPILER2
216 #define COMPILER_VARIANT "server"
217 #else
218 #define COMPILER_VARIANT "client"
219 #endif
220
221
222 void os::Bsd::initialize_system_info() {
223 int mib[2];
224 size_t len;
225 int cpu_val;
226 julong mem_val;
227
228 // get processors count via hw.ncpus sysctl
229 mib[0] = CTL_HW;
230 mib[1] = HW_NCPU;
231 len = sizeof(cpu_val);
232 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
233 assert(len == sizeof(cpu_val), "unexpected data size");
234 set_processor_count(cpu_val);
235 } else {
236 set_processor_count(1); // fallback
237 }
238
239 // get physical memory via hw.memsize sysctl (hw.memsize is used
240 // since it returns a 64 bit value)
241 mib[0] = CTL_HW;
242
243 #if defined (HW_MEMSIZE) // Apple
244 mib[1] = HW_MEMSIZE;
245 #elif defined(HW_PHYSMEM) // Most of BSD
246 mib[1] = HW_PHYSMEM;
247 #elif defined(HW_REALMEM) // Old FreeBSD
248 mib[1] = HW_REALMEM;
249 #else
250 #error No ways to get physmem
251 #endif
252
253 len = sizeof(mem_val);
254 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
255 assert(len == sizeof(mem_val), "unexpected data size");
256 _physical_memory = mem_val;
257 } else {
258 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
259 }
260
261 #ifdef __OpenBSD__
262 {
263 // limit _physical_memory memory view on OpenBSD since
264 // datasize rlimit restricts us anyway.
265 struct rlimit limits;
266 getrlimit(RLIMIT_DATA, &limits);
267 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
268 }
269 #endif
270 }
271
272 #ifdef __APPLE__
273 static const char *get_home() {
274 const char *home_dir = ::getenv("HOME");
275 if ((home_dir == NULL) || (*home_dir == '\0')) {
276 struct passwd *passwd_info = getpwuid(geteuid());
277 if (passwd_info != NULL) {
278 home_dir = passwd_info->pw_dir;
279 }
280 }
281
282 return home_dir;
283 }
284 #endif
285
286 void os::init_system_properties_values() {
287 // The next steps are taken in the product version:
288 //
289 // Obtain the JAVA_HOME value from the location of libjvm.so.
290 // This library should be located at:
291 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
292 //
293 // If "/jre/lib/" appears at the right place in the path, then we
294 // assume libjvm.so is installed in a JDK and we use this path.
295 //
296 // Otherwise exit with message: "Could not create the Java virtual machine."
297 //
298 // The following extra steps are taken in the debugging version:
299 //
300 // If "/jre/lib/" does NOT appear at the right place in the path
301 // instead of exit check for $JAVA_HOME environment variable.
302 //
303 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
304 // then we append a fake suffix "hotspot/libjvm.so" to this path so
305 // it looks like libjvm.so is installed there
306 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
307 //
308 // Otherwise exit.
309 //
310 // Important note: if the location of libjvm.so changes this
311 // code needs to be changed accordingly.
312
313 // See ld(1):
314 // The linker uses the following search paths to locate required
315 // shared libraries:
316 // 1: ...
317 // ...
318 // 7: The default directories, normally /lib and /usr/lib.
319 #ifndef DEFAULT_LIBPATH
320 #ifndef OVERRIDE_LIBPATH
321 #define DEFAULT_LIBPATH "/lib:/usr/lib"
322 #else
323 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
324 #endif
325 #endif
326
327 // Base path of extensions installed on the system.
328 #define SYS_EXT_DIR "/usr/java/packages"
329 #define EXTENSIONS_DIR "/lib/ext"
330
331 #ifndef __APPLE__
332
333 // Buffer that fits several sprintfs.
334 // Note that the space for the colon and the trailing null are provided
335 // by the nulls included by the sizeof operator.
336 const size_t bufsize =
337 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
338 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
339 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
340
341 // sysclasspath, java_home, dll_dir
342 {
343 char *pslash;
344 os::jvm_path(buf, bufsize);
345
346 // Found the full path to libjvm.so.
347 // Now cut the path to <java_home>/jre if we can.
348 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
349 pslash = strrchr(buf, '/');
350 if (pslash != NULL) {
351 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
352 }
353 Arguments::set_dll_dir(buf);
354
355 if (pslash != NULL) {
356 pslash = strrchr(buf, '/');
357 if (pslash != NULL) {
358 *pslash = '\0'; // Get rid of /<arch>.
359 pslash = strrchr(buf, '/');
360 if (pslash != NULL) {
361 *pslash = '\0'; // Get rid of /lib.
362 }
363 }
364 }
365 Arguments::set_java_home(buf);
366 if (!set_boot_path('/', ':')) {
367 vm_exit_during_initialization("Failed setting boot class path.", NULL);
368 }
369 }
370
371 // Where to look for native libraries.
372 //
373 // Note: Due to a legacy implementation, most of the library path
374 // is set in the launcher. This was to accomodate linking restrictions
375 // on legacy Bsd implementations (which are no longer supported).
376 // Eventually, all the library path setting will be done here.
377 //
378 // However, to prevent the proliferation of improperly built native
379 // libraries, the new path component /usr/java/packages is added here.
380 // Eventually, all the library path setting will be done here.
381 {
382 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
383 // should always exist (until the legacy problem cited above is
384 // addressed).
385 const char *v = ::getenv("LD_LIBRARY_PATH");
386 const char *v_colon = ":";
387 if (v == NULL) { v = ""; v_colon = ""; }
388 // That's +1 for the colon and +1 for the trailing '\0'.
389 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
390 strlen(v) + 1 +
391 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
392 mtInternal);
393 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
394 Arguments::set_library_path(ld_library_path);
395 FREE_C_HEAP_ARRAY(char, ld_library_path);
396 }
397
398 // Extensions directories.
399 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
400 Arguments::set_ext_dirs(buf);
401
402 FREE_C_HEAP_ARRAY(char, buf);
403
404 #else // __APPLE__
405
406 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
407 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
408
409 const char *user_home_dir = get_home();
410 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
411 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
412 sizeof(SYS_EXTENSIONS_DIRS);
413
414 // Buffer that fits several sprintfs.
415 // Note that the space for the colon and the trailing null are provided
416 // by the nulls included by the sizeof operator.
417 const size_t bufsize =
418 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
419 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
420 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
421
422 // sysclasspath, java_home, dll_dir
423 {
424 char *pslash;
425 os::jvm_path(buf, bufsize);
426
427 // Found the full path to libjvm.so.
428 // Now cut the path to <java_home>/jre if we can.
429 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
430 pslash = strrchr(buf, '/');
431 if (pslash != NULL) {
432 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
433 }
434 #ifdef STATIC_BUILD
435 strcat(buf, "/lib");
436 #endif
437
438 Arguments::set_dll_dir(buf);
439
440 if (pslash != NULL) {
441 pslash = strrchr(buf, '/');
442 if (pslash != NULL) {
443 *pslash = '\0'; // Get rid of /lib.
444 }
445 }
446 Arguments::set_java_home(buf);
447 set_boot_path('/', ':');
448 }
449
450 // Where to look for native libraries.
451 //
452 // Note: Due to a legacy implementation, most of the library path
453 // is set in the launcher. This was to accomodate linking restrictions
454 // on legacy Bsd implementations (which are no longer supported).
455 // Eventually, all the library path setting will be done here.
456 //
457 // However, to prevent the proliferation of improperly built native
458 // libraries, the new path component /usr/java/packages is added here.
459 // Eventually, all the library path setting will be done here.
460 {
461 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
462 // should always exist (until the legacy problem cited above is
463 // addressed).
464 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
465 // can specify a directory inside an app wrapper
466 const char *l = ::getenv("JAVA_LIBRARY_PATH");
467 const char *l_colon = ":";
468 if (l == NULL) { l = ""; l_colon = ""; }
469
470 const char *v = ::getenv("DYLD_LIBRARY_PATH");
471 const char *v_colon = ":";
472 if (v == NULL) { v = ""; v_colon = ""; }
473
474 // Apple's Java6 has "." at the beginning of java.library.path.
475 // OpenJDK on Windows has "." at the end of java.library.path.
476 // OpenJDK on Linux and Solaris don't have "." in java.library.path
477 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
478 // "." is appended to the end of java.library.path. Yes, this
479 // could cause a change in behavior, but Apple's Java6 behavior
480 // can be achieved by putting "." at the beginning of the
481 // JAVA_LIBRARY_PATH environment variable.
482 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
483 strlen(v) + 1 + strlen(l) + 1 +
484 system_ext_size + 3,
485 mtInternal);
486 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
487 v, v_colon, l, l_colon, user_home_dir);
488 Arguments::set_library_path(ld_library_path);
489 FREE_C_HEAP_ARRAY(char, ld_library_path);
490 }
491
492 // Extensions directories.
493 //
494 // Note that the space for the colon and the trailing null are provided
495 // by the nulls included by the sizeof operator (so actually one byte more
496 // than necessary is allocated).
497 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
498 user_home_dir, Arguments::get_java_home());
499 Arguments::set_ext_dirs(buf);
500
501 FREE_C_HEAP_ARRAY(char, buf);
502
503 #undef SYS_EXTENSIONS_DIR
504 #undef SYS_EXTENSIONS_DIRS
505
506 #endif // __APPLE__
507
508 #undef SYS_EXT_DIR
509 #undef EXTENSIONS_DIR
510 }
511
512 ////////////////////////////////////////////////////////////////////////////////
513 // breakpoint support
514
515 void os::breakpoint() {
516 BREAKPOINT;
517 }
518
519 extern "C" void breakpoint() {
520 // use debugger to set breakpoint here
521 }
522
523 ////////////////////////////////////////////////////////////////////////////////
524 // signal support
525
526 debug_only(static bool signal_sets_initialized = false);
527 static sigset_t unblocked_sigs, vm_sigs;
528
529 void os::Bsd::signal_sets_init() {
530 // Should also have an assertion stating we are still single-threaded.
531 assert(!signal_sets_initialized, "Already initialized");
532 // Fill in signals that are necessarily unblocked for all threads in
533 // the VM. Currently, we unblock the following signals:
534 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
535 // by -Xrs (=ReduceSignalUsage));
536 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
537 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
538 // the dispositions or masks wrt these signals.
539 // Programs embedding the VM that want to use the above signals for their
540 // own purposes must, at this time, use the "-Xrs" option to prevent
541 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
542 // (See bug 4345157, and other related bugs).
543 // In reality, though, unblocking these signals is really a nop, since
544 // these signals are not blocked by default.
545 sigemptyset(&unblocked_sigs);
546 sigaddset(&unblocked_sigs, SIGILL);
547 sigaddset(&unblocked_sigs, SIGSEGV);
548 sigaddset(&unblocked_sigs, SIGBUS);
549 sigaddset(&unblocked_sigs, SIGFPE);
550 sigaddset(&unblocked_sigs, SR_signum);
551
552 if (!ReduceSignalUsage) {
553 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
554 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
555
556 }
557 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
558 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
559 }
560 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
561 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
562 }
563 }
564 // Fill in signals that are blocked by all but the VM thread.
565 sigemptyset(&vm_sigs);
566 if (!ReduceSignalUsage) {
567 sigaddset(&vm_sigs, BREAK_SIGNAL);
568 }
569 debug_only(signal_sets_initialized = true);
570
571 }
572
573 // These are signals that are unblocked while a thread is running Java.
574 // (For some reason, they get blocked by default.)
575 sigset_t* os::Bsd::unblocked_signals() {
576 assert(signal_sets_initialized, "Not initialized");
577 return &unblocked_sigs;
578 }
579
580 // These are the signals that are blocked while a (non-VM) thread is
581 // running Java. Only the VM thread handles these signals.
582 sigset_t* os::Bsd::vm_signals() {
583 assert(signal_sets_initialized, "Not initialized");
584 return &vm_sigs;
585 }
586
587 void os::Bsd::hotspot_sigmask(Thread* thread) {
588
589 //Save caller's signal mask before setting VM signal mask
590 sigset_t caller_sigmask;
591 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
592
593 OSThread* osthread = thread->osthread();
594 osthread->set_caller_sigmask(caller_sigmask);
595
596 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
597
598 if (!ReduceSignalUsage) {
599 if (thread->is_VM_thread()) {
600 // Only the VM thread handles BREAK_SIGNAL ...
601 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
602 } else {
603 // ... all other threads block BREAK_SIGNAL
604 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
605 }
606 }
607 }
608
609
610 //////////////////////////////////////////////////////////////////////////////
611 // create new thread
612
613 #ifdef __APPLE__
614 // library handle for calling objc_registerThreadWithCollector()
615 // without static linking to the libobjc library
616 #define OBJC_LIB "/usr/lib/libobjc.dylib"
617 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
618 typedef void (*objc_registerThreadWithCollector_t)();
619 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
620 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
621 #endif
622
623 #ifdef __APPLE__
624 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
625 // Additional thread_id used to correlate threads in SA
626 thread_identifier_info_data_t m_ident_info;
627 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
628
629 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
630 (thread_info_t) &m_ident_info, &count);
631
632 return m_ident_info.thread_id;
633 }
634 #endif
635
636 // Thread start routine for all newly created threads
637 static void *thread_native_entry(Thread *thread) {
638
639 thread->record_stack_base_and_size();
640
641 // Try to randomize the cache line index of hot stack frames.
