1 /*
2 * Copyright (c) 1999, 2018, 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_share_bsd.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/interfaceSupport.inline.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/orderAccess.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/semaphore.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/memTracker.hpp"
64 #include "services/runtimeService.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 // put OS-includes here
73 # include <dlfcn.h>
74 # include <errno.h>
75 # include <fcntl.h>
76 # include <inttypes.h>
77 # include <poll.h>
78 # include <pthread.h>
79 # include <pwd.h>
80 # include <signal.h>
81 # include <stdint.h>
82 # include <stdio.h>
83 # include <string.h>
84 # include <sys/ioctl.h>
85 # include <sys/mman.h>
86 # include <sys/param.h>
87 # include <sys/resource.h>
88 # include <sys/socket.h>
89 # include <sys/stat.h>
90 # include <sys/syscall.h>
91 # include <sys/sysctl.h>
92 # include <sys/time.h>
93 # include <sys/times.h>
94 # include <sys/types.h>
95 # include <sys/wait.h>
96 # include <time.h>
97 # include <unistd.h>
98
99 #if defined(__FreeBSD__) || defined(__NetBSD__)
100 #include <elf.h>
101 #endif
102
103 #ifdef __APPLE__
104 #include <mach-o/dyld.h>
105 #endif
106
107 #ifndef MAP_ANONYMOUS
108 #define MAP_ANONYMOUS MAP_ANON
109 #endif
110
111 #define MAX_PATH (2 * K)
112
113 // for timer info max values which include all bits
114 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
115
116 ////////////////////////////////////////////////////////////////////////////////
117 // global variables
118 julong os::Bsd::_physical_memory = 0;
119
120 #ifdef __APPLE__
121 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
122 volatile uint64_t os::Bsd::_max_abstime = 0;
123 #else
124 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
125 #endif
126 pthread_t os::Bsd::_main_thread;
127 int os::Bsd::_page_size = -1;
128
129 static jlong initial_time_count=0;
130
131 static int clock_tics_per_sec = 100;
132
133 // For diagnostics to print a message once. see run_periodic_checks
134 static sigset_t check_signal_done;
135 static bool check_signals = true;
136
137 static pid_t _initial_pid = 0;
138
139 // Signal number used to suspend/resume a thread
140
141 // do not use any signal number less than SIGSEGV, see 4355769
142 static int SR_signum = SIGUSR2;
143 sigset_t SR_sigset;
144
145
146 ////////////////////////////////////////////////////////////////////////////////
147 // utility functions
148
149 static int SR_initialize();
150
151 julong os::available_memory() {
152 return Bsd::available_memory();
153 }
154
155 // available here means free
156 julong os::Bsd::available_memory() {
157 uint64_t available = physical_memory() >> 2;
158 #ifdef __APPLE__
159 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
160 vm_statistics64_data_t vmstat;
161 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
162 (host_info64_t)&vmstat, &count);
163 assert(kerr == KERN_SUCCESS,
164 "host_statistics64 failed - check mach_host_self() and count");
165 if (kerr == KERN_SUCCESS) {
166 available = vmstat.free_count * os::vm_page_size();
167 }
168 #endif
169 return available;
170 }
171
172 julong os::physical_memory() {
173 return Bsd::physical_memory();
174 }
175
176 // Return true if user is running as root.
177
178 bool os::have_special_privileges() {
179 static bool init = false;
180 static bool privileges = false;
181 if (!init) {
182 privileges = (getuid() != geteuid()) || (getgid() != getegid());
183 init = true;
184 }
185 return privileges;
186 }
187
188
189
190 // Cpu architecture string
191 #if defined(ZERO)
192 static char cpu_arch[] = ZERO_LIBARCH;
193 #elif defined(IA64)
194 static char cpu_arch[] = "ia64";
195 #elif defined(IA32)
196 static char cpu_arch[] = "i386";
197 #elif defined(AMD64)
198 static char cpu_arch[] = "amd64";
199 #elif defined(ARM)
200 static char cpu_arch[] = "arm";
201 #elif defined(PPC32)
202 static char cpu_arch[] = "ppc";
203 #elif defined(SPARC)
204 #ifdef _LP64
205 static char cpu_arch[] = "sparcv9";
206 #else
207 static char cpu_arch[] = "sparc";
208 #endif
209 #else
210 #error Add appropriate cpu_arch setting
211 #endif
212
213 // Compiler variant
214 #ifdef COMPILER2
215 #define COMPILER_VARIANT "server"
216 #else
217 #define COMPILER_VARIANT "client"
218 #endif
219
220
221 void os::Bsd::initialize_system_info() {
222 int mib[2];
223 size_t len;
224 int cpu_val;
225 julong mem_val;
226
227 // get processors count via hw.ncpus sysctl
228 mib[0] = CTL_HW;
229 mib[1] = HW_NCPU;
230 len = sizeof(cpu_val);
231 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
232 assert(len == sizeof(cpu_val), "unexpected data size");
233 set_processor_count(cpu_val);
234 } else {
235 set_processor_count(1); // fallback
236 }
237
238 // get physical memory via hw.memsize sysctl (hw.memsize is used
239 // since it returns a 64 bit value)
240 mib[0] = CTL_HW;
241
242 #if defined (HW_MEMSIZE) // Apple
243 mib[1] = HW_MEMSIZE;
244 #elif defined(HW_PHYSMEM) // Most of BSD
245 mib[1] = HW_PHYSMEM;
246 #elif defined(HW_REALMEM) // Old FreeBSD
247 mib[1] = HW_REALMEM;
248 #else
249 #error No ways to get physmem
250 #endif
251
252 len = sizeof(mem_val);
253 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
254 assert(len == sizeof(mem_val), "unexpected data size");
255 _physical_memory = mem_val;
256 } else {
257 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
258 }
259
260 #ifdef __OpenBSD__
261 {
262 // limit _physical_memory memory view on OpenBSD since
263 // datasize rlimit restricts us anyway.
264 struct rlimit limits;
265 getrlimit(RLIMIT_DATA, &limits);
266 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
267 }
268 #endif
269 }
270
271 #ifdef __APPLE__
272 static const char *get_home() {
273 const char *home_dir = ::getenv("HOME");
274 if ((home_dir == NULL) || (*home_dir == '\0')) {
275 struct passwd *passwd_info = getpwuid(geteuid());
276 if (passwd_info != NULL) {
277 home_dir = passwd_info->pw_dir;
278 }
279 }
280
281 return home_dir;
282 }
283 #endif
284
285 void os::init_system_properties_values() {
286 // The next steps are taken in the product version:
287 //
288 // Obtain the JAVA_HOME value from the location of libjvm.so.
289 // This library should be located at:
290 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
291 //
292 // If "/jre/lib/" appears at the right place in the path, then we
293 // assume libjvm.so is installed in a JDK and we use this path.
294 //
295 // Otherwise exit with message: "Could not create the Java virtual machine."
296 //
297 // The following extra steps are taken in the debugging version:
298 //
299 // If "/jre/lib/" does NOT appear at the right place in the path
300 // instead of exit check for $JAVA_HOME environment variable.
301 //
302 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
303 // then we append a fake suffix "hotspot/libjvm.so" to this path so
304 // it looks like libjvm.so is installed there
305 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
306 //
307 // Otherwise exit.
308 //
309 // Important note: if the location of libjvm.so changes this
310 // code needs to be changed accordingly.
311
312 // See ld(1):
313 // The linker uses the following search paths to locate required
314 // shared libraries:
315 // 1: ...
316 // ...
317 // 7: The default directories, normally /lib and /usr/lib.
318 #ifndef DEFAULT_LIBPATH
319 #ifndef OVERRIDE_LIBPATH
320 #define DEFAULT_LIBPATH "/lib:/usr/lib"
321 #else
322 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
323 #endif
324 #endif
325
326 // Base path of extensions installed on the system.
327 #define SYS_EXT_DIR "/usr/java/packages"
328 #define EXTENSIONS_DIR "/lib/ext"
329
330 #ifndef __APPLE__
331
332 // Buffer that fits several sprintfs.
333 // Note that the space for the colon and the trailing null are provided
334 // by the nulls included by the sizeof operator.
335 const size_t bufsize =
336 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
337 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
338 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
339
340 // sysclasspath, java_home, dll_dir
341 {
342 char *pslash;
343 os::jvm_path(buf, bufsize);
344
345 // Found the full path to libjvm.so.
346 // Now cut the path to <java_home>/jre if we can.
347 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
348 pslash = strrchr(buf, '/');
349 if (pslash != NULL) {
350 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
351 }
352 Arguments::set_dll_dir(buf);
353
354 if (pslash != NULL) {
355 pslash = strrchr(buf, '/');
356 if (pslash != NULL) {
357 *pslash = '\0'; // Get rid of /<arch>.
358 pslash = strrchr(buf, '/');
359 if (pslash != NULL) {
360 *pslash = '\0'; // Get rid of /lib.
361 }
362 }
363 }
364 Arguments::set_java_home(buf);
365 if (!set_boot_path('/', ':')) {
366 vm_exit_during_initialization("Failed setting boot class path.", NULL);
367 }
368 }
369
370 // Where to look for native libraries.
371 //
372 // Note: Due to a legacy implementation, most of the library path
373 // is set in the launcher. This was to accomodate linking restrictions
374 // on legacy Bsd implementations (which are no longer supported).
375 // Eventually, all the library path setting will be done here.
376 //
377 // However, to prevent the proliferation of improperly built native
378 // libraries, the new path component /usr/java/packages is added here.
379 // Eventually, all the library path setting will be done here.
380 {
381 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
382 // should always exist (until the legacy problem cited above is
383 // addressed).
384 const char *v = ::getenv("LD_LIBRARY_PATH");
385 const char *v_colon = ":";
386 if (v == NULL) { v = ""; v_colon = ""; }
387 // That's +1 for the colon and +1 for the trailing '\0'.
388 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
389 strlen(v) + 1 +
390 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
391 mtInternal);
392 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
393 Arguments::set_library_path(ld_library_path);
394 FREE_C_HEAP_ARRAY(char, ld_library_path);
395 }
396
397 // Extensions directories.
398 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
399 Arguments::set_ext_dirs(buf);
400
401 FREE_C_HEAP_ARRAY(char, buf);
402
403 #else // __APPLE__
404
405 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
406 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
407
408 const char *user_home_dir = get_home();
409 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
410 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
411 sizeof(SYS_EXTENSIONS_DIRS);
412
413 // Buffer that fits several sprintfs.
414 // Note that the space for the colon and the trailing null are provided
415 // by the nulls included by the sizeof operator.
416 const size_t bufsize =
417 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
418 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
419 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
420
421 // sysclasspath, java_home, dll_dir
422 {
423 char *pslash;
424 os::jvm_path(buf, bufsize);
425
426 // Found the full path to libjvm.so.
427 // Now cut the path to <java_home>/jre if we can.
428 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
429 pslash = strrchr(buf, '/');
430 if (pslash != NULL) {
431 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
432 }
433 #ifdef STATIC_BUILD
434 strcat(buf, "/lib");
435 #endif
436
437 Arguments::set_dll_dir(buf);
438
439 if (pslash != NULL) {
440 pslash = strrchr(buf, '/');
441 if (pslash != NULL) {
442 *pslash = '\0'; // Get rid of /lib.
443 }
444 }
445 Arguments::set_java_home(buf);
446 set_boot_path('/', ':');
447 }
448
449 // Where to look for native libraries.
450 //
451 // Note: Due to a legacy implementation, most of the library path
452 // is set in the launcher. This was to accomodate linking restrictions
453 // on legacy Bsd implementations (which are no longer supported).
454 // Eventually, all the library path setting will be done here.
455 //
456 // However, to prevent the proliferation of improperly built native
457 // libraries, the new path component /usr/java/packages is added here.
458 // Eventually, all the library path setting will be done here.
459 {
460 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
461 // should always exist (until the legacy problem cited above is
462 // addressed).
463 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
464 // can specify a directory inside an app wrapper
465 const char *l = ::getenv("JAVA_LIBRARY_PATH");
466 const char *l_colon = ":";
467 if (l == NULL) { l = ""; l_colon = ""; }
468
469 const char *v = ::getenv("DYLD_LIBRARY_PATH");
470 const char *v_colon = ":";
471 if (v == NULL) { v = ""; v_colon = ""; }
472
473 // Apple's Java6 has "." at the beginning of java.library.path.
474 // OpenJDK on Windows has "." at the end of java.library.path.
475 // OpenJDK on Linux and Solaris don't have "." in java.library.path
476 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
477 // "." is appended to the end of java.library.path. Yes, this
478 // could cause a change in behavior, but Apple's Java6 behavior
479 // can be achieved by putting "." at the beginning of the
480 // JAVA_LIBRARY_PATH environment variable.
481 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
482 strlen(v) + 1 + strlen(l) + 1 +
483 system_ext_size + 3,
484 mtInternal);
485 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
486 v, v_colon, l, l_colon, user_home_dir);
487 Arguments::set_library_path(ld_library_path);
488 FREE_C_HEAP_ARRAY(char, ld_library_path);
489 }
490
491 // Extensions directories.
492 //
493 // Note that the space for the colon and the trailing null are provided
494 // by the nulls included by the sizeof operator (so actually one byte more
495 // than necessary is allocated).
