1 /*
2 * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_bsd.inline.hpp"
41 #include "os_posix.inline.hpp"
42 #include "os_share_bsd.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.inline.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/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 // Signal number used to suspend/resume a thread
138
139 // do not use any signal number less than SIGSEGV, see 4355769
140 static int SR_signum = SIGUSR2;
141 sigset_t SR_sigset;
142
143 #ifdef __APPLE__
144 static const int processor_id_unassigned = -1;
145 static const int processor_id_assigning = -2;
146 static const int processor_id_map_size = 256;
147 static volatile int processor_id_map[processor_id_map_size];
148 static volatile int processor_id_next = 0;
149 #endif
150
151 ////////////////////////////////////////////////////////////////////////////////
152 // utility functions
153
154 static int SR_initialize();
155
156 julong os::available_memory() {
157 return Bsd::available_memory();
158 }
159
160 // available here means free
161 julong os::Bsd::available_memory() {
162 uint64_t available = physical_memory() >> 2;
163 #ifdef __APPLE__
164 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
165 vm_statistics64_data_t vmstat;
166 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
167 (host_info64_t)&vmstat, &count);
168 assert(kerr == KERN_SUCCESS,
169 "host_statistics64 failed - check mach_host_self() and count");
170 if (kerr == KERN_SUCCESS) {
171 available = vmstat.free_count * os::vm_page_size();
172 }
173 #endif
174 return available;
175 }
176
177 // for more info see :
178 // https://man.openbsd.org/sysctl.2
179 void os::Bsd::print_uptime_info(outputStream* st) {
180 struct timeval boottime;
181 size_t len = sizeof(boottime);
182 int mib[2];
183 mib[0] = CTL_KERN;
184 mib[1] = KERN_BOOTTIME;
185
186 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
187 time_t bootsec = boottime.tv_sec;
188 time_t currsec = time(NULL);
189 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
190 }
191 }
192
193 julong os::physical_memory() {
194 return Bsd::physical_memory();
195 }
196
197 // Return true if user is running as root.
198
199 bool os::have_special_privileges() {
200 static bool init = false;
201 static bool privileges = false;
202 if (!init) {
203 privileges = (getuid() != geteuid()) || (getgid() != getegid());
204 init = true;
205 }
206 return privileges;
207 }
208
209
210
211 // Cpu architecture string
212 #if defined(ZERO)
213 static char cpu_arch[] = ZERO_LIBARCH;
214 #elif defined(IA64)
215 static char cpu_arch[] = "ia64";
216 #elif defined(IA32)
217 static char cpu_arch[] = "i386";
218 #elif defined(AMD64)
219 static char cpu_arch[] = "amd64";
220 #elif defined(ARM)
221 static char cpu_arch[] = "arm";
222 #elif defined(PPC32)
223 static char cpu_arch[] = "ppc";
224 #else
225 #error Add appropriate cpu_arch setting
226 #endif
227
228 // Compiler variant
229 #ifdef COMPILER2
230 #define COMPILER_VARIANT "server"
231 #else
232 #define COMPILER_VARIANT "client"
233 #endif
234
235
236 void os::Bsd::initialize_system_info() {
237 int mib[2];
238 size_t len;
239 int cpu_val;
240 julong mem_val;
241
242 // get processors count via hw.ncpus sysctl
243 mib[0] = CTL_HW;
244 mib[1] = HW_NCPU;
245 len = sizeof(cpu_val);
246 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
247 assert(len == sizeof(cpu_val), "unexpected data size");
248 set_processor_count(cpu_val);
249 } else {
250 set_processor_count(1); // fallback
251 }
252
253 #ifdef __APPLE__
254 // initialize processor id map
255 for (int i = 0; i < processor_id_map_size; i++) {
256 processor_id_map[i] = processor_id_unassigned;
257 }
258 #endif
259
260 // get physical memory via hw.memsize sysctl (hw.memsize is used
261 // since it returns a 64 bit value)
262 mib[0] = CTL_HW;
263
264 #if defined (HW_MEMSIZE) // Apple
265 mib[1] = HW_MEMSIZE;
266 #elif defined(HW_PHYSMEM) // Most of BSD
267 mib[1] = HW_PHYSMEM;
268 #elif defined(HW_REALMEM) // Old FreeBSD
269 mib[1] = HW_REALMEM;
270 #else
271 #error No ways to get physmem
272 #endif
273
274 len = sizeof(mem_val);
275 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
276 assert(len == sizeof(mem_val), "unexpected data size");
277 _physical_memory = mem_val;
278 } else {
279 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
280 }
281
282 #ifdef __OpenBSD__
283 {
284 // limit _physical_memory memory view on OpenBSD since
285 // datasize rlimit restricts us anyway.
286 struct rlimit limits;
287 getrlimit(RLIMIT_DATA, &limits);
288 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
289 }
290 #endif
291 }
292
293 #ifdef __APPLE__
294 static const char *get_home() {
295 const char *home_dir = ::getenv("HOME");
296 if ((home_dir == NULL) || (*home_dir == '\0')) {
297 struct passwd *passwd_info = getpwuid(geteuid());
298 if (passwd_info != NULL) {
299 home_dir = passwd_info->pw_dir;
300 }
301 }
302
303 return home_dir;
304 }
305 #endif
306
307 void os::init_system_properties_values() {
308 // The next steps are taken in the product version:
309 //
310 // Obtain the JAVA_HOME value from the location of libjvm.so.
311 // This library should be located at:
312 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
313 //
314 // If "/jre/lib/" appears at the right place in the path, then we
315 // assume libjvm.so is installed in a JDK and we use this path.
316 //
317 // Otherwise exit with message: "Could not create the Java virtual machine."
318 //
319 // The following extra steps are taken in the debugging version:
320 //
321 // If "/jre/lib/" does NOT appear at the right place in the path
322 // instead of exit check for $JAVA_HOME environment variable.
323 //
324 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
325 // then we append a fake suffix "hotspot/libjvm.so" to this path so
326 // it looks like libjvm.so is installed there
327 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
328 //
329 // Otherwise exit.
330 //
331 // Important note: if the location of libjvm.so changes this
332 // code needs to be changed accordingly.
333
334 // See ld(1):
335 // The linker uses the following search paths to locate required
336 // shared libraries:
337 // 1: ...
338 // ...
339 // 7: The default directories, normally /lib and /usr/lib.
340 #ifndef DEFAULT_LIBPATH
341 #ifndef OVERRIDE_LIBPATH
342 #define DEFAULT_LIBPATH "/lib:/usr/lib"
343 #else
344 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
345 #endif
346 #endif
347
348 // Base path of extensions installed on the system.
349 #define SYS_EXT_DIR "/usr/java/packages"
350 #define EXTENSIONS_DIR "/lib/ext"
351
352 #ifndef __APPLE__
353
354 // Buffer that fits several sprintfs.
355 // Note that the space for the colon and the trailing null are provided
356 // by the nulls included by the sizeof operator.
357 const size_t bufsize =
358 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
359 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
360 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
361
362 // sysclasspath, java_home, dll_dir
363 {
364 char *pslash;
365 os::jvm_path(buf, bufsize);
366
367 // Found the full path to libjvm.so.
368 // Now cut the path to <java_home>/jre if we can.
369 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
370 pslash = strrchr(buf, '/');
371 if (pslash != NULL) {
372 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
373 }
374 Arguments::set_dll_dir(buf);
375
376 if (pslash != NULL) {
377 pslash = strrchr(buf, '/');
378 if (pslash != NULL) {
379 *pslash = '\0'; // Get rid of /<arch>.
380 pslash = strrchr(buf, '/');
381 if (pslash != NULL) {
382 *pslash = '\0'; // Get rid of /lib.
383 }
384 }
385 }
386 Arguments::set_java_home(buf);
387 if (!set_boot_path('/', ':')) {
388 vm_exit_during_initialization("Failed setting boot class path.", NULL);
389 }
390 }
391
392 // Where to look for native libraries.
393 //
394 // Note: Due to a legacy implementation, most of the library path
395 // is set in the launcher. This was to accomodate linking restrictions
396 // on legacy Bsd implementations (which are no longer supported).
397 // Eventually, all the library path setting will be done here.
398 //
399 // However, to prevent the proliferation of improperly built native
400 // libraries, the new path component /usr/java/packages is added here.
401 // Eventually, all the library path setting will be done here.
402 {
403 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
404 // should always exist (until the legacy problem cited above is
405 // addressed).
406 const char *v = ::getenv("LD_LIBRARY_PATH");
407 const char *v_colon = ":";
408 if (v == NULL) { v = ""; v_colon = ""; }
409 // That's +1 for the colon and +1 for the trailing '\0'.
410 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
411 strlen(v) + 1 +
412 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
413 mtInternal);
414 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
415 Arguments::set_library_path(ld_library_path);
416 FREE_C_HEAP_ARRAY(char, ld_library_path);
417 }
418
419 // Extensions directories.
420 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
421 Arguments::set_ext_dirs(buf);
422
423 FREE_C_HEAP_ARRAY(char, buf);
424
425 #else // __APPLE__
426
427 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
428 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
429
430 const char *user_home_dir = get_home();
431 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
432 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
433 sizeof(SYS_EXTENSIONS_DIRS);
434
435 // Buffer that fits several sprintfs.
436 // Note that the space for the colon and the trailing null are provided
437 // by the nulls included by the sizeof operator.
438 const size_t bufsize =
439 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
440 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
441 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
442
443 // sysclasspath, java_home, dll_dir
444 {
445 char *pslash;
446 os::jvm_path(buf, bufsize);
447
448 // Found the full path to libjvm.so.
449 // Now cut the path to <java_home>/jre if we can.
450 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
451 pslash = strrchr(buf, '/');
452 if (pslash != NULL) {
453 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
454 }
455 #ifdef STATIC_BUILD
456 strcat(buf, "/lib");
457 #endif
458
459 Arguments::set_dll_dir(buf);
460
461 if (pslash != NULL) {
462 pslash = strrchr(buf, '/');
463 if (pslash != NULL) {
464 *pslash = '\0'; // Get rid of /lib.
465 }
466 }
467 Arguments::set_java_home(buf);
468 set_boot_path('/', ':');
469 }
470
471 // Where to look for native libraries.
472 //
473 // Note: Due to a legacy implementation, most of the library path
474 // is set in the launcher. This was to accomodate linking restrictions
475 // on legacy Bsd implementations (which are no longer supported).
476 // Eventually, all the library path setting will be done here.
477 //
478 // However, to prevent the proliferation of improperly built native
479 // libraries, the new path component /usr/java/packages is added here.
480 // Eventually, all the library path setting will be done here.
481 {
482 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
483 // should always exist (until the legacy problem cited above is
484 // addressed).
485 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
486 // can specify a directory inside an app wrapper
487 const char *l = ::getenv("JAVA_LIBRARY_PATH");
488 const char *l_colon = ":";
489 if (l == NULL) { l = ""; l_colon = ""; }
490
491 const char *v = ::getenv("DYLD_LIBRARY_PATH");
492 const char *v_colon = ":";
493 if (v == NULL) { v = ""; v_colon = ""; }
494
495 // Apple's Java6 has "." at the beginning of java.library.path.
496 // OpenJDK on Windows has "." at the end of java.library.path.
497 // OpenJDK on Linux and Solaris don't have "." in java.library.path
498 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
499 // "." is appended to the end of java.library.path. Yes, this
500 // could cause a change in behavior, but Apple's Java6 behavior
501 // can be achieved by putting "." at the beginning of the
502 // JAVA_LIBRARY_PATH environment variable.
503 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
504 strlen(v) + 1 + strlen(l) + 1 +
505 system_ext_size + 3,
506 mtInternal);
507 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
508 v, v_colon, l, l_colon, user_home_dir);
509 Arguments::set_library_path(ld_library_path);
510 FREE_C_HEAP_ARRAY(char, ld_library_path);
511 }
512
513 // Extensions directories.
514 //
515 // Note that the space for the colon and the trailing null are provided
516 // by the nulls included by the sizeof operator (so actually one byte more
517 // than necessary is allocated).
518 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
519 user_home_dir, Arguments::get_java_home());
520 Arguments::set_ext_dirs(buf);
521
522 FREE_C_HEAP_ARRAY(char, buf);
523
524 #undef SYS_EXTENSIONS_DIR
525 #undef SYS_EXTENSIONS_DIRS
526
527 #endif // __APPLE__
528
529 #undef SYS_EXT_DIR
530 #undef EXTENSIONS_DIR
531 }
532
533 ////////////////////////////////////////////////////////////////////////////////
534 // breakpoint support
535
536 void os::breakpoint() {
537 BREAKPOINT;
538 }
539
540 extern "C" void breakpoint() {
541 // use debugger to set breakpoint here
542 }
543
544 ////////////////////////////////////////////////////////////////////////////////
545 // signal support
546
547 debug_only(static bool signal_sets_initialized = false);
548 static sigset_t unblocked_sigs, vm_sigs;
549
550 void os::Bsd::signal_sets_init() {
551 // Should also have an assertion stating we are still single-threaded.
552 assert(!signal_sets_initialized, "Already initialized");
553 // Fill in signals that are necessarily unblocked for all threads in
554 // the VM. Currently, we unblock the following signals:
555 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
556 // by -Xrs (=ReduceSignalUsage));
557 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
558 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
559 // the dispositions or masks wrt these signals.