642 // This helps when threads of the same stack traces evict each other's
643 // cache lines. The threads can be either from the same JVM instance, or
644 // from different JVM instances. The benefit is especially true for
645 // processors with hyperthreading technology.
646 static int counter = 0;
647 int pid = os::current_process_id();
648 alloca(((pid ^ counter++) & 7) * 128);
649
650 thread->initialize_thread_current();
651
652 OSThread* osthread = thread->osthread();
653 Monitor* sync = osthread->startThread_lock();
654
655 osthread->set_thread_id(os::Bsd::gettid());
656
657 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
658 os::current_thread_id(), (uintx) pthread_self());
659
660 #ifdef __APPLE__
661 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
662 guarantee(unique_thread_id != 0, "unique thread id was not found");
663 osthread->set_unique_thread_id(unique_thread_id);
664 #endif
665 // initialize signal mask for this thread
666 os::Bsd::hotspot_sigmask(thread);
667
668 // initialize floating point control register
669 os::Bsd::init_thread_fpu_state();
670
671 #ifdef __APPLE__
672 // register thread with objc gc
673 if (objc_registerThreadWithCollectorFunction != NULL) {
674 objc_registerThreadWithCollectorFunction();
675 }
676 #endif
677
678 // handshaking with parent thread
679 {
680 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
681
682 // notify parent thread
683 osthread->set_state(INITIALIZED);
684 sync->notify_all();
685
686 // wait until os::start_thread()
687 while (osthread->get_state() == INITIALIZED) {
688 sync->wait(Mutex::_no_safepoint_check_flag);
689 }
690 }
691
692 // call one more level start routine
693 thread->call_run();
694
695 // Note: at this point the thread object may already have deleted itself.
696 // Prevent dereferencing it from here on out.
697 thread = NULL;
698
699 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
700 os::current_thread_id(), (uintx) pthread_self());
701
702 return 0;
703 }
704
705 bool os::create_thread(Thread* thread, ThreadType thr_type,
706 size_t req_stack_size) {
707 assert(thread->osthread() == NULL, "caller responsible");
708
709 // Allocate the OSThread object
710 OSThread* osthread = new OSThread(NULL, NULL);
711 if (osthread == NULL) {
712 return false;
713 }
714
715 // set the correct thread state
716 osthread->set_thread_type(thr_type);
717
718 // Initial state is ALLOCATED but not INITIALIZED
719 osthread->set_state(ALLOCATED);
720
721 thread->set_osthread(osthread);
722
723 // init thread attributes
724 pthread_attr_t attr;
725 pthread_attr_init(&attr);
726 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
727
728 // calculate stack size if it's not specified by caller
729 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
730 int status = pthread_attr_setstacksize(&attr, stack_size);
731 assert_status(status == 0, status, "pthread_attr_setstacksize");
732
733 ThreadState state;
734
735 {
736 pthread_t tid;
737 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
738
739 char buf[64];
740 if (ret == 0) {
741 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
742 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
743 } else {
744 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
745 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
746 }
747
748 pthread_attr_destroy(&attr);
749
750 if (ret != 0) {
751 // Need to clean up stuff we've allocated so far
752 thread->set_osthread(NULL);
753 delete osthread;
754 return false;
755 }
756
757 // Store pthread info into the OSThread
758 osthread->set_pthread_id(tid);
759
760 // Wait until child thread is either initialized or aborted
761 {
762 Monitor* sync_with_child = osthread->startThread_lock();
763 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
764 while ((state = osthread->get_state()) == ALLOCATED) {
765 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
766 }
767 }
768
769 }
770
771 // Aborted due to thread limit being reached
772 if (state == ZOMBIE) {
773 thread->set_osthread(NULL);
774 delete osthread;
775 return false;
776 }
777
778 // The thread is returned suspended (in state INITIALIZED),
779 // and is started higher up in the call chain
780 assert(state == INITIALIZED, "race condition");
781 return true;
782 }
783
784 /////////////////////////////////////////////////////////////////////////////
785 // attach existing thread
786
787 // bootstrap the main thread
788 bool os::create_main_thread(JavaThread* thread) {
789 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
790 return create_attached_thread(thread);
791 }
792
793 bool os::create_attached_thread(JavaThread* thread) {
794 #ifdef ASSERT
795 thread->verify_not_published();
796 #endif
797
798 // Allocate the OSThread object
799 OSThread* osthread = new OSThread(NULL, NULL);
800
801 if (osthread == NULL) {
802 return false;
803 }
804
805 osthread->set_thread_id(os::Bsd::gettid());
806
807 // Store pthread info into the OSThread
808 #ifdef __APPLE__
809 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
810 guarantee(unique_thread_id != 0, "just checking");
811 osthread->set_unique_thread_id(unique_thread_id);
812 #endif
813 osthread->set_pthread_id(::pthread_self());
814
815 // initialize floating point control register
816 os::Bsd::init_thread_fpu_state();
817
818 // Initial thread state is RUNNABLE
819 osthread->set_state(RUNNABLE);
820
821 thread->set_osthread(osthread);
822
823 // initialize signal mask for this thread
824 // and save the caller's signal mask
825 os::Bsd::hotspot_sigmask(thread);
826
827 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
828 os::current_thread_id(), (uintx) pthread_self());
829
830 return true;
831 }
832
833 void os::pd_start_thread(Thread* thread) {
834 OSThread * osthread = thread->osthread();
835 assert(osthread->get_state() != INITIALIZED, "just checking");
836 Monitor* sync_with_child = osthread->startThread_lock();
837 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
838 sync_with_child->notify();
839 }
840
841 // Free Bsd resources related to the OSThread
842 void os::free_thread(OSThread* osthread) {
843 assert(osthread != NULL, "osthread not set");
844
845 // We are told to free resources of the argument thread,
846 // but we can only really operate on the current thread.
847 assert(Thread::current()->osthread() == osthread,
848 "os::free_thread but not current thread");
849
850 // Restore caller's signal mask
851 sigset_t sigmask = osthread->caller_sigmask();
852 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
853
854 delete osthread;
855 }
856
857 ////////////////////////////////////////////////////////////////////////////////
858 // time support
859
860 // Time since start-up in seconds to a fine granularity.
861 // Used by VMSelfDestructTimer and the MemProfiler.
862 double os::elapsedTime() {
863
864 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
865 }
866
867 jlong os::elapsed_counter() {
868 return javaTimeNanos() - initial_time_count;
869 }
870
871 jlong os::elapsed_frequency() {
872 return NANOSECS_PER_SEC; // nanosecond resolution
873 }
874
875 bool os::supports_vtime() { return true; }
876 bool os::enable_vtime() { return false; }
877 bool os::vtime_enabled() { return false; }
878
879 double os::elapsedVTime() {
880 // better than nothing, but not much
881 return elapsedTime();
882 }
883
884 jlong os::javaTimeMillis() {
885 timeval time;
886 int status = gettimeofday(&time, NULL);
887 assert(status != -1, "bsd error");
888 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
889 }
890
891 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
892 timeval time;
893 int status = gettimeofday(&time, NULL);
894 assert(status != -1, "bsd error");
895 seconds = jlong(time.tv_sec);
896 nanos = jlong(time.tv_usec) * 1000;
897 }
898
899 #ifndef __APPLE__
900 #ifndef CLOCK_MONOTONIC
901 #define CLOCK_MONOTONIC (1)
902 #endif
903 #endif
904
905 #ifdef __APPLE__
906 void os::Bsd::clock_init() {
907 mach_timebase_info(&_timebase_info);
908 }
909 #else
910 void os::Bsd::clock_init() {
911 struct timespec res;
912 struct timespec tp;
913 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
914 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
915 // yes, monotonic clock is supported
916 _clock_gettime = ::clock_gettime;
917 }
918 }
919 #endif
920
921
922
923 #ifdef __APPLE__
924
925 jlong os::javaTimeNanos() {
926 const uint64_t tm = mach_absolute_time();
927 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
928 const uint64_t prev = Bsd::_max_abstime;
929 if (now <= prev) {
930 return prev; // same or retrograde time;
931 }
932 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
933 assert(obsv >= prev, "invariant"); // Monotonicity
934 // If the CAS succeeded then we're done and return "now".
935 // If the CAS failed and the observed value "obsv" is >= now then
936 // we should return "obsv". If the CAS failed and now > obsv > prv then
937 // some other thread raced this thread and installed a new value, in which case
938 // we could either (a) retry the entire operation, (b) retry trying to install now
939 // or (c) just return obsv. We use (c). No loop is required although in some cases
940 // we might discard a higher "now" value in deference to a slightly lower but freshly
941 // installed obsv value. That's entirely benign -- it admits no new orderings compared
942 // to (a) or (b) -- and greatly reduces coherence traffic.
943 // We might also condition (c) on the magnitude of the delta between obsv and now.
944 // Avoiding excessive CAS operations to hot RW locations is critical.
945 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
946 return (prev == obsv) ? now : obsv;
947 }
948
949 #else // __APPLE__
950
951 jlong os::javaTimeNanos() {
952 if (os::supports_monotonic_clock()) {
953 struct timespec tp;
954 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
955 assert(status == 0, "gettime error");
956 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
957 return result;
958 } else {
959 timeval time;
960 int status = gettimeofday(&time, NULL);
961 assert(status != -1, "bsd error");
962 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
963 return 1000 * usecs;
964 }
965 }
966
967 #endif // __APPLE__
968
969 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
970 if (os::supports_monotonic_clock()) {
971 info_ptr->max_value = ALL_64_BITS;
972
973 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
974 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
975 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
976 } else {
977 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
978 info_ptr->max_value = ALL_64_BITS;
979
980 // gettimeofday is a real time clock so it skips
981 info_ptr->may_skip_backward = true;
982 info_ptr->may_skip_forward = true;
983 }
984
985 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
986 }
987
988 // Return the real, user, and system times in seconds from an
989 // arbitrary fixed point in the past.
990 bool os::getTimesSecs(double* process_real_time,
991 double* process_user_time,
992 double* process_system_time) {
993 struct tms ticks;
994 clock_t real_ticks = times(&ticks);
995
996 if (real_ticks == (clock_t) (-1)) {
997 return false;
998 } else {
999 double ticks_per_second = (double) clock_tics_per_sec;
1000 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1001 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1002 *process_real_time = ((double) real_ticks) / ticks_per_second;
1003
1004 return true;
1005 }
1006 }
1007
1008
1009 char * os::local_time_string(char *buf, size_t buflen) {
1010 struct tm t;
1011 time_t long_time;
1012 time(&long_time);
1013 localtime_r(&long_time, &t);
1014 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1015 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1016 t.tm_hour, t.tm_min, t.tm_sec);
1017 return buf;
1018 }
1019
1020 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1021 return localtime_r(clock, res);
1022 }
1023
1024 ////////////////////////////////////////////////////////////////////////////////
1025 // runtime exit support
1026
1027 // Note: os::shutdown() might be called very early during initialization, or
1028 // called from signal handler. Before adding something to os::shutdown(), make
1029 // sure it is async-safe and can handle partially initialized VM.
1030 void os::shutdown() {
1031
1032 // allow PerfMemory to attempt cleanup of any persistent resources
1033 perfMemory_exit();
1034
1035 // needs to remove object in file system
1036 AttachListener::abort();
1037
1038 // flush buffered output, finish log files
1039 ostream_abort();
1040
1041 // Check for abort hook
1042 abort_hook_t abort_hook = Arguments::abort_hook();
1043 if (abort_hook != NULL) {
1044 abort_hook();
1045 }
1046
1047 }
1048
1049 // Note: os::abort() might be called very early during initialization, or
1050 // called from signal handler. Before adding something to os::abort(), make
1051 // sure it is async-safe and can handle partially initialized VM.
1052 void os::abort(bool dump_core, void* siginfo, const void* context) {
1053 os::shutdown();
1054 if (dump_core) {
1055 #ifndef PRODUCT
1056 fdStream out(defaultStream::output_fd());
1057 out.print_raw("Current thread is ");
1058 char buf[16];
1059 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1060 out.print_raw_cr(buf);
1061 out.print_raw_cr("Dumping core ...");
1062 #endif
1063 ::abort(); // dump core
1064 }
1065
1066 ::exit(1);
1067 }
1068
1069 // Die immediately, no exit hook, no abort hook, no cleanup.