496 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
497 user_home_dir, Arguments::get_java_home());
498 Arguments::set_ext_dirs(buf);
499
500 FREE_C_HEAP_ARRAY(char, buf);
501
502 #undef SYS_EXTENSIONS_DIR
503 #undef SYS_EXTENSIONS_DIRS
504
505 #endif // __APPLE__
506
507 #undef SYS_EXT_DIR
508 #undef EXTENSIONS_DIR
509 }
510
511 ////////////////////////////////////////////////////////////////////////////////
512 // breakpoint support
513
514 void os::breakpoint() {
515 BREAKPOINT;
516 }
517
518 extern "C" void breakpoint() {
519 // use debugger to set breakpoint here
520 }
521
522 ////////////////////////////////////////////////////////////////////////////////
523 // signal support
524
525 debug_only(static bool signal_sets_initialized = false);
526 static sigset_t unblocked_sigs, vm_sigs;
527
528 void os::Bsd::signal_sets_init() {
529 // Should also have an assertion stating we are still single-threaded.
530 assert(!signal_sets_initialized, "Already initialized");
531 // Fill in signals that are necessarily unblocked for all threads in
532 // the VM. Currently, we unblock the following signals:
533 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
534 // by -Xrs (=ReduceSignalUsage));
535 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
536 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
537 // the dispositions or masks wrt these signals.
538 // Programs embedding the VM that want to use the above signals for their
539 // own purposes must, at this time, use the "-Xrs" option to prevent
540 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
541 // (See bug 4345157, and other related bugs).
542 // In reality, though, unblocking these signals is really a nop, since
543 // these signals are not blocked by default.
544 sigemptyset(&unblocked_sigs);
545 sigaddset(&unblocked_sigs, SIGILL);
546 sigaddset(&unblocked_sigs, SIGSEGV);
547 sigaddset(&unblocked_sigs, SIGBUS);
548 sigaddset(&unblocked_sigs, SIGFPE);
549 sigaddset(&unblocked_sigs, SR_signum);
550
551 if (!ReduceSignalUsage) {
552 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
553 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
554
555 }
556 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
557 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
558 }
559 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
560 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
561 }
562 }
563 // Fill in signals that are blocked by all but the VM thread.
564 sigemptyset(&vm_sigs);
565 if (!ReduceSignalUsage) {
566 sigaddset(&vm_sigs, BREAK_SIGNAL);
567 }
568 debug_only(signal_sets_initialized = true);
569
570 }
571
572 // These are signals that are unblocked while a thread is running Java.
573 // (For some reason, they get blocked by default.)
574 sigset_t* os::Bsd::unblocked_signals() {
575 assert(signal_sets_initialized, "Not initialized");
576 return &unblocked_sigs;
577 }
578
579 // These are the signals that are blocked while a (non-VM) thread is
580 // running Java. Only the VM thread handles these signals.
581 sigset_t* os::Bsd::vm_signals() {
582 assert(signal_sets_initialized, "Not initialized");
583 return &vm_sigs;
584 }
585
586 void os::Bsd::hotspot_sigmask(Thread* thread) {
587
588 //Save caller's signal mask before setting VM signal mask
589 sigset_t caller_sigmask;
590 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
591
592 OSThread* osthread = thread->osthread();
593 osthread->set_caller_sigmask(caller_sigmask);
594
595 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
596
597 if (!ReduceSignalUsage) {
598 if (thread->is_VM_thread()) {
599 // Only the VM thread handles BREAK_SIGNAL ...
600 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
601 } else {
602 // ... all other threads block BREAK_SIGNAL
603 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
604 }
605 }
606 }
607
608
609 //////////////////////////////////////////////////////////////////////////////
610 // create new thread
611
612 #ifdef __APPLE__
613 // library handle for calling objc_registerThreadWithCollector()
614 // without static linking to the libobjc library
615 #define OBJC_LIB "/usr/lib/libobjc.dylib"
616 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
617 typedef void (*objc_registerThreadWithCollector_t)();
618 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
619 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
620 #endif
621
622 #ifdef __APPLE__
623 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
624 // Additional thread_id used to correlate threads in SA
625 thread_identifier_info_data_t m_ident_info;
626 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
627
628 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
629 (thread_info_t) &m_ident_info, &count);
630
631 return m_ident_info.thread_id;
632 }
633 #endif
634
635 // Thread start routine for all newly created threads
636 static void *thread_native_entry(Thread *thread) {
637
638 thread->record_stack_base_and_size();
639
640 // Try to randomize the cache line index of hot stack frames.
641 // This helps when threads of the same stack traces evict each other's
642 // cache lines. The threads can be either from the same JVM instance, or
643 // from different JVM instances. The benefit is especially true for
644 // processors with hyperthreading technology.
645 static int counter = 0;
646 int pid = os::current_process_id();
647 alloca(((pid ^ counter++) & 7) * 128);
648
649 thread->initialize_thread_current();
650
651 OSThread* osthread = thread->osthread();
652 Monitor* sync = osthread->startThread_lock();
653
654 osthread->set_thread_id(os::Bsd::gettid());
655
656 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
657 os::current_thread_id(), (uintx) pthread_self());
658
659 #ifdef __APPLE__
660 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
661 guarantee(unique_thread_id != 0, "unique thread id was not found");
662 osthread->set_unique_thread_id(unique_thread_id);
663 #endif
664 // initialize signal mask for this thread
665 os::Bsd::hotspot_sigmask(thread);
666
667 // initialize floating point control register
668 os::Bsd::init_thread_fpu_state();
669
670 #ifdef __APPLE__
671 // register thread with objc gc
672 if (objc_registerThreadWithCollectorFunction != NULL) {
673 objc_registerThreadWithCollectorFunction();
674 }
675 #endif
676
677 // handshaking with parent thread
678 {
679 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
680
681 // notify parent thread
682 osthread->set_state(INITIALIZED);
683 sync->notify_all();
684
685 // wait until os::start_thread()
686 while (osthread->get_state() == INITIALIZED) {
687 sync->wait(Mutex::_no_safepoint_check_flag);
688 }
689 }
690
691 // call one more level start routine
692 thread->call_run();
693
694 // Note: at this point the thread object may already have deleted itself.
695 // Prevent dereferencing it from here on out.
696 thread = NULL;
697
698 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
699 os::current_thread_id(), (uintx) pthread_self());
700
701 return 0;
702 }
703
704 bool os::create_thread(Thread* thread, ThreadType thr_type,
705 size_t req_stack_size) {
706 assert(thread->osthread() == NULL, "caller responsible");
707
708 // Allocate the OSThread object
709 OSThread* osthread = new OSThread(NULL, NULL);
710 if (osthread == NULL) {
711 return false;
712 }
713
714 // set the correct thread state
715 osthread->set_thread_type(thr_type);
716
717 // Initial state is ALLOCATED but not INITIALIZED
718 osthread->set_state(ALLOCATED);
719
720 thread->set_osthread(osthread);
721
722 // init thread attributes
723 pthread_attr_t attr;
724 pthread_attr_init(&attr);
725 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
726
727 // calculate stack size if it's not specified by caller
728 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
729 int status = pthread_attr_setstacksize(&attr, stack_size);
730 assert_status(status == 0, status, "pthread_attr_setstacksize");
731
732 ThreadState state;
733
734 {
735 pthread_t tid;
736 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
737
738 char buf[64];
739 if (ret == 0) {
740 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
741 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
742 } else {
743 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
744 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
745 }
746
747 pthread_attr_destroy(&attr);
748
749 if (ret != 0) {
750 // Need to clean up stuff we've allocated so far
751 thread->set_osthread(NULL);
752 delete osthread;
753 return false;
754 }
755
756 // Store pthread info into the OSThread
757 osthread->set_pthread_id(tid);
758
759 // Wait until child thread is either initialized or aborted
760 {
761 Monitor* sync_with_child = osthread->startThread_lock();
762 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
763 while ((state = osthread->get_state()) == ALLOCATED) {
764 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
765 }
766 }
767
768 }
769
770 // Aborted due to thread limit being reached
771 if (state == ZOMBIE) {
772 thread->set_osthread(NULL);
773 delete osthread;
774 return false;
775 }
776
777 // The thread is returned suspended (in state INITIALIZED),
778 // and is started higher up in the call chain
779 assert(state == INITIALIZED, "race condition");
780 return true;
781 }
782
783 /////////////////////////////////////////////////////////////////////////////
784 // attach existing thread
785
786 // bootstrap the main thread
787 bool os::create_main_thread(JavaThread* thread) {
788 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
789 return create_attached_thread(thread);
790 }
791
792 bool os::create_attached_thread(JavaThread* thread) {
793 #ifdef ASSERT
794 thread->verify_not_published();
795 #endif
796
797 // Allocate the OSThread object
798 OSThread* osthread = new OSThread(NULL, NULL);
799
800 if (osthread == NULL) {
801 return false;
802 }
803
804 osthread->set_thread_id(os::Bsd::gettid());
805
806 // Store pthread info into the OSThread
807 #ifdef __APPLE__
808 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
809 guarantee(unique_thread_id != 0, "just checking");
810 osthread->set_unique_thread_id(unique_thread_id);
811 #endif
812 osthread->set_pthread_id(::pthread_self());
813
814 // initialize floating point control register
815 os::Bsd::init_thread_fpu_state();
816
817 // Initial thread state is RUNNABLE
818 osthread->set_state(RUNNABLE);
819
820 thread->set_osthread(osthread);
821
822 // initialize signal mask for this thread
823 // and save the caller's signal mask
824 os::Bsd::hotspot_sigmask(thread);
825
826 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
827 os::current_thread_id(), (uintx) pthread_self());
828
829 return true;
830 }
831
832 void os::pd_start_thread(Thread* thread) {
833 OSThread * osthread = thread->osthread();
834 assert(osthread->get_state() != INITIALIZED, "just checking");
835 Monitor* sync_with_child = osthread->startThread_lock();
836 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
837 sync_with_child->notify();
838 }
839
840 // Free Bsd resources related to the OSThread
841 void os::free_thread(OSThread* osthread) {
842 assert(osthread != NULL, "osthread not set");
843
844 // We are told to free resources of the argument thread,
845 // but we can only really operate on the current thread.
846 assert(Thread::current()->osthread() == osthread,
847 "os::free_thread but not current thread");
848
849 // Restore caller's signal mask
850 sigset_t sigmask = osthread->caller_sigmask();
851 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
852
853 delete osthread;
854 }
855
856 ////////////////////////////////////////////////////////////////////////////////
857 // time support
858
859 // Time since start-up in seconds to a fine granularity.
860 // Used by VMSelfDestructTimer and the MemProfiler.
861 double os::elapsedTime() {
862
863 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
864 }
865
866 jlong os::elapsed_counter() {
867 return javaTimeNanos() - initial_time_count;
868 }
869
870 jlong os::elapsed_frequency() {
871 return NANOSECS_PER_SEC; // nanosecond resolution
872 }
873
874 bool os::supports_vtime() { return true; }
875 bool os::enable_vtime() { return false; }
876 bool os::vtime_enabled() { return false; }
877
878 double os::elapsedVTime() {
879 // better than nothing, but not much
880 return elapsedTime();
881 }
882
883 jlong os::javaTimeMillis() {
884 timeval time;
885 int status = gettimeofday(&time, NULL);
886 assert(status != -1, "bsd error");
887 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
888 }
889
890 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
891 timeval time;
892 int status = gettimeofday(&time, NULL);
893 assert(status != -1, "bsd error");
894 seconds = jlong(time.tv_sec);
895 nanos = jlong(time.tv_usec) * 1000;
896 }
897
898 #ifndef __APPLE__
899 #ifndef CLOCK_MONOTONIC
900 #define CLOCK_MONOTONIC (1)
901 #endif
902 #endif
903
904 #ifdef __APPLE__
905 void os::Bsd::clock_init() {
906 mach_timebase_info(&_timebase_info);
907 }
908 #else
909 void os::Bsd::clock_init() {
910 struct timespec res;
911 struct timespec tp;
912 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
913 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
914 // yes, monotonic clock is supported
915 _clock_gettime = ::clock_gettime;
916 }
917 }
918 #endif
919
920
921
922 #ifdef __APPLE__
923
924 jlong os::javaTimeNanos() {
925 const uint64_t tm = mach_absolute_time();
926 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
927 const uint64_t prev = Bsd::_max_abstime;
928 if (now <= prev) {
929 return prev; // same or retrograde time;
930 }
931 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
932 assert(obsv >= prev, "invariant"); // Monotonicity
933 // If the CAS succeeded then we're done and return "now".
934 // If the CAS failed and the observed value "obsv" is >= now then
935 // we should return "obsv". If the CAS failed and now > obsv > prv then
936 // some other thread raced this thread and installed a new value, in which case
937 // we could either (a) retry the entire operation, (b) retry trying to install now
938 // or (c) just return obsv. We use (c). No loop is required although in some cases
939 // we might discard a higher "now" value in deference to a slightly lower but freshly
940 // installed obsv value. That's entirely benign -- it admits no new orderings compared
941 // to (a) or (b) -- and greatly reduces coherence traffic.
942 // We might also condition (c) on the magnitude of the delta between obsv and now.
943 // Avoiding excessive CAS operations to hot RW locations is critical.
944 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
945 return (prev == obsv) ? now : obsv;
946 }
947
948 #else // __APPLE__
949
950 jlong os::javaTimeNanos() {
951 if (os::supports_monotonic_clock()) {
952 struct timespec tp;
953 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
954 assert(status == 0, "gettime error");
955 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
956 return result;
957 } else {
958 timeval time;
959 int status = gettimeofday(&time, NULL);
960 assert(status != -1, "bsd error");
961 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
962 return 1000 * usecs;
963 }
964 }
965
966 #endif // __APPLE__
967
968 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
969 if (os::supports_monotonic_clock()) {
970 info_ptr->max_value = ALL_64_BITS;
971
972 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
973 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
974 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
975 } else {
976 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
977 info_ptr->max_value = ALL_64_BITS;
978
979 // gettimeofday is a real time clock so it skips
980 info_ptr->may_skip_backward = true;
981 info_ptr->may_skip_forward = true;
982 }
983
984 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
985 }
986
987 // Return the real, user, and system times in seconds from an
988 // arbitrary fixed point in the past.