560 // Programs embedding the VM that want to use the above signals for their
561 // own purposes must, at this time, use the "-Xrs" option to prevent
562 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
563 // (See bug 4345157, and other related bugs).
564 // In reality, though, unblocking these signals is really a nop, since
565 // these signals are not blocked by default.
566 sigemptyset(&unblocked_sigs);
567 sigaddset(&unblocked_sigs, SIGILL);
568 sigaddset(&unblocked_sigs, SIGSEGV);
569 sigaddset(&unblocked_sigs, SIGBUS);
570 sigaddset(&unblocked_sigs, SIGFPE);
571 sigaddset(&unblocked_sigs, SR_signum);
572
573 if (!ReduceSignalUsage) {
574 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
575 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
576
577 }
578 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
579 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
580 }
581 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
582 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
583 }
584 }
585 // Fill in signals that are blocked by all but the VM thread.
586 sigemptyset(&vm_sigs);
587 if (!ReduceSignalUsage) {
588 sigaddset(&vm_sigs, BREAK_SIGNAL);
589 }
590 debug_only(signal_sets_initialized = true);
591
592 }
593
594 // These are signals that are unblocked while a thread is running Java.
595 // (For some reason, they get blocked by default.)
596 sigset_t* os::Bsd::unblocked_signals() {
597 assert(signal_sets_initialized, "Not initialized");
598 return &unblocked_sigs;
599 }
600
601 // These are the signals that are blocked while a (non-VM) thread is
602 // running Java. Only the VM thread handles these signals.
603 sigset_t* os::Bsd::vm_signals() {
604 assert(signal_sets_initialized, "Not initialized");
605 return &vm_sigs;
606 }
607
608 void os::Bsd::hotspot_sigmask(Thread* thread) {
609
610 //Save caller's signal mask before setting VM signal mask
611 sigset_t caller_sigmask;
612 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
613
614 OSThread* osthread = thread->osthread();
615 osthread->set_caller_sigmask(caller_sigmask);
616
617 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
618
619 if (!ReduceSignalUsage) {
620 if (thread->is_VM_thread()) {
621 // Only the VM thread handles BREAK_SIGNAL ...
622 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
623 } else {
624 // ... all other threads block BREAK_SIGNAL
625 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
626 }
627 }
628 }
629
630
631 //////////////////////////////////////////////////////////////////////////////
632 // create new thread
633
634 #ifdef __APPLE__
635 // library handle for calling objc_registerThreadWithCollector()
636 // without static linking to the libobjc library
637 #define OBJC_LIB "/usr/lib/libobjc.dylib"
638 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
639 typedef void (*objc_registerThreadWithCollector_t)();
640 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
641 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
642 #endif
643
644 // Thread start routine for all newly created threads
645 static void *thread_native_entry(Thread *thread) {
646
647 thread->record_stack_base_and_size();
648
649 // Try to randomize the cache line index of hot stack frames.
650 // This helps when threads of the same stack traces evict each other's
651 // cache lines. The threads can be either from the same JVM instance, or
652 // from different JVM instances. The benefit is especially true for
653 // processors with hyperthreading technology.
654 static int counter = 0;
655 int pid = os::current_process_id();
656 alloca(((pid ^ counter++) & 7) * 128);
657
658 thread->initialize_thread_current();
659
660 OSThread* osthread = thread->osthread();
661 Monitor* sync = osthread->startThread_lock();
662
663 osthread->set_thread_id(os::Bsd::gettid());
664
665 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
666 os::current_thread_id(), (uintx) pthread_self());
667
668 #ifdef __APPLE__
669 // Store unique OS X thread id used by SA
670 osthread->set_unique_thread_id();
671 #endif
672
673 // initialize signal mask for this thread
674 os::Bsd::hotspot_sigmask(thread);
675
676 // initialize floating point control register
677 os::Bsd::init_thread_fpu_state();
678
679 #ifdef __APPLE__
680 // register thread with objc gc
681 if (objc_registerThreadWithCollectorFunction != NULL) {
682 objc_registerThreadWithCollectorFunction();
683 }
684 #endif
685
686 // handshaking with parent thread
687 {
688 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
689
690 // notify parent thread
691 osthread->set_state(INITIALIZED);
692 sync->notify_all();
693
694 // wait until os::start_thread()
695 while (osthread->get_state() == INITIALIZED) {
696 sync->wait_without_safepoint_check();
697 }
698 }
699
700 // call one more level start routine
701 thread->call_run();
702
703 // Note: at this point the thread object may already have deleted itself.
704 // Prevent dereferencing it from here on out.
705 thread = NULL;
706
707 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
708 os::current_thread_id(), (uintx) pthread_self());
709
710 return 0;
711 }
712
713 bool os::create_thread(Thread* thread, ThreadType thr_type,
714 size_t req_stack_size) {
715 assert(thread->osthread() == NULL, "caller responsible");
716
717 // Allocate the OSThread object
718 OSThread* osthread = new OSThread(NULL, NULL);
719 if (osthread == NULL) {
720 return false;
721 }
722
723 // set the correct thread state
724 osthread->set_thread_type(thr_type);
725
726 // Initial state is ALLOCATED but not INITIALIZED
727 osthread->set_state(ALLOCATED);
728
729 thread->set_osthread(osthread);
730
731 // init thread attributes
732 pthread_attr_t attr;
733 pthread_attr_init(&attr);
734 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
735
736 // calculate stack size if it's not specified by caller
737 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
738 int status = pthread_attr_setstacksize(&attr, stack_size);
739 assert_status(status == 0, status, "pthread_attr_setstacksize");
740
741 ThreadState state;
742
743 {
744 pthread_t tid;
745 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
746
747 char buf[64];
748 if (ret == 0) {
749 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
750 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
751 } else {
752 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
753 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
754 // Log some OS information which might explain why creating the thread failed.
755 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
756 LogStream st(Log(os, thread)::info());
757 os::Posix::print_rlimit_info(&st);
758 os::print_memory_info(&st);
759 }
760
761 pthread_attr_destroy(&attr);
762
763 if (ret != 0) {
764 // Need to clean up stuff we've allocated so far
765 thread->set_osthread(NULL);
766 delete osthread;
767 return false;
768 }
769
770 // Store pthread info into the OSThread
771 osthread->set_pthread_id(tid);
772
773 // Wait until child thread is either initialized or aborted
774 {
775 Monitor* sync_with_child = osthread->startThread_lock();
776 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
777 while ((state = osthread->get_state()) == ALLOCATED) {
778 sync_with_child->wait_without_safepoint_check();
779 }
780 }
781
782 }
783
784 // Aborted due to thread limit being reached
785 if (state == ZOMBIE) {
786 thread->set_osthread(NULL);
787 delete osthread;
788 return false;
789 }
790
791 // The thread is returned suspended (in state INITIALIZED),
792 // and is started higher up in the call chain
793 assert(state == INITIALIZED, "race condition");
794 return true;
795 }
796
797 /////////////////////////////////////////////////////////////////////////////
798 // attach existing thread
799
800 // bootstrap the main thread
801 bool os::create_main_thread(JavaThread* thread) {
802 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
803 return create_attached_thread(thread);
804 }
805
806 bool os::create_attached_thread(JavaThread* thread) {
807 #ifdef ASSERT
808 thread->verify_not_published();
809 #endif
810
811 // Allocate the OSThread object
812 OSThread* osthread = new OSThread(NULL, NULL);
813
814 if (osthread == NULL) {
815 return false;
816 }
817
818 osthread->set_thread_id(os::Bsd::gettid());
819
820 #ifdef __APPLE__
821 // Store unique OS X thread id used by SA
822 osthread->set_unique_thread_id();
823 #endif
824
825 // Store pthread info into the OSThread
826 osthread->set_pthread_id(::pthread_self());
827
828 // initialize floating point control register
829 os::Bsd::init_thread_fpu_state();
830
831 // Initial thread state is RUNNABLE
832 osthread->set_state(RUNNABLE);
833
834 thread->set_osthread(osthread);
835
836 // initialize signal mask for this thread
837 // and save the caller's signal mask
838 os::Bsd::hotspot_sigmask(thread);
839
840 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
841 os::current_thread_id(), (uintx) pthread_self());
842
843 return true;
844 }
845
846 void os::pd_start_thread(Thread* thread) {
847 OSThread * osthread = thread->osthread();
848 assert(osthread->get_state() != INITIALIZED, "just checking");
849 Monitor* sync_with_child = osthread->startThread_lock();
850 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
851 sync_with_child->notify();
852 }
853
854 // Free Bsd resources related to the OSThread
855 void os::free_thread(OSThread* osthread) {
856 assert(osthread != NULL, "osthread not set");
857
858 // We are told to free resources of the argument thread,
859 // but we can only really operate on the current thread.
860 assert(Thread::current()->osthread() == osthread,
861 "os::free_thread but not current thread");
862
863 // Restore caller's signal mask
864 sigset_t sigmask = osthread->caller_sigmask();
865 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
866
867 delete osthread;
868 }
869
870 ////////////////////////////////////////////////////////////////////////////////
871 // time support
872
873 // Time since start-up in seconds to a fine granularity.
874 // Used by VMSelfDestructTimer and the MemProfiler.
875 double os::elapsedTime() {
876
877 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
878 }
879
880 jlong os::elapsed_counter() {
881 return javaTimeNanos() - initial_time_count;
882 }
883
884 jlong os::elapsed_frequency() {
885 return NANOSECS_PER_SEC; // nanosecond resolution
886 }
887
888 bool os::supports_vtime() { return true; }
889
890 double os::elapsedVTime() {
891 // better than nothing, but not much
892 return elapsedTime();
893 }
894
895 jlong os::javaTimeMillis() {
896 timeval time;
897 int status = gettimeofday(&time, NULL);
898 assert(status != -1, "bsd error");
899 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
900 }
901
902 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
903 timeval time;
904 int status = gettimeofday(&time, NULL);
905 assert(status != -1, "bsd error");
906 seconds = jlong(time.tv_sec);
907 nanos = jlong(time.tv_usec) * 1000;
908 }
909
910 #ifndef __APPLE__
911 #ifndef CLOCK_MONOTONIC
912 #define CLOCK_MONOTONIC (1)
913 #endif
914 #endif
915
916 #ifdef __APPLE__
917 void os::Bsd::clock_init() {
918 mach_timebase_info(&_timebase_info);
919 }
920 #else
921 void os::Bsd::clock_init() {
922 struct timespec res;
923 struct timespec tp;
924 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
925 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
926 // yes, monotonic clock is supported
927 _clock_gettime = ::clock_gettime;
928 }
929 }
930 #endif
931
932
933
934 #ifdef __APPLE__
935
936 jlong os::javaTimeNanos() {
937 const uint64_t tm = mach_absolute_time();
938 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
939 const uint64_t prev = Bsd::_max_abstime;
940 if (now <= prev) {
941 return prev; // same or retrograde time;
942 }
943 const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now);
944 assert(obsv >= prev, "invariant"); // Monotonicity
945 // If the CAS succeeded then we're done and return "now".
946 // If the CAS failed and the observed value "obsv" is >= now then
947 // we should return "obsv". If the CAS failed and now > obsv > prv then
948 // some other thread raced this thread and installed a new value, in which case
949 // we could either (a) retry the entire operation, (b) retry trying to install now
950 // or (c) just return obsv. We use (c). No loop is required although in some cases
951 // we might discard a higher "now" value in deference to a slightly lower but freshly
952 // installed obsv value. That's entirely benign -- it admits no new orderings compared
953 // to (a) or (b) -- and greatly reduces coherence traffic.
954 // We might also condition (c) on the magnitude of the delta between obsv and now.
955 // Avoiding excessive CAS operations to hot RW locations is critical.
956 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
957 return (prev == obsv) ? now : obsv;
958 }
959
960 #else // __APPLE__
961
962 jlong os::javaTimeNanos() {
963 if (os::supports_monotonic_clock()) {
964 struct timespec tp;
965 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
966 assert(status == 0, "gettime error");
967 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
968 return result;
969 } else {
970 timeval time;
971 int status = gettimeofday(&time, NULL);
972 assert(status != -1, "bsd error");
973 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
974 return 1000 * usecs;
975 }
976 }
977
978 #endif // __APPLE__
979
980 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
981 if (os::supports_monotonic_clock()) {
982 info_ptr->max_value = ALL_64_BITS;
983
984 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
985 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
986 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
987 } else {
988 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
989 info_ptr->max_value = ALL_64_BITS;
990
991 // gettimeofday is a real time clock so it skips
992 info_ptr->may_skip_backward = true;
993 info_ptr->may_skip_forward = true;
994 }
995
996 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
997 }
998
999 // Return the real, user, and system times in seconds from an
1000 // arbitrary fixed point in the past.