1070 void os::die() {
1071 // _exit() on BsdThreads only kills current thread
1072 ::abort();
1073 }
1074
1075 // Information of current thread in variety of formats
1076 pid_t os::Bsd::gettid() {
1077 int retval = -1;
1078
1079 #ifdef __APPLE__ //XNU kernel
1080 // despite the fact mach port is actually not a thread id use it
1081 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1082 retval = ::pthread_mach_thread_np(::pthread_self());
1083 guarantee(retval != 0, "just checking");
1084 return retval;
1085
1086 #else
1087 #ifdef __FreeBSD__
1088 retval = syscall(SYS_thr_self);
1089 #else
1090 #ifdef __OpenBSD__
1091 retval = syscall(SYS_getthrid);
1092 #else
1093 #ifdef __NetBSD__
1094 retval = (pid_t) syscall(SYS__lwp_self);
1095 #endif
1096 #endif
1097 #endif
1098 #endif
1099
1100 if (retval == -1) {
1101 return getpid();
1102 }
1103 }
1104
1105 intx os::current_thread_id() {
1106 #ifdef __APPLE__
1107 return (intx)::pthread_mach_thread_np(::pthread_self());
1108 #else
1109 return (intx)::pthread_self();
1110 #endif
1111 }
1112
1113 int os::current_process_id() {
1114
1115 // Under the old bsd thread library, bsd gives each thread
1116 // its own process id. Because of this each thread will return
1117 // a different pid if this method were to return the result
1118 // of getpid(2). Bsd provides no api that returns the pid
1119 // of the launcher thread for the vm. This implementation
1120 // returns a unique pid, the pid of the launcher thread
1121 // that starts the vm 'process'.
1122
1123 // Under the NPTL, getpid() returns the same pid as the
1124 // launcher thread rather than a unique pid per thread.
1125 // Use gettid() if you want the old pre NPTL behaviour.
1126
1127 // if you are looking for the result of a call to getpid() that
1128 // returns a unique pid for the calling thread, then look at the
1129 // OSThread::thread_id() method in osThread_bsd.hpp file
1130
1131 return (int)(_initial_pid ? _initial_pid : getpid());
1132 }
1133
1134 // DLL functions
1135
1136 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1137
1138 // This must be hard coded because it's the system's temporary
1139 // directory not the java application's temp directory, ala java.io.tmpdir.
1140 #ifdef __APPLE__
1141 // macosx has a secure per-user temporary directory
1142 char temp_path_storage[PATH_MAX];
1143 const char* os::get_temp_directory() {
1144 static char *temp_path = NULL;
1145 if (temp_path == NULL) {
1146 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1147 if (pathSize == 0 || pathSize > PATH_MAX) {
1148 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1149 }
1150 temp_path = temp_path_storage;
1151 }
1152 return temp_path;
1153 }
1154 #else // __APPLE__
1155 const char* os::get_temp_directory() { return "/tmp"; }
1156 #endif // __APPLE__
1157
1158 // check if addr is inside libjvm.so
1159 bool os::address_is_in_vm(address addr) {
1160 static address libjvm_base_addr;
1161 Dl_info dlinfo;
1162
1163 if (libjvm_base_addr == NULL) {
1164 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1165 libjvm_base_addr = (address)dlinfo.dli_fbase;
1166 }
1167 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1168 }
1169
1170 if (dladdr((void *)addr, &dlinfo) != 0) {
1171 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1172 }
1173
1174 return false;
1175 }
1176
1177
1178 #define MACH_MAXSYMLEN 256
1179
1180 bool os::dll_address_to_function_name(address addr, char *buf,
1181 int buflen, int *offset,
1182 bool demangle) {
1183 // buf is not optional, but offset is optional
1184 assert(buf != NULL, "sanity check");
1185
1186 Dl_info dlinfo;
1187 char localbuf[MACH_MAXSYMLEN];
1188
1189 if (dladdr((void*)addr, &dlinfo) != 0) {
1190 // see if we have a matching symbol
1191 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1192 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1193 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1194 }
1195 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1196 return true;
1197 }
1198 // no matching symbol so try for just file info
1199 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1200 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1201 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1202 return true;
1203 }
1204 }
1205
1206 // Handle non-dynamic manually:
1207 if (dlinfo.dli_fbase != NULL &&
1208 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1209 dlinfo.dli_fbase)) {
1210 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1211 jio_snprintf(buf, buflen, "%s", localbuf);
1212 }
1213 return true;
1214 }
1215 }
1216 buf[0] = '\0';
1217 if (offset != NULL) *offset = -1;
1218 return false;
1219 }
1220
1221 // ported from solaris version
1222 bool os::dll_address_to_library_name(address addr, char* buf,
1223 int buflen, int* offset) {
1224 // buf is not optional, but offset is optional
1225 assert(buf != NULL, "sanity check");
1226
1227 Dl_info dlinfo;
1228
1229 if (dladdr((void*)addr, &dlinfo) != 0) {
1230 if (dlinfo.dli_fname != NULL) {
1231 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1232 }
1233 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1234 *offset = addr - (address)dlinfo.dli_fbase;
1235 }
1236 return true;
1237 }
1238
1239 buf[0] = '\0';
1240 if (offset) *offset = -1;
1241 return false;
1242 }
1243
1244 // Loads .dll/.so and
1245 // in case of error it checks if .dll/.so was built for the
1246 // same architecture as Hotspot is running on
1247
1248 #ifdef __APPLE__
1249 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1250 #ifdef STATIC_BUILD
1251 return os::get_default_process_handle();
1252 #else
1253 void * result= ::dlopen(filename, RTLD_LAZY);
1254 if (result != NULL) {
1255 // Successful loading
1256 return result;
1257 }
1258
1259 // Read system error message into ebuf
1260 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1261 ebuf[ebuflen-1]='\0';
1262
1263 return NULL;
1264 #endif // STATIC_BUILD
1265 }
1266 #else
1267 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1268 #ifdef STATIC_BUILD
1269 return os::get_default_process_handle();
1270 #else
1271 void * result= ::dlopen(filename, RTLD_LAZY);
1272 if (result != NULL) {
1273 // Successful loading
1274 return result;
1275 }
1276
1277 Elf32_Ehdr elf_head;
1278
1279 // Read system error message into ebuf
1280 // It may or may not be overwritten below
1281 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1282 ebuf[ebuflen-1]='\0';
1283 int diag_msg_max_length=ebuflen-strlen(ebuf);
1284 char* diag_msg_buf=ebuf+strlen(ebuf);
1285
1286 if (diag_msg_max_length==0) {
1287 // No more space in ebuf for additional diagnostics message
1288 return NULL;
1289 }
1290
1291
1292 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1293
1294 if (file_descriptor < 0) {
1295 // Can't open library, report dlerror() message
1296 return NULL;
1297 }
1298
1299 bool failed_to_read_elf_head=
1300 (sizeof(elf_head)!=
1301 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1302
1303 ::close(file_descriptor);
1304 if (failed_to_read_elf_head) {
1305 // file i/o error - report dlerror() msg
1306 return NULL;
1307 }
1308
1309 typedef struct {
1310 Elf32_Half code; // Actual value as defined in elf.h
1311 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1312 char elf_class; // 32 or 64 bit
1313 char endianess; // MSB or LSB
1314 char* name; // String representation
1315 } arch_t;
1316
1317 #ifndef EM_486
1318 #define EM_486 6 /* Intel 80486 */
1319 #endif
1320
1321 #ifndef EM_MIPS_RS3_LE
1322 #define EM_MIPS_RS3_LE 10 /* MIPS */
1323 #endif
1324
1325 #ifndef EM_PPC64
1326 #define EM_PPC64 21 /* PowerPC64 */
1327 #endif
1328
1329 #ifndef EM_S390
1330 #define EM_S390 22 /* IBM System/390 */
1331 #endif
1332
1333 #ifndef EM_IA_64
1334 #define EM_IA_64 50 /* HP/Intel IA-64 */
1335 #endif
1336
1337 #ifndef EM_X86_64
1338 #define EM_X86_64 62 /* AMD x86-64 */
1339 #endif
1340
1341 static const arch_t arch_array[]={
1342 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1343 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1344 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1345 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1346 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1347 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1348 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1349 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1350 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1351 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1352 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1353 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1354 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1355 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1356 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1357 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1358 };
1359
1360 #if (defined IA32)
1361 static Elf32_Half running_arch_code=EM_386;
1362 #elif (defined AMD64)
1363 static Elf32_Half running_arch_code=EM_X86_64;
1364 #elif (defined IA64)
1365 static Elf32_Half running_arch_code=EM_IA_64;
1366 #elif (defined __sparc) && (defined _LP64)
1367 static Elf32_Half running_arch_code=EM_SPARCV9;
1368 #elif (defined __sparc) && (!defined _LP64)
1369 static Elf32_Half running_arch_code=EM_SPARC;
1370 #elif (defined __powerpc64__)
1371 static Elf32_Half running_arch_code=EM_PPC64;
1372 #elif (defined __powerpc__)
1373 static Elf32_Half running_arch_code=EM_PPC;
1374 #elif (defined ARM)
1375 static Elf32_Half running_arch_code=EM_ARM;
1376 #elif (defined S390)
1377 static Elf32_Half running_arch_code=EM_S390;
1378 #elif (defined ALPHA)
1379 static Elf32_Half running_arch_code=EM_ALPHA;
1380 #elif (defined MIPSEL)
1381 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1382 #elif (defined PARISC)
1383 static Elf32_Half running_arch_code=EM_PARISC;
1384 #elif (defined MIPS)
1385 static Elf32_Half running_arch_code=EM_MIPS;
1386 #elif (defined M68K)
1387 static Elf32_Half running_arch_code=EM_68K;
1388 #else
1389 #error Method os::dll_load requires that one of following is defined:\
1390 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1391 #endif
1392
1393 // Identify compatability class for VM's architecture and library's architecture
1394 // Obtain string descriptions for architectures
1395
1396 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1397 int running_arch_index=-1;
1398
1399 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1400 if (running_arch_code == arch_array[i].code) {
1401 running_arch_index = i;
1402 }
1403 if (lib_arch.code == arch_array[i].code) {
1404 lib_arch.compat_class = arch_array[i].compat_class;
1405 lib_arch.name = arch_array[i].name;
1406 }
1407 }
1408
1409 assert(running_arch_index != -1,
1410 "Didn't find running architecture code (running_arch_code) in arch_array");
1411 if (running_arch_index == -1) {
1412 // Even though running architecture detection failed
1413 // we may still continue with reporting dlerror() message
1414 return NULL;
1415 }
1416
1417 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1418 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1419 return NULL;
1420 }
1421
1422 #ifndef S390
1423 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1424 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1425 return NULL;
1426 }
1427 #endif // !S390
1428
1429 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1430 if (lib_arch.name!=NULL) {
1431 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1432 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1433 lib_arch.name, arch_array[running_arch_index].name);
1434 } else {
1435 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1436 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1437 lib_arch.code,
1438 arch_array[running_arch_index].name);
1439 }
1440 }
1441
1442 return NULL;
1443 #endif // STATIC_BUILD
1444 }
1445 #endif // !__APPLE__
1446
1447 void* os::get_default_process_handle() {
1448 #ifdef __APPLE__
1449 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1450 // to avoid finding unexpected symbols on second (or later)
1451 // loads of a library.
1452 return (void*)::dlopen(NULL, RTLD_FIRST);
1453 #else
1454 return (void*)::dlopen(NULL, RTLD_LAZY);
1455 #endif
1456 }
1457
1458 // XXX: Do we need a lock around this as per Linux?
1459 void* os::dll_lookup(void* handle, const char* name) {
1460 return dlsym(handle, name);
1461 }
1462
1463 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1464 outputStream * out = (outputStream *) param;
1465 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1466 return 0;
1467 }
1468
1469 void os::print_dll_info(outputStream *st) {
1470 st->print_cr("Dynamic libraries:");
1471 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1472 st->print_cr("Error: Cannot print dynamic libraries.");
1473 }
1474 }
1475
1476 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1477 #ifdef RTLD_DI_LINKMAP
1478 Dl_info dli;
1479 void *handle;
1480 Link_map *map;
1481 Link_map *p;
1482
1483 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1484 dli.dli_fname == NULL) {
1485 return 1;
1486 }
1487 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1488 if (handle == NULL) {
1489 return 1;
1490 }
1491 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1492 if (map == NULL) {
1493 dlclose(handle);
1494 return 1;
1495 }
1496
1497 while (map->l_prev != NULL)
1498 map = map->l_prev;
1499
1500 while (map != NULL) {
1501 // Value for top_address is returned as 0 since we don't have any information about module size
1502 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1503 dlclose(handle);
1504 return 1;
1505 }
1506 map = map->l_next;
1507 }
1508
1509 dlclose(handle);
1510 #elif defined(__APPLE__)
1511 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1512 // Value for top_address is returned as 0 since we don't have any information about module size
1513 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1514 return 1;
1515 }
1516 }
1517 return 0;
1518 #else
1519 return 1;
1520 #endif
1521 }
1522
1523 void os::get_summary_os_info(char* buf, size_t buflen) {
1524 // These buffers are small because we want this to be brief
1525 // and not use a lot of stack while generating the hs_err file.
1526 char os[100];
1527 size_t size = sizeof(os);
1528 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1529 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1530 #ifdef __APPLE__
1531 strncpy(os, "Darwin", sizeof(os));
1532 #elif __OpenBSD__
1533 strncpy(os, "OpenBSD", sizeof(os));
1534 #else
1535 strncpy(os, "BSD", sizeof(os));
1536 #endif
1537 }
1538
1539 char release[100];
1540 size = sizeof(release);
1541 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1542 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1543 // if error, leave blank
1544 strncpy(release, "", sizeof(release));
1545 }
1546 snprintf(buf, buflen, "%s %s", os, release);
1547 }
1548
1549 void os::print_os_info_brief(outputStream* st) {
1550 os::Posix::print_uname_info(st);
1551 }
1552
1553 void os::print_os_info(outputStream* st) {
1554 st->print("OS:");
1555
1556 os::Posix::print_uname_info(st);
1557
1558 os::Posix::print_rlimit_info(st);
1559
1560 os::Posix::print_load_average(st);
1561 }
1562
1563 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1564 // Nothing to do for now.