989 bool os::getTimesSecs(double* process_real_time,
990 double* process_user_time,
991 double* process_system_time) {
992 struct tms ticks;
993 clock_t real_ticks = times(&ticks);
994
995 if (real_ticks == (clock_t) (-1)) {
996 return false;
997 } else {
998 double ticks_per_second = (double) clock_tics_per_sec;
999 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1000 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1001 *process_real_time = ((double) real_ticks) / ticks_per_second;
1002
1003 return true;
1004 }
1005 }
1006
1007
1008 char * os::local_time_string(char *buf, size_t buflen) {
1009 struct tm t;
1010 time_t long_time;
1011 time(&long_time);
1012 localtime_r(&long_time, &t);
1013 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1014 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1015 t.tm_hour, t.tm_min, t.tm_sec);
1016 return buf;
1017 }
1018
1019 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1020 return localtime_r(clock, res);
1021 }
1022
1023 ////////////////////////////////////////////////////////////////////////////////
1024 // runtime exit support
1025
1026 // Note: os::shutdown() might be called very early during initialization, or
1027 // called from signal handler. Before adding something to os::shutdown(), make
1028 // sure it is async-safe and can handle partially initialized VM.
1029 void os::shutdown() {
1030
1031 // allow PerfMemory to attempt cleanup of any persistent resources
1032 perfMemory_exit();
1033
1034 // needs to remove object in file system
1035 AttachListener::abort();
1036
1037 // flush buffered output, finish log files
1038 ostream_abort();
1039
1040 // Check for abort hook
1041 abort_hook_t abort_hook = Arguments::abort_hook();
1042 if (abort_hook != NULL) {
1043 abort_hook();
1044 }
1045
1046 }
1047
1048 // Note: os::abort() might be called very early during initialization, or
1049 // called from signal handler. Before adding something to os::abort(), make
1050 // sure it is async-safe and can handle partially initialized VM.
1051 void os::abort(bool dump_core, void* siginfo, const void* context) {
1052 os::shutdown();
1053 if (dump_core) {
1054 #ifndef PRODUCT
1055 fdStream out(defaultStream::output_fd());
1056 out.print_raw("Current thread is ");
1057 char buf[16];
1058 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1059 out.print_raw_cr(buf);
1060 out.print_raw_cr("Dumping core ...");
1061 #endif
1062 ::abort(); // dump core
1063 }
1064
1065 ::exit(1);
1066 }
1067
1068 // Die immediately, no exit hook, no abort hook, no cleanup.
1069 void os::die() {
1070 // _exit() on BsdThreads only kills current thread
1071 ::abort();
1072 }
1073
1074 // Information of current thread in variety of formats
1075 pid_t os::Bsd::gettid() {
1076 int retval = -1;
1077
1078 #ifdef __APPLE__ //XNU kernel
1079 // despite the fact mach port is actually not a thread id use it
1080 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1081 retval = ::pthread_mach_thread_np(::pthread_self());
1082 guarantee(retval != 0, "just checking");
1083 return retval;
1084
1085 #else
1086 #ifdef __FreeBSD__
1087 retval = syscall(SYS_thr_self);
1088 #else
1089 #ifdef __OpenBSD__
1090 retval = syscall(SYS_getthrid);
1091 #else
1092 #ifdef __NetBSD__
1093 retval = (pid_t) syscall(SYS__lwp_self);
1094 #endif
1095 #endif
1096 #endif
1097 #endif
1098
1099 if (retval == -1) {
1100 return getpid();
1101 }
1102 }
1103
1104 intx os::current_thread_id() {
1105 #ifdef __APPLE__
1106 return (intx)::pthread_mach_thread_np(::pthread_self());
1107 #else
1108 return (intx)::pthread_self();
1109 #endif
1110 }
1111
1112 int os::current_process_id() {
1113
1114 // Under the old bsd thread library, bsd gives each thread
1115 // its own process id. Because of this each thread will return
1116 // a different pid if this method were to return the result
1117 // of getpid(2). Bsd provides no api that returns the pid
1118 // of the launcher thread for the vm. This implementation
1119 // returns a unique pid, the pid of the launcher thread
1120 // that starts the vm 'process'.
1121
1122 // Under the NPTL, getpid() returns the same pid as the
1123 // launcher thread rather than a unique pid per thread.
1124 // Use gettid() if you want the old pre NPTL behaviour.
1125
1126 // if you are looking for the result of a call to getpid() that
1127 // returns a unique pid for the calling thread, then look at the
1128 // OSThread::thread_id() method in osThread_bsd.hpp file
1129
1130 return (int)(_initial_pid ? _initial_pid : getpid());
1131 }
1132
1133 // DLL functions
1134
1135 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1136
1137 // This must be hard coded because it's the system's temporary
1138 // directory not the java application's temp directory, ala java.io.tmpdir.
1139 #ifdef __APPLE__
1140 // macosx has a secure per-user temporary directory
1141 char temp_path_storage[PATH_MAX];
1142 const char* os::get_temp_directory() {
1143 static char *temp_path = NULL;
1144 if (temp_path == NULL) {
1145 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1146 if (pathSize == 0 || pathSize > PATH_MAX) {
1147 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1148 }
1149 temp_path = temp_path_storage;
1150 }
1151 return temp_path;
1152 }
1153 #else // __APPLE__
1154 const char* os::get_temp_directory() { return "/tmp"; }
1155 #endif // __APPLE__
1156
1157 // check if addr is inside libjvm.so
1158 bool os::address_is_in_vm(address addr) {
1159 static address libjvm_base_addr;
1160 Dl_info dlinfo;
1161
1162 if (libjvm_base_addr == NULL) {
1163 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1164 libjvm_base_addr = (address)dlinfo.dli_fbase;
1165 }
1166 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1167 }
1168
1169 if (dladdr((void *)addr, &dlinfo) != 0) {
1170 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1171 }
1172
1173 return false;
1174 }
1175
1176
1177 #define MACH_MAXSYMLEN 256
1178
1179 bool os::dll_address_to_function_name(address addr, char *buf,
1180 int buflen, int *offset,
1181 bool demangle) {
1182 // buf is not optional, but offset is optional
1183 assert(buf != NULL, "sanity check");
1184
1185 Dl_info dlinfo;
1186 char localbuf[MACH_MAXSYMLEN];
1187
1188 if (dladdr((void*)addr, &dlinfo) != 0) {
1189 // see if we have a matching symbol
1190 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1191 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1192 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1193 }
1194 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1195 return true;
1196 }
1197 // no matching symbol so try for just file info
1198 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1199 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1200 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1201 return true;
1202 }
1203 }
1204
1205 // Handle non-dynamic manually:
1206 if (dlinfo.dli_fbase != NULL &&
1207 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1208 dlinfo.dli_fbase)) {
1209 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1210 jio_snprintf(buf, buflen, "%s", localbuf);
1211 }
1212 return true;
1213 }
1214 }
1215 buf[0] = '\0';
1216 if (offset != NULL) *offset = -1;
1217 return false;
1218 }
1219
1220 // ported from solaris version
1221 bool os::dll_address_to_library_name(address addr, char* buf,
1222 int buflen, int* offset) {
1223 // buf is not optional, but offset is optional
1224 assert(buf != NULL, "sanity check");
1225
1226 Dl_info dlinfo;
1227
1228 if (dladdr((void*)addr, &dlinfo) != 0) {
1229 if (dlinfo.dli_fname != NULL) {
1230 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1231 }
1232 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1233 *offset = addr - (address)dlinfo.dli_fbase;
1234 }
1235 return true;
1236 }
1237
1238 buf[0] = '\0';
1239 if (offset) *offset = -1;
1240 return false;
1241 }
1242
1243 // Loads .dll/.so and
1244 // in case of error it checks if .dll/.so was built for the
1245 // same architecture as Hotspot is running on
1246
1247 #ifdef __APPLE__
1248 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1249 #ifdef STATIC_BUILD
1250 return os::get_default_process_handle();
1251 #else
1252 void * result= ::dlopen(filename, RTLD_LAZY);
1253 if (result != NULL) {
1254 // Successful loading
1255 return result;
1256 }
1257
1258 // Read system error message into ebuf
1259 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1260 ebuf[ebuflen-1]='\0';
1261
1262 return NULL;
1263 #endif // STATIC_BUILD
1264 }
1265 #else
1266 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1267 #ifdef STATIC_BUILD
1268 return os::get_default_process_handle();
1269 #else
1270 void * result= ::dlopen(filename, RTLD_LAZY);
1271 if (result != NULL) {
1272 // Successful loading
1273 return result;
1274 }
1275
1276 Elf32_Ehdr elf_head;
1277
1278 // Read system error message into ebuf
1279 // It may or may not be overwritten below
1280 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1281 ebuf[ebuflen-1]='\0';
1282 int diag_msg_max_length=ebuflen-strlen(ebuf);
1283 char* diag_msg_buf=ebuf+strlen(ebuf);
1284
1285 if (diag_msg_max_length==0) {
1286 // No more space in ebuf for additional diagnostics message
1287 return NULL;
1288 }
1289
1290
1291 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1292
1293 if (file_descriptor < 0) {
1294 // Can't open library, report dlerror() message
1295 return NULL;
1296 }
1297
1298 bool failed_to_read_elf_head=
1299 (sizeof(elf_head)!=
1300 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1301
1302 ::close(file_descriptor);
1303 if (failed_to_read_elf_head) {
1304 // file i/o error - report dlerror() msg
1305 return NULL;
1306 }
1307
1308 typedef struct {
1309 Elf32_Half code; // Actual value as defined in elf.h
1310 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1311 char elf_class; // 32 or 64 bit
1312 char endianess; // MSB or LSB
1313 char* name; // String representation
1314 } arch_t;
1315
1316 #ifndef EM_486
1317 #define EM_486 6 /* Intel 80486 */
1318 #endif
1319
1320 #ifndef EM_MIPS_RS3_LE
1321 #define EM_MIPS_RS3_LE 10 /* MIPS */
1322 #endif
1323
1324 #ifndef EM_PPC64
1325 #define EM_PPC64 21 /* PowerPC64 */
1326 #endif
1327
1328 #ifndef EM_S390
1329 #define EM_S390 22 /* IBM System/390 */
1330 #endif
1331
1332 #ifndef EM_IA_64
1333 #define EM_IA_64 50 /* HP/Intel IA-64 */
1334 #endif
1335
1336 #ifndef EM_X86_64
1337 #define EM_X86_64 62 /* AMD x86-64 */
1338 #endif
1339
1340 static const arch_t arch_array[]={
1341 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1342 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1343 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1344 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1345 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1346 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1347 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1348 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1349 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1350 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1351 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1352 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1353 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1354 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1355 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1356 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1357 };
1358
1359 #if (defined IA32)
1360 static Elf32_Half running_arch_code=EM_386;
1361 #elif (defined AMD64)
1362 static Elf32_Half running_arch_code=EM_X86_64;
1363 #elif (defined IA64)
1364 static Elf32_Half running_arch_code=EM_IA_64;
1365 #elif (defined __sparc) && (defined _LP64)
1366 static Elf32_Half running_arch_code=EM_SPARCV9;
1367 #elif (defined __sparc) && (!defined _LP64)
1368 static Elf32_Half running_arch_code=EM_SPARC;
1369 #elif (defined __powerpc64__)
1370 static Elf32_Half running_arch_code=EM_PPC64;
1371 #elif (defined __powerpc__)
1372 static Elf32_Half running_arch_code=EM_PPC;
1373 #elif (defined ARM)
1374 static Elf32_Half running_arch_code=EM_ARM;
1375 #elif (defined S390)
1376 static Elf32_Half running_arch_code=EM_S390;
1377 #elif (defined ALPHA)
1378 static Elf32_Half running_arch_code=EM_ALPHA;
1379 #elif (defined MIPSEL)
1380 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1381 #elif (defined PARISC)
1382 static Elf32_Half running_arch_code=EM_PARISC;
1383 #elif (defined MIPS)
1384 static Elf32_Half running_arch_code=EM_MIPS;
1385 #elif (defined M68K)
1386 static Elf32_Half running_arch_code=EM_68K;
1387 #else
1388 #error Method os::dll_load requires that one of following is defined:\
1389 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1390 #endif
1391
1392 // Identify compatability class for VM's architecture and library's architecture
1393 // Obtain string descriptions for architectures
1394
1395 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1396 int running_arch_index=-1;
1397
1398 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1399 if (running_arch_code == arch_array[i].code) {
1400 running_arch_index = i;
1401 }
1402 if (lib_arch.code == arch_array[i].code) {
1403 lib_arch.compat_class = arch_array[i].compat_class;
1404 lib_arch.name = arch_array[i].name;
1405 }
1406 }
1407
1408 assert(running_arch_index != -1,
1409 "Didn't find running architecture code (running_arch_code) in arch_array");
1410 if (running_arch_index == -1) {
1411 // Even though running architecture detection failed
1412 // we may still continue with reporting dlerror() message
1413 return NULL;
1414 }
1415
1416 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1417 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1418 return NULL;
1419 }
1420
1421 #ifndef S390
1422 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1423 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1424 return NULL;
1425 }
1426 #endif // !S390
1427
1428 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1429 if (lib_arch.name!=NULL) {
1430 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1431 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1432 lib_arch.name, arch_array[running_arch_index].name);
1433 } else {
1434 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1435 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1436 lib_arch.code,
1437 arch_array[running_arch_index].name);
1438 }
1439 }
1440
1441 return NULL;
1442 #endif // STATIC_BUILD
1443 }
1444 #endif // !__APPLE__
1445
1446 void* os::get_default_process_handle() {
1447 #ifdef __APPLE__
1448 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1449 // to avoid finding unexpected symbols on second (or later)
1450 // loads of a library.