1001 bool os::getTimesSecs(double* process_real_time,
1002 double* process_user_time,
1003 double* process_system_time) {
1004 struct tms ticks;
1005 clock_t real_ticks = times(&ticks);
1006
1007 if (real_ticks == (clock_t) (-1)) {
1008 return false;
1009 } else {
1010 double ticks_per_second = (double) clock_tics_per_sec;
1011 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1012 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1013 *process_real_time = ((double) real_ticks) / ticks_per_second;
1014
1015 return true;
1016 }
1017 }
1018
1019
1020 char * os::local_time_string(char *buf, size_t buflen) {
1021 struct tm t;
1022 time_t long_time;
1023 time(&long_time);
1024 localtime_r(&long_time, &t);
1025 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1026 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1027 t.tm_hour, t.tm_min, t.tm_sec);
1028 return buf;
1029 }
1030
1031 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1032 return localtime_r(clock, res);
1033 }
1034
1035 ////////////////////////////////////////////////////////////////////////////////
1036 // runtime exit support
1037
1038 // Note: os::shutdown() might be called very early during initialization, or
1039 // called from signal handler. Before adding something to os::shutdown(), make
1040 // sure it is async-safe and can handle partially initialized VM.
1041 void os::shutdown() {
1042
1043 // allow PerfMemory to attempt cleanup of any persistent resources
1044 perfMemory_exit();
1045
1046 // needs to remove object in file system
1047 AttachListener::abort();
1048
1049 // flush buffered output, finish log files
1050 ostream_abort();
1051
1052 // Check for abort hook
1053 abort_hook_t abort_hook = Arguments::abort_hook();
1054 if (abort_hook != NULL) {
1055 abort_hook();
1056 }
1057
1058 }
1059
1060 // Note: os::abort() might be called very early during initialization, or
1061 // called from signal handler. Before adding something to os::abort(), make
1062 // sure it is async-safe and can handle partially initialized VM.
1063 void os::abort(bool dump_core, void* siginfo, const void* context) {
1064 os::shutdown();
1065 if (dump_core) {
1066 ::abort(); // dump core
1067 }
1068
1069 ::exit(1);
1070 }
1071
1072 // Die immediately, no exit hook, no abort hook, no cleanup.
1073 // Dump a core file, if possible, for debugging.
1074 void os::die() {
1075 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1076 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1077 // and don't take the time to generate a core file.
1078 os::signal_raise(SIGKILL);
1079 } else {
1080 // _exit() on BsdThreads only kills current thread
1081 ::abort();
1082 }
1083 }
1084
1085 // Information of current thread in variety of formats
1086 pid_t os::Bsd::gettid() {
1087 int retval = -1;
1088
1089 #ifdef __APPLE__ // XNU kernel
1090 mach_port_t port = mach_thread_self();
1091 guarantee(MACH_PORT_VALID(port), "just checking");
1092 mach_port_deallocate(mach_task_self(), port);
1093 return (pid_t)port;
1094
1095 #else
1096 #ifdef __FreeBSD__
1097 retval = syscall(SYS_thr_self);
1098 #else
1099 #ifdef __OpenBSD__
1100 retval = syscall(SYS_getthrid);
1101 #else
1102 #ifdef __NetBSD__
1103 retval = (pid_t) syscall(SYS__lwp_self);
1104 #endif
1105 #endif
1106 #endif
1107 #endif
1108
1109 if (retval == -1) {
1110 return getpid();
1111 }
1112 }
1113
1114 intx os::current_thread_id() {
1115 #ifdef __APPLE__
1116 return (intx)os::Bsd::gettid();
1117 #else
1118 return (intx)::pthread_self();
1119 #endif
1120 }
1121
1122 int os::current_process_id() {
1123 return (int)(getpid());
1124 }
1125
1126 // DLL functions
1127
1128 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1129
1130 // This must be hard coded because it's the system's temporary
1131 // directory not the java application's temp directory, ala java.io.tmpdir.
1132 #ifdef __APPLE__
1133 // macosx has a secure per-user temporary directory
1134 char temp_path_storage[PATH_MAX];
1135 const char* os::get_temp_directory() {
1136 static char *temp_path = NULL;
1137 if (temp_path == NULL) {
1138 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1139 if (pathSize == 0 || pathSize > PATH_MAX) {
1140 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1141 }
1142 temp_path = temp_path_storage;
1143 }
1144 return temp_path;
1145 }
1146 #else // __APPLE__
1147 const char* os::get_temp_directory() { return "/tmp"; }
1148 #endif // __APPLE__
1149
1150 // check if addr is inside libjvm.so
1151 bool os::address_is_in_vm(address addr) {
1152 static address libjvm_base_addr;
1153 Dl_info dlinfo;
1154
1155 if (libjvm_base_addr == NULL) {
1156 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1157 libjvm_base_addr = (address)dlinfo.dli_fbase;
1158 }
1159 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1160 }
1161
1162 if (dladdr((void *)addr, &dlinfo) != 0) {
1163 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1164 }
1165
1166 return false;
1167 }
1168
1169
1170 #define MACH_MAXSYMLEN 256
1171
1172 bool os::dll_address_to_function_name(address addr, char *buf,
1173 int buflen, int *offset,
1174 bool demangle) {
1175 // buf is not optional, but offset is optional
1176 assert(buf != NULL, "sanity check");
1177
1178 Dl_info dlinfo;
1179 char localbuf[MACH_MAXSYMLEN];
1180
1181 if (dladdr((void*)addr, &dlinfo) != 0) {
1182 // see if we have a matching symbol
1183 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1184 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1185 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1186 }
1187 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1188 return true;
1189 }
1190 // no matching symbol so try for just file info
1191 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1192 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1193 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1194 return true;
1195 }
1196 }
1197
1198 // Handle non-dynamic manually:
1199 if (dlinfo.dli_fbase != NULL &&
1200 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1201 dlinfo.dli_fbase)) {
1202 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1203 jio_snprintf(buf, buflen, "%s", localbuf);
1204 }
1205 return true;
1206 }
1207 }
1208 buf[0] = '\0';
1209 if (offset != NULL) *offset = -1;
1210 return false;
1211 }
1212
1213 // ported from solaris version
1214 bool os::dll_address_to_library_name(address addr, char* buf,
1215 int buflen, int* offset) {
1216 // buf is not optional, but offset is optional
1217 assert(buf != NULL, "sanity check");
1218
1219 Dl_info dlinfo;
1220
1221 if (dladdr((void*)addr, &dlinfo) != 0) {
1222 if (dlinfo.dli_fname != NULL) {
1223 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1224 }
1225 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1226 *offset = addr - (address)dlinfo.dli_fbase;
1227 }
1228 return true;
1229 }
1230
1231 buf[0] = '\0';
1232 if (offset) *offset = -1;
1233 return false;
1234 }
1235
1236 // Loads .dll/.so and
1237 // in case of error it checks if .dll/.so was built for the
1238 // same architecture as Hotspot is running on
1239
1240 #ifdef __APPLE__
1241 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1242 #ifdef STATIC_BUILD
1243 return os::get_default_process_handle();
1244 #else
1245 log_info(os)("attempting shared library load of %s", filename);
1246
1247 void * result= ::dlopen(filename, RTLD_LAZY);
1248 if (result != NULL) {
1249 Events::log(NULL, "Loaded shared library %s", filename);
1250 // Successful loading
1251 log_info(os)("shared library load of %s was successful", filename);
1252 return result;
1253 }
1254
1255 const char* error_report = ::dlerror();
1256 if (error_report == NULL) {
1257 error_report = "dlerror returned no error description";
1258 }
1259 if (ebuf != NULL && ebuflen > 0) {
1260 // Read system error message into ebuf
1261 ::strncpy(ebuf, error_report, ebuflen-1);
1262 ebuf[ebuflen-1]='\0';
1263 }
1264 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1265 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1266
1267 return NULL;
1268 #endif // STATIC_BUILD
1269 }
1270 #else
1271 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1272 #ifdef STATIC_BUILD
1273 return os::get_default_process_handle();
1274 #else
1275 log_info(os)("attempting shared library load of %s", filename);
1276 void * result= ::dlopen(filename, RTLD_LAZY);
1277 if (result != NULL) {
1278 Events::log(NULL, "Loaded shared library %s", filename);
1279 // Successful loading
1280 log_info(os)("shared library load of %s was successful", filename);
1281 return result;
1282 }
1283
1284 Elf32_Ehdr elf_head;
1285
1286 const char* const error_report = ::dlerror();
1287 if (error_report == NULL) {
1288 error_report = "dlerror returned no error description";
1289 }
1290 if (ebuf != NULL && ebuflen > 0) {
1291 // Read system error message into ebuf
1292 ::strncpy(ebuf, error_report, ebuflen-1);
1293 ebuf[ebuflen-1]='\0';
1294 }
1295 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1296 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1297
1298 int diag_msg_max_length=ebuflen-strlen(ebuf);
1299 char* diag_msg_buf=ebuf+strlen(ebuf);
1300
1301 if (diag_msg_max_length==0) {
1302 // No more space in ebuf for additional diagnostics message
1303 return NULL;
1304 }
1305
1306
1307 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1308
1309 if (file_descriptor < 0) {
1310 // Can't open library, report dlerror() message
1311 return NULL;
1312 }
1313
1314 bool failed_to_read_elf_head=
1315 (sizeof(elf_head)!=
1316 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1317
1318 ::close(file_descriptor);
1319 if (failed_to_read_elf_head) {
1320 // file i/o error - report dlerror() msg
1321 return NULL;
1322 }
1323
1324 typedef struct {
1325 Elf32_Half code; // Actual value as defined in elf.h
1326 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1327 char elf_class; // 32 or 64 bit
1328 char endianess; // MSB or LSB
1329 char* name; // String representation
1330 } arch_t;
1331
1332 #ifndef EM_486
1333 #define EM_486 6 /* Intel 80486 */
1334 #endif
1335
1336 #ifndef EM_MIPS_RS3_LE
1337 #define EM_MIPS_RS3_LE 10 /* MIPS */
1338 #endif
1339
1340 #ifndef EM_PPC64
1341 #define EM_PPC64 21 /* PowerPC64 */
1342 #endif
1343
1344 #ifndef EM_S390
1345 #define EM_S390 22 /* IBM System/390 */
1346 #endif
1347
1348 #ifndef EM_IA_64
1349 #define EM_IA_64 50 /* HP/Intel IA-64 */
1350 #endif
1351
1352 #ifndef EM_X86_64
1353 #define EM_X86_64 62 /* AMD x86-64 */
1354 #endif
1355
1356 static const arch_t arch_array[]={
1357 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1358 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1359 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1360 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1361 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1362 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1363 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1364 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1365 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1366 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1367 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1368 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1369 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1370 };
1371
1372 #if (defined IA32)
1373 static Elf32_Half running_arch_code=EM_386;
1374 #elif (defined AMD64)
1375 static Elf32_Half running_arch_code=EM_X86_64;
1376 #elif (defined IA64)
1377 static Elf32_Half running_arch_code=EM_IA_64;
1378 #elif (defined __powerpc64__)
1379 static Elf32_Half running_arch_code=EM_PPC64;
1380 #elif (defined __powerpc__)
1381 static Elf32_Half running_arch_code=EM_PPC;
1382 #elif (defined ARM)
1383 static Elf32_Half running_arch_code=EM_ARM;
1384 #elif (defined S390)
1385 static Elf32_Half running_arch_code=EM_S390;
1386 #elif (defined ALPHA)
1387 static Elf32_Half running_arch_code=EM_ALPHA;
1388 #elif (defined MIPSEL)
1389 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1390 #elif (defined PARISC)
1391 static Elf32_Half running_arch_code=EM_PARISC;
1392 #elif (defined MIPS)
1393 static Elf32_Half running_arch_code=EM_MIPS;
1394 #elif (defined M68K)
1395 static Elf32_Half running_arch_code=EM_68K;
1396 #else
1397 #error Method os::dll_load requires that one of following is defined:\
1398 IA32, AMD64, IA64, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1399 #endif
1400
1401 // Identify compatability class for VM's architecture and library's architecture
1402 // Obtain string descriptions for architectures
1403
1404 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1405 int running_arch_index=-1;
1406
1407 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1408 if (running_arch_code == arch_array[i].code) {
1409 running_arch_index = i;
1410 }
1411 if (lib_arch.code == arch_array[i].code) {
1412 lib_arch.compat_class = arch_array[i].compat_class;
1413 lib_arch.name = arch_array[i].name;
1414 }
1415 }
1416
1417 assert(running_arch_index != -1,
1418 "Didn't find running architecture code (running_arch_code) in arch_array");
1419 if (running_arch_index == -1) {
1420 // Even though running architecture detection failed
1421 // we may still continue with reporting dlerror() message
1422 return NULL;
1423 }
1424
1425 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1426 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1427 return NULL;
1428 }
1429
1430 #ifndef S390
1431 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1432 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1433 return NULL;
1434 }
1435 #endif // !S390
1436
1437 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1438 if (lib_arch.name!=NULL) {
1439 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1440 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1441 lib_arch.name, arch_array[running_arch_index].name);
1442 } else {
1443 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1444 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1445 lib_arch.code,
1446 arch_array[running_arch_index].name);
1447 }
1448 }
1449
1450 return NULL;
1451 #endif // STATIC_BUILD
1452 }
1453 #endif // !__APPLE__
1454
1455 void* os::get_default_process_handle() {
1456 #ifdef __APPLE__
1457 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1458 // to avoid finding unexpected symbols on second (or later)
1459 // loads of a library.
1460 return (void*)::dlopen(NULL, RTLD_FIRST);
1461 #else
1462 return (void*)::dlopen(NULL, RTLD_LAZY);
1463 #endif
1464 }
1465
1466 // XXX: Do we need a lock around this as per Linux?