1565 }
1566
1567 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1568 unsigned int mhz;
1569 size_t size = sizeof(mhz);
1570 int mib[] = { CTL_HW, HW_CPU_FREQ };
1571 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1572 mhz = 1; // looks like an error but can be divided by
1573 } else {
1574 mhz /= 1000000; // reported in millions
1575 }
1576
1577 char model[100];
1578 size = sizeof(model);
1579 int mib_model[] = { CTL_HW, HW_MODEL };
1580 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1581 strncpy(model, cpu_arch, sizeof(model));
1582 }
1583
1584 char machine[100];
1585 size = sizeof(machine);
1586 int mib_machine[] = { CTL_HW, HW_MACHINE };
1587 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1588 strncpy(machine, "", sizeof(machine));
1589 }
1590
1591 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1592 }
1593
1594 void os::print_memory_info(outputStream* st) {
1595
1596 st->print("Memory:");
1597 st->print(" %dk page", os::vm_page_size()>>10);
1598
1599 st->print(", physical " UINT64_FORMAT "k",
1600 os::physical_memory() >> 10);
1601 st->print("(" UINT64_FORMAT "k free)",
1602 os::available_memory() >> 10);
1603 st->cr();
1604 }
1605
1606 static void print_signal_handler(outputStream* st, int sig,
1607 char* buf, size_t buflen);
1608
1609 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1610 st->print_cr("Signal Handlers:");
1611 print_signal_handler(st, SIGSEGV, buf, buflen);
1612 print_signal_handler(st, SIGBUS , buf, buflen);
1613 print_signal_handler(st, SIGFPE , buf, buflen);
1614 print_signal_handler(st, SIGPIPE, buf, buflen);
1615 print_signal_handler(st, SIGXFSZ, buf, buflen);
1616 print_signal_handler(st, SIGILL , buf, buflen);
1617 print_signal_handler(st, SR_signum, buf, buflen);
1618 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1619 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1620 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1621 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1622 }
1623
1624 static char saved_jvm_path[MAXPATHLEN] = {0};
1625
1626 // Find the full path to the current module, libjvm
1627 void os::jvm_path(char *buf, jint buflen) {
1628 // Error checking.
1629 if (buflen < MAXPATHLEN) {
1630 assert(false, "must use a large-enough buffer");
1631 buf[0] = '\0';
1632 return;
1633 }
1634 // Lazy resolve the path to current module.
1635 if (saved_jvm_path[0] != 0) {
1636 strcpy(buf, saved_jvm_path);
1637 return;
1638 }
1639
1640 char dli_fname[MAXPATHLEN];
1641 bool ret = dll_address_to_library_name(
1642 CAST_FROM_FN_PTR(address, os::jvm_path),
1643 dli_fname, sizeof(dli_fname), NULL);
1644 assert(ret, "cannot locate libjvm");
1645 char *rp = NULL;
1646 if (ret && dli_fname[0] != '\0') {
1647 rp = os::Posix::realpath(dli_fname, buf, buflen);
1648 }
1649 if (rp == NULL) {
1650 return;
1651 }
1652
1653 if (Arguments::sun_java_launcher_is_altjvm()) {
1654 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1655 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1656 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1657 // appears at the right place in the string, then assume we are
1658 // installed in a JDK and we're done. Otherwise, check for a
1659 // JAVA_HOME environment variable and construct a path to the JVM
1660 // being overridden.
1661
1662 const char *p = buf + strlen(buf) - 1;
1663 for (int count = 0; p > buf && count < 5; ++count) {
1664 for (--p; p > buf && *p != '/'; --p)
1665 /* empty */ ;
1666 }
1667
1668 if (strncmp(p, "/jre/lib/", 9) != 0) {
1669 // Look for JAVA_HOME in the environment.
1670 char* java_home_var = ::getenv("JAVA_HOME");
1671 if (java_home_var != NULL && java_home_var[0] != 0) {
1672 char* jrelib_p;
1673 int len;
1674
1675 // Check the current module name "libjvm"
1676 p = strrchr(buf, '/');
1677 assert(strstr(p, "/libjvm") == p, "invalid library name");
1678
1679 rp = os::Posix::realpath(java_home_var, buf, buflen);
1680 if (rp == NULL) {
1681 return;
1682 }
1683
1684 // determine if this is a legacy image or modules image
1685 // modules image doesn't have "jre" subdirectory
1686 len = strlen(buf);
1687 assert(len < buflen, "Ran out of buffer space");
1688 jrelib_p = buf + len;
1689
1690 // Add the appropriate library subdir
1691 snprintf(jrelib_p, buflen-len, "/jre/lib");
1692 if (0 != access(buf, F_OK)) {
1693 snprintf(jrelib_p, buflen-len, "/lib");
1694 }
1695
1696 // Add the appropriate client or server subdir
1697 len = strlen(buf);
1698 jrelib_p = buf + len;
1699 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1700 if (0 != access(buf, F_OK)) {
1701 snprintf(jrelib_p, buflen-len, "%s", "");
1702 }
1703
1704 // If the path exists within JAVA_HOME, add the JVM library name
1705 // to complete the path to JVM being overridden. Otherwise fallback
1706 // to the path to the current library.
1707 if (0 == access(buf, F_OK)) {
1708 // Use current module name "libjvm"
1709 len = strlen(buf);
1710 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1711 } else {
1712 // Fall back to path of current library
1713 rp = os::Posix::realpath(dli_fname, buf, buflen);
1714 if (rp == NULL) {
1715 return;
1716 }
1717 }
1718 }
1719 }
1720 }
1721
1722 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1723 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1724 }
1725
1726 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1727 // no prefix required, not even "_"
1728 }
1729
1730 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1731 // no suffix required
1732 }
1733
1734 ////////////////////////////////////////////////////////////////////////////////
1735 // sun.misc.Signal support
1736
1737 static volatile jint sigint_count = 0;
1738
1739 static void UserHandler(int sig, void *siginfo, void *context) {
1740 // 4511530 - sem_post is serialized and handled by the manager thread. When
1741 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1742 // don't want to flood the manager thread with sem_post requests.
1743 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1744 return;
1745 }
1746
1747 // Ctrl-C is pressed during error reporting, likely because the error
1748 // handler fails to abort. Let VM die immediately.
1749 if (sig == SIGINT && VMError::is_error_reported()) {
1750 os::die();
1751 }
1752
1753 os::signal_notify(sig);
1754 }
1755
1756 void* os::user_handler() {
1757 return CAST_FROM_FN_PTR(void*, UserHandler);
1758 }
1759
1760 extern "C" {
1761 typedef void (*sa_handler_t)(int);
1762 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1763 }
1764
1765 void* os::signal(int signal_number, void* handler) {
1766 struct sigaction sigAct, oldSigAct;
1767
1768 sigfillset(&(sigAct.sa_mask));
1769 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1770 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1771
1772 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1773 // -1 means registration failed
1774 return (void *)-1;
1775 }
1776
1777 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1778 }
1779
1780 void os::signal_raise(int signal_number) {
1781 ::raise(signal_number);
1782 }
1783
1784 // The following code is moved from os.cpp for making this
1785 // code platform specific, which it is by its very nature.
1786
1787 // Will be modified when max signal is changed to be dynamic
1788 int os::sigexitnum_pd() {
1789 return NSIG;
1790 }
1791
1792 // a counter for each possible signal value
1793 static volatile jint pending_signals[NSIG+1] = { 0 };
1794 static Semaphore* sig_sem = NULL;
1795
1796 static void jdk_misc_signal_init() {
1797 // Initialize signal structures
1798 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1799
1800 // Initialize signal semaphore
1801 sig_sem = new Semaphore();
1802 }
1803
1804 void os::signal_notify(int sig) {
1805 if (sig_sem != NULL) {
1806 Atomic::inc(&pending_signals[sig]);
1807 sig_sem->signal();
1808 } else {
1809 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1810 // initialization isn't called.
1811 assert(ReduceSignalUsage, "signal semaphore should be created");
1812 }
1813 }
1814
1815 static int check_pending_signals() {
1816 Atomic::store(0, &sigint_count);
1817 for (;;) {
1818 for (int i = 0; i < NSIG + 1; i++) {
1819 jint n = pending_signals[i];
1820 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1821 return i;
1822 }
1823 }
1824 JavaThread *thread = JavaThread::current();
1825 ThreadBlockInVM tbivm(thread);
1826
1827 bool threadIsSuspended;
1828 do {
1829 thread->set_suspend_equivalent();
1830 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1831 sig_sem->wait();
1832
1833 // were we externally suspended while we were waiting?
1834 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1835 if (threadIsSuspended) {
1836 // The semaphore has been incremented, but while we were waiting
1837 // another thread suspended us. We don't want to continue running
1838 // while suspended because that would surprise the thread that
1839 // suspended us.
1840 sig_sem->signal();
1841
1842 thread->java_suspend_self();
1843 }
1844 } while (threadIsSuspended);
1845 }
1846 }
1847
1848 int os::signal_wait() {
1849 return check_pending_signals();
1850 }
1851
1852 ////////////////////////////////////////////////////////////////////////////////
1853 // Virtual Memory
1854
1855 int os::vm_page_size() {
1856 // Seems redundant as all get out
1857 assert(os::Bsd::page_size() != -1, "must call os::init");
1858 return os::Bsd::page_size();
1859 }
1860
1861 // Solaris allocates memory by pages.
1862 int os::vm_allocation_granularity() {
1863 assert(os::Bsd::page_size() != -1, "must call os::init");
1864 return os::Bsd::page_size();
1865 }
1866
1867 // Rationale behind this function:
1868 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1869 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1870 // samples for JITted code. Here we create private executable mapping over the code cache
1871 // and then we can use standard (well, almost, as mapping can change) way to provide
1872 // info for the reporting script by storing timestamp and location of symbol
1873 void bsd_wrap_code(char* base, size_t size) {
1874 static volatile jint cnt = 0;
1875
1876 if (!UseOprofile) {
1877 return;
1878 }
1879
1880 char buf[PATH_MAX + 1];
1881 int num = Atomic::add(1, &cnt);
1882
1883 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1884 os::get_temp_directory(), os::current_process_id(), num);
1885 unlink(buf);
1886
1887 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1888
1889 if (fd != -1) {
1890 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1891 if (rv != (off_t)-1) {
1892 if (::write(fd, "", 1) == 1) {
1893 mmap(base, size,
1894 PROT_READ|PROT_WRITE|PROT_EXEC,
1895 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1896 }
1897 }
1898 ::close(fd);
1899 unlink(buf);
1900 }
1901 }
1902
1903 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1904 int err) {
1905 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1906 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1907 os::errno_name(err), err);
1908 }
1909
1910 // NOTE: Bsd kernel does not really reserve the pages for us.
1911 // All it does is to check if there are enough free pages
1912 // left at the time of mmap(). This could be a potential
1913 // problem.
1914 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1915 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1916 #ifdef __OpenBSD__
1917 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1918 if (::mprotect(addr, size, prot) == 0) {
1919 return true;
1920 }
1921 #else
1922 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1923 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1924 if (res != (uintptr_t) MAP_FAILED) {
1925 return true;
1926 }
1927 #endif
1928
1929 // Warn about any commit errors we see in non-product builds just
1930 // in case mmap() doesn't work as described on the man page.
1931 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1932
1933 return false;
1934 }
1935
1936 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1937 bool exec) {
1938 // alignment_hint is ignored on this OS
1939 return pd_commit_memory(addr, size, exec);
1940 }
1941
1942 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1943 const char* mesg) {
1944 assert(mesg != NULL, "mesg must be specified");
1945 if (!pd_commit_memory(addr, size, exec)) {
1946 // add extra info in product mode for vm_exit_out_of_memory():
1947 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1948 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1949 }
1950 }
1951
1952 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1953 size_t alignment_hint, bool exec,
1954 const char* mesg) {
1955 // alignment_hint is ignored on this OS
1956 pd_commit_memory_or_exit(addr, size, exec, mesg);
1957 }
1958
1959 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1960 }
1961
1962 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
1963 ::madvise(addr, bytes, MADV_DONTNEED);
1964 }
1965
1966 void os::numa_make_global(char *addr, size_t bytes) {
1967 }
1968
1969 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
1970 }
1971
1972 bool os::numa_topology_changed() { return false; }
1973
1974 size_t os::numa_get_groups_num() {
1975 return 1;
1976 }
1977
1978 int os::numa_get_group_id() {
1979 return 0;
1980 }
1981
1982 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
1983 if (size > 0) {
1984 ids[0] = 0;
1985 return 1;
1986 }
1987 return 0;
1988 }
1989
1990 bool os::get_page_info(char *start, page_info* info) {
1991 return false;
1992 }
1993
1994 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
1995 return end;
1996 }
1997
1998
1999 bool os::pd_uncommit_memory(char* addr, size_t size) {
2000 #ifdef __OpenBSD__
2001 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2002 return ::mprotect(addr, size, PROT_NONE) == 0;
2003 #else
2004 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2005 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2006 return res != (uintptr_t) MAP_FAILED;
2007 #endif
2008 }
2009
2010 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2011 return os::commit_memory(addr, size, !ExecMem);
2012 }
2013
2014 // If this is a growable mapping, remove the guard pages entirely by
2015 // munmap()ping them. If not, just call uncommit_memory().