1451 return (void*)::dlopen(NULL, RTLD_FIRST);
1452 #else
1453 return (void*)::dlopen(NULL, RTLD_LAZY);
1454 #endif
1455 }
1456
1457 // XXX: Do we need a lock around this as per Linux?
1458 void* os::dll_lookup(void* handle, const char* name) {
1459 return dlsym(handle, name);
1460 }
1461
1462 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1463 outputStream * out = (outputStream *) param;
1464 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1465 return 0;
1466 }
1467
1468 void os::print_dll_info(outputStream *st) {
1469 st->print_cr("Dynamic libraries:");
1470 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1471 st->print_cr("Error: Cannot print dynamic libraries.");
1472 }
1473 }
1474
1475 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1476 #ifdef RTLD_DI_LINKMAP
1477 Dl_info dli;
1478 void *handle;
1479 Link_map *map;
1480 Link_map *p;
1481
1482 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1483 dli.dli_fname == NULL) {
1484 return 1;
1485 }
1486 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1487 if (handle == NULL) {
1488 return 1;
1489 }
1490 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1491 if (map == NULL) {
1492 dlclose(handle);
1493 return 1;
1494 }
1495
1496 while (map->l_prev != NULL)
1497 map = map->l_prev;
1498
1499 while (map != NULL) {
1500 // Value for top_address is returned as 0 since we don't have any information about module size
1501 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1502 dlclose(handle);
1503 return 1;
1504 }
1505 map = map->l_next;
1506 }
1507
1508 dlclose(handle);
1509 #elif defined(__APPLE__)
1510 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1511 // Value for top_address is returned as 0 since we don't have any information about module size
1512 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1513 return 1;
1514 }
1515 }
1516 return 0;
1517 #else
1518 return 1;
1519 #endif
1520 }
1521
1522 void os::get_summary_os_info(char* buf, size_t buflen) {
1523 // These buffers are small because we want this to be brief
1524 // and not use a lot of stack while generating the hs_err file.
1525 char os[100];
1526 size_t size = sizeof(os);
1527 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1528 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1529 #ifdef __APPLE__
1530 strncpy(os, "Darwin", sizeof(os));
1531 #elif __OpenBSD__
1532 strncpy(os, "OpenBSD", sizeof(os));
1533 #else
1534 strncpy(os, "BSD", sizeof(os));
1535 #endif
1536 }
1537
1538 char release[100];
1539 size = sizeof(release);
1540 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1541 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1542 // if error, leave blank
1543 strncpy(release, "", sizeof(release));
1544 }
1545 snprintf(buf, buflen, "%s %s", os, release);
1546 }
1547
1548 void os::print_os_info_brief(outputStream* st) {
1549 os::Posix::print_uname_info(st);
1550 }
1551
1552 void os::print_os_info(outputStream* st) {
1553 st->print("OS:");
1554
1555 os::Posix::print_uname_info(st);
1556
1557 os::Posix::print_rlimit_info(st);
1558
1559 os::Posix::print_load_average(st);
1560 }
1561
1562 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1563 // Nothing to do for now.
1564 }
1565
1566 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1567 unsigned int mhz;
1568 size_t size = sizeof(mhz);
1569 int mib[] = { CTL_HW, HW_CPU_FREQ };
1570 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1571 mhz = 1; // looks like an error but can be divided by
1572 } else {
1573 mhz /= 1000000; // reported in millions
1574 }
1575
1576 char model[100];
1577 size = sizeof(model);
1578 int mib_model[] = { CTL_HW, HW_MODEL };
1579 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1580 strncpy(model, cpu_arch, sizeof(model));
1581 }
1582
1583 char machine[100];
1584 size = sizeof(machine);
1585 int mib_machine[] = { CTL_HW, HW_MACHINE };
1586 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1587 strncpy(machine, "", sizeof(machine));
1588 }
1589
1590 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1591 }
1592
1593 void os::print_memory_info(outputStream* st) {
1594
1595 st->print("Memory:");
1596 st->print(" %dk page", os::vm_page_size()>>10);
1597
1598 st->print(", physical " UINT64_FORMAT "k",
1599 os::physical_memory() >> 10);
1600 st->print("(" UINT64_FORMAT "k free)",
1601 os::available_memory() >> 10);
1602 st->cr();
1603 }
1604
1605 static void print_signal_handler(outputStream* st, int sig,
1606 char* buf, size_t buflen);
1607
1608 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1609 st->print_cr("Signal Handlers:");
1610 print_signal_handler(st, SIGSEGV, buf, buflen);
1611 print_signal_handler(st, SIGBUS , buf, buflen);
1612 print_signal_handler(st, SIGFPE , buf, buflen);
1613 print_signal_handler(st, SIGPIPE, buf, buflen);
1614 print_signal_handler(st, SIGXFSZ, buf, buflen);
1615 print_signal_handler(st, SIGILL , buf, buflen);
1616 print_signal_handler(st, SR_signum, buf, buflen);
1617 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1618 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1619 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1620 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1621 }
1622
1623 static char saved_jvm_path[MAXPATHLEN] = {0};
1624
1625 // Find the full path to the current module, libjvm
1626 void os::jvm_path(char *buf, jint buflen) {
1627 // Error checking.
1628 if (buflen < MAXPATHLEN) {
1629 assert(false, "must use a large-enough buffer");
1630 buf[0] = '\0';
1631 return;
1632 }
1633 // Lazy resolve the path to current module.
1634 if (saved_jvm_path[0] != 0) {
1635 strcpy(buf, saved_jvm_path);
1636 return;
1637 }
1638
1639 char dli_fname[MAXPATHLEN];
1640 bool ret = dll_address_to_library_name(
1641 CAST_FROM_FN_PTR(address, os::jvm_path),
1642 dli_fname, sizeof(dli_fname), NULL);
1643 assert(ret, "cannot locate libjvm");
1644 char *rp = NULL;
1645 if (ret && dli_fname[0] != '\0') {
1646 rp = os::Posix::realpath(dli_fname, buf, buflen);
1647 }
1648 if (rp == NULL) {
1649 return;
1650 }
1651
1652 if (Arguments::sun_java_launcher_is_altjvm()) {
1653 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1654 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1655 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1656 // appears at the right place in the string, then assume we are
1657 // installed in a JDK and we're done. Otherwise, check for a
1658 // JAVA_HOME environment variable and construct a path to the JVM
1659 // being overridden.
1660
1661 const char *p = buf + strlen(buf) - 1;
1662 for (int count = 0; p > buf && count < 5; ++count) {
1663 for (--p; p > buf && *p != '/'; --p)
1664 /* empty */ ;
1665 }
1666
1667 if (strncmp(p, "/jre/lib/", 9) != 0) {
1668 // Look for JAVA_HOME in the environment.
1669 char* java_home_var = ::getenv("JAVA_HOME");
1670 if (java_home_var != NULL && java_home_var[0] != 0) {
1671 char* jrelib_p;
1672 int len;
1673
1674 // Check the current module name "libjvm"
1675 p = strrchr(buf, '/');
1676 assert(strstr(p, "/libjvm") == p, "invalid library name");
1677
1678 rp = os::Posix::realpath(java_home_var, buf, buflen);
1679 if (rp == NULL) {
1680 return;
1681 }
1682
1683 // determine if this is a legacy image or modules image
1684 // modules image doesn't have "jre" subdirectory
1685 len = strlen(buf);
1686 assert(len < buflen, "Ran out of buffer space");
1687 jrelib_p = buf + len;
1688
1689 // Add the appropriate library subdir
1690 snprintf(jrelib_p, buflen-len, "/jre/lib");
1691 if (0 != access(buf, F_OK)) {
1692 snprintf(jrelib_p, buflen-len, "/lib");
1693 }
1694
1695 // Add the appropriate client or server subdir
1696 len = strlen(buf);
1697 jrelib_p = buf + len;
1698 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1699 if (0 != access(buf, F_OK)) {
1700 snprintf(jrelib_p, buflen-len, "%s", "");
1701 }
1702
1703 // If the path exists within JAVA_HOME, add the JVM library name
1704 // to complete the path to JVM being overridden. Otherwise fallback
1705 // to the path to the current library.
1706 if (0 == access(buf, F_OK)) {
1707 // Use current module name "libjvm"
1708 len = strlen(buf);
1709 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1710 } else {
1711 // Fall back to path of current library
1712 rp = os::Posix::realpath(dli_fname, buf, buflen);
1713 if (rp == NULL) {
1714 return;
1715 }
1716 }
1717 }
1718 }
1719 }
1720
1721 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1722 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1723 }
1724
1725 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1726 // no prefix required, not even "_"
1727 }
1728
1729 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1730 // no suffix required
1731 }
1732
1733 ////////////////////////////////////////////////////////////////////////////////
1734 // sun.misc.Signal support
1735
1736 static volatile jint sigint_count = 0;
1737
1738 static void UserHandler(int sig, void *siginfo, void *context) {
1739 // 4511530 - sem_post is serialized and handled by the manager thread. When
1740 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1741 // don't want to flood the manager thread with sem_post requests.
1742 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1743 return;
1744 }
1745
1746 // Ctrl-C is pressed during error reporting, likely because the error
1747 // handler fails to abort. Let VM die immediately.
1748 if (sig == SIGINT && VMError::is_error_reported()) {
1749 os::die();
1750 }
1751
1752 os::signal_notify(sig);
1753 }
1754
1755 void* os::user_handler() {
1756 return CAST_FROM_FN_PTR(void*, UserHandler);
1757 }
1758
1759 extern "C" {
1760 typedef void (*sa_handler_t)(int);
1761 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1762 }
1763
1764 void* os::signal(int signal_number, void* handler) {
1765 struct sigaction sigAct, oldSigAct;
1766
1767 sigfillset(&(sigAct.sa_mask));
1768 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1769 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1770
1771 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1772 // -1 means registration failed
1773 return (void *)-1;
1774 }
1775
1776 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1777 }
1778
1779 void os::signal_raise(int signal_number) {
1780 ::raise(signal_number);
1781 }
1782
1783 // The following code is moved from os.cpp for making this
1784 // code platform specific, which it is by its very nature.
1785
1786 // Will be modified when max signal is changed to be dynamic
1787 int os::sigexitnum_pd() {
1788 return NSIG;
1789 }
1790
1791 // a counter for each possible signal value
1792 static volatile jint pending_signals[NSIG+1] = { 0 };
1793 static Semaphore* sig_sem = NULL;
1794
1795 static void jdk_misc_signal_init() {
1796 // Initialize signal structures
1797 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1798
1799 // Initialize signal semaphore
1800 sig_sem = new Semaphore();
1801 }
1802
1803 void os::signal_notify(int sig) {
1804 if (sig_sem != NULL) {
1805 Atomic::inc(&pending_signals[sig]);
1806 sig_sem->signal();
1807 } else {
1808 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1809 // initialization isn't called.
1810 assert(ReduceSignalUsage, "signal semaphore should be created");
1811 }
1812 }
1813
1814 static int check_pending_signals() {
1815 Atomic::store(0, &sigint_count);
1816 for (;;) {
1817 for (int i = 0; i < NSIG + 1; i++) {
1818 jint n = pending_signals[i];
1819 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1820 return i;
1821 }
1822 }
1823 JavaThread *thread = JavaThread::current();
1824 ThreadBlockInVM tbivm(thread);
1825
1826 bool threadIsSuspended;
1827 do {
1828 thread->set_suspend_equivalent();
1829 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1830 sig_sem->wait();
1831
1832 // were we externally suspended while we were waiting?
1833 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1834 if (threadIsSuspended) {
1835 // The semaphore has been incremented, but while we were waiting
1836 // another thread suspended us. We don't want to continue running
1837 // while suspended because that would surprise the thread that
1838 // suspended us.
1839 sig_sem->signal();
1840
1841 thread->java_suspend_self();
1842 }
1843 } while (threadIsSuspended);
1844 }
1845 }
1846
1847 int os::signal_wait() {
1848 return check_pending_signals();
1849 }
1850
1851 ////////////////////////////////////////////////////////////////////////////////
1852 // Virtual Memory
1853
1854 int os::vm_page_size() {
1855 // Seems redundant as all get out
1856 assert(os::Bsd::page_size() != -1, "must call os::init");
1857 return os::Bsd::page_size();
1858 }
1859
1860 // Solaris allocates memory by pages.
1861 int os::vm_allocation_granularity() {
1862 assert(os::Bsd::page_size() != -1, "must call os::init");
1863 return os::Bsd::page_size();
1864 }
1865
1866 // Rationale behind this function:
1867 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1868 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1869 // samples for JITted code. Here we create private executable mapping over the code cache
1870 // and then we can use standard (well, almost, as mapping can change) way to provide
1871 // info for the reporting script by storing timestamp and location of symbol
1872 void bsd_wrap_code(char* base, size_t size) {
1873 static volatile jint cnt = 0;
1874
1875 if (!UseOprofile) {
1876 return;
1877 }
1878
1879 char buf[PATH_MAX + 1];
1880 int num = Atomic::add(1, &cnt);
1881
1882 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1883 os::get_temp_directory(), os::current_process_id(), num);
1884 unlink(buf);
1885
1886 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1887
1888 if (fd != -1) {
1889 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1890 if (rv != (off_t)-1) {
1891 if (::write(fd, "", 1) == 1) {
1892 mmap(base, size,
1893 PROT_READ|PROT_WRITE|PROT_EXEC,
1894 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1895 }
1896 }
1897 ::close(fd);
1898 unlink(buf);
1899 }
1900 }
1901
1902 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1903 int err) {
1904 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1905 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1906 os::errno_name(err), err);
1907 }
1908
1909 // NOTE: Bsd kernel does not really reserve the pages for us.