1467 void* os::dll_lookup(void* handle, const char* name) {
1468 return dlsym(handle, name);
1469 }
1470
1471 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1472 outputStream * out = (outputStream *) param;
1473 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1474 return 0;
1475 }
1476
1477 void os::print_dll_info(outputStream *st) {
1478 st->print_cr("Dynamic libraries:");
1479 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1480 st->print_cr("Error: Cannot print dynamic libraries.");
1481 }
1482 }
1483
1484 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1485 #ifdef RTLD_DI_LINKMAP
1486 Dl_info dli;
1487 void *handle;
1488 Link_map *map;
1489 Link_map *p;
1490
1491 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1492 dli.dli_fname == NULL) {
1493 return 1;
1494 }
1495 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1496 if (handle == NULL) {
1497 return 1;
1498 }
1499 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1500 if (map == NULL) {
1501 dlclose(handle);
1502 return 1;
1503 }
1504
1505 while (map->l_prev != NULL)
1506 map = map->l_prev;
1507
1508 while (map != NULL) {
1509 // Value for top_address is returned as 0 since we don't have any information about module size
1510 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1511 dlclose(handle);
1512 return 1;
1513 }
1514 map = map->l_next;
1515 }
1516
1517 dlclose(handle);
1518 #elif defined(__APPLE__)
1519 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1520 // Value for top_address is returned as 0 since we don't have any information about module size
1521 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1522 return 1;
1523 }
1524 }
1525 return 0;
1526 #else
1527 return 1;
1528 #endif
1529 }
1530
1531 void os::get_summary_os_info(char* buf, size_t buflen) {
1532 // These buffers are small because we want this to be brief
1533 // and not use a lot of stack while generating the hs_err file.
1534 char os[100];
1535 size_t size = sizeof(os);
1536 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1537 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1538 #ifdef __APPLE__
1539 strncpy(os, "Darwin", sizeof(os));
1540 #elif __OpenBSD__
1541 strncpy(os, "OpenBSD", sizeof(os));
1542 #else
1543 strncpy(os, "BSD", sizeof(os));
1544 #endif
1545 }
1546
1547 char release[100];
1548 size = sizeof(release);
1549 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1550 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1551 // if error, leave blank
1552 strncpy(release, "", sizeof(release));
1553 }
1554
1555 #ifdef __APPLE__
1556 char osproductversion[100];
1557 size_t sz = sizeof(osproductversion);
1558 int ret = sysctlbyname("kern.osproductversion", osproductversion, &sz, NULL, 0);
1559 if (ret == 0) {
1560 char build[100];
1561 size = sizeof(build);
1562 int mib_build[] = { CTL_KERN, KERN_OSVERSION };
1563 if (sysctl(mib_build, 2, build, &size, NULL, 0) < 0) {
1564 snprintf(buf, buflen, "%s %s, macOS %s", os, release, osproductversion);
1565 } else {
1566 snprintf(buf, buflen, "%s %s, macOS %s (%s)", os, release, osproductversion, build);
1567 }
1568 } else
1569 #endif
1570 snprintf(buf, buflen, "%s %s", os, release);
1571 }
1572
1573 void os::print_os_info_brief(outputStream* st) {
1574 os::Posix::print_uname_info(st);
1575 }
1576
1577 void os::print_os_info(outputStream* st) {
1578 st->print("OS:");
1579
1580 os::Posix::print_uname_info(st);
1581
1582 os::Bsd::print_uptime_info(st);
1583
1584 os::Posix::print_rlimit_info(st);
1585
1586 os::Posix::print_load_average(st);
1587
1588 VM_Version::print_platform_virtualization_info(st);
1589 }
1590
1591 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1592 // Nothing to do for now.
1593 }
1594
1595 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1596 unsigned int mhz;
1597 size_t size = sizeof(mhz);
1598 int mib[] = { CTL_HW, HW_CPU_FREQ };
1599 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1600 mhz = 1; // looks like an error but can be divided by
1601 } else {
1602 mhz /= 1000000; // reported in millions
1603 }
1604
1605 char model[100];
1606 size = sizeof(model);
1607 int mib_model[] = { CTL_HW, HW_MODEL };
1608 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1609 strncpy(model, cpu_arch, sizeof(model));
1610 }
1611
1612 char machine[100];
1613 size = sizeof(machine);
1614 int mib_machine[] = { CTL_HW, HW_MACHINE };
1615 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1616 strncpy(machine, "", sizeof(machine));
1617 }
1618
1619 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1620 }
1621
1622 void os::print_memory_info(outputStream* st) {
1623 xsw_usage swap_usage;
1624 size_t size = sizeof(swap_usage);
1625
1626 st->print("Memory:");
1627 st->print(" %dk page", os::vm_page_size()>>10);
1628
1629 st->print(", physical " UINT64_FORMAT "k",
1630 os::physical_memory() >> 10);
1631 st->print("(" UINT64_FORMAT "k free)",
1632 os::available_memory() >> 10);
1633
1634 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1635 if (size >= offset_of(xsw_usage, xsu_used)) {
1636 st->print(", swap " UINT64_FORMAT "k",
1637 ((julong) swap_usage.xsu_total) >> 10);
1638 st->print("(" UINT64_FORMAT "k free)",
1639 ((julong) swap_usage.xsu_avail) >> 10);
1640 }
1641 }
1642
1643 st->cr();
1644 }
1645
1646 static void print_signal_handler(outputStream* st, int sig,
1647 char* buf, size_t buflen);
1648
1649 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1650 st->print_cr("Signal Handlers:");
1651 print_signal_handler(st, SIGSEGV, buf, buflen);
1652 print_signal_handler(st, SIGBUS , buf, buflen);
1653 print_signal_handler(st, SIGFPE , buf, buflen);
1654 print_signal_handler(st, SIGPIPE, buf, buflen);
1655 print_signal_handler(st, SIGXFSZ, buf, buflen);
1656 print_signal_handler(st, SIGILL , buf, buflen);
1657 print_signal_handler(st, SR_signum, buf, buflen);
1658 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1659 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1660 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1661 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1662 }
1663
1664 static char saved_jvm_path[MAXPATHLEN] = {0};
1665
1666 // Find the full path to the current module, libjvm
1667 void os::jvm_path(char *buf, jint buflen) {
1668 // Error checking.
1669 if (buflen < MAXPATHLEN) {
1670 assert(false, "must use a large-enough buffer");
1671 buf[0] = '\0';
1672 return;
1673 }
1674 // Lazy resolve the path to current module.
1675 if (saved_jvm_path[0] != 0) {
1676 strcpy(buf, saved_jvm_path);
1677 return;
1678 }
1679
1680 char dli_fname[MAXPATHLEN];
1681 bool ret = dll_address_to_library_name(
1682 CAST_FROM_FN_PTR(address, os::jvm_path),
1683 dli_fname, sizeof(dli_fname), NULL);
1684 assert(ret, "cannot locate libjvm");
1685 char *rp = NULL;
1686 if (ret && dli_fname[0] != '\0') {
1687 rp = os::Posix::realpath(dli_fname, buf, buflen);
1688 }
1689 if (rp == NULL) {
1690 return;
1691 }
1692
1693 if (Arguments::sun_java_launcher_is_altjvm()) {
1694 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1695 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1696 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1697 // appears at the right place in the string, then assume we are
1698 // installed in a JDK and we're done. Otherwise, check for a
1699 // JAVA_HOME environment variable and construct a path to the JVM
1700 // being overridden.
1701
1702 const char *p = buf + strlen(buf) - 1;
1703 for (int count = 0; p > buf && count < 5; ++count) {
1704 for (--p; p > buf && *p != '/'; --p)
1705 /* empty */ ;
1706 }
1707
1708 if (strncmp(p, "/jre/lib/", 9) != 0) {
1709 // Look for JAVA_HOME in the environment.
1710 char* java_home_var = ::getenv("JAVA_HOME");
1711 if (java_home_var != NULL && java_home_var[0] != 0) {
1712 char* jrelib_p;
1713 int len;
1714
1715 // Check the current module name "libjvm"
1716 p = strrchr(buf, '/');
1717 assert(strstr(p, "/libjvm") == p, "invalid library name");
1718
1719 rp = os::Posix::realpath(java_home_var, buf, buflen);
1720 if (rp == NULL) {
1721 return;
1722 }
1723
1724 // determine if this is a legacy image or modules image
1725 // modules image doesn't have "jre" subdirectory
1726 len = strlen(buf);
1727 assert(len < buflen, "Ran out of buffer space");
1728 jrelib_p = buf + len;
1729
1730 // Add the appropriate library subdir
1731 snprintf(jrelib_p, buflen-len, "/jre/lib");
1732 if (0 != access(buf, F_OK)) {
1733 snprintf(jrelib_p, buflen-len, "/lib");
1734 }
1735
1736 // Add the appropriate client or server subdir
1737 len = strlen(buf);
1738 jrelib_p = buf + len;
1739 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1740 if (0 != access(buf, F_OK)) {
1741 snprintf(jrelib_p, buflen-len, "%s", "");
1742 }
1743
1744 // If the path exists within JAVA_HOME, add the JVM library name
1745 // to complete the path to JVM being overridden. Otherwise fallback
1746 // to the path to the current library.
1747 if (0 == access(buf, F_OK)) {
1748 // Use current module name "libjvm"
1749 len = strlen(buf);
1750 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1751 } else {
1752 // Fall back to path of current library
1753 rp = os::Posix::realpath(dli_fname, buf, buflen);
1754 if (rp == NULL) {
1755 return;
1756 }
1757 }
1758 }
1759 }
1760 }
1761
1762 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1763 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1764 }
1765
1766 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1767 // no prefix required, not even "_"
1768 }
1769
1770 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1771 // no suffix required
1772 }
1773
1774 ////////////////////////////////////////////////////////////////////////////////
1775 // sun.misc.Signal support
1776
1777 static void UserHandler(int sig, void *siginfo, void *context) {
1778 // Ctrl-C is pressed during error reporting, likely because the error
1779 // handler fails to abort. Let VM die immediately.
1780 if (sig == SIGINT && VMError::is_error_reported()) {
1781 os::die();
1782 }
1783
1784 os::signal_notify(sig);
1785 }
1786
1787 void* os::user_handler() {
1788 return CAST_FROM_FN_PTR(void*, UserHandler);
1789 }
1790
1791 extern "C" {
1792 typedef void (*sa_handler_t)(int);
1793 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1794 }
1795
1796 void* os::signal(int signal_number, void* handler) {
1797 struct sigaction sigAct, oldSigAct;
1798
1799 sigfillset(&(sigAct.sa_mask));
1800 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1801 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1802
1803 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1804 // -1 means registration failed
1805 return (void *)-1;
1806 }
1807
1808 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1809 }
1810
1811 void os::signal_raise(int signal_number) {
1812 ::raise(signal_number);
1813 }
1814
1815 // The following code is moved from os.cpp for making this
1816 // code platform specific, which it is by its very nature.
1817
1818 // Will be modified when max signal is changed to be dynamic
1819 int os::sigexitnum_pd() {
1820 return NSIG;
1821 }
1822
1823 // a counter for each possible signal value
1824 static volatile jint pending_signals[NSIG+1] = { 0 };
1825 static Semaphore* sig_sem = NULL;
1826
1827 static void jdk_misc_signal_init() {
1828 // Initialize signal structures
1829 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1830
1831 // Initialize signal semaphore
1832 sig_sem = new Semaphore();
1833 }
1834
1835 void os::signal_notify(int sig) {
1836 if (sig_sem != NULL) {
1837 Atomic::inc(&pending_signals[sig]);
1838 sig_sem->signal();
1839 } else {
1840 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1841 // initialization isn't called.
1842 assert(ReduceSignalUsage, "signal semaphore should be created");
1843 }
1844 }
1845
1846 static int check_pending_signals() {
1847 for (;;) {
1848 for (int i = 0; i < NSIG + 1; i++) {
1849 jint n = pending_signals[i];
1850 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1851 return i;
1852 }
1853 }
1854 JavaThread *thread = JavaThread::current();
1855 ThreadBlockInVM tbivm(thread);
1856
1857 bool threadIsSuspended;
1858 do {
1859 thread->set_suspend_equivalent();
1860 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1861 sig_sem->wait();
1862
1863 // were we externally suspended while we were waiting?
1864 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1865 if (threadIsSuspended) {
1866 // The semaphore has been incremented, but while we were waiting
1867 // another thread suspended us. We don't want to continue running
1868 // while suspended because that would surprise the thread that
1869 // suspended us.
1870 sig_sem->signal();
1871
1872 thread->java_suspend_self();
1873 }
1874 } while (threadIsSuspended);
1875 }
1876 }
1877
1878 int os::signal_wait() {
1879 return check_pending_signals();
1880 }
1881
1882 ////////////////////////////////////////////////////////////////////////////////
1883 // Virtual Memory
1884
1885 int os::vm_page_size() {
1886 // Seems redundant as all get out
1887 assert(os::Bsd::page_size() != -1, "must call os::init");
1888 return os::Bsd::page_size();
1889 }
1890
1891 // Solaris allocates memory by pages.
1892 int os::vm_allocation_granularity() {
1893 assert(os::Bsd::page_size() != -1, "must call os::init");
1894 return os::Bsd::page_size();
1895 }
1896
1897 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1898 int err) {
1899 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1900 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1901 os::errno_name(err), err);
1902 }
1903
1904 // NOTE: Bsd kernel does not really reserve the pages for us.