2016 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2017 return os::uncommit_memory(addr, size);
2018 }
2019
2020 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2021 // at 'requested_addr'. If there are existing memory mappings at the same
2022 // location, however, they will be overwritten. If 'fixed' is false,
2023 // 'requested_addr' is only treated as a hint, the return value may or
2024 // may not start from the requested address. Unlike Bsd mmap(), this
2025 // function returns NULL to indicate failure.
2026 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2027 char * addr;
2028 int flags;
2029
2030 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2031 if (fixed) {
2032 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2033 flags |= MAP_FIXED;
2034 }
2035
2036 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2037 // touch an uncommitted page. Otherwise, the read/write might
2038 // succeed if we have enough swap space to back the physical page.
2039 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2040 flags, -1, 0);
2041
2042 return addr == MAP_FAILED ? NULL : addr;
2043 }
2044
2045 static int anon_munmap(char * addr, size_t size) {
2046 return ::munmap(addr, size) == 0;
2047 }
2048
2049 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2050 size_t alignment_hint) {
2051 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2052 }
2053
2054 bool os::pd_release_memory(char* addr, size_t size) {
2055 return anon_munmap(addr, size);
2056 }
2057
2058 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2059 // Bsd wants the mprotect address argument to be page aligned.
2060 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2061
2062 // According to SUSv3, mprotect() should only be used with mappings
2063 // established by mmap(), and mmap() always maps whole pages. Unaligned
2064 // 'addr' likely indicates problem in the VM (e.g. trying to change
2065 // protection of malloc'ed or statically allocated memory). Check the
2066 // caller if you hit this assert.
2067 assert(addr == bottom, "sanity check");
2068
2069 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2070 return ::mprotect(bottom, size, prot) == 0;
2071 }
2072
2073 // Set protections specified
2074 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2075 bool is_committed) {
2076 unsigned int p = 0;
2077 switch (prot) {
2078 case MEM_PROT_NONE: p = PROT_NONE; break;
2079 case MEM_PROT_READ: p = PROT_READ; break;
2080 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2081 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2082 default:
2083 ShouldNotReachHere();
2084 }
2085 // is_committed is unused.
2086 return bsd_mprotect(addr, bytes, p);
2087 }
2088
2089 bool os::guard_memory(char* addr, size_t size) {
2090 return bsd_mprotect(addr, size, PROT_NONE);
2091 }
2092
2093 bool os::unguard_memory(char* addr, size_t size) {
2094 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2095 }
2096
2097 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2098 return false;
2099 }
2100
2101 // Large page support
2102
2103 static size_t _large_page_size = 0;
2104
2105 void os::large_page_init() {
2106 }
2107
2108
2109 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2110 fatal("os::reserve_memory_special should not be called on BSD.");
2111 return NULL;
2112 }
2113
2114 bool os::release_memory_special(char* base, size_t bytes) {
2115 fatal("os::release_memory_special should not be called on BSD.");
2116 return false;
2117 }
2118
2119 size_t os::large_page_size() {
2120 return _large_page_size;
2121 }
2122
2123 bool os::can_commit_large_page_memory() {
2124 // Does not matter, we do not support huge pages.
2125 return false;
2126 }
2127
2128 bool os::can_execute_large_page_memory() {
2129 // Does not matter, we do not support huge pages.
2130 return false;
2131 }
2132
2133 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2134 assert(file_desc >= 0, "file_desc is not valid");
2135 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2136 if (result != NULL) {
2137 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2138 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2139 }
2140 }
2141 return result;
2142 }
2143
2144 // Reserve memory at an arbitrary address, only if that area is
2145 // available (and not reserved for something else).
2146
2147 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2148 const int max_tries = 10;
2149 char* base[max_tries];
2150 size_t size[max_tries];
2151 const size_t gap = 0x000000;
2152
2153 // Assert only that the size is a multiple of the page size, since
2154 // that's all that mmap requires, and since that's all we really know
2155 // about at this low abstraction level. If we need higher alignment,
2156 // we can either pass an alignment to this method or verify alignment
2157 // in one of the methods further up the call chain. See bug 5044738.
2158 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2159
2160 // Repeatedly allocate blocks until the block is allocated at the
2161 // right spot.
2162
2163 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2164 // if kernel honors the hint then we can return immediately.
2165 char * addr = anon_mmap(requested_addr, bytes, false);
2166 if (addr == requested_addr) {
2167 return requested_addr;
2168 }
2169
2170 if (addr != NULL) {
2171 // mmap() is successful but it fails to reserve at the requested address
2172 anon_munmap(addr, bytes);
2173 }
2174
2175 int i;
2176 for (i = 0; i < max_tries; ++i) {
2177 base[i] = reserve_memory(bytes);
2178
2179 if (base[i] != NULL) {
2180 // Is this the block we wanted?
2181 if (base[i] == requested_addr) {
2182 size[i] = bytes;
2183 break;
2184 }
2185
2186 // Does this overlap the block we wanted? Give back the overlapped
2187 // parts and try again.
2188
2189 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2190 if (top_overlap >= 0 && top_overlap < bytes) {
2191 unmap_memory(base[i], top_overlap);
2192 base[i] += top_overlap;
2193 size[i] = bytes - top_overlap;
2194 } else {
2195 size_t bottom_overlap = base[i] + bytes - requested_addr;
2196 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2197 unmap_memory(requested_addr, bottom_overlap);
2198 size[i] = bytes - bottom_overlap;
2199 } else {
2200 size[i] = bytes;
2201 }
2202 }
2203 }
2204 }
2205
2206 // Give back the unused reserved pieces.
2207
2208 for (int j = 0; j < i; ++j) {
2209 if (base[j] != NULL) {
2210 unmap_memory(base[j], size[j]);
2211 }
2212 }
2213
2214 if (i < max_tries) {
2215 return requested_addr;
2216 } else {
2217 return NULL;
2218 }
2219 }
2220
2221 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2222 void os::infinite_sleep() {
2223 while (true) { // sleep forever ...
2224 ::sleep(100); // ... 100 seconds at a time
2225 }
2226 }
2227
2228 // Used to convert frequent JVM_Yield() to nops
2229 bool os::dont_yield() {
2230 return DontYieldALot;
2231 }
2232
2233 void os::naked_yield() {
2234 sched_yield();
2235 }
2236
2237 ////////////////////////////////////////////////////////////////////////////////
2238 // thread priority support
2239
2240 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2241 // only supports dynamic priority, static priority must be zero. For real-time
2242 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2243 // However, for large multi-threaded applications, SCHED_RR is not only slower
2244 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2245 // of 5 runs - Sep 2005).
2246 //
2247 // The following code actually changes the niceness of kernel-thread/LWP. It
2248 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2249 // not the entire user process, and user level threads are 1:1 mapped to kernel
2250 // threads. It has always been the case, but could change in the future. For
2251 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2252 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2253 // (e.g., root privilege or CAP_SYS_NICE capability).
2254
2255 #if !defined(__APPLE__)
2256 int os::java_to_os_priority[CriticalPriority + 1] = {
2257 19, // 0 Entry should never be used
2258
2259 0, // 1 MinPriority
2260 3, // 2
2261 6, // 3
2262
2263 10, // 4
2264 15, // 5 NormPriority
2265 18, // 6
2266
2267 21, // 7
2268 25, // 8
2269 28, // 9 NearMaxPriority
2270
2271 31, // 10 MaxPriority
2272
2273 31 // 11 CriticalPriority
2274 };
2275 #else
2276 // Using Mach high-level priority assignments
2277 int os::java_to_os_priority[CriticalPriority + 1] = {
2278 0, // 0 Entry should never be used (MINPRI_USER)
2279
2280 27, // 1 MinPriority
2281 28, // 2
2282 29, // 3
2283
2284 30, // 4
2285 31, // 5 NormPriority (BASEPRI_DEFAULT)
2286 32, // 6
2287
2288 33, // 7
2289 34, // 8
2290 35, // 9 NearMaxPriority
2291
2292 36, // 10 MaxPriority
2293
2294 36 // 11 CriticalPriority
2295 };
2296 #endif
2297
2298 static int prio_init() {
2299 if (ThreadPriorityPolicy == 1) {
2300 if (geteuid() != 0) {
2301 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2302 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2303 "e.g., being the root user. If the necessary permission is not " \
2304 "possessed, changes to priority will be silently ignored.");
2305 }
2306 }
2307 }
2308 if (UseCriticalJavaThreadPriority) {
2309 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2310 }
2311 return 0;
2312 }
2313
2314 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2315 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2316
2317 #ifdef __OpenBSD__
2318 // OpenBSD pthread_setprio starves low priority threads
2319 return OS_OK;
2320 #elif defined(__FreeBSD__)
2321 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2322 return (ret == 0) ? OS_OK : OS_ERR;
2323 #elif defined(__APPLE__) || defined(__NetBSD__)
2324 struct sched_param sp;
2325 int policy;
2326
2327 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2328 return OS_ERR;
2329 }
2330
2331 sp.sched_priority = newpri;
2332 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2333 return OS_ERR;
2334 }
2335
2336 return OS_OK;
2337 #else
2338 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2339 return (ret == 0) ? OS_OK : OS_ERR;
2340 #endif
2341 }
2342
2343 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2344 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2345 *priority_ptr = java_to_os_priority[NormPriority];
2346 return OS_OK;
2347 }
2348
2349 errno = 0;
2350 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2351 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2352 #elif defined(__APPLE__) || defined(__NetBSD__)
2353 int policy;
2354 struct sched_param sp;
2355
2356 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2357 if (res != 0) {
2358 *priority_ptr = -1;
2359 return OS_ERR;
2360 } else {
2361 *priority_ptr = sp.sched_priority;
2362 return OS_OK;
2363 }
2364 #else
2365 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2366 #endif
2367 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2368 }
2369
2370 ////////////////////////////////////////////////////////////////////////////////
2371 // suspend/resume support
2372
2373 // The low-level signal-based suspend/resume support is a remnant from the
2374 // old VM-suspension that used to be for java-suspension, safepoints etc,
2375 // within hotspot. Currently used by JFR's OSThreadSampler
2376 //
2377 // The remaining code is greatly simplified from the more general suspension
2378 // code that used to be used.
2379 //
2380 // The protocol is quite simple:
2381 // - suspend:
2382 // - sends a signal to the target thread
2383 // - polls the suspend state of the osthread using a yield loop
2384 // - target thread signal handler (SR_handler) sets suspend state
2385 // and blocks in sigsuspend until continued
2386 // - resume:
2387 // - sets target osthread state to continue
2388 // - sends signal to end the sigsuspend loop in the SR_handler
2389 //
2390 // Note that the SR_lock plays no role in this suspend/resume protocol,
2391 // but is checked for NULL in SR_handler as a thread termination indicator.
2392 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2393 //
2394 // Note that resume_clear_context() and suspend_save_context() are needed
2395 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2396 // which in part is used by:
2397 // - Forte Analyzer: AsyncGetCallTrace()
2398 // - StackBanging: get_frame_at_stack_banging_point()
2399
2400 static void resume_clear_context(OSThread *osthread) {
2401 osthread->set_ucontext(NULL);
2402 osthread->set_siginfo(NULL);
2403 }
2404
2405 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2406 osthread->set_ucontext(context);
2407 osthread->set_siginfo(siginfo);
2408 }
2409
2410 // Handler function invoked when a thread's execution is suspended or
2411 // resumed. We have to be careful that only async-safe functions are
2412 // called here (Note: most pthread functions are not async safe and
2413 // should be avoided.)
2414 //
2415 // Note: sigwait() is a more natural fit than sigsuspend() from an
2416 // interface point of view, but sigwait() prevents the signal hander
2417 // from being run. libpthread would get very confused by not having
2418 // its signal handlers run and prevents sigwait()'s use with the
2419 // mutex granting granting signal.
2420 //
2421 // Currently only ever called on the VMThread or JavaThread
2422 //
2423 #ifdef __APPLE__
2424 static OSXSemaphore sr_semaphore;
2425 #else
2426 static PosixSemaphore sr_semaphore;
2427 #endif
2428
2429 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2430 // Save and restore errno to avoid confusing native code with EINTR
2431 // after sigsuspend.
2432 int old_errno = errno;
2433
2434 Thread* thread = Thread::current_or_null_safe();
2435 assert(thread != NULL, "Missing current thread in SR_handler");
2436
2437 // On some systems we have seen signal delivery get "stuck" until the signal
2438 // mask is changed as part of thread termination. Check that the current thread
2439 // has not already terminated (via SR_lock()) - else the following assertion
2440 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2441 // destructor has completed.