1910 // All it does is to check if there are enough free pages
1911 // left at the time of mmap(). This could be a potential
1912 // problem.
1913 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1914 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1915 #ifdef __OpenBSD__
1916 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1917 if (::mprotect(addr, size, prot) == 0) {
1918 return true;
1919 }
1920 #else
1921 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1922 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1923 if (res != (uintptr_t) MAP_FAILED) {
1924 return true;
1925 }
1926 #endif
1927
1928 // Warn about any commit errors we see in non-product builds just
1929 // in case mmap() doesn't work as described on the man page.
1930 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1931
1932 return false;
1933 }
1934
1935 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1936 bool exec) {
1937 // alignment_hint is ignored on this OS
1938 return pd_commit_memory(addr, size, exec);
1939 }
1940
1941 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1942 const char* mesg) {
1943 assert(mesg != NULL, "mesg must be specified");
1944 if (!pd_commit_memory(addr, size, exec)) {
1945 // add extra info in product mode for vm_exit_out_of_memory():
1946 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1947 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1948 }
1949 }
1950
1951 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1952 size_t alignment_hint, bool exec,
1953 const char* mesg) {
1954 // alignment_hint is ignored on this OS
1955 pd_commit_memory_or_exit(addr, size, exec, mesg);
1956 }
1957
1958 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1959 }
1960
1961 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
1962 ::madvise(addr, bytes, MADV_DONTNEED);
1963 }
1964
1965 void os::numa_make_global(char *addr, size_t bytes) {
1966 }
1967
1968 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
1969 }
1970
1971 bool os::numa_topology_changed() { return false; }
1972
1973 size_t os::numa_get_groups_num() {
1974 return 1;
1975 }
1976
1977 int os::numa_get_group_id() {
1978 return 0;
1979 }
1980
1981 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
1982 if (size > 0) {
1983 ids[0] = 0;
1984 return 1;
1985 }
1986 return 0;
1987 }
1988
1989 bool os::get_page_info(char *start, page_info* info) {
1990 return false;
1991 }
1992
1993 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
1994 return end;
1995 }
1996
1997
1998 bool os::pd_uncommit_memory(char* addr, size_t size) {
1999 #ifdef __OpenBSD__
2000 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2001 return ::mprotect(addr, size, PROT_NONE) == 0;
2002 #else
2003 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2004 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2005 return res != (uintptr_t) MAP_FAILED;
2006 #endif
2007 }
2008
2009 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2010 return os::commit_memory(addr, size, !ExecMem);
2011 }
2012
2013 // If this is a growable mapping, remove the guard pages entirely by
2014 // munmap()ping them. If not, just call uncommit_memory().
2015 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2016 return os::uncommit_memory(addr, size);
2017 }
2018
2019 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2020 // at 'requested_addr'. If there are existing memory mappings at the same
2021 // location, however, they will be overwritten. If 'fixed' is false,
2022 // 'requested_addr' is only treated as a hint, the return value may or
2023 // may not start from the requested address. Unlike Bsd mmap(), this
2024 // function returns NULL to indicate failure.
2025 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2026 char * addr;
2027 int flags;
2028
2029 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2030 if (fixed) {
2031 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2032 flags |= MAP_FIXED;
2033 }
2034
2035 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2036 // touch an uncommitted page. Otherwise, the read/write might
2037 // succeed if we have enough swap space to back the physical page.
2038 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2039 flags, -1, 0);
2040
2041 return addr == MAP_FAILED ? NULL : addr;
2042 }
2043
2044 static int anon_munmap(char * addr, size_t size) {
2045 return ::munmap(addr, size) == 0;
2046 }
2047
2048 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2049 size_t alignment_hint) {
2050 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2051 }
2052
2053 bool os::pd_release_memory(char* addr, size_t size) {
2054 return anon_munmap(addr, size);
2055 }
2056
2057 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2058 // Bsd wants the mprotect address argument to be page aligned.
2059 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2060
2061 // According to SUSv3, mprotect() should only be used with mappings
2062 // established by mmap(), and mmap() always maps whole pages. Unaligned
2063 // 'addr' likely indicates problem in the VM (e.g. trying to change
2064 // protection of malloc'ed or statically allocated memory). Check the
2065 // caller if you hit this assert.
2066 assert(addr == bottom, "sanity check");
2067
2068 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2069 return ::mprotect(bottom, size, prot) == 0;
2070 }
2071
2072 // Set protections specified
2073 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2074 bool is_committed) {
2075 unsigned int p = 0;
2076 switch (prot) {
2077 case MEM_PROT_NONE: p = PROT_NONE; break;
2078 case MEM_PROT_READ: p = PROT_READ; break;
2079 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2080 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2081 default:
2082 ShouldNotReachHere();
2083 }
2084 // is_committed is unused.
2085 return bsd_mprotect(addr, bytes, p);
2086 }
2087
2088 bool os::guard_memory(char* addr, size_t size) {
2089 return bsd_mprotect(addr, size, PROT_NONE);
2090 }
2091
2092 bool os::unguard_memory(char* addr, size_t size) {
2093 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2094 }
2095
2096 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2097 return false;
2098 }
2099
2100 // Large page support
2101
2102 static size_t _large_page_size = 0;
2103
2104 void os::large_page_init() {
2105 }
2106
2107
2108 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2109 fatal("os::reserve_memory_special should not be called on BSD.");
2110 return NULL;
2111 }
2112
2113 bool os::release_memory_special(char* base, size_t bytes) {
2114 fatal("os::release_memory_special should not be called on BSD.");
2115 return false;
2116 }
2117
2118 size_t os::large_page_size() {
2119 return _large_page_size;
2120 }
2121
2122 bool os::can_commit_large_page_memory() {
2123 // Does not matter, we do not support huge pages.
2124 return false;
2125 }
2126
2127 bool os::can_execute_large_page_memory() {
2128 // Does not matter, we do not support huge pages.
2129 return false;
2130 }
2131
2132 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2133 assert(file_desc >= 0, "file_desc is not valid");
2134 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2135 if (result != NULL) {
2136 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2137 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2138 }
2139 }
2140 return result;
2141 }
2142
2143 // Reserve memory at an arbitrary address, only if that area is
2144 // available (and not reserved for something else).
2145
2146 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2147 const int max_tries = 10;
2148 char* base[max_tries];
2149 size_t size[max_tries];
2150 const size_t gap = 0x000000;
2151
2152 // Assert only that the size is a multiple of the page size, since
2153 // that's all that mmap requires, and since that's all we really know
2154 // about at this low abstraction level. If we need higher alignment,
2155 // we can either pass an alignment to this method or verify alignment
2156 // in one of the methods further up the call chain. See bug 5044738.
2157 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2158
2159 // Repeatedly allocate blocks until the block is allocated at the
2160 // right spot.
2161
2162 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2163 // if kernel honors the hint then we can return immediately.
2164 char * addr = anon_mmap(requested_addr, bytes, false);
2165 if (addr == requested_addr) {
2166 return requested_addr;
2167 }
2168
2169 if (addr != NULL) {
2170 // mmap() is successful but it fails to reserve at the requested address
2171 anon_munmap(addr, bytes);
2172 }
2173
2174 int i;
2175 for (i = 0; i < max_tries; ++i) {
2176 base[i] = reserve_memory(bytes);
2177
2178 if (base[i] != NULL) {
2179 // Is this the block we wanted?
2180 if (base[i] == requested_addr) {
2181 size[i] = bytes;
2182 break;
2183 }
2184
2185 // Does this overlap the block we wanted? Give back the overlapped
2186 // parts and try again.
2187
2188 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2189 if (top_overlap >= 0 && top_overlap < bytes) {
2190 unmap_memory(base[i], top_overlap);
2191 base[i] += top_overlap;
2192 size[i] = bytes - top_overlap;
2193 } else {
2194 size_t bottom_overlap = base[i] + bytes - requested_addr;
2195 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2196 unmap_memory(requested_addr, bottom_overlap);
2197 size[i] = bytes - bottom_overlap;
2198 } else {
2199 size[i] = bytes;
2200 }
2201 }
2202 }
2203 }
2204
2205 // Give back the unused reserved pieces.
2206
2207 for (int j = 0; j < i; ++j) {
2208 if (base[j] != NULL) {
2209 unmap_memory(base[j], size[j]);
2210 }
2211 }
2212
2213 if (i < max_tries) {
2214 return requested_addr;
2215 } else {
2216 return NULL;
2217 }
2218 }
2219
2220 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2221 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2222 }
2223
2224 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2225 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2226 }
2227
2228 void os::naked_short_sleep(jlong ms) {
2229 struct timespec req;
2230
2231 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2232 req.tv_sec = 0;
2233 if (ms > 0) {
2234 req.tv_nsec = (ms % 1000) * 1000000;
2235 } else {
2236 req.tv_nsec = 1;
2237 }
2238
2239 nanosleep(&req, NULL);
2240
2241 return;
2242 }
2243
2244 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2245 void os::infinite_sleep() {
2246 while (true) { // sleep forever ...
2247 ::sleep(100); // ... 100 seconds at a time
2248 }
2249 }
2250
2251 // Used to convert frequent JVM_Yield() to nops
2252 bool os::dont_yield() {
2253 return DontYieldALot;
2254 }
2255
2256 void os::naked_yield() {
2257 sched_yield();
2258 }
2259
2260 ////////////////////////////////////////////////////////////////////////////////
2261 // thread priority support
2262
2263 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2264 // only supports dynamic priority, static priority must be zero. For real-time
2265 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2266 // However, for large multi-threaded applications, SCHED_RR is not only slower
2267 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2268 // of 5 runs - Sep 2005).
2269 //
2270 // The following code actually changes the niceness of kernel-thread/LWP. It
2271 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2272 // not the entire user process, and user level threads are 1:1 mapped to kernel
2273 // threads. It has always been the case, but could change in the future. For
2274 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2275 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2276
2277 #if !defined(__APPLE__)
2278 int os::java_to_os_priority[CriticalPriority + 1] = {
2279 19, // 0 Entry should never be used
2280
2281 0, // 1 MinPriority
2282 3, // 2
2283 6, // 3
2284
2285 10, // 4
2286 15, // 5 NormPriority
2287 18, // 6
2288
2289 21, // 7
2290 25, // 8
2291 28, // 9 NearMaxPriority
2292
2293 31, // 10 MaxPriority
2294
2295 31 // 11 CriticalPriority
2296 };
2297 #else
2298 // Using Mach high-level priority assignments
2299 int os::java_to_os_priority[CriticalPriority + 1] = {
2300 0, // 0 Entry should never be used (MINPRI_USER)
2301
2302 27, // 1 MinPriority
2303 28, // 2
2304 29, // 3
2305
2306 30, // 4
2307 31, // 5 NormPriority (BASEPRI_DEFAULT)
2308 32, // 6
2309
2310 33, // 7
2311 34, // 8
2312 35, // 9 NearMaxPriority
2313
2314 36, // 10 MaxPriority
2315
2316 36 // 11 CriticalPriority
2317 };
2318 #endif
2319
2320 static int prio_init() {
2321 if (ThreadPriorityPolicy == 1) {
2322 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2323 // if effective uid is not root. Perhaps, a more elegant way of doing
2324 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2325 if (geteuid() != 0) {
2326 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2327 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2328 }
2329 ThreadPriorityPolicy = 0;
2330 }
2331 }
2332 if (UseCriticalJavaThreadPriority) {
2333 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2334 }
2335 return 0;
2336 }
2337
2338 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2339 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2340
2341 #ifdef __OpenBSD__
2342 // OpenBSD pthread_setprio starves low priority threads
2343 return OS_OK;
2344 #elif defined(__FreeBSD__)
2345 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2346 #elif defined(__APPLE__) || defined(__NetBSD__)
2347 struct sched_param sp;
2348 int policy;
2349 pthread_t self = pthread_self();
2350
2351 if (pthread_getschedparam(self, &policy, &sp) != 0) {
2352 return OS_ERR;
2353 }
2354
2355 sp.sched_priority = newpri;
2356 if (pthread_setschedparam(self, policy, &sp) != 0) {
2357 return OS_ERR;
2358 }
2359
2360 return OS_OK;
2361 #else
2362 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2363 return (ret == 0) ? OS_OK : OS_ERR;
2364 #endif
2365 }
2366
2367 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2368 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2369 *priority_ptr = java_to_os_priority[NormPriority];
2370 return OS_OK;
2371 }
2372
2373 errno = 0;
2374 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2375 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2376 #elif defined(__APPLE__) || defined(__NetBSD__)
2377 int policy;
2378 struct sched_param sp;
2379
2380 pthread_getschedparam(pthread_self(), &policy, &sp);
2381 *priority_ptr = sp.sched_priority;
2382 #else
2383 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2384 #endif
2385 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2386 }
2387
2388 ////////////////////////////////////////////////////////////////////////////////
2389 // suspend/resume support
2390
2391 // The low-level signal-based suspend/resume support is a remnant from the
2392 // old VM-suspension that used to be for java-suspension, safepoints etc,
2393 // within hotspot. Currently used by JFR's OSThreadSampler
2394 //
2395 // The remaining code is greatly simplified from the more general suspension
2396 // code that used to be used.
2397 //
2398 // The protocol is quite simple:
2399 // - suspend:
2400 // - sends a signal to the target thread
2401 // - polls the suspend state of the osthread using a yield loop
2402 // - target thread signal handler (SR_handler) sets suspend state
2403 // and blocks in sigsuspend until continued
2404 // - resume:
2405 // - sets target osthread state to continue
2406 // - sends signal to end the sigsuspend loop in the SR_handler
2407 //
2408 // Note that the SR_lock plays no role in this suspend/resume protocol,
2409 // but is checked for NULL in SR_handler as a thread termination indicator.