1905 // All it does is to check if there are enough free pages
1906 // left at the time of mmap(). This could be a potential
1907 // problem.
1908 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1909 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1910 #if defined(__OpenBSD__)
1911 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1912 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1913 if (::mprotect(addr, size, prot) == 0) {
1914 return true;
1915 }
1916 #elif defined(__APPLE__)
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 int os::numa_get_group_id_for_address(const void* address) {
1990 return 0;
1991 }
1992
1993 bool os::get_page_info(char *start, page_info* info) {
1994 return false;
1995 }
1996
1997 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
1998 return end;
1999 }
2000
2001
2002 bool os::pd_uncommit_memory(char* addr, size_t size, bool exec) {
2003 #if defined(__OpenBSD__)
2004 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2005 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2006 return ::mprotect(addr, size, PROT_NONE) == 0;
2007 #elif defined(__APPLE__)
2008 if (exec) {
2009 if (::madvise(addr, size, MADV_FREE) != 0) {
2010 return false;
2011 }
2012 return ::mprotect(addr, size, PROT_NONE) == 0;
2013 } else {
2014 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2015 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2016 return res != (uintptr_t) MAP_FAILED;
2017 }
2018 #else
2019 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2020 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2021 return res != (uintptr_t) MAP_FAILED;
2022 #endif
2023 }
2024
2025 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2026 return os::commit_memory(addr, size, !ExecMem);
2027 }
2028
2029 // If this is a growable mapping, remove the guard pages entirely by
2030 // munmap()ping them. If not, just call uncommit_memory().
2031 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2032 return os::uncommit_memory(addr, size, !ExecMem);
2033 }
2034
2035 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2036 // at 'requested_addr'. If there are existing memory mappings at the same
2037 // location, however, they will be overwritten. If 'fixed' is false,
2038 // 'requested_addr' is only treated as a hint, the return value may or
2039 // may not start from the requested address. Unlike Bsd mmap(), this
2040 // function returns NULL to indicate failure.
2041 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed, bool executable) {
2042 char * addr;
2043 int flags;
2044
2045 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2046 #ifdef __APPLE__
2047 if (executable) {
2048 guarantee(!fixed, "MAP_JIT (for execute) is incompatible with MAP_FIXED");
2049 flags |= MAP_JIT;
2050 }
2051 #endif
2052 if (fixed) {
2053 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2054 flags |= MAP_FIXED;
2055 }
2056
2057 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2058 // touch an uncommitted page. Otherwise, the read/write might
2059 // succeed if we have enough swap space to back the physical page.
2060 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2061 flags, -1, 0);
2062
2063 return addr == MAP_FAILED ? NULL : addr;
2064 }
2065
2066 static int anon_munmap(char * addr, size_t size) {
2067 return ::munmap(addr, size) == 0;
2068 }
2069
2070 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2071 size_t alignment_hint,
2072 bool executable) {
2073 return anon_mmap(requested_addr, bytes, (requested_addr != NULL), executable);
2074 }
2075
2076 bool os::pd_release_memory(char* addr, size_t size) {
2077 return anon_munmap(addr, size);
2078 }
2079
2080 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2081 // Bsd wants the mprotect address argument to be page aligned.
2082 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2083
2084 // According to SUSv3, mprotect() should only be used with mappings
2085 // established by mmap(), and mmap() always maps whole pages. Unaligned
2086 // 'addr' likely indicates problem in the VM (e.g. trying to change
2087 // protection of malloc'ed or statically allocated memory). Check the
2088 // caller if you hit this assert.
2089 assert(addr == bottom, "sanity check");
2090
2091 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2092 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2093 return ::mprotect(bottom, size, prot) == 0;
2094 }
2095
2096 // Set protections specified
2097 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2098 bool is_committed) {
2099 unsigned int p = 0;
2100 switch (prot) {
2101 case MEM_PROT_NONE: p = PROT_NONE; break;
2102 case MEM_PROT_READ: p = PROT_READ; break;
2103 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2104 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2105 default:
2106 ShouldNotReachHere();
2107 }
2108 // is_committed is unused.
2109 return bsd_mprotect(addr, bytes, p);
2110 }
2111
2112 bool os::guard_memory(char* addr, size_t size) {
2113 return bsd_mprotect(addr, size, PROT_NONE);
2114 }
2115
2116 bool os::unguard_memory(char* addr, size_t size) {
2117 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2118 }
2119
2120 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2121 return false;
2122 }
2123
2124 // Large page support
2125
2126 static size_t _large_page_size = 0;
2127
2128 void os::large_page_init() {
2129 }
2130
2131
2132 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2133 fatal("os::reserve_memory_special should not be called on BSD.");
2134 return NULL;
2135 }
2136
2137 bool os::pd_release_memory_special(char* base, size_t bytes) {
2138 fatal("os::release_memory_special should not be called on BSD.");
2139 return false;
2140 }
2141
2142 size_t os::large_page_size() {
2143 return _large_page_size;
2144 }
2145
2146 bool os::can_commit_large_page_memory() {
2147 // Does not matter, we do not support huge pages.
2148 return false;
2149 }
2150
2151 bool os::can_execute_large_page_memory() {
2152 // Does not matter, we do not support huge pages.
2153 return false;
2154 }
2155
2156 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2157 assert(file_desc >= 0, "file_desc is not valid");
2158 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2159 if (result != NULL) {
2160 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2161 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2162 }
2163 }
2164 return result;
2165 }
2166
2167 // Reserve memory at an arbitrary address, only if that area is
2168 // available (and not reserved for something else).
2169
2170 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2171 // Assert only that the size is a multiple of the page size, since
2172 // that's all that mmap requires, and since that's all we really know
2173 // about at this low abstraction level. If we need higher alignment,
2174 // we can either pass an alignment to this method or verify alignment
2175 // in one of the methods further up the call chain. See bug 5044738.
2176 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2177
2178 // Repeatedly allocate blocks until the block is allocated at the
2179 // right spot.
2180
2181 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2182 // if kernel honors the hint then we can return immediately.
2183 char * addr = anon_mmap(requested_addr, bytes, false/*fixed*/, false/*executable*/);
2184 if (addr == requested_addr) {
2185 return requested_addr;
2186 }
2187
2188 if (addr != NULL) {
2189 // mmap() is successful but it fails to reserve at the requested address
2190 anon_munmap(addr, bytes);
2191 }
2192
2193 return NULL;
2194 }
2195
2196 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2197 void os::infinite_sleep() {
2198 while (true) { // sleep forever ...
2199 ::sleep(100); // ... 100 seconds at a time
2200 }
2201 }
2202
2203 // Used to convert frequent JVM_Yield() to nops
2204 bool os::dont_yield() {
2205 return DontYieldALot;
2206 }
2207
2208 void os::naked_yield() {
2209 sched_yield();
2210 }
2211
2212 ////////////////////////////////////////////////////////////////////////////////
2213 // thread priority support
2214
2215 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2216 // only supports dynamic priority, static priority must be zero. For real-time
2217 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2218 // However, for large multi-threaded applications, SCHED_RR is not only slower
2219 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2220 // of 5 runs - Sep 2005).
2221 //
2222 // The following code actually changes the niceness of kernel-thread/LWP. It
2223 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2224 // not the entire user process, and user level threads are 1:1 mapped to kernel
2225 // threads. It has always been the case, but could change in the future. For
2226 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2227 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2228 // (e.g., root privilege or CAP_SYS_NICE capability).
2229
2230 #if !defined(__APPLE__)
2231 int os::java_to_os_priority[CriticalPriority + 1] = {
2232 19, // 0 Entry should never be used
2233
2234 0, // 1 MinPriority
2235 3, // 2
2236 6, // 3
2237
2238 10, // 4
2239 15, // 5 NormPriority
2240 18, // 6
2241
2242 21, // 7
2243 25, // 8
2244 28, // 9 NearMaxPriority
2245
2246 31, // 10 MaxPriority
2247
2248 31 // 11 CriticalPriority
2249 };
2250 #else
2251 // Using Mach high-level priority assignments
2252 int os::java_to_os_priority[CriticalPriority + 1] = {
2253 0, // 0 Entry should never be used (MINPRI_USER)
2254
2255 27, // 1 MinPriority
2256 28, // 2
2257 29, // 3
2258
2259 30, // 4
2260 31, // 5 NormPriority (BASEPRI_DEFAULT)
2261 32, // 6
2262
2263 33, // 7
2264 34, // 8
2265 35, // 9 NearMaxPriority
2266
2267 36, // 10 MaxPriority
2268
2269 36 // 11 CriticalPriority
2270 };
2271 #endif
2272
2273 static int prio_init() {
2274 if (ThreadPriorityPolicy == 1) {
2275 if (geteuid() != 0) {
2276 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) {
2277 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2278 "e.g., being the root user. If the necessary permission is not " \
2279 "possessed, changes to priority will be silently ignored.");
2280 }
2281 }
2282 }
2283 if (UseCriticalJavaThreadPriority) {
2284 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2285 }
2286 return 0;
2287 }
2288
2289 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2290 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2291
2292 #ifdef __OpenBSD__
2293 // OpenBSD pthread_setprio starves low priority threads
2294 return OS_OK;
2295 #elif defined(__FreeBSD__)
2296 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2297 return (ret == 0) ? OS_OK : OS_ERR;
2298 #elif defined(__APPLE__) || defined(__NetBSD__)
2299 struct sched_param sp;
2300 int policy;
2301
2302 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2303 return OS_ERR;
2304 }
2305
2306 sp.sched_priority = newpri;
2307 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2308 return OS_ERR;
2309 }
2310
2311 return OS_OK;
2312 #else
2313 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2314 return (ret == 0) ? OS_OK : OS_ERR;
2315 #endif
2316 }
2317
2318 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2319 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2320 *priority_ptr = java_to_os_priority[NormPriority];
2321 return OS_OK;
2322 }
2323
2324 errno = 0;
2325 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2326 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2327 #elif defined(__APPLE__) || defined(__NetBSD__)
2328 int policy;
2329 struct sched_param sp;
2330
2331 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2332 if (res != 0) {
2333 *priority_ptr = -1;
2334 return OS_ERR;
2335 } else {
2336 *priority_ptr = sp.sched_priority;
2337 return OS_OK;
2338 }
2339 #else
2340 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2341 #endif
2342 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2343 }
2344
2345 ////////////////////////////////////////////////////////////////////////////////
2346 // suspend/resume support
2347
2348 // The low-level signal-based suspend/resume support is a remnant from the
2349 // old VM-suspension that used to be for java-suspension, safepoints etc,
2350 // within hotspot. Currently used by JFR's OSThreadSampler
2351 //
2352 // The remaining code is greatly simplified from the more general suspension
2353 // code that used to be used.
2354 //
2355 // The protocol is quite simple:
2356 // - suspend:
2357 // - sends a signal to the target thread
2358 // - polls the suspend state of the osthread using a yield loop
2359 // - target thread signal handler (SR_handler) sets suspend state
2360 // and blocks in sigsuspend until continued
2361 // - resume:
2362 // - sets target osthread state to continue
2363 // - sends signal to end the sigsuspend loop in the SR_handler
2364 //
2365 // Note that the SR_lock plays no role in this suspend/resume protocol,
2366 // but is checked for NULL in SR_handler as a thread termination indicator.
2367 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2368 //
2369 // Note that resume_clear_context() and suspend_save_context() are needed
2370 // by SR_handler(), so that fetch_frame_from_context() works,
2371 // which in part is used by:
2372 // - Forte Analyzer: AsyncGetCallTrace()
2373 // - StackBanging: get_frame_at_stack_banging_point()
2374
2375 static void resume_clear_context(OSThread *osthread) {
2376 osthread->set_ucontext(NULL);
2377 osthread->set_siginfo(NULL);
2378 }
2379
2380 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2381 osthread->set_ucontext(context);
2382 osthread->set_siginfo(siginfo);
2383 }
2384
2385 // Handler function invoked when a thread's execution is suspended or
2386 // resumed. We have to be careful that only async-safe functions are
2387 // called here (Note: most pthread functions are not async safe and
2388 // should be avoided.)
2389 //
2390 // Note: sigwait() is a more natural fit than sigsuspend() from an
2391 // interface point of view, but sigwait() prevents the signal hander
2392 // from being run. libpthread would get very confused by not having
2393 // its signal handlers run and prevents sigwait()'s use with the
2394 // mutex granting granting signal.
2395 //
2396 // Currently only ever called on the VMThread or JavaThread
2397 //
2398 #ifdef __APPLE__
2399 static OSXSemaphore sr_semaphore;
2400 #else
2401 static PosixSemaphore sr_semaphore;
2402 #endif
2403
2404 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2405 // Save and restore errno to avoid confusing native code with EINTR
2406 // after sigsuspend.
2407 int old_errno = errno;
2408
2409 Thread* thread = Thread::current_or_null_safe();
2410 assert(thread != NULL, "Missing current thread in SR_handler");
2411
2412 // On some systems we have seen signal delivery get "stuck" until the signal
2413 // mask is changed as part of thread termination. Check that the current thread
2414 // has not already terminated (via SR_lock()) - else the following assertion
2415 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2416 // destructor has completed.