2442
2443 if (thread->SR_lock() == NULL) {
2444 return;
2445 }
2446
2447 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2448
2449 OSThread* osthread = thread->osthread();
2450
2451 os::SuspendResume::State current = osthread->sr.state();
2452 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2453 suspend_save_context(osthread, siginfo, context);
2454
2455 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2456 os::SuspendResume::State state = osthread->sr.suspended();
2457 if (state == os::SuspendResume::SR_SUSPENDED) {
2458 sigset_t suspend_set; // signals for sigsuspend()
2459
2460 // get current set of blocked signals and unblock resume signal
2461 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2462 sigdelset(&suspend_set, SR_signum);
2463
2464 sr_semaphore.signal();
2465 // wait here until we are resumed
2466 while (1) {
2467 sigsuspend(&suspend_set);
2468
2469 os::SuspendResume::State result = osthread->sr.running();
2470 if (result == os::SuspendResume::SR_RUNNING) {
2471 sr_semaphore.signal();
2472 break;
2473 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2474 ShouldNotReachHere();
2475 }
2476 }
2477
2478 } else if (state == os::SuspendResume::SR_RUNNING) {
2479 // request was cancelled, continue
2480 } else {
2481 ShouldNotReachHere();
2482 }
2483
2484 resume_clear_context(osthread);
2485 } else if (current == os::SuspendResume::SR_RUNNING) {
2486 // request was cancelled, continue
2487 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2488 // ignore
2489 } else {
2490 // ignore
2491 }
2492
2493 errno = old_errno;
2494 }
2495
2496
2497 static int SR_initialize() {
2498 struct sigaction act;
2499 char *s;
2500 // Get signal number to use for suspend/resume
2501 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2502 int sig = ::strtol(s, 0, 10);
2503 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2504 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2505 SR_signum = sig;
2506 } else {
2507 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2508 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2509 }
2510 }
2511
2512 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2513 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2514
2515 sigemptyset(&SR_sigset);
2516 sigaddset(&SR_sigset, SR_signum);
2517
2518 // Set up signal handler for suspend/resume
2519 act.sa_flags = SA_RESTART|SA_SIGINFO;
2520 act.sa_handler = (void (*)(int)) SR_handler;
2521
2522 // SR_signum is blocked by default.
2523 // 4528190 - We also need to block pthread restart signal (32 on all
2524 // supported Bsd platforms). Note that BsdThreads need to block
2525 // this signal for all threads to work properly. So we don't have
2526 // to use hard-coded signal number when setting up the mask.
2527 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2528
2529 if (sigaction(SR_signum, &act, 0) == -1) {
2530 return -1;
2531 }
2532
2533 // Save signal flag
2534 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2535 return 0;
2536 }
2537
2538 static int sr_notify(OSThread* osthread) {
2539 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2540 assert_status(status == 0, status, "pthread_kill");
2541 return status;
2542 }
2543
2544 // "Randomly" selected value for how long we want to spin
2545 // before bailing out on suspending a thread, also how often
2546 // we send a signal to a thread we want to resume
2547 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2548 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2549
2550 // returns true on success and false on error - really an error is fatal
2551 // but this seems the normal response to library errors
2552 static bool do_suspend(OSThread* osthread) {
2553 assert(osthread->sr.is_running(), "thread should be running");
2554 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2555
2556 // mark as suspended and send signal
2557 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2558 // failed to switch, state wasn't running?
2559 ShouldNotReachHere();
2560 return false;
2561 }
2562
2563 if (sr_notify(osthread) != 0) {
2564 ShouldNotReachHere();
2565 }
2566
2567 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2568 while (true) {
2569 if (sr_semaphore.timedwait(2)) {
2570 break;
2571 } else {
2572 // timeout
2573 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2574 if (cancelled == os::SuspendResume::SR_RUNNING) {
2575 return false;
2576 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2577 // make sure that we consume the signal on the semaphore as well
2578 sr_semaphore.wait();
2579 break;
2580 } else {
2581 ShouldNotReachHere();
2582 return false;
2583 }
2584 }
2585 }
2586
2587 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2588 return true;
2589 }
2590
2591 static void do_resume(OSThread* osthread) {
2592 assert(osthread->sr.is_suspended(), "thread should be suspended");
2593 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2594
2595 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2596 // failed to switch to WAKEUP_REQUEST
2597 ShouldNotReachHere();
2598 return;
2599 }
2600
2601 while (true) {
2602 if (sr_notify(osthread) == 0) {
2603 if (sr_semaphore.timedwait(2)) {
2604 if (osthread->sr.is_running()) {
2605 return;
2606 }
2607 }
2608 } else {
2609 ShouldNotReachHere();
2610 }
2611 }
2612
2613 guarantee(osthread->sr.is_running(), "Must be running!");
2614 }
2615
2616 ///////////////////////////////////////////////////////////////////////////////////
2617 // signal handling (except suspend/resume)
2618
2619 // This routine may be used by user applications as a "hook" to catch signals.
2620 // The user-defined signal handler must pass unrecognized signals to this
2621 // routine, and if it returns true (non-zero), then the signal handler must
2622 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2623 // routine will never retun false (zero), but instead will execute a VM panic
2624 // routine kill the process.
2625 //
2626 // If this routine returns false, it is OK to call it again. This allows
2627 // the user-defined signal handler to perform checks either before or after
2628 // the VM performs its own checks. Naturally, the user code would be making
2629 // a serious error if it tried to handle an exception (such as a null check
2630 // or breakpoint) that the VM was generating for its own correct operation.
2631 //
2632 // This routine may recognize any of the following kinds of signals:
2633 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2634 // It should be consulted by handlers for any of those signals.
2635 //
2636 // The caller of this routine must pass in the three arguments supplied
2637 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2638 // field of the structure passed to sigaction(). This routine assumes that
2639 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2640 //
2641 // Note that the VM will print warnings if it detects conflicting signal
2642 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2643 //
2644 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2645 void* ucontext,
2646 int abort_if_unrecognized);
2647
2648 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2649 assert(info != NULL && uc != NULL, "it must be old kernel");
2650 int orig_errno = errno; // Preserve errno value over signal handler.
2651 JVM_handle_bsd_signal(sig, info, uc, true);
2652 errno = orig_errno;
2653 }
2654
2655
2656 // This boolean allows users to forward their own non-matching signals
2657 // to JVM_handle_bsd_signal, harmlessly.
2658 bool os::Bsd::signal_handlers_are_installed = false;
2659
2660 // For signal-chaining
2661 struct sigaction sigact[NSIG];
2662 uint32_t sigs = 0;
2663 #if (32 < NSIG-1)
2664 #error "Not all signals can be encoded in sigs. Adapt its type!"
2665 #endif
2666 bool os::Bsd::libjsig_is_loaded = false;
2667 typedef struct sigaction *(*get_signal_t)(int);
2668 get_signal_t os::Bsd::get_signal_action = NULL;
2669
2670 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2671 struct sigaction *actp = NULL;
2672
2673 if (libjsig_is_loaded) {
2674 // Retrieve the old signal handler from libjsig
2675 actp = (*get_signal_action)(sig);
2676 }
2677 if (actp == NULL) {
2678 // Retrieve the preinstalled signal handler from jvm
2679 actp = get_preinstalled_handler(sig);
2680 }
2681
2682 return actp;
2683 }
2684
2685 static bool call_chained_handler(struct sigaction *actp, int sig,
2686 siginfo_t *siginfo, void *context) {
2687 // Call the old signal handler
2688 if (actp->sa_handler == SIG_DFL) {
2689 // It's more reasonable to let jvm treat it as an unexpected exception
2690 // instead of taking the default action.
2691 return false;
2692 } else if (actp->sa_handler != SIG_IGN) {
2693 if ((actp->sa_flags & SA_NODEFER) == 0) {
2694 // automaticlly block the signal
2695 sigaddset(&(actp->sa_mask), sig);
2696 }
2697
2698 sa_handler_t hand;
2699 sa_sigaction_t sa;
2700 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2701 // retrieve the chained handler
2702 if (siginfo_flag_set) {
2703 sa = actp->sa_sigaction;
2704 } else {
2705 hand = actp->sa_handler;
2706 }
2707
2708 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2709 actp->sa_handler = SIG_DFL;
2710 }
2711
2712 // try to honor the signal mask
2713 sigset_t oset;
2714 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2715
2716 // call into the chained handler
2717 if (siginfo_flag_set) {
2718 (*sa)(sig, siginfo, context);
2719 } else {
2720 (*hand)(sig);
2721 }
2722
2723 // restore the signal mask
2724 pthread_sigmask(SIG_SETMASK, &oset, 0);
2725 }
2726 // Tell jvm's signal handler the signal is taken care of.
2727 return true;
2728 }
2729
2730 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2731 bool chained = false;
2732 // signal-chaining
2733 if (UseSignalChaining) {
2734 struct sigaction *actp = get_chained_signal_action(sig);
2735 if (actp != NULL) {
2736 chained = call_chained_handler(actp, sig, siginfo, context);
2737 }
2738 }
2739 return chained;
2740 }
2741
2742 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
2743 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
2744 return &sigact[sig];
2745 }
2746 return NULL;
2747 }
2748
2749 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
2750 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2751 sigact[sig] = oldAct;
2752 sigs |= (uint32_t)1 << (sig-1);
2753 }
2754
2755 // for diagnostic
2756 int sigflags[NSIG];
2757
2758 int os::Bsd::get_our_sigflags(int sig) {
2759 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2760 return sigflags[sig];
2761 }
2762
2763 void os::Bsd::set_our_sigflags(int sig, int flags) {
2764 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2765 if (sig > 0 && sig < NSIG) {
2766 sigflags[sig] = flags;
2767 }
2768 }
2769
2770 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2771 // Check for overwrite.
2772 struct sigaction oldAct;
2773 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2774
2775 void* oldhand = oldAct.sa_sigaction
2776 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2777 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2778 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2779 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2780 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2781 if (AllowUserSignalHandlers || !set_installed) {
2782 // Do not overwrite; user takes responsibility to forward to us.
2783 return;
2784 } else if (UseSignalChaining) {
2785 // save the old handler in jvm
2786 save_preinstalled_handler(sig, oldAct);
2787 // libjsig also interposes the sigaction() call below and saves the
2788 // old sigaction on it own.
2789 } else {
2790 fatal("Encountered unexpected pre-existing sigaction handler "
2791 "%#lx for signal %d.", (long)oldhand, sig);
2792 }
2793 }
2794
2795 struct sigaction sigAct;
2796 sigfillset(&(sigAct.sa_mask));
2797 sigAct.sa_handler = SIG_DFL;
2798 if (!set_installed) {
2799 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2800 } else {
2801 sigAct.sa_sigaction = signalHandler;
2802 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2803 }
2804 #ifdef __APPLE__
2805 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2806 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2807 // if the signal handler declares it will handle it on alternate stack.
2808 // Notice we only declare we will handle it on alt stack, but we are not
2809 // actually going to use real alt stack - this is just a workaround.
2810 // Please see ux_exception.c, method catch_mach_exception_raise for details
2811 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2812 if (sig == SIGSEGV) {
2813 sigAct.sa_flags |= SA_ONSTACK;
2814 }
2815 #endif
2816
2817 // Save flags, which are set by ours
2818 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2819 sigflags[sig] = sigAct.sa_flags;
2820
2821 int ret = sigaction(sig, &sigAct, &oldAct);
2822 assert(ret == 0, "check");
2823
2824 void* oldhand2 = oldAct.sa_sigaction
2825 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2826 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2827 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2828 }
2829
2830 // install signal handlers for signals that HotSpot needs to
2831 // handle in order to support Java-level exception handling.
2832
2833 void os::Bsd::install_signal_handlers() {
2834 if (!signal_handlers_are_installed) {
2835 signal_handlers_are_installed = true;
2836
2837 // signal-chaining
2838 typedef void (*signal_setting_t)();
2839 signal_setting_t begin_signal_setting = NULL;
2840 signal_setting_t end_signal_setting = NULL;
2841 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2842 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2843 if (begin_signal_setting != NULL) {
2844 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2845 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2846 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2847 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2848 libjsig_is_loaded = true;
2849 assert(UseSignalChaining, "should enable signal-chaining");
2850 }
2851 if (libjsig_is_loaded) {
2852 // Tell libjsig jvm is setting signal handlers
2853 (*begin_signal_setting)();
2854 }
2855
2856 set_signal_handler(SIGSEGV, true);
2857 set_signal_handler(SIGPIPE, true);
2858 set_signal_handler(SIGBUS, true);
2859 set_signal_handler(SIGILL, true);
2860 set_signal_handler(SIGFPE, true);
2861 set_signal_handler(SIGXFSZ, true);
2862
2863 #if defined(__APPLE__)
2864 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2865 // signals caught and handled by the JVM. To work around this, we reset the mach task
2866 // signal handler that's placed on our process by CrashReporter. This disables
2867 // CrashReporter-based reporting.
2868 //
2869 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2870 // on caught fatal signals.
2871 //
2872 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2873 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2874 // exception handling, while leaving the standard BSD signal handlers functional.