2410 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2411 //
2412 // Note that resume_clear_context() and suspend_save_context() are needed
2413 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2414 // which in part is used by:
2415 // - Forte Analyzer: AsyncGetCallTrace()
2416 // - StackBanging: get_frame_at_stack_banging_point()
2417
2418 static void resume_clear_context(OSThread *osthread) {
2419 osthread->set_ucontext(NULL);
2420 osthread->set_siginfo(NULL);
2421 }
2422
2423 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2424 osthread->set_ucontext(context);
2425 osthread->set_siginfo(siginfo);
2426 }
2427
2428 // Handler function invoked when a thread's execution is suspended or
2429 // resumed. We have to be careful that only async-safe functions are
2430 // called here (Note: most pthread functions are not async safe and
2431 // should be avoided.)
2432 //
2433 // Note: sigwait() is a more natural fit than sigsuspend() from an
2434 // interface point of view, but sigwait() prevents the signal hander
2435 // from being run. libpthread would get very confused by not having
2436 // its signal handlers run and prevents sigwait()'s use with the
2437 // mutex granting granting signal.
2438 //
2439 // Currently only ever called on the VMThread or JavaThread
2440 //
2441 #ifdef __APPLE__
2442 static OSXSemaphore sr_semaphore;
2443 #else
2444 static PosixSemaphore sr_semaphore;
2445 #endif
2446
2447 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2448 // Save and restore errno to avoid confusing native code with EINTR
2449 // after sigsuspend.
2450 int old_errno = errno;
2451
2452 Thread* thread = Thread::current_or_null_safe();
2453 assert(thread != NULL, "Missing current thread in SR_handler");
2454
2455 // On some systems we have seen signal delivery get "stuck" until the signal
2456 // mask is changed as part of thread termination. Check that the current thread
2457 // has not already terminated (via SR_lock()) - else the following assertion
2458 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2459 // destructor has completed.
2460
2461 if (thread->SR_lock() == NULL) {
2462 return;
2463 }
2464
2465 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2466
2467 OSThread* osthread = thread->osthread();
2468
2469 os::SuspendResume::State current = osthread->sr.state();
2470 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2471 suspend_save_context(osthread, siginfo, context);
2472
2473 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2474 os::SuspendResume::State state = osthread->sr.suspended();
2475 if (state == os::SuspendResume::SR_SUSPENDED) {
2476 sigset_t suspend_set; // signals for sigsuspend()
2477
2478 // get current set of blocked signals and unblock resume signal
2479 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2480 sigdelset(&suspend_set, SR_signum);
2481
2482 sr_semaphore.signal();
2483 // wait here until we are resumed
2484 while (1) {
2485 sigsuspend(&suspend_set);
2486
2487 os::SuspendResume::State result = osthread->sr.running();
2488 if (result == os::SuspendResume::SR_RUNNING) {
2489 sr_semaphore.signal();
2490 break;
2491 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2492 ShouldNotReachHere();
2493 }
2494 }
2495
2496 } else if (state == os::SuspendResume::SR_RUNNING) {
2497 // request was cancelled, continue
2498 } else {
2499 ShouldNotReachHere();
2500 }
2501
2502 resume_clear_context(osthread);
2503 } else if (current == os::SuspendResume::SR_RUNNING) {
2504 // request was cancelled, continue
2505 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2506 // ignore
2507 } else {
2508 // ignore
2509 }
2510
2511 errno = old_errno;
2512 }
2513
2514
2515 static int SR_initialize() {
2516 struct sigaction act;
2517 char *s;
2518 // Get signal number to use for suspend/resume
2519 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2520 int sig = ::strtol(s, 0, 10);
2521 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2522 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2523 SR_signum = sig;
2524 } else {
2525 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2526 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2527 }
2528 }
2529
2530 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2531 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2532
2533 sigemptyset(&SR_sigset);
2534 sigaddset(&SR_sigset, SR_signum);
2535
2536 // Set up signal handler for suspend/resume
2537 act.sa_flags = SA_RESTART|SA_SIGINFO;
2538 act.sa_handler = (void (*)(int)) SR_handler;
2539
2540 // SR_signum is blocked by default.
2541 // 4528190 - We also need to block pthread restart signal (32 on all
2542 // supported Bsd platforms). Note that BsdThreads need to block
2543 // this signal for all threads to work properly. So we don't have
2544 // to use hard-coded signal number when setting up the mask.
2545 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2546
2547 if (sigaction(SR_signum, &act, 0) == -1) {
2548 return -1;
2549 }
2550
2551 // Save signal flag
2552 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2553 return 0;
2554 }
2555
2556 static int sr_notify(OSThread* osthread) {
2557 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2558 assert_status(status == 0, status, "pthread_kill");
2559 return status;
2560 }
2561
2562 // "Randomly" selected value for how long we want to spin
2563 // before bailing out on suspending a thread, also how often
2564 // we send a signal to a thread we want to resume
2565 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2566 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2567
2568 // returns true on success and false on error - really an error is fatal
2569 // but this seems the normal response to library errors
2570 static bool do_suspend(OSThread* osthread) {
2571 assert(osthread->sr.is_running(), "thread should be running");
2572 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2573
2574 // mark as suspended and send signal
2575 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2576 // failed to switch, state wasn't running?
2577 ShouldNotReachHere();
2578 return false;
2579 }
2580
2581 if (sr_notify(osthread) != 0) {
2582 ShouldNotReachHere();
2583 }
2584
2585 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2586 while (true) {
2587 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2588 break;
2589 } else {
2590 // timeout
2591 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2592 if (cancelled == os::SuspendResume::SR_RUNNING) {
2593 return false;
2594 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2595 // make sure that we consume the signal on the semaphore as well
2596 sr_semaphore.wait();
2597 break;
2598 } else {
2599 ShouldNotReachHere();
2600 return false;
2601 }
2602 }
2603 }
2604
2605 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2606 return true;
2607 }
2608
2609 static void do_resume(OSThread* osthread) {
2610 assert(osthread->sr.is_suspended(), "thread should be suspended");
2611 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2612
2613 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2614 // failed to switch to WAKEUP_REQUEST
2615 ShouldNotReachHere();
2616 return;
2617 }
2618
2619 while (true) {
2620 if (sr_notify(osthread) == 0) {
2621 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2622 if (osthread->sr.is_running()) {
2623 return;
2624 }
2625 }
2626 } else {
2627 ShouldNotReachHere();
2628 }
2629 }
2630
2631 guarantee(osthread->sr.is_running(), "Must be running!");
2632 }
2633
2634 ///////////////////////////////////////////////////////////////////////////////////
2635 // signal handling (except suspend/resume)
2636
2637 // This routine may be used by user applications as a "hook" to catch signals.
2638 // The user-defined signal handler must pass unrecognized signals to this
2639 // routine, and if it returns true (non-zero), then the signal handler must
2640 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2641 // routine will never retun false (zero), but instead will execute a VM panic
2642 // routine kill the process.
2643 //
2644 // If this routine returns false, it is OK to call it again. This allows
2645 // the user-defined signal handler to perform checks either before or after
2646 // the VM performs its own checks. Naturally, the user code would be making
2647 // a serious error if it tried to handle an exception (such as a null check
2648 // or breakpoint) that the VM was generating for its own correct operation.
2649 //
2650 // This routine may recognize any of the following kinds of signals:
2651 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2652 // It should be consulted by handlers for any of those signals.
2653 //
2654 // The caller of this routine must pass in the three arguments supplied
2655 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2656 // field of the structure passed to sigaction(). This routine assumes that
2657 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2658 //
2659 // Note that the VM will print warnings if it detects conflicting signal
2660 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2661 //
2662 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2663 void* ucontext,
2664 int abort_if_unrecognized);
2665
2666 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2667 assert(info != NULL && uc != NULL, "it must be old kernel");
2668 int orig_errno = errno; // Preserve errno value over signal handler.
2669 JVM_handle_bsd_signal(sig, info, uc, true);
2670 errno = orig_errno;
2671 }
2672
2673
2674 // This boolean allows users to forward their own non-matching signals
2675 // to JVM_handle_bsd_signal, harmlessly.
2676 bool os::Bsd::signal_handlers_are_installed = false;
2677
2678 // For signal-chaining
2679 struct sigaction sigact[NSIG];
2680 uint32_t sigs = 0;
2681 #if (32 < NSIG-1)
2682 #error "Not all signals can be encoded in sigs. Adapt its type!"
2683 #endif
2684 bool os::Bsd::libjsig_is_loaded = false;
2685 typedef struct sigaction *(*get_signal_t)(int);
2686 get_signal_t os::Bsd::get_signal_action = NULL;
2687
2688 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2689 struct sigaction *actp = NULL;
2690
2691 if (libjsig_is_loaded) {
2692 // Retrieve the old signal handler from libjsig
2693 actp = (*get_signal_action)(sig);
2694 }
2695 if (actp == NULL) {
2696 // Retrieve the preinstalled signal handler from jvm
2697 actp = get_preinstalled_handler(sig);
2698 }
2699
2700 return actp;
2701 }
2702
2703 static bool call_chained_handler(struct sigaction *actp, int sig,
2704 siginfo_t *siginfo, void *context) {
2705 // Call the old signal handler
2706 if (actp->sa_handler == SIG_DFL) {
2707 // It's more reasonable to let jvm treat it as an unexpected exception
2708 // instead of taking the default action.
2709 return false;
2710 } else if (actp->sa_handler != SIG_IGN) {
2711 if ((actp->sa_flags & SA_NODEFER) == 0) {
2712 // automaticlly block the signal
2713 sigaddset(&(actp->sa_mask), sig);
2714 }
2715
2716 sa_handler_t hand;
2717 sa_sigaction_t sa;
2718 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2719 // retrieve the chained handler
2720 if (siginfo_flag_set) {
2721 sa = actp->sa_sigaction;
2722 } else {
2723 hand = actp->sa_handler;
2724 }
2725
2726 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2727 actp->sa_handler = SIG_DFL;
2728 }
2729
2730 // try to honor the signal mask
2731 sigset_t oset;
2732 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2733
2734 // call into the chained handler
2735 if (siginfo_flag_set) {
2736 (*sa)(sig, siginfo, context);
2737 } else {
2738 (*hand)(sig);
2739 }
2740
2741 // restore the signal mask
2742 pthread_sigmask(SIG_SETMASK, &oset, 0);
2743 }
2744 // Tell jvm's signal handler the signal is taken care of.
2745 return true;
2746 }
2747
2748 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2749 bool chained = false;
2750 // signal-chaining
2751 if (UseSignalChaining) {
2752 struct sigaction *actp = get_chained_signal_action(sig);
2753 if (actp != NULL) {
2754 chained = call_chained_handler(actp, sig, siginfo, context);
2755 }
2756 }
2757 return chained;
2758 }
2759
2760 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
2761 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
2762 return &sigact[sig];
2763 }
2764 return NULL;
2765 }
2766
2767 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
2768 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2769 sigact[sig] = oldAct;
2770 sigs |= (uint32_t)1 << (sig-1);
2771 }
2772
2773 // for diagnostic
2774 int sigflags[NSIG];
2775
2776 int os::Bsd::get_our_sigflags(int sig) {
2777 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2778 return sigflags[sig];
2779 }
2780
2781 void os::Bsd::set_our_sigflags(int sig, int flags) {
2782 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2783 if (sig > 0 && sig < NSIG) {
2784 sigflags[sig] = flags;
2785 }
2786 }
2787
2788 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2789 // Check for overwrite.
2790 struct sigaction oldAct;
2791 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2792
2793 void* oldhand = oldAct.sa_sigaction
2794 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2795 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2796 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2797 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2798 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2799 if (AllowUserSignalHandlers || !set_installed) {
2800 // Do not overwrite; user takes responsibility to forward to us.
2801 return;
2802 } else if (UseSignalChaining) {
2803 // save the old handler in jvm
2804 save_preinstalled_handler(sig, oldAct);
2805 // libjsig also interposes the sigaction() call below and saves the
2806 // old sigaction on it own.
2807 } else {
2808 fatal("Encountered unexpected pre-existing sigaction handler "
2809 "%#lx for signal %d.", (long)oldhand, sig);
2810 }
2811 }
2812
2813 struct sigaction sigAct;
2814 sigfillset(&(sigAct.sa_mask));
2815 sigAct.sa_handler = SIG_DFL;
2816 if (!set_installed) {
2817 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2818 } else {
2819 sigAct.sa_sigaction = signalHandler;
2820 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2821 }
2822 #ifdef __APPLE__
2823 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2824 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2825 // if the signal handler declares it will handle it on alternate stack.
2826 // Notice we only declare we will handle it on alt stack, but we are not
2827 // actually going to use real alt stack - this is just a workaround.
2828 // Please see ux_exception.c, method catch_mach_exception_raise for details
2829 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2830 if (sig == SIGSEGV) {
2831 sigAct.sa_flags |= SA_ONSTACK;
2832 }
2833 #endif
2834
2835 // Save flags, which are set by ours
2836 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2837 sigflags[sig] = sigAct.sa_flags;
2838
2839 int ret = sigaction(sig, &sigAct, &oldAct);
2840 assert(ret == 0, "check");
2841
2842 void* oldhand2 = oldAct.sa_sigaction
2843 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2844 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2845 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2846 }
2847
2848 // install signal handlers for signals that HotSpot needs to
2849 // handle in order to support Java-level exception handling.