2417
2418 if (thread->SR_lock() == NULL) {
2419 return;
2420 }
2421
2422 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2423
2424 OSThread* osthread = thread->osthread();
2425
2426 os::SuspendResume::State current = osthread->sr.state();
2427 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2428 suspend_save_context(osthread, siginfo, context);
2429
2430 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2431 os::SuspendResume::State state = osthread->sr.suspended();
2432 if (state == os::SuspendResume::SR_SUSPENDED) {
2433 sigset_t suspend_set; // signals for sigsuspend()
2434
2435 // get current set of blocked signals and unblock resume signal
2436 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2437 sigdelset(&suspend_set, SR_signum);
2438
2439 sr_semaphore.signal();
2440 // wait here until we are resumed
2441 while (1) {
2442 sigsuspend(&suspend_set);
2443
2444 os::SuspendResume::State result = osthread->sr.running();
2445 if (result == os::SuspendResume::SR_RUNNING) {
2446 sr_semaphore.signal();
2447 break;
2448 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2449 ShouldNotReachHere();
2450 }
2451 }
2452
2453 } else if (state == os::SuspendResume::SR_RUNNING) {
2454 // request was cancelled, continue
2455 } else {
2456 ShouldNotReachHere();
2457 }
2458
2459 resume_clear_context(osthread);
2460 } else if (current == os::SuspendResume::SR_RUNNING) {
2461 // request was cancelled, continue
2462 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2463 // ignore
2464 } else {
2465 // ignore
2466 }
2467
2468 errno = old_errno;
2469 }
2470
2471
2472 static int SR_initialize() {
2473 struct sigaction act;
2474 char *s;
2475 // Get signal number to use for suspend/resume
2476 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2477 int sig = ::strtol(s, 0, 10);
2478 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2479 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2480 SR_signum = sig;
2481 } else {
2482 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2483 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2484 }
2485 }
2486
2487 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2488 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2489
2490 sigemptyset(&SR_sigset);
2491 sigaddset(&SR_sigset, SR_signum);
2492
2493 // Set up signal handler for suspend/resume
2494 act.sa_flags = SA_RESTART|SA_SIGINFO;
2495 act.sa_handler = (void (*)(int)) SR_handler;
2496
2497 // SR_signum is blocked by default.
2498 // 4528190 - We also need to block pthread restart signal (32 on all
2499 // supported Bsd platforms). Note that BsdThreads need to block
2500 // this signal for all threads to work properly. So we don't have
2501 // to use hard-coded signal number when setting up the mask.
2502 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2503
2504 if (sigaction(SR_signum, &act, 0) == -1) {
2505 return -1;
2506 }
2507
2508 // Save signal flag
2509 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2510 return 0;
2511 }
2512
2513 static int sr_notify(OSThread* osthread) {
2514 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2515 assert_status(status == 0, status, "pthread_kill");
2516 return status;
2517 }
2518
2519 // "Randomly" selected value for how long we want to spin
2520 // before bailing out on suspending a thread, also how often
2521 // we send a signal to a thread we want to resume
2522 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2523 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2524
2525 // returns true on success and false on error - really an error is fatal
2526 // but this seems the normal response to library errors
2527 static bool do_suspend(OSThread* osthread) {
2528 assert(osthread->sr.is_running(), "thread should be running");
2529 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2530
2531 // mark as suspended and send signal
2532 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2533 // failed to switch, state wasn't running?
2534 ShouldNotReachHere();
2535 return false;
2536 }
2537
2538 if (sr_notify(osthread) != 0) {
2539 ShouldNotReachHere();
2540 }
2541
2542 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2543 while (true) {
2544 if (sr_semaphore.timedwait(2)) {
2545 break;
2546 } else {
2547 // timeout
2548 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2549 if (cancelled == os::SuspendResume::SR_RUNNING) {
2550 return false;
2551 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2552 // make sure that we consume the signal on the semaphore as well
2553 sr_semaphore.wait();
2554 break;
2555 } else {
2556 ShouldNotReachHere();
2557 return false;
2558 }
2559 }
2560 }
2561
2562 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2563 return true;
2564 }
2565
2566 static void do_resume(OSThread* osthread) {
2567 assert(osthread->sr.is_suspended(), "thread should be suspended");
2568 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2569
2570 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2571 // failed to switch to WAKEUP_REQUEST
2572 ShouldNotReachHere();
2573 return;
2574 }
2575
2576 while (true) {
2577 if (sr_notify(osthread) == 0) {
2578 if (sr_semaphore.timedwait(2)) {
2579 if (osthread->sr.is_running()) {
2580 return;
2581 }
2582 }
2583 } else {
2584 ShouldNotReachHere();
2585 }
2586 }
2587
2588 guarantee(osthread->sr.is_running(), "Must be running!");
2589 }
2590
2591 ///////////////////////////////////////////////////////////////////////////////////
2592 // signal handling (except suspend/resume)
2593
2594 // This routine may be used by user applications as a "hook" to catch signals.
2595 // The user-defined signal handler must pass unrecognized signals to this
2596 // routine, and if it returns true (non-zero), then the signal handler must
2597 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2598 // routine will never retun false (zero), but instead will execute a VM panic
2599 // routine kill the process.
2600 //
2601 // If this routine returns false, it is OK to call it again. This allows
2602 // the user-defined signal handler to perform checks either before or after
2603 // the VM performs its own checks. Naturally, the user code would be making
2604 // a serious error if it tried to handle an exception (such as a null check
2605 // or breakpoint) that the VM was generating for its own correct operation.
2606 //
2607 // This routine may recognize any of the following kinds of signals:
2608 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2609 // It should be consulted by handlers for any of those signals.
2610 //
2611 // The caller of this routine must pass in the three arguments supplied
2612 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2613 // field of the structure passed to sigaction(). This routine assumes that
2614 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2615 //
2616 // Note that the VM will print warnings if it detects conflicting signal
2617 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2618 //
2619 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2620 void* ucontext,
2621 int abort_if_unrecognized);
2622
2623 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2624 assert(info != NULL && uc != NULL, "it must be old kernel");
2625 int orig_errno = errno; // Preserve errno value over signal handler.
2626 JVM_handle_bsd_signal(sig, info, uc, true);
2627 errno = orig_errno;
2628 }
2629
2630
2631 // This boolean allows users to forward their own non-matching signals
2632 // to JVM_handle_bsd_signal, harmlessly.
2633 bool os::Bsd::signal_handlers_are_installed = false;
2634
2635 // For signal-chaining
2636 bool os::Bsd::libjsig_is_loaded = false;
2637 typedef struct sigaction *(*get_signal_t)(int);
2638 get_signal_t os::Bsd::get_signal_action = NULL;
2639
2640 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2641 struct sigaction *actp = NULL;
2642
2643 if (libjsig_is_loaded) {
2644 // Retrieve the old signal handler from libjsig
2645 actp = (*get_signal_action)(sig);
2646 }
2647 if (actp == NULL) {
2648 // Retrieve the preinstalled signal handler from jvm
2649 actp = os::Posix::get_preinstalled_handler(sig);
2650 }
2651
2652 return actp;
2653 }
2654
2655 static bool call_chained_handler(struct sigaction *actp, int sig,
2656 siginfo_t *siginfo, void *context) {
2657 // Call the old signal handler
2658 if (actp->sa_handler == SIG_DFL) {
2659 // It's more reasonable to let jvm treat it as an unexpected exception
2660 // instead of taking the default action.
2661 return false;
2662 } else if (actp->sa_handler != SIG_IGN) {
2663 if ((actp->sa_flags & SA_NODEFER) == 0) {
2664 // automaticlly block the signal
2665 sigaddset(&(actp->sa_mask), sig);
2666 }
2667
2668 sa_handler_t hand;
2669 sa_sigaction_t sa;
2670 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2671 // retrieve the chained handler
2672 if (siginfo_flag_set) {
2673 sa = actp->sa_sigaction;
2674 } else {
2675 hand = actp->sa_handler;
2676 }
2677
2678 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2679 actp->sa_handler = SIG_DFL;
2680 }
2681
2682 // try to honor the signal mask
2683 sigset_t oset;
2684 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2685
2686 // call into the chained handler
2687 if (siginfo_flag_set) {
2688 (*sa)(sig, siginfo, context);
2689 } else {
2690 (*hand)(sig);
2691 }
2692
2693 // restore the signal mask
2694 pthread_sigmask(SIG_SETMASK, &oset, 0);
2695 }
2696 // Tell jvm's signal handler the signal is taken care of.
2697 return true;
2698 }
2699
2700 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2701 bool chained = false;
2702 // signal-chaining
2703 if (UseSignalChaining) {
2704 struct sigaction *actp = get_chained_signal_action(sig);
2705 if (actp != NULL) {
2706 chained = call_chained_handler(actp, sig, siginfo, context);
2707 }
2708 }
2709 return chained;
2710 }
2711
2712 // for diagnostic
2713 int sigflags[NSIG];
2714
2715 int os::Bsd::get_our_sigflags(int sig) {
2716 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2717 return sigflags[sig];
2718 }
2719
2720 void os::Bsd::set_our_sigflags(int sig, int flags) {
2721 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2722 if (sig > 0 && sig < NSIG) {
2723 sigflags[sig] = flags;
2724 }
2725 }
2726
2727 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2728 // Check for overwrite.
2729 struct sigaction oldAct;
2730 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2731
2732 void* oldhand = oldAct.sa_sigaction
2733 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2734 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2735 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2736 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2737 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2738 if (AllowUserSignalHandlers || !set_installed) {
2739 // Do not overwrite; user takes responsibility to forward to us.
2740 return;
2741 } else if (UseSignalChaining) {
2742 // save the old handler in jvm
2743 os::Posix::save_preinstalled_handler(sig, oldAct);
2744 // libjsig also interposes the sigaction() call below and saves the
2745 // old sigaction on it own.
2746 } else {
2747 fatal("Encountered unexpected pre-existing sigaction handler "
2748 "%#lx for signal %d.", (long)oldhand, sig);
2749 }
2750 }
2751
2752 struct sigaction sigAct;
2753 sigfillset(&(sigAct.sa_mask));
2754 sigAct.sa_handler = SIG_DFL;
2755 if (!set_installed) {
2756 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2757 } else {
2758 sigAct.sa_sigaction = signalHandler;
2759 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2760 }
2761 #ifdef __APPLE__
2762 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2763 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2764 // if the signal handler declares it will handle it on alternate stack.
2765 // Notice we only declare we will handle it on alt stack, but we are not
2766 // actually going to use real alt stack - this is just a workaround.
2767 // Please see ux_exception.c, method catch_mach_exception_raise for details
2768 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2769 if (sig == SIGSEGV) {
2770 sigAct.sa_flags |= SA_ONSTACK;
2771 }
2772 #endif
2773
2774 // Save flags, which are set by ours
2775 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2776 sigflags[sig] = sigAct.sa_flags;
2777
2778 int ret = sigaction(sig, &sigAct, &oldAct);
2779 assert(ret == 0, "check");
2780
2781 void* oldhand2 = oldAct.sa_sigaction
2782 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2783 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2784 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2785 }
2786
2787 // install signal handlers for signals that HotSpot needs to
2788 // handle in order to support Java-level exception handling.
2789
2790 void os::Bsd::install_signal_handlers() {
2791 if (!signal_handlers_are_installed) {
2792 signal_handlers_are_installed = true;
2793
2794 // signal-chaining
2795 typedef void (*signal_setting_t)();
2796 signal_setting_t begin_signal_setting = NULL;
2797 signal_setting_t end_signal_setting = NULL;
2798 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2799 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2800 if (begin_signal_setting != NULL) {
2801 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2802 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2803 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2804 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2805 libjsig_is_loaded = true;
2806 assert(UseSignalChaining, "should enable signal-chaining");
2807 }
2808 if (libjsig_is_loaded) {
2809 // Tell libjsig jvm is setting signal handlers
2810 (*begin_signal_setting)();
2811 }
2812
2813 set_signal_handler(SIGSEGV, true);
2814 set_signal_handler(SIGPIPE, true);
2815 set_signal_handler(SIGBUS, true);
2816 set_signal_handler(SIGILL, true);
2817 set_signal_handler(SIGFPE, true);
2818 set_signal_handler(SIGXFSZ, true);
2819
2820 #if defined(__APPLE__)
2821 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2822 // signals caught and handled by the JVM. To work around this, we reset the mach task
2823 // signal handler that's placed on our process by CrashReporter. This disables
2824 // CrashReporter-based reporting.
2825 //
2826 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2827 // on caught fatal signals.
2828 //
2829 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2830 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2831 // exception handling, while leaving the standard BSD signal handlers functional.
2832 kern_return_t kr;
2833 kr = task_set_exception_ports(mach_task_self(),
2834 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2835 MACH_PORT_NULL,
2836 EXCEPTION_STATE_IDENTITY,
2837 MACHINE_THREAD_STATE);
2838
2839 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2840 #endif
2841
2842 if (libjsig_is_loaded) {
2843 // Tell libjsig jvm finishes setting signal handlers
2844 (*end_signal_setting)();
2845 }
2846
2847 // We don't activate signal checker if libjsig is in place, we trust ourselves
2848 // and if UserSignalHandler is installed all bets are off
2849 if (CheckJNICalls) {
2850 if (libjsig_is_loaded) {
2851 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
2852 check_signals = false;
2853 }
2854 if (AllowUserSignalHandlers) {
2855 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2856 check_signals = false;
2857 }
2858 }
2859 }
2860 }
2861
2862
2863 /////
2864 // glibc on Bsd platform uses non-documented flag
2865 // to indicate, that some special sort of signal
2866 // trampoline is used.