2875 kern_return_t kr;
2876 kr = task_set_exception_ports(mach_task_self(),
2877 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2878 MACH_PORT_NULL,
2879 EXCEPTION_STATE_IDENTITY,
2880 MACHINE_THREAD_STATE);
2881
2882 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2883 #endif
2884
2885 if (libjsig_is_loaded) {
2886 // Tell libjsig jvm finishes setting signal handlers
2887 (*end_signal_setting)();
2888 }
2889
2890 // We don't activate signal checker if libjsig is in place, we trust ourselves
2891 // and if UserSignalHandler is installed all bets are off
2892 if (CheckJNICalls) {
2893 if (libjsig_is_loaded) {
2894 if (PrintJNIResolving) {
2895 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
2896 }
2897 check_signals = false;
2898 }
2899 if (AllowUserSignalHandlers) {
2900 if (PrintJNIResolving) {
2901 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2902 }
2903 check_signals = false;
2904 }
2905 }
2906 }
2907 }
2908
2909
2910 /////
2911 // glibc on Bsd platform uses non-documented flag
2912 // to indicate, that some special sort of signal
2913 // trampoline is used.
2914 // We will never set this flag, and we should
2915 // ignore this flag in our diagnostic
2916 #ifdef SIGNIFICANT_SIGNAL_MASK
2917 #undef SIGNIFICANT_SIGNAL_MASK
2918 #endif
2919 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2920
2921 static const char* get_signal_handler_name(address handler,
2922 char* buf, int buflen) {
2923 int offset;
2924 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2925 if (found) {
2926 // skip directory names
2927 const char *p1, *p2;
2928 p1 = buf;
2929 size_t len = strlen(os::file_separator());
2930 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2931 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2932 } else {
2933 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2934 }
2935 return buf;
2936 }
2937
2938 static void print_signal_handler(outputStream* st, int sig,
2939 char* buf, size_t buflen) {
2940 struct sigaction sa;
2941
2942 sigaction(sig, NULL, &sa);
2943
2944 // See comment for SIGNIFICANT_SIGNAL_MASK define
2945 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2946
2947 st->print("%s: ", os::exception_name(sig, buf, buflen));
2948
2949 address handler = (sa.sa_flags & SA_SIGINFO)
2950 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2951 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2952
2953 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2954 st->print("SIG_DFL");
2955 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2956 st->print("SIG_IGN");
2957 } else {
2958 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2959 }
2960
2961 st->print(", sa_mask[0]=");
2962 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2963
2964 address rh = VMError::get_resetted_sighandler(sig);
2965 // May be, handler was resetted by VMError?
2966 if (rh != NULL) {
2967 handler = rh;
2968 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2969 }
2970
2971 st->print(", sa_flags=");
2972 os::Posix::print_sa_flags(st, sa.sa_flags);
2973
2974 // Check: is it our handler?
2975 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2976 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2977 // It is our signal handler
2978 // check for flags, reset system-used one!
2979 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2980 st->print(
2981 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2982 os::Bsd::get_our_sigflags(sig));
2983 }
2984 }
2985 st->cr();
2986 }
2987
2988
2989 #define DO_SIGNAL_CHECK(sig) \
2990 do { \
2991 if (!sigismember(&check_signal_done, sig)) { \
2992 os::Bsd::check_signal_handler(sig); \
2993 } \
2994 } while (0)
2995
2996 // This method is a periodic task to check for misbehaving JNI applications
2997 // under CheckJNI, we can add any periodic checks here
2998
2999 void os::run_periodic_checks() {
3000
3001 if (check_signals == false) return;
3002
3003 // SEGV and BUS if overridden could potentially prevent
3004 // generation of hs*.log in the event of a crash, debugging
3005 // such a case can be very challenging, so we absolutely
3006 // check the following for a good measure:
3007 DO_SIGNAL_CHECK(SIGSEGV);
3008 DO_SIGNAL_CHECK(SIGILL);
3009 DO_SIGNAL_CHECK(SIGFPE);
3010 DO_SIGNAL_CHECK(SIGBUS);
3011 DO_SIGNAL_CHECK(SIGPIPE);
3012 DO_SIGNAL_CHECK(SIGXFSZ);
3013
3014
3015 // ReduceSignalUsage allows the user to override these handlers
3016 // see comments at the very top and jvm_md.h
3017 if (!ReduceSignalUsage) {
3018 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3019 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3020 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3021 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3022 }
3023
3024 DO_SIGNAL_CHECK(SR_signum);
3025 }
3026
3027 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3028
3029 static os_sigaction_t os_sigaction = NULL;
3030
3031 void os::Bsd::check_signal_handler(int sig) {
3032 char buf[O_BUFLEN];
3033 address jvmHandler = NULL;
3034
3035
3036 struct sigaction act;
3037 if (os_sigaction == NULL) {
3038 // only trust the default sigaction, in case it has been interposed
3039 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3040 if (os_sigaction == NULL) return;
3041 }
3042
3043 os_sigaction(sig, (struct sigaction*)NULL, &act);
3044
3045
3046 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3047
3048 address thisHandler = (act.sa_flags & SA_SIGINFO)
3049 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3050 : CAST_FROM_FN_PTR(address, act.sa_handler);
3051
3052
3053 switch (sig) {
3054 case SIGSEGV:
3055 case SIGBUS:
3056 case SIGFPE:
3057 case SIGPIPE:
3058 case SIGILL:
3059 case SIGXFSZ:
3060 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3061 break;
3062
3063 case SHUTDOWN1_SIGNAL:
3064 case SHUTDOWN2_SIGNAL:
3065 case SHUTDOWN3_SIGNAL:
3066 case BREAK_SIGNAL:
3067 jvmHandler = (address)user_handler();
3068 break;
3069
3070 default:
3071 if (sig == SR_signum) {
3072 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3073 } else {
3074 return;
3075 }
3076 break;
3077 }
3078
3079 if (thisHandler != jvmHandler) {
3080 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3081 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3082 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3083 // No need to check this sig any longer
3084 sigaddset(&check_signal_done, sig);
3085 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3086 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3087 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3088 exception_name(sig, buf, O_BUFLEN));
3089 }
3090 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3091 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3092 tty->print("expected:");
3093 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3094 tty->cr();
3095 tty->print(" found:");
3096 os::Posix::print_sa_flags(tty, act.sa_flags);
3097 tty->cr();
3098 // No need to check this sig any longer
3099 sigaddset(&check_signal_done, sig);
3100 }
3101
3102 // Dump all the signal
3103 if (sigismember(&check_signal_done, sig)) {
3104 print_signal_handlers(tty, buf, O_BUFLEN);
3105 }
3106 }
3107
3108 extern void report_error(char* file_name, int line_no, char* title,
3109 char* format, ...);
3110
3111 // this is called _before_ the most of global arguments have been parsed
3112 void os::init(void) {
3113 char dummy; // used to get a guess on initial stack address
3114
3115 // With BsdThreads the JavaMain thread pid (primordial thread)
3116 // is different than the pid of the java launcher thread.
3117 // So, on Bsd, the launcher thread pid is passed to the VM
3118 // via the sun.java.launcher.pid property.
3119 // Use this property instead of getpid() if it was correctly passed.
3120 // See bug 6351349.
3121 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3122
3123 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3124
3125 clock_tics_per_sec = CLK_TCK;
3126
3127 init_random(1234567);
3128
3129 Bsd::set_page_size(getpagesize());
3130 if (Bsd::page_size() == -1) {
3131 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3132 }
3133 init_page_sizes((size_t) Bsd::page_size());
3134
3135 Bsd::initialize_system_info();
3136
3137 // _main_thread points to the thread that created/loaded the JVM.
3138 Bsd::_main_thread = pthread_self();
3139
3140 Bsd::clock_init();
3141 initial_time_count = javaTimeNanos();
3142
3143 os::Posix::init();
3144 }
3145
3146 // To install functions for atexit system call
3147 extern "C" {
3148 static void perfMemory_exit_helper() {
3149 perfMemory_exit();
3150 }
3151 }
3152
3153 // this is called _after_ the global arguments have been parsed
3154 jint os::init_2(void) {
3155
3156 // This could be set after os::Posix::init() but all platforms
3157 // have to set it the same so we have to mirror Solaris.
3158 DEBUG_ONLY(os::set_mutex_init_done();)
3159
3160 os::Posix::init_2();
3161
3162 // initialize suspend/resume support - must do this before signal_sets_init()
3163 if (SR_initialize() != 0) {
3164 perror("SR_initialize failed");
3165 return JNI_ERR;
3166 }
3167
3168 Bsd::signal_sets_init();
3169 Bsd::install_signal_handlers();
3170 // Initialize data for jdk.internal.misc.Signal
3171 if (!ReduceSignalUsage) {
3172 jdk_misc_signal_init();
3173 }
3174
3175 // Check and sets minimum stack sizes against command line options
3176 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3177 return JNI_ERR;
3178 }
3179
3180 if (MaxFDLimit) {
3181 // set the number of file descriptors to max. print out error
3182 // if getrlimit/setrlimit fails but continue regardless.
3183 struct rlimit nbr_files;
3184 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3185 if (status != 0) {
3186 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3187 } else {
3188 nbr_files.rlim_cur = nbr_files.rlim_max;
3189
3190 #ifdef __APPLE__
3191 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3192 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3193 // be used instead
3194 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3195 #endif
3196
3197 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3198 if (status != 0) {
3199 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3200 }
3201 }
3202 }
3203
3204 // at-exit methods are called in the reverse order of their registration.
3205 // atexit functions are called on return from main or as a result of a
3206 // call to exit(3C). There can be only 32 of these functions registered
3207 // and atexit() does not set errno.
3208
3209 if (PerfAllowAtExitRegistration) {
3210 // only register atexit functions if PerfAllowAtExitRegistration is set.
3211 // atexit functions can be delayed until process exit time, which
3212 // can be problematic for embedded VM situations. Embedded VMs should
3213 // call DestroyJavaVM() to assure that VM resources are released.
3214
3215 // note: perfMemory_exit_helper atexit function may be removed in
3216 // the future if the appropriate cleanup code can be added to the
3217 // VM_Exit VMOperation's doit method.
3218 if (atexit(perfMemory_exit_helper) != 0) {
3219 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3220 }
3221 }
3222
3223 // initialize thread priority policy
3224 prio_init();
3225
3226 #ifdef __APPLE__
3227 // dynamically link to objective c gc registration
3228 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3229 if (handleLibObjc != NULL) {
3230 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3231 }
3232 #endif
3233
3234 return JNI_OK;
3235 }
3236
3237 // Mark the polling page as unreadable
3238 void os::make_polling_page_unreadable(void) {
3239 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3240 fatal("Could not disable polling page");
3241 }
3242 }
3243
3244 // Mark the polling page as readable
3245 void os::make_polling_page_readable(void) {
3246 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3247 fatal("Could not enable polling page");
3248 }
3249 }
3250
3251 int os::active_processor_count() {
3252 // User has overridden the number of active processors
3253 if (ActiveProcessorCount > 0) {
3254 log_trace(os)("active_processor_count: "
3255 "active processor count set by user : %d",
3256 ActiveProcessorCount);
3257 return ActiveProcessorCount;
3258 }
3259
3260 return _processor_count;
3261 }
3262
3263 void os::set_native_thread_name(const char *name) {
3264 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3265 // This is only supported in Snow Leopard and beyond
3266 if (name != NULL) {
3267 // Add a "Java: " prefix to the name
3268 char buf[MAXTHREADNAMESIZE];
3269 snprintf(buf, sizeof(buf), "Java: %s", name);
3270 pthread_setname_np(buf);
3271 }
3272 #endif
3273 }
3274
3275 bool os::distribute_processes(uint length, uint* distribution) {
3276 // Not yet implemented.
3277 return false;
3278 }
3279
3280 bool os::bind_to_processor(uint processor_id) {
3281 // Not yet implemented.
3282 return false;
3283 }
3284
3285 void os::SuspendedThreadTask::internal_do_task() {
3286 if (do_suspend(_thread->osthread())) {
3287 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3288 do_task(context);
3289 do_resume(_thread->osthread());
3290 }
3291 }
3292
3293 ////////////////////////////////////////////////////////////////////////////////
3294 // debug support
3295
3296 bool os::find(address addr, outputStream* st) {
3297 Dl_info dlinfo;
3298 memset(&dlinfo, 0, sizeof(dlinfo));
3299 if (dladdr(addr, &dlinfo) != 0) {
3300 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3301 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3302 st->print("%s+%#x", dlinfo.dli_sname,
3303 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3304 } else if (dlinfo.dli_fbase != NULL) {
3305 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3306 } else {
3307 st->print("<absolute address>");
3308 }
3309 if (dlinfo.dli_fname != NULL) {
3310 st->print(" in %s", dlinfo.dli_fname);
3311 }
3312 if (dlinfo.dli_fbase != NULL) {
3313 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3314 }
3315 st->cr();
3316
3317 if (Verbose) {
3318 // decode some bytes around the PC
3319 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3320 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3321 address lowest = (address) dlinfo.dli_sname;
3322 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3323 if (begin < lowest) begin = lowest;
3324 Dl_info dlinfo2;
3325 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3326 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3327 end = (address) dlinfo2.dli_saddr;
3328 }
3329 Disassembler::decode(begin, end, st);
3330 }
3331 return true;
3332 }
3333 return false;
3334 }
3335
3336 ////////////////////////////////////////////////////////////////////////////////
3337 // misc
3338
3339 // This does not do anything on Bsd. This is basically a hook for being
3340 // able to use structured exception handling (thread-local exception filters)
3341 // on, e.g., Win32.