2850
2851 void os::Bsd::install_signal_handlers() {
2852 if (!signal_handlers_are_installed) {
2853 signal_handlers_are_installed = true;
2854
2855 // signal-chaining
2856 typedef void (*signal_setting_t)();
2857 signal_setting_t begin_signal_setting = NULL;
2858 signal_setting_t end_signal_setting = NULL;
2859 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2860 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2861 if (begin_signal_setting != NULL) {
2862 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2863 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2864 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2865 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2866 libjsig_is_loaded = true;
2867 assert(UseSignalChaining, "should enable signal-chaining");
2868 }
2869 if (libjsig_is_loaded) {
2870 // Tell libjsig jvm is setting signal handlers
2871 (*begin_signal_setting)();
2872 }
2873
2874 set_signal_handler(SIGSEGV, true);
2875 set_signal_handler(SIGPIPE, true);
2876 set_signal_handler(SIGBUS, true);
2877 set_signal_handler(SIGILL, true);
2878 set_signal_handler(SIGFPE, true);
2879 set_signal_handler(SIGXFSZ, true);
2880
2881 #if defined(__APPLE__)
2882 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2883 // signals caught and handled by the JVM. To work around this, we reset the mach task
2884 // signal handler that's placed on our process by CrashReporter. This disables
2885 // CrashReporter-based reporting.
2886 //
2887 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2888 // on caught fatal signals.
2889 //
2890 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2891 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2892 // exception handling, while leaving the standard BSD signal handlers functional.
2893 kern_return_t kr;
2894 kr = task_set_exception_ports(mach_task_self(),
2895 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2896 MACH_PORT_NULL,
2897 EXCEPTION_STATE_IDENTITY,
2898 MACHINE_THREAD_STATE);
2899
2900 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2901 #endif
2902
2903 if (libjsig_is_loaded) {
2904 // Tell libjsig jvm finishes setting signal handlers
2905 (*end_signal_setting)();
2906 }
2907
2908 // We don't activate signal checker if libjsig is in place, we trust ourselves
2909 // and if UserSignalHandler is installed all bets are off
2910 if (CheckJNICalls) {
2911 if (libjsig_is_loaded) {
2912 if (PrintJNIResolving) {
2913 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
2914 }
2915 check_signals = false;
2916 }
2917 if (AllowUserSignalHandlers) {
2918 if (PrintJNIResolving) {
2919 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2920 }
2921 check_signals = false;
2922 }
2923 }
2924 }
2925 }
2926
2927
2928 /////
2929 // glibc on Bsd platform uses non-documented flag
2930 // to indicate, that some special sort of signal
2931 // trampoline is used.
2932 // We will never set this flag, and we should
2933 // ignore this flag in our diagnostic
2934 #ifdef SIGNIFICANT_SIGNAL_MASK
2935 #undef SIGNIFICANT_SIGNAL_MASK
2936 #endif
2937 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2938
2939 static const char* get_signal_handler_name(address handler,
2940 char* buf, int buflen) {
2941 int offset;
2942 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2943 if (found) {
2944 // skip directory names
2945 const char *p1, *p2;
2946 p1 = buf;
2947 size_t len = strlen(os::file_separator());
2948 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2949 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2950 } else {
2951 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2952 }
2953 return buf;
2954 }
2955
2956 static void print_signal_handler(outputStream* st, int sig,
2957 char* buf, size_t buflen) {
2958 struct sigaction sa;
2959
2960 sigaction(sig, NULL, &sa);
2961
2962 // See comment for SIGNIFICANT_SIGNAL_MASK define
2963 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2964
2965 st->print("%s: ", os::exception_name(sig, buf, buflen));
2966
2967 address handler = (sa.sa_flags & SA_SIGINFO)
2968 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2969 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2970
2971 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2972 st->print("SIG_DFL");
2973 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2974 st->print("SIG_IGN");
2975 } else {
2976 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2977 }
2978
2979 st->print(", sa_mask[0]=");
2980 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2981
2982 address rh = VMError::get_resetted_sighandler(sig);
2983 // May be, handler was resetted by VMError?
2984 if (rh != NULL) {
2985 handler = rh;
2986 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2987 }
2988
2989 st->print(", sa_flags=");
2990 os::Posix::print_sa_flags(st, sa.sa_flags);
2991
2992 // Check: is it our handler?
2993 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2994 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2995 // It is our signal handler
2996 // check for flags, reset system-used one!
2997 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2998 st->print(
2999 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3000 os::Bsd::get_our_sigflags(sig));
3001 }
3002 }
3003 st->cr();
3004 }
3005
3006
3007 #define DO_SIGNAL_CHECK(sig) \
3008 do { \
3009 if (!sigismember(&check_signal_done, sig)) { \
3010 os::Bsd::check_signal_handler(sig); \
3011 } \
3012 } while (0)
3013
3014 // This method is a periodic task to check for misbehaving JNI applications
3015 // under CheckJNI, we can add any periodic checks here
3016
3017 void os::run_periodic_checks() {
3018
3019 if (check_signals == false) return;
3020
3021 // SEGV and BUS if overridden could potentially prevent
3022 // generation of hs*.log in the event of a crash, debugging
3023 // such a case can be very challenging, so we absolutely
3024 // check the following for a good measure:
3025 DO_SIGNAL_CHECK(SIGSEGV);
3026 DO_SIGNAL_CHECK(SIGILL);
3027 DO_SIGNAL_CHECK(SIGFPE);
3028 DO_SIGNAL_CHECK(SIGBUS);
3029 DO_SIGNAL_CHECK(SIGPIPE);
3030 DO_SIGNAL_CHECK(SIGXFSZ);
3031
3032
3033 // ReduceSignalUsage allows the user to override these handlers
3034 // see comments at the very top and jvm_md.h
3035 if (!ReduceSignalUsage) {
3036 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3037 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3038 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3039 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3040 }
3041
3042 DO_SIGNAL_CHECK(SR_signum);
3043 }
3044
3045 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3046
3047 static os_sigaction_t os_sigaction = NULL;
3048
3049 void os::Bsd::check_signal_handler(int sig) {
3050 char buf[O_BUFLEN];
3051 address jvmHandler = NULL;
3052
3053
3054 struct sigaction act;
3055 if (os_sigaction == NULL) {
3056 // only trust the default sigaction, in case it has been interposed
3057 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3058 if (os_sigaction == NULL) return;
3059 }
3060
3061 os_sigaction(sig, (struct sigaction*)NULL, &act);
3062
3063
3064 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3065
3066 address thisHandler = (act.sa_flags & SA_SIGINFO)
3067 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3068 : CAST_FROM_FN_PTR(address, act.sa_handler);
3069
3070
3071 switch (sig) {
3072 case SIGSEGV:
3073 case SIGBUS:
3074 case SIGFPE:
3075 case SIGPIPE:
3076 case SIGILL:
3077 case SIGXFSZ:
3078 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3079 break;
3080
3081 case SHUTDOWN1_SIGNAL:
3082 case SHUTDOWN2_SIGNAL:
3083 case SHUTDOWN3_SIGNAL:
3084 case BREAK_SIGNAL:
3085 jvmHandler = (address)user_handler();
3086 break;
3087
3088 default:
3089 if (sig == SR_signum) {
3090 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3091 } else {
3092 return;
3093 }
3094 break;
3095 }
3096
3097 if (thisHandler != jvmHandler) {
3098 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3099 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3100 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3101 // No need to check this sig any longer
3102 sigaddset(&check_signal_done, sig);
3103 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3104 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3105 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3106 exception_name(sig, buf, O_BUFLEN));
3107 }
3108 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3109 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3110 tty->print("expected:");
3111 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3112 tty->cr();
3113 tty->print(" found:");
3114 os::Posix::print_sa_flags(tty, act.sa_flags);
3115 tty->cr();
3116 // No need to check this sig any longer
3117 sigaddset(&check_signal_done, sig);
3118 }
3119
3120 // Dump all the signal
3121 if (sigismember(&check_signal_done, sig)) {
3122 print_signal_handlers(tty, buf, O_BUFLEN);
3123 }
3124 }
3125
3126 extern void report_error(char* file_name, int line_no, char* title,
3127 char* format, ...);
3128
3129 // this is called _before_ the most of global arguments have been parsed
3130 void os::init(void) {
3131 char dummy; // used to get a guess on initial stack address
3132
3133 // With BsdThreads the JavaMain thread pid (primordial thread)
3134 // is different than the pid of the java launcher thread.
3135 // So, on Bsd, the launcher thread pid is passed to the VM
3136 // via the sun.java.launcher.pid property.
3137 // Use this property instead of getpid() if it was correctly passed.
3138 // See bug 6351349.
3139 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3140
3141 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3142
3143 clock_tics_per_sec = CLK_TCK;
3144
3145 init_random(1234567);
3146
3147 Bsd::set_page_size(getpagesize());
3148 if (Bsd::page_size() == -1) {
3149 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3150 }
3151 init_page_sizes((size_t) Bsd::page_size());
3152
3153 Bsd::initialize_system_info();
3154
3155 // _main_thread points to the thread that created/loaded the JVM.
3156 Bsd::_main_thread = pthread_self();
3157
3158 Bsd::clock_init();
3159 initial_time_count = javaTimeNanos();
3160
3161 os::Posix::init();
3162 }
3163
3164 // To install functions for atexit system call
3165 extern "C" {
3166 static void perfMemory_exit_helper() {
3167 perfMemory_exit();
3168 }
3169 }
3170
3171 // this is called _after_ the global arguments have been parsed
3172 jint os::init_2(void) {
3173
3174 // This could be set after os::Posix::init() but all platforms
3175 // have to set it the same so we have to mirror Solaris.
3176 DEBUG_ONLY(os::set_mutex_init_done();)
3177
3178 os::Posix::init_2();
3179
3180 // initialize suspend/resume support - must do this before signal_sets_init()
3181 if (SR_initialize() != 0) {
3182 perror("SR_initialize failed");
3183 return JNI_ERR;
3184 }
3185
3186 Bsd::signal_sets_init();
3187 Bsd::install_signal_handlers();
3188 // Initialize data for jdk.internal.misc.Signal
3189 if (!ReduceSignalUsage) {
3190 jdk_misc_signal_init();
3191 }
3192
3193 // Check and sets minimum stack sizes against command line options
3194 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3195 return JNI_ERR;
3196 }
3197
3198 if (MaxFDLimit) {
3199 // set the number of file descriptors to max. print out error
3200 // if getrlimit/setrlimit fails but continue regardless.
3201 struct rlimit nbr_files;
3202 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3203 if (status != 0) {
3204 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3205 } else {
3206 nbr_files.rlim_cur = nbr_files.rlim_max;
3207
3208 #ifdef __APPLE__
3209 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3210 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3211 // be used instead
3212 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3213 #endif
3214
3215 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3216 if (status != 0) {
3217 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3218 }
3219 }
3220 }
3221
3222 // at-exit methods are called in the reverse order of their registration.
3223 // atexit functions are called on return from main or as a result of a
3224 // call to exit(3C). There can be only 32 of these functions registered
3225 // and atexit() does not set errno.
3226
3227 if (PerfAllowAtExitRegistration) {
3228 // only register atexit functions if PerfAllowAtExitRegistration is set.
3229 // atexit functions can be delayed until process exit time, which
3230 // can be problematic for embedded VM situations. Embedded VMs should
3231 // call DestroyJavaVM() to assure that VM resources are released.
3232
3233 // note: perfMemory_exit_helper atexit function may be removed in
3234 // the future if the appropriate cleanup code can be added to the
3235 // VM_Exit VMOperation's doit method.
3236 if (atexit(perfMemory_exit_helper) != 0) {
3237 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3238 }
3239 }
3240
3241 // initialize thread priority policy
3242 prio_init();
3243
3244 #ifdef __APPLE__
3245 // dynamically link to objective c gc registration
3246 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3247 if (handleLibObjc != NULL) {
3248 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3249 }
3250 #endif
3251
3252 return JNI_OK;
3253 }
3254
3255 // Mark the polling page as unreadable
3256 void os::make_polling_page_unreadable(void) {
3257 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3258 fatal("Could not disable polling page");
3259 }
3260 }
3261
3262 // Mark the polling page as readable
3263 void os::make_polling_page_readable(void) {
3264 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3265 fatal("Could not enable polling page");
3266 }
3267 }
3268
3269 int os::active_processor_count() {
3270 // User has overridden the number of active processors
3271 if (ActiveProcessorCount > 0) {
3272 log_trace(os)("active_processor_count: "
3273 "active processor count set by user : %d",
3274 ActiveProcessorCount);
3275 return ActiveProcessorCount;
3276 }
3277
3278 return _processor_count;
3279 }
3280
3281 void os::set_native_thread_name(const char *name) {
3282 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3283 // This is only supported in Snow Leopard and beyond
3284 if (name != NULL) {
3285 // Add a "Java: " prefix to the name
3286 char buf[MAXTHREADNAMESIZE];
3287 snprintf(buf, sizeof(buf), "Java: %s", name);
3288 pthread_setname_np(buf);
3289 }
3290 #endif
3291 }
3292
3293 bool os::distribute_processes(uint length, uint* distribution) {
3294 // Not yet implemented.
3295 return false;
3296 }
3297
3298 bool os::bind_to_processor(uint processor_id) {
3299 // Not yet implemented.