2867 // We will never set this flag, and we should
2868 // ignore this flag in our diagnostic
2869 #ifdef SIGNIFICANT_SIGNAL_MASK
2870 #undef SIGNIFICANT_SIGNAL_MASK
2871 #endif
2872 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2873
2874 static const char* get_signal_handler_name(address handler,
2875 char* buf, int buflen) {
2876 int offset;
2877 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2878 if (found) {
2879 // skip directory names
2880 const char *p1, *p2;
2881 p1 = buf;
2882 size_t len = strlen(os::file_separator());
2883 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2884 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2885 } else {
2886 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2887 }
2888 return buf;
2889 }
2890
2891 static void print_signal_handler(outputStream* st, int sig,
2892 char* buf, size_t buflen) {
2893 struct sigaction sa;
2894
2895 sigaction(sig, NULL, &sa);
2896
2897 // See comment for SIGNIFICANT_SIGNAL_MASK define
2898 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2899
2900 st->print("%s: ", os::exception_name(sig, buf, buflen));
2901
2902 address handler = (sa.sa_flags & SA_SIGINFO)
2903 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2904 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2905
2906 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2907 st->print("SIG_DFL");
2908 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2909 st->print("SIG_IGN");
2910 } else {
2911 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2912 }
2913
2914 st->print(", sa_mask[0]=");
2915 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2916
2917 address rh = VMError::get_resetted_sighandler(sig);
2918 // May be, handler was resetted by VMError?
2919 if (rh != NULL) {
2920 handler = rh;
2921 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2922 }
2923
2924 st->print(", sa_flags=");
2925 os::Posix::print_sa_flags(st, sa.sa_flags);
2926
2927 // Check: is it our handler?
2928 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2929 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2930 // It is our signal handler
2931 // check for flags, reset system-used one!
2932 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2933 st->print(
2934 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2935 os::Bsd::get_our_sigflags(sig));
2936 }
2937 }
2938 st->cr();
2939 }
2940
2941
2942 #define DO_SIGNAL_CHECK(sig) \
2943 do { \
2944 if (!sigismember(&check_signal_done, sig)) { \
2945 os::Bsd::check_signal_handler(sig); \
2946 } \
2947 } while (0)
2948
2949 // This method is a periodic task to check for misbehaving JNI applications
2950 // under CheckJNI, we can add any periodic checks here
2951
2952 void os::run_periodic_checks() {
2953
2954 if (check_signals == false) return;
2955
2956 // SEGV and BUS if overridden could potentially prevent
2957 // generation of hs*.log in the event of a crash, debugging
2958 // such a case can be very challenging, so we absolutely
2959 // check the following for a good measure:
2960 DO_SIGNAL_CHECK(SIGSEGV);
2961 DO_SIGNAL_CHECK(SIGILL);
2962 DO_SIGNAL_CHECK(SIGFPE);
2963 DO_SIGNAL_CHECK(SIGBUS);
2964 DO_SIGNAL_CHECK(SIGPIPE);
2965 DO_SIGNAL_CHECK(SIGXFSZ);
2966
2967
2968 // ReduceSignalUsage allows the user to override these handlers
2969 // see comments at the very top and jvm_md.h
2970 if (!ReduceSignalUsage) {
2971 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
2972 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
2973 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
2974 DO_SIGNAL_CHECK(BREAK_SIGNAL);
2975 }
2976
2977 DO_SIGNAL_CHECK(SR_signum);
2978 }
2979
2980 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
2981
2982 static os_sigaction_t os_sigaction = NULL;
2983
2984 void os::Bsd::check_signal_handler(int sig) {
2985 char buf[O_BUFLEN];
2986 address jvmHandler = NULL;
2987
2988
2989 struct sigaction act;
2990 if (os_sigaction == NULL) {
2991 // only trust the default sigaction, in case it has been interposed
2992 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
2993 if (os_sigaction == NULL) return;
2994 }
2995
2996 os_sigaction(sig, (struct sigaction*)NULL, &act);
2997
2998
2999 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3000
3001 address thisHandler = (act.sa_flags & SA_SIGINFO)
3002 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3003 : CAST_FROM_FN_PTR(address, act.sa_handler);
3004
3005
3006 switch (sig) {
3007 case SIGSEGV:
3008 case SIGBUS:
3009 case SIGFPE:
3010 case SIGPIPE:
3011 case SIGILL:
3012 case SIGXFSZ:
3013 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3014 break;
3015
3016 case SHUTDOWN1_SIGNAL:
3017 case SHUTDOWN2_SIGNAL:
3018 case SHUTDOWN3_SIGNAL:
3019 case BREAK_SIGNAL:
3020 jvmHandler = (address)user_handler();
3021 break;
3022
3023 default:
3024 if (sig == SR_signum) {
3025 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3026 } else {
3027 return;
3028 }
3029 break;
3030 }
3031
3032 if (thisHandler != jvmHandler) {
3033 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3034 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3035 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3036 // No need to check this sig any longer
3037 sigaddset(&check_signal_done, sig);
3038 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3039 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3040 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3041 exception_name(sig, buf, O_BUFLEN));
3042 }
3043 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3044 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3045 tty->print("expected:");
3046 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3047 tty->cr();
3048 tty->print(" found:");
3049 os::Posix::print_sa_flags(tty, act.sa_flags);
3050 tty->cr();
3051 // No need to check this sig any longer
3052 sigaddset(&check_signal_done, sig);
3053 }
3054
3055 // Dump all the signal
3056 if (sigismember(&check_signal_done, sig)) {
3057 print_signal_handlers(tty, buf, O_BUFLEN);
3058 }
3059 }
3060
3061 extern void report_error(char* file_name, int line_no, char* title,
3062 char* format, ...);
3063
3064 // this is called _before_ the most of global arguments have been parsed
3065 void os::init(void) {
3066 char dummy; // used to get a guess on initial stack address
3067
3068 clock_tics_per_sec = CLK_TCK;
3069
3070 init_random(1234567);
3071
3072 Bsd::set_page_size(getpagesize());
3073 if (Bsd::page_size() == -1) {
3074 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3075 }
3076 init_page_sizes((size_t) Bsd::page_size());
3077
3078 Bsd::initialize_system_info();
3079
3080 // _main_thread points to the thread that created/loaded the JVM.
3081 Bsd::_main_thread = pthread_self();
3082
3083 Bsd::clock_init();
3084 initial_time_count = javaTimeNanos();
3085
3086 os::Posix::init();
3087 }
3088
3089 // To install functions for atexit system call
3090 extern "C" {
3091 static void perfMemory_exit_helper() {
3092 perfMemory_exit();
3093 }
3094 }
3095
3096 // this is called _after_ the global arguments have been parsed
3097 jint os::init_2(void) {
3098
3099 // This could be set after os::Posix::init() but all platforms
3100 // have to set it the same so we have to mirror Solaris.
3101 DEBUG_ONLY(os::set_mutex_init_done();)
3102
3103 os::Posix::init_2();
3104
3105 // initialize suspend/resume support - must do this before signal_sets_init()
3106 if (SR_initialize() != 0) {
3107 perror("SR_initialize failed");
3108 return JNI_ERR;
3109 }
3110
3111 Bsd::signal_sets_init();
3112 Bsd::install_signal_handlers();
3113 // Initialize data for jdk.internal.misc.Signal
3114 if (!ReduceSignalUsage) {
3115 jdk_misc_signal_init();
3116 }
3117
3118 // Check and sets minimum stack sizes against command line options
3119 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3120 return JNI_ERR;
3121 }
3122
3123 // Not supported.
3124 FLAG_SET_ERGO(UseNUMA, false);
3125 FLAG_SET_ERGO(UseNUMAInterleaving, false);
3126
3127 if (MaxFDLimit) {
3128 // set the number of file descriptors to max. print out error
3129 // if getrlimit/setrlimit fails but continue regardless.
3130 struct rlimit nbr_files;
3131 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3132 if (status != 0) {
3133 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3134 } else {
3135 nbr_files.rlim_cur = nbr_files.rlim_max;
3136
3137 #ifdef __APPLE__
3138 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3139 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3140 // be used instead
3141 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3142 #endif
3143
3144 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3145 if (status != 0) {
3146 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3147 }
3148 }
3149 }
3150
3151 // at-exit methods are called in the reverse order of their registration.
3152 // atexit functions are called on return from main or as a result of a
3153 // call to exit(3C). There can be only 32 of these functions registered
3154 // and atexit() does not set errno.
3155
3156 if (PerfAllowAtExitRegistration) {
3157 // only register atexit functions if PerfAllowAtExitRegistration is set.
3158 // atexit functions can be delayed until process exit time, which
3159 // can be problematic for embedded VM situations. Embedded VMs should
3160 // call DestroyJavaVM() to assure that VM resources are released.
3161
3162 // note: perfMemory_exit_helper atexit function may be removed in
3163 // the future if the appropriate cleanup code can be added to the
3164 // VM_Exit VMOperation's doit method.
3165 if (atexit(perfMemory_exit_helper) != 0) {
3166 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3167 }
3168 }
3169
3170 // initialize thread priority policy
3171 prio_init();
3172
3173 #ifdef __APPLE__
3174 // dynamically link to objective c gc registration
3175 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3176 if (handleLibObjc != NULL) {
3177 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3178 }
3179 #endif
3180
3181 return JNI_OK;
3182 }
3183
3184 int os::active_processor_count() {
3185 // User has overridden the number of active processors
3186 if (ActiveProcessorCount > 0) {
3187 log_trace(os)("active_processor_count: "
3188 "active processor count set by user : %d",
3189 ActiveProcessorCount);
3190 return ActiveProcessorCount;
3191 }
3192
3193 return _processor_count;
3194 }
3195
3196 #ifdef __APPLE__
3197 uint os::processor_id() {
3198 // Get the initial APIC id and return the associated processor id. The initial APIC
3199 // id is limited to 8-bits, which means we can have at most 256 unique APIC ids. If
3200 // the system has more processors (or the initial APIC ids are discontiguous) the
3201 // APIC id will be truncated and more than one processor will potentially share the
3202 // same processor id. This is not optimal, but unlikely to happen in practice. Should
3203 // this become a real problem we could switch to using x2APIC ids, which are 32-bit
3204 // wide. However, note that x2APIC is Intel-specific, and the wider number space
3205 // would require a more complicated mapping approach.
3206 uint eax = 0x1;
3207 uint ebx;
3208 uint ecx = 0;
3209 uint edx;
3210
3211 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3212
3213 uint apic_id = (ebx >> 24) & (processor_id_map_size - 1);
3214 int processor_id = Atomic::load(&processor_id_map[apic_id]);
3215
3216 while (processor_id < 0) {
3217 // Assign processor id to APIC id
3218 processor_id = Atomic::cmpxchg(&processor_id_map[apic_id], processor_id_unassigned, processor_id_assigning);
3219 if (processor_id == processor_id_unassigned) {
3220 processor_id = Atomic::fetch_and_add(&processor_id_next, 1) % os::processor_count();
3221 Atomic::store(&processor_id_map[apic_id], processor_id);
3222 }
3223 }
3224
3225 assert(processor_id >= 0 && processor_id < os::processor_count(), "invalid processor id");
3226
3227 return (uint)processor_id;
3228 }
3229 #endif
3230
3231 void os::set_native_thread_name(const char *name) {
3232 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3233 // This is only supported in Snow Leopard and beyond
3234 if (name != NULL) {
3235 // Add a "Java: " prefix to the name
3236 char buf[MAXTHREADNAMESIZE];
3237 snprintf(buf, sizeof(buf), "Java: %s", name);
3238 pthread_setname_np(buf);
3239 }
3240 #endif
3241 }
3242
3243 bool os::bind_to_processor(uint processor_id) {
3244 // Not yet implemented.
3245 return false;
3246 }
3247
3248 void os::SuspendedThreadTask::internal_do_task() {
3249 if (do_suspend(_thread->osthread())) {
3250 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3251 do_task(context);
3252 do_resume(_thread->osthread());
3253 }
3254 }
3255
3256 ////////////////////////////////////////////////////////////////////////////////
3257 // debug support
3258
3259 bool os::find(address addr, outputStream* st) {
3260 Dl_info dlinfo;
3261 memset(&dlinfo, 0, sizeof(dlinfo));
3262 if (dladdr(addr, &dlinfo) != 0) {
3263 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3264 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3265 st->print("%s+%#x", dlinfo.dli_sname,
3266 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3267 } else if (dlinfo.dli_fbase != NULL) {
3268 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3269 } else {
3270 st->print("<absolute address>");
3271 }
3272 if (dlinfo.dli_fname != NULL) {
3273 st->print(" in %s", dlinfo.dli_fname);
3274 }
3275 if (dlinfo.dli_fbase != NULL) {
3276 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3277 }
3278 st->cr();
3279
3280 if (Verbose) {
3281 // decode some bytes around the PC
3282 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3283 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3284 address lowest = (address) dlinfo.dli_sname;
3285 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3286 if (begin < lowest) begin = lowest;
3287 Dl_info dlinfo2;
3288 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3289 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3290 end = (address) dlinfo2.dli_saddr;
3291 }
3292 Disassembler::decode(begin, end, st);
3293 }
3294 return true;
3295 }
3296 return false;
3297 }
3298
3299 ////////////////////////////////////////////////////////////////////////////////
3300 // misc
3301
3302 // This does not do anything on Bsd. This is basically a hook for being
3303 // able to use structured exception handling (thread-local exception filters)
3304 // on, e.g., Win32.