3342 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3343 const methodHandle& method, JavaCallArguments* args,
3344 Thread* thread) {
3345 f(value, method, args, thread);
3346 }
3347
3348 void os::print_statistics() {
3349 }
3350
3351 bool os::message_box(const char* title, const char* message) {
3352 int i;
3353 fdStream err(defaultStream::error_fd());
3354 for (i = 0; i < 78; i++) err.print_raw("=");
3355 err.cr();
3356 err.print_raw_cr(title);
3357 for (i = 0; i < 78; i++) err.print_raw("-");
3358 err.cr();
3359 err.print_raw_cr(message);
3360 for (i = 0; i < 78; i++) err.print_raw("=");
3361 err.cr();
3362
3363 char buf[16];
3364 // Prevent process from exiting upon "read error" without consuming all CPU
3365 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3366
3367 return buf[0] == 'y' || buf[0] == 'Y';
3368 }
3369
3370 static inline struct timespec get_mtime(const char* filename) {
3371 struct stat st;
3372 int ret = os::stat(filename, &st);
3373 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3374 #ifdef __APPLE__
3375 return st.st_mtimespec;
3376 #else
3377 return st.st_mtim;
3378 #endif
3379 }
3380
3381 int os::compare_file_modified_times(const char* file1, const char* file2) {
3382 struct timespec filetime1 = get_mtime(file1);
3383 struct timespec filetime2 = get_mtime(file2);
3384 int diff = filetime1.tv_sec - filetime2.tv_sec;
3385 if (diff == 0) {
3386 return filetime1.tv_nsec - filetime2.tv_nsec;
3387 }
3388 return diff;
3389 }
3390
3391 // Is a (classpath) directory empty?
3392 bool os::dir_is_empty(const char* path) {
3393 DIR *dir = NULL;
3394 struct dirent *ptr;
3395
3396 dir = opendir(path);
3397 if (dir == NULL) return true;
3398
3399 // Scan the directory
3400 bool result = true;
3401 while (result && (ptr = readdir(dir)) != NULL) {
3402 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3403 result = false;
3404 }
3405 }
3406 closedir(dir);
3407 return result;
3408 }
3409
3410 // This code originates from JDK's sysOpen and open64_w
3411 // from src/solaris/hpi/src/system_md.c
3412
3413 int os::open(const char *path, int oflag, int mode) {
3414 if (strlen(path) > MAX_PATH - 1) {
3415 errno = ENAMETOOLONG;
3416 return -1;
3417 }
3418 int fd;
3419
3420 fd = ::open(path, oflag, mode);
3421 if (fd == -1) return -1;
3422
3423 // If the open succeeded, the file might still be a directory
3424 {
3425 struct stat buf;
3426 int ret = ::fstat(fd, &buf);
3427 int st_mode = buf.st_mode;
3428
3429 if (ret != -1) {
3430 if ((st_mode & S_IFMT) == S_IFDIR) {
3431 errno = EISDIR;
3432 ::close(fd);
3433 return -1;
3434 }
3435 } else {
3436 ::close(fd);
3437 return -1;
3438 }
3439 }
3440
3441 // All file descriptors that are opened in the JVM and not
3442 // specifically destined for a subprocess should have the
3443 // close-on-exec flag set. If we don't set it, then careless 3rd
3444 // party native code might fork and exec without closing all
3445 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3446 // UNIXProcess.c), and this in turn might:
3447 //
3448 // - cause end-of-file to fail to be detected on some file
3449 // descriptors, resulting in mysterious hangs, or
3450 //
3451 // - might cause an fopen in the subprocess to fail on a system
3452 // suffering from bug 1085341.
3453 //
3454 // (Yes, the default setting of the close-on-exec flag is a Unix
3455 // design flaw)
3456 //
3457 // See:
3458 // 1085341: 32-bit stdio routines should support file descriptors >255
3459 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3460 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3461 //
3462 #ifdef FD_CLOEXEC
3463 {
3464 int flags = ::fcntl(fd, F_GETFD);
3465 if (flags != -1) {
3466 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3467 }
3468 }
3469 #endif
3470
3471 return fd;
3472 }
3473
3474
3475 // create binary file, rewriting existing file if required
3476 int os::create_binary_file(const char* path, bool rewrite_existing) {
3477 int oflags = O_WRONLY | O_CREAT;
3478 if (!rewrite_existing) {
3479 oflags |= O_EXCL;
3480 }
3481 return ::open(path, oflags, S_IREAD | S_IWRITE);
3482 }
3483
3484 // return current position of file pointer
3485 jlong os::current_file_offset(int fd) {
3486 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3487 }
3488
3489 // move file pointer to the specified offset
3490 jlong os::seek_to_file_offset(int fd, jlong offset) {
3491 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3492 }
3493
3494 // This code originates from JDK's sysAvailable
3495 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3496
3497 int os::available(int fd, jlong *bytes) {
3498 jlong cur, end;
3499 int mode;
3500 struct stat buf;
3501
3502 if (::fstat(fd, &buf) >= 0) {
3503 mode = buf.st_mode;
3504 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3505 int n;
3506 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3507 *bytes = n;
3508 return 1;
3509 }
3510 }
3511 }
3512 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3513 return 0;
3514 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3515 return 0;
3516 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3517 return 0;
3518 }
3519 *bytes = end - cur;
3520 return 1;
3521 }
3522
3523 // Map a block of memory.
3524 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3525 char *addr, size_t bytes, bool read_only,
3526 bool allow_exec) {
3527 int prot;
3528 int flags;
3529
3530 if (read_only) {
3531 prot = PROT_READ;
3532 flags = MAP_SHARED;
3533 } else {
3534 prot = PROT_READ | PROT_WRITE;
3535 flags = MAP_PRIVATE;
3536 }
3537
3538 if (allow_exec) {
3539 prot |= PROT_EXEC;
3540 }
3541
3542 if (addr != NULL) {
3543 flags |= MAP_FIXED;
3544 }
3545
3546 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3547 fd, file_offset);
3548 if (mapped_address == MAP_FAILED) {
3549 return NULL;
3550 }
3551 return mapped_address;
3552 }
3553
3554
3555 // Remap a block of memory.
3556 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3557 char *addr, size_t bytes, bool read_only,
3558 bool allow_exec) {
3559 // same as map_memory() on this OS
3560 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3561 allow_exec);
3562 }
3563
3564
3565 // Unmap a block of memory.
3566 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3567 return munmap(addr, bytes) == 0;
3568 }
3569
3570 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3571 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3572 // of a thread.
3573 //
3574 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3575 // the fast estimate available on the platform.
3576
3577 jlong os::current_thread_cpu_time() {
3578 #ifdef __APPLE__
3579 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3580 #else
3581 Unimplemented();
3582 return 0;
3583 #endif
3584 }
3585
3586 jlong os::thread_cpu_time(Thread* thread) {
3587 #ifdef __APPLE__
3588 return os::thread_cpu_time(thread, true /* user + sys */);
3589 #else
3590 Unimplemented();
3591 return 0;
3592 #endif
3593 }
3594
3595 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3596 #ifdef __APPLE__
3597 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3598 #else
3599 Unimplemented();
3600 return 0;
3601 #endif
3602 }
3603
3604 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3605 #ifdef __APPLE__
3606 struct thread_basic_info tinfo;
3607 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3608 kern_return_t kr;
3609 thread_t mach_thread;
3610
3611 mach_thread = thread->osthread()->thread_id();
3612 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3613 if (kr != KERN_SUCCESS) {
3614 return -1;
3615 }
3616
3617 if (user_sys_cpu_time) {
3618 jlong nanos;
3619 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3620 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3621 return nanos;
3622 } else {
3623 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3624 }
3625 #else
3626 Unimplemented();
3627 return 0;
3628 #endif
3629 }
3630
3631
3632 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3633 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3634 info_ptr->may_skip_backward = false; // elapsed time not wall time
3635 info_ptr->may_skip_forward = false; // elapsed time not wall time
3636 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3637 }
3638
3639 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3640 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3641 info_ptr->may_skip_backward = false; // elapsed time not wall time
3642 info_ptr->may_skip_forward = false; // elapsed time not wall time
3643 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3644 }
3645
3646 bool os::is_thread_cpu_time_supported() {
3647 #ifdef __APPLE__
3648 return true;
3649 #else
3650 return false;
3651 #endif
3652 }
3653
3654 // System loadavg support. Returns -1 if load average cannot be obtained.
3655 // Bsd doesn't yet have a (official) notion of processor sets,
3656 // so just return the system wide load average.
3657 int os::loadavg(double loadavg[], int nelem) {
3658 return ::getloadavg(loadavg, nelem);
3659 }
3660
3661 void os::pause() {
3662 char filename[MAX_PATH];
3663 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3664 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3665 } else {
3666 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3667 }
3668
3669 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3670 if (fd != -1) {
3671 struct stat buf;
3672 ::close(fd);
3673 while (::stat(filename, &buf) == 0) {
3674 (void)::poll(NULL, 0, 100);
3675 }
3676 } else {
3677 jio_fprintf(stderr,
3678 "Could not open pause file '%s', continuing immediately.\n", filename);
3679 }
3680 }
3681
3682 // Darwin has no "environ" in a dynamic library.
3683 #ifdef __APPLE__
3684 #include <crt_externs.h>
3685 #define environ (*_NSGetEnviron())
3686 #else
3687 extern char** environ;
3688 #endif
3689
3690 // Run the specified command in a separate process. Return its exit value,
3691 // or -1 on failure (e.g. can't fork a new process).
3692 // Unlike system(), this function can be called from signal handler. It
3693 // doesn't block SIGINT et al.
3694 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3695 const char * argv[4] = {"sh", "-c", cmd, NULL};
3696
3697 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3698 // pthread_atfork handlers and reset pthread library. All we need is a
3699 // separate process to execve. Make a direct syscall to fork process.
3700 // On IA64 there's no fork syscall, we have to use fork() and hope for
3701 // the best...
3702 pid_t pid = fork();
3703
3704 if (pid < 0) {
3705 // fork failed
3706 return -1;
3707
3708 } else if (pid == 0) {
3709 // child process
3710
3711 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3712 // first to kill every thread on the thread list. Because this list is
3713 // not reset by fork() (see notes above), execve() will instead kill
3714 // every thread in the parent process. We know this is the only thread
3715 // in the new process, so make a system call directly.
3716 // IA64 should use normal execve() from glibc to match the glibc fork()
3717 // above.
3718 execve("/bin/sh", (char* const*)argv, environ);
3719
3720 // execve failed
3721 _exit(-1);
3722
3723 } else {
3724 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3725 // care about the actual exit code, for now.
3726
3727 int status;
3728
3729 // Wait for the child process to exit. This returns immediately if
3730 // the child has already exited. */
3731 while (waitpid(pid, &status, 0) < 0) {
3732 switch (errno) {
3733 case ECHILD: return 0;
3734 case EINTR: break;
3735 default: return -1;
3736 }
3737 }
3738
3739 if (WIFEXITED(status)) {
3740 // The child exited normally; get its exit code.
3741 return WEXITSTATUS(status);
3742 } else if (WIFSIGNALED(status)) {
3743 // The child exited because of a signal
3744 // The best value to return is 0x80 + signal number,
3745 // because that is what all Unix shells do, and because
3746 // it allows callers to distinguish between process exit and
3747 // process death by signal.
3748 return 0x80 + WTERMSIG(status);
3749 } else {
3750 // Unknown exit code; pass it through
3751 return status;
3752 }
3753 }
3754 }
3755
3756 // Get the default path to the core file
3757 // Returns the length of the string
3758 int os::get_core_path(char* buffer, size_t bufferSize) {
3759 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
3760
3761 // Truncate if theoretical string was longer than bufferSize
3762 n = MIN2(n, (int)bufferSize);
3763
3764 return n;
3765 }
3766
3767 #ifndef PRODUCT
3768 void TestReserveMemorySpecial_test() {
3769 // No tests available for this platform
3770 }
3771 #endif
3772
3773 bool os::start_debugging(char *buf, int buflen) {
3774 int len = (int)strlen(buf);
3775 char *p = &buf[len];
3776
3777 jio_snprintf(p, buflen-len,
3778 "\n\n"
3779 "Do you want to debug the problem?\n\n"
3780 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3781 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3782 "Otherwise, press RETURN to abort...",
3783 os::current_process_id(), os::current_process_id(),
3784 os::current_thread_id(), os::current_thread_id());
3785
3786 bool yes = os::message_box("Unexpected Error", buf);
3787
3788 if (yes) {
3789 // yes, user asked VM to launch debugger
3790 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3791 os::current_process_id(), os::current_process_id());
3792
3793 os::fork_and_exec(buf);
3794 yes = false;
3795 }
3796 return yes;
3797 }