3300 return false;
3301 }
3302
3303 void os::SuspendedThreadTask::internal_do_task() {
3304 if (do_suspend(_thread->osthread())) {
3305 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3306 do_task(context);
3307 do_resume(_thread->osthread());
3308 }
3309 }
3310
3311 ////////////////////////////////////////////////////////////////////////////////
3312 // debug support
3313
3314 bool os::find(address addr, outputStream* st) {
3315 Dl_info dlinfo;
3316 memset(&dlinfo, 0, sizeof(dlinfo));
3317 if (dladdr(addr, &dlinfo) != 0) {
3318 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3319 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3320 st->print("%s+%#x", dlinfo.dli_sname,
3321 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3322 } else if (dlinfo.dli_fbase != NULL) {
3323 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3324 } else {
3325 st->print("<absolute address>");
3326 }
3327 if (dlinfo.dli_fname != NULL) {
3328 st->print(" in %s", dlinfo.dli_fname);
3329 }
3330 if (dlinfo.dli_fbase != NULL) {
3331 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3332 }
3333 st->cr();
3334
3335 if (Verbose) {
3336 // decode some bytes around the PC
3337 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3338 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3339 address lowest = (address) dlinfo.dli_sname;
3340 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3341 if (begin < lowest) begin = lowest;
3342 Dl_info dlinfo2;
3343 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3344 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3345 end = (address) dlinfo2.dli_saddr;
3346 }
3347 Disassembler::decode(begin, end, st);
3348 }
3349 return true;
3350 }
3351 return false;
3352 }
3353
3354 ////////////////////////////////////////////////////////////////////////////////
3355 // misc
3356
3357 // This does not do anything on Bsd. This is basically a hook for being
3358 // able to use structured exception handling (thread-local exception filters)
3359 // on, e.g., Win32.
3360 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3361 const methodHandle& method, JavaCallArguments* args,
3362 Thread* thread) {
3363 f(value, method, args, thread);
3364 }
3365
3366 void os::print_statistics() {
3367 }
3368
3369 bool os::message_box(const char* title, const char* message) {
3370 int i;
3371 fdStream err(defaultStream::error_fd());
3372 for (i = 0; i < 78; i++) err.print_raw("=");
3373 err.cr();
3374 err.print_raw_cr(title);
3375 for (i = 0; i < 78; i++) err.print_raw("-");
3376 err.cr();
3377 err.print_raw_cr(message);
3378 for (i = 0; i < 78; i++) err.print_raw("=");
3379 err.cr();
3380
3381 char buf[16];
3382 // Prevent process from exiting upon "read error" without consuming all CPU
3383 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3384
3385 return buf[0] == 'y' || buf[0] == 'Y';
3386 }
3387
3388 static inline struct timespec get_mtime(const char* filename) {
3389 struct stat st;
3390 int ret = os::stat(filename, &st);
3391 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3392 #ifdef __APPLE__
3393 return st.st_mtimespec;
3394 #else
3395 return st.st_mtim;
3396 #endif
3397 }
3398
3399 int os::compare_file_modified_times(const char* file1, const char* file2) {
3400 struct timespec filetime1 = get_mtime(file1);
3401 struct timespec filetime2 = get_mtime(file2);
3402 int diff = filetime1.tv_sec - filetime2.tv_sec;
3403 if (diff == 0) {
3404 return filetime1.tv_nsec - filetime2.tv_nsec;
3405 }
3406 return diff;
3407 }
3408
3409 // Is a (classpath) directory empty?
3410 bool os::dir_is_empty(const char* path) {
3411 DIR *dir = NULL;
3412 struct dirent *ptr;
3413
3414 dir = opendir(path);
3415 if (dir == NULL) return true;
3416
3417 // Scan the directory
3418 bool result = true;
3419 while (result && (ptr = readdir(dir)) != NULL) {
3420 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3421 result = false;
3422 }
3423 }
3424 closedir(dir);
3425 return result;
3426 }
3427
3428 // This code originates from JDK's sysOpen and open64_w
3429 // from src/solaris/hpi/src/system_md.c
3430
3431 int os::open(const char *path, int oflag, int mode) {
3432 if (strlen(path) > MAX_PATH - 1) {
3433 errno = ENAMETOOLONG;
3434 return -1;
3435 }
3436 int fd;
3437
3438 fd = ::open(path, oflag, mode);
3439 if (fd == -1) return -1;
3440
3441 // If the open succeeded, the file might still be a directory
3442 {
3443 struct stat buf;
3444 int ret = ::fstat(fd, &buf);
3445 int st_mode = buf.st_mode;
3446
3447 if (ret != -1) {
3448 if ((st_mode & S_IFMT) == S_IFDIR) {
3449 errno = EISDIR;
3450 ::close(fd);
3451 return -1;
3452 }
3453 } else {
3454 ::close(fd);
3455 return -1;
3456 }
3457 }
3458
3459 // All file descriptors that are opened in the JVM and not
3460 // specifically destined for a subprocess should have the
3461 // close-on-exec flag set. If we don't set it, then careless 3rd
3462 // party native code might fork and exec without closing all
3463 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3464 // UNIXProcess.c), and this in turn might:
3465 //
3466 // - cause end-of-file to fail to be detected on some file
3467 // descriptors, resulting in mysterious hangs, or
3468 //
3469 // - might cause an fopen in the subprocess to fail on a system
3470 // suffering from bug 1085341.
3471 //
3472 // (Yes, the default setting of the close-on-exec flag is a Unix
3473 // design flaw)
3474 //
3475 // See:
3476 // 1085341: 32-bit stdio routines should support file descriptors >255
3477 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3478 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3479 //
3480 #ifdef FD_CLOEXEC
3481 {
3482 int flags = ::fcntl(fd, F_GETFD);
3483 if (flags != -1) {
3484 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3485 }
3486 }
3487 #endif
3488
3489 return fd;
3490 }
3491
3492
3493 // create binary file, rewriting existing file if required
3494 int os::create_binary_file(const char* path, bool rewrite_existing) {
3495 int oflags = O_WRONLY | O_CREAT;
3496 if (!rewrite_existing) {
3497 oflags |= O_EXCL;
3498 }
3499 return ::open(path, oflags, S_IREAD | S_IWRITE);
3500 }
3501
3502 // return current position of file pointer
3503 jlong os::current_file_offset(int fd) {
3504 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3505 }
3506
3507 // move file pointer to the specified offset
3508 jlong os::seek_to_file_offset(int fd, jlong offset) {
3509 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3510 }
3511
3512 // This code originates from JDK's sysAvailable
3513 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3514
3515 int os::available(int fd, jlong *bytes) {
3516 jlong cur, end;
3517 int mode;
3518 struct stat buf;
3519
3520 if (::fstat(fd, &buf) >= 0) {
3521 mode = buf.st_mode;
3522 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3523 int n;
3524 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3525 *bytes = n;
3526 return 1;
3527 }
3528 }
3529 }
3530 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3531 return 0;
3532 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3533 return 0;
3534 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3535 return 0;
3536 }
3537 *bytes = end - cur;
3538 return 1;
3539 }
3540
3541 // Map a block of memory.
3542 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3543 char *addr, size_t bytes, bool read_only,
3544 bool allow_exec) {
3545 int prot;
3546 int flags;
3547
3548 if (read_only) {
3549 prot = PROT_READ;
3550 flags = MAP_SHARED;
3551 } else {
3552 prot = PROT_READ | PROT_WRITE;
3553 flags = MAP_PRIVATE;
3554 }
3555
3556 if (allow_exec) {
3557 prot |= PROT_EXEC;
3558 }
3559
3560 if (addr != NULL) {
3561 flags |= MAP_FIXED;
3562 }
3563
3564 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3565 fd, file_offset);
3566 if (mapped_address == MAP_FAILED) {
3567 return NULL;
3568 }
3569 return mapped_address;
3570 }
3571
3572
3573 // Remap a block of memory.
3574 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3575 char *addr, size_t bytes, bool read_only,
3576 bool allow_exec) {
3577 // same as map_memory() on this OS
3578 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3579 allow_exec);
3580 }
3581
3582
3583 // Unmap a block of memory.
3584 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3585 return munmap(addr, bytes) == 0;
3586 }
3587
3588 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3589 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3590 // of a thread.
3591 //
3592 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3593 // the fast estimate available on the platform.
3594
3595 jlong os::current_thread_cpu_time() {
3596 #ifdef __APPLE__
3597 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3598 #else
3599 Unimplemented();
3600 return 0;
3601 #endif
3602 }
3603
3604 jlong os::thread_cpu_time(Thread* thread) {
3605 #ifdef __APPLE__
3606 return os::thread_cpu_time(thread, true /* user + sys */);
3607 #else
3608 Unimplemented();
3609 return 0;
3610 #endif
3611 }
3612
3613 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3614 #ifdef __APPLE__
3615 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3616 #else
3617 Unimplemented();
3618 return 0;
3619 #endif
3620 }
3621
3622 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3623 #ifdef __APPLE__
3624 struct thread_basic_info tinfo;
3625 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3626 kern_return_t kr;
3627 thread_t mach_thread;
3628
3629 mach_thread = thread->osthread()->thread_id();
3630 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3631 if (kr != KERN_SUCCESS) {
3632 return -1;
3633 }
3634
3635 if (user_sys_cpu_time) {
3636 jlong nanos;
3637 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3638 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3639 return nanos;
3640 } else {
3641 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3642 }
3643 #else
3644 Unimplemented();
3645 return 0;
3646 #endif
3647 }
3648
3649
3650 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3651 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3652 info_ptr->may_skip_backward = false; // elapsed time not wall time
3653 info_ptr->may_skip_forward = false; // elapsed time not wall time
3654 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3655 }
3656
3657 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3658 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3659 info_ptr->may_skip_backward = false; // elapsed time not wall time
3660 info_ptr->may_skip_forward = false; // elapsed time not wall time
3661 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3662 }
3663
3664 bool os::is_thread_cpu_time_supported() {
3665 #ifdef __APPLE__
3666 return true;
3667 #else
3668 return false;
3669 #endif
3670 }
3671
3672 // System loadavg support. Returns -1 if load average cannot be obtained.
3673 // Bsd doesn't yet have a (official) notion of processor sets,
3674 // so just return the system wide load average.
3675 int os::loadavg(double loadavg[], int nelem) {
3676 return ::getloadavg(loadavg, nelem);
3677 }
3678
3679 void os::pause() {
3680 char filename[MAX_PATH];
3681 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3682 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3683 } else {
3684 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3685 }
3686
3687 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3688 if (fd != -1) {
3689 struct stat buf;
3690 ::close(fd);
3691 while (::stat(filename, &buf) == 0) {
3692 (void)::poll(NULL, 0, 100);
3693 }
3694 } else {
3695 jio_fprintf(stderr,
3696 "Could not open pause file '%s', continuing immediately.\n", filename);
3697 }
3698 }
3699
3700 // Darwin has no "environ" in a dynamic library.
3701 #ifdef __APPLE__
3702 #include <crt_externs.h>
3703 #define environ (*_NSGetEnviron())
3704 #else
3705 extern char** environ;
3706 #endif
3707
3708 // Run the specified command in a separate process. Return its exit value,
3709 // or -1 on failure (e.g. can't fork a new process).
3710 // Unlike system(), this function can be called from signal handler. It
3711 // doesn't block SIGINT et al.
3712 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3713 const char * argv[4] = {"sh", "-c", cmd, NULL};
3714
3715 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3716 // pthread_atfork handlers and reset pthread library. All we need is a
3717 // separate process to execve. Make a direct syscall to fork process.
3718 // On IA64 there's no fork syscall, we have to use fork() and hope for
3719 // the best...
3720 pid_t pid = fork();
3721
3722 if (pid < 0) {
3723 // fork failed
3724 return -1;
3725
3726 } else if (pid == 0) {
3727 // child process
3728
3729 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3730 // first to kill every thread on the thread list. Because this list is
3731 // not reset by fork() (see notes above), execve() will instead kill
3732 // every thread in the parent process. We know this is the only thread
3733 // in the new process, so make a system call directly.
3734 // IA64 should use normal execve() from glibc to match the glibc fork()
3735 // above.
3736 execve("/bin/sh", (char* const*)argv, environ);
3737
3738 // execve failed
3739 _exit(-1);
3740
3741 } else {
3742 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3743 // care about the actual exit code, for now.
3744
3745 int status;
3746
3747 // Wait for the child process to exit. This returns immediately if
3748 // the child has already exited. */
3749 while (waitpid(pid, &status, 0) < 0) {
3750 switch (errno) {
3751 case ECHILD: return 0;
3752 case EINTR: break;
3753 default: return -1;
3754 }
3755 }
3756
3757 if (WIFEXITED(status)) {
3758 // The child exited normally; get its exit code.
3759 return WEXITSTATUS(status);
3760 } else if (WIFSIGNALED(status)) {
3761 // The child exited because of a signal
3762 // The best value to return is 0x80 + signal number,
3763 // because that is what all Unix shells do, and because
3764 // it allows callers to distinguish between process exit and
3765 // process death by signal.
3766 return 0x80 + WTERMSIG(status);
3767 } else {
3768 // Unknown exit code; pass it through
3769 return status;
3770 }
3771 }
3772 }
3773
3774 // Get the default path to the core file
3775 // Returns the length of the string
3776 int os::get_core_path(char* buffer, size_t bufferSize) {
3777 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
3778
3779 // Truncate if theoretical string was longer than bufferSize
3780 n = MIN2(n, (int)bufferSize);
3781
3782 return n;
3783 }
3784
3785 #ifndef PRODUCT
3786 void TestReserveMemorySpecial_test() {
3787 // No tests available for this platform
3788 }
3789 #endif
3790
3791 bool os::start_debugging(char *buf, int buflen) {
3792 int len = (int)strlen(buf);
3793 char *p = &buf[len];
3794
3795 jio_snprintf(p, buflen-len,
3796 "\n\n"
3797 "Do you want to debug the problem?\n\n"
3798 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3799 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3800 "Otherwise, press RETURN to abort...",
3801 os::current_process_id(), os::current_process_id(),
3802 os::current_thread_id(), os::current_thread_id());
3803
3804 bool yes = os::message_box("Unexpected Error", buf);
3805
3806 if (yes) {
3807 // yes, user asked VM to launch debugger
3808 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3809 os::current_process_id(), os::current_process_id());
3810
3811 os::fork_and_exec(buf);
3812 yes = false;
3813 }
3814 return yes;
3815 }