3305 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3306 const methodHandle& method, JavaCallArguments* args,
3307 Thread* thread) {
3308 f(value, method, args, thread);
3309 }
3310
3311 void os::print_statistics() {
3312 }
3313
3314 bool os::message_box(const char* title, const char* message) {
3315 int i;
3316 fdStream err(defaultStream::error_fd());
3317 for (i = 0; i < 78; i++) err.print_raw("=");
3318 err.cr();
3319 err.print_raw_cr(title);
3320 for (i = 0; i < 78; i++) err.print_raw("-");
3321 err.cr();
3322 err.print_raw_cr(message);
3323 for (i = 0; i < 78; i++) err.print_raw("=");
3324 err.cr();
3325
3326 char buf[16];
3327 // Prevent process from exiting upon "read error" without consuming all CPU
3328 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3329
3330 return buf[0] == 'y' || buf[0] == 'Y';
3331 }
3332
3333 static inline struct timespec get_mtime(const char* filename) {
3334 struct stat st;
3335 int ret = os::stat(filename, &st);
3336 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3337 #ifdef __APPLE__
3338 return st.st_mtimespec;
3339 #else
3340 return st.st_mtim;
3341 #endif
3342 }
3343
3344 int os::compare_file_modified_times(const char* file1, const char* file2) {
3345 struct timespec filetime1 = get_mtime(file1);
3346 struct timespec filetime2 = get_mtime(file2);
3347 int diff = filetime1.tv_sec - filetime2.tv_sec;
3348 if (diff == 0) {
3349 return filetime1.tv_nsec - filetime2.tv_nsec;
3350 }
3351 return diff;
3352 }
3353
3354 // Is a (classpath) directory empty?
3355 bool os::dir_is_empty(const char* path) {
3356 DIR *dir = NULL;
3357 struct dirent *ptr;
3358
3359 dir = opendir(path);
3360 if (dir == NULL) return true;
3361
3362 // Scan the directory
3363 bool result = true;
3364 while (result && (ptr = readdir(dir)) != NULL) {
3365 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3366 result = false;
3367 }
3368 }
3369 closedir(dir);
3370 return result;
3371 }
3372
3373 // This code originates from JDK's sysOpen and open64_w
3374 // from src/solaris/hpi/src/system_md.c
3375
3376 int os::open(const char *path, int oflag, int mode) {
3377 if (strlen(path) > MAX_PATH - 1) {
3378 errno = ENAMETOOLONG;
3379 return -1;
3380 }
3381 int fd;
3382
3383 fd = ::open(path, oflag, mode);
3384 if (fd == -1) return -1;
3385
3386 // If the open succeeded, the file might still be a directory
3387 {
3388 struct stat buf;
3389 int ret = ::fstat(fd, &buf);
3390 int st_mode = buf.st_mode;
3391
3392 if (ret != -1) {
3393 if ((st_mode & S_IFMT) == S_IFDIR) {
3394 errno = EISDIR;
3395 ::close(fd);
3396 return -1;
3397 }
3398 } else {
3399 ::close(fd);
3400 return -1;
3401 }
3402 }
3403
3404 // All file descriptors that are opened in the JVM and not
3405 // specifically destined for a subprocess should have the
3406 // close-on-exec flag set. If we don't set it, then careless 3rd
3407 // party native code might fork and exec without closing all
3408 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3409 // UNIXProcess.c), and this in turn might:
3410 //
3411 // - cause end-of-file to fail to be detected on some file
3412 // descriptors, resulting in mysterious hangs, or
3413 //
3414 // - might cause an fopen in the subprocess to fail on a system
3415 // suffering from bug 1085341.
3416 //
3417 // (Yes, the default setting of the close-on-exec flag is a Unix
3418 // design flaw)
3419 //
3420 // See:
3421 // 1085341: 32-bit stdio routines should support file descriptors >255
3422 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3423 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3424 //
3425 #ifdef FD_CLOEXEC
3426 {
3427 int flags = ::fcntl(fd, F_GETFD);
3428 if (flags != -1) {
3429 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3430 }
3431 }
3432 #endif
3433
3434 return fd;
3435 }
3436
3437
3438 // create binary file, rewriting existing file if required
3439 int os::create_binary_file(const char* path, bool rewrite_existing) {
3440 int oflags = O_WRONLY | O_CREAT;
3441 if (!rewrite_existing) {
3442 oflags |= O_EXCL;
3443 }
3444 return ::open(path, oflags, S_IREAD | S_IWRITE);
3445 }
3446
3447 // return current position of file pointer
3448 jlong os::current_file_offset(int fd) {
3449 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3450 }
3451
3452 // move file pointer to the specified offset
3453 jlong os::seek_to_file_offset(int fd, jlong offset) {
3454 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3455 }
3456
3457 // This code originates from JDK's sysAvailable
3458 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3459
3460 int os::available(int fd, jlong *bytes) {
3461 jlong cur, end;
3462 int mode;
3463 struct stat buf;
3464
3465 if (::fstat(fd, &buf) >= 0) {
3466 mode = buf.st_mode;
3467 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3468 int n;
3469 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3470 *bytes = n;
3471 return 1;
3472 }
3473 }
3474 }
3475 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3476 return 0;
3477 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3478 return 0;
3479 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3480 return 0;
3481 }
3482 *bytes = end - cur;
3483 return 1;
3484 }
3485
3486 // Map a block of memory.
3487 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3488 char *addr, size_t bytes, bool read_only,
3489 bool allow_exec) {
3490 int prot;
3491 int flags;
3492
3493 if (read_only) {
3494 prot = PROT_READ;
3495 flags = MAP_SHARED;
3496 } else {
3497 prot = PROT_READ | PROT_WRITE;
3498 flags = MAP_PRIVATE;
3499 }
3500
3501 if (allow_exec) {
3502 prot |= PROT_EXEC;
3503 }
3504
3505 if (addr != NULL) {
3506 flags |= MAP_FIXED;
3507 }
3508
3509 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3510 fd, file_offset);
3511 if (mapped_address == MAP_FAILED) {
3512 return NULL;
3513 }
3514 return mapped_address;
3515 }
3516
3517
3518 // Remap a block of memory.
3519 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3520 char *addr, size_t bytes, bool read_only,
3521 bool allow_exec) {
3522 // same as map_memory() on this OS
3523 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3524 allow_exec);
3525 }
3526
3527
3528 // Unmap a block of memory.
3529 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3530 return munmap(addr, bytes) == 0;
3531 }
3532
3533 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3534 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3535 // of a thread.
3536 //
3537 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3538 // the fast estimate available on the platform.
3539
3540 jlong os::current_thread_cpu_time() {
3541 #ifdef __APPLE__
3542 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3543 #else
3544 Unimplemented();
3545 return 0;
3546 #endif
3547 }
3548
3549 jlong os::thread_cpu_time(Thread* thread) {
3550 #ifdef __APPLE__
3551 return os::thread_cpu_time(thread, true /* user + sys */);
3552 #else
3553 Unimplemented();
3554 return 0;
3555 #endif
3556 }
3557
3558 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3559 #ifdef __APPLE__
3560 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3561 #else
3562 Unimplemented();
3563 return 0;
3564 #endif
3565 }
3566
3567 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3568 #ifdef __APPLE__
3569 struct thread_basic_info tinfo;
3570 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3571 kern_return_t kr;
3572 thread_t mach_thread;
3573
3574 mach_thread = thread->osthread()->thread_id();
3575 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3576 if (kr != KERN_SUCCESS) {
3577 return -1;
3578 }
3579
3580 if (user_sys_cpu_time) {
3581 jlong nanos;
3582 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3583 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3584 return nanos;
3585 } else {
3586 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3587 }
3588 #else
3589 Unimplemented();
3590 return 0;
3591 #endif
3592 }
3593
3594
3595 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3596 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3597 info_ptr->may_skip_backward = false; // elapsed time not wall time
3598 info_ptr->may_skip_forward = false; // elapsed time not wall time
3599 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3600 }
3601
3602 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3603 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3604 info_ptr->may_skip_backward = false; // elapsed time not wall time
3605 info_ptr->may_skip_forward = false; // elapsed time not wall time
3606 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3607 }
3608
3609 bool os::is_thread_cpu_time_supported() {
3610 #ifdef __APPLE__
3611 return true;
3612 #else
3613 return false;
3614 #endif
3615 }
3616
3617 // System loadavg support. Returns -1 if load average cannot be obtained.
3618 // Bsd doesn't yet have a (official) notion of processor sets,
3619 // so just return the system wide load average.
3620 int os::loadavg(double loadavg[], int nelem) {
3621 return ::getloadavg(loadavg, nelem);
3622 }
3623
3624 void os::pause() {
3625 char filename[MAX_PATH];
3626 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3627 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
3628 } else {
3629 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3630 }
3631
3632 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3633 if (fd != -1) {
3634 struct stat buf;
3635 ::close(fd);
3636 while (::stat(filename, &buf) == 0) {
3637 (void)::poll(NULL, 0, 100);
3638 }
3639 } else {
3640 jio_fprintf(stderr,
3641 "Could not open pause file '%s', continuing immediately.\n", filename);
3642 }
3643 }
3644
3645 // Darwin has no "environ" in a dynamic library.
3646 #ifdef __APPLE__
3647 #include <crt_externs.h>
3648 #define environ (*_NSGetEnviron())
3649 #else
3650 extern char** environ;
3651 #endif
3652
3653 // Run the specified command in a separate process. Return its exit value,
3654 // or -1 on failure (e.g. can't fork a new process).
3655 // Unlike system(), this function can be called from signal handler. It
3656 // doesn't block SIGINT et al.
3657 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3658 const char * argv[4] = {"sh", "-c", cmd, NULL};
3659
3660 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3661 // pthread_atfork handlers and reset pthread library. All we need is a
3662 // separate process to execve. Make a direct syscall to fork process.
3663 // On IA64 there's no fork syscall, we have to use fork() and hope for
3664 // the best...
3665 pid_t pid = fork();
3666
3667 if (pid < 0) {
3668 // fork failed
3669 return -1;
3670
3671 } else if (pid == 0) {
3672 // child process
3673
3674 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3675 // first to kill every thread on the thread list. Because this list is
3676 // not reset by fork() (see notes above), execve() will instead kill
3677 // every thread in the parent process. We know this is the only thread
3678 // in the new process, so make a system call directly.
3679 // IA64 should use normal execve() from glibc to match the glibc fork()
3680 // above.
3681 execve("/bin/sh", (char* const*)argv, environ);
3682
3683 // execve failed
3684 _exit(-1);
3685
3686 } else {
3687 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3688 // care about the actual exit code, for now.
3689
3690 int status;
3691
3692 // Wait for the child process to exit. This returns immediately if
3693 // the child has already exited. */
3694 while (waitpid(pid, &status, 0) < 0) {
3695 switch (errno) {
3696 case ECHILD: return 0;
3697 case EINTR: break;
3698 default: return -1;
3699 }
3700 }
3701
3702 if (WIFEXITED(status)) {
3703 // The child exited normally; get its exit code.
3704 return WEXITSTATUS(status);
3705 } else if (WIFSIGNALED(status)) {
3706 // The child exited because of a signal
3707 // The best value to return is 0x80 + signal number,
3708 // because that is what all Unix shells do, and because
3709 // it allows callers to distinguish between process exit and
3710 // process death by signal.
3711 return 0x80 + WTERMSIG(status);
3712 } else {
3713 // Unknown exit code; pass it through
3714 return status;
3715 }
3716 }
3717 }
3718
3719 // Get the kern.corefile setting, or otherwise the default path to the core file
3720 // Returns the length of the string
3721 int os::get_core_path(char* buffer, size_t bufferSize) {
3722 int n = 0;
3723 #ifdef __APPLE__
3724 char coreinfo[MAX_PATH];
3725 size_t sz = sizeof(coreinfo);
3726 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0);
3727 if (ret == 0) {
3728 char *pid_pos = strstr(coreinfo, "%P");
3729 // skip over the "%P" to preserve any optional custom user pattern
3730 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : "";
3731
3732 if (pid_pos != NULL) {
3733 *pid_pos = '\0';
3734 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail);
3735 } else {
3736 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo);
3737 }
3738 } else
3739 #endif
3740 {
3741 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id());
3742 }
3743 // Truncate if theoretical string was longer than bufferSize
3744 n = MIN2(n, (int)bufferSize);
3745
3746 return n;
3747 }
3748
3749 bool os::supports_map_sync() {
3750 return false;
3751 }
3752
3753 #ifndef PRODUCT
3754 void TestReserveMemorySpecial_test() {
3755 // No tests available for this platform
3756 }
3757 #endif
3758
3759 bool os::start_debugging(char *buf, int buflen) {
3760 int len = (int)strlen(buf);
3761 char *p = &buf[len];
3762
3763 jio_snprintf(p, buflen-len,
3764 "\n\n"
3765 "Do you want to debug the problem?\n\n"
3766 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3767 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3768 "Otherwise, press RETURN to abort...",
3769 os::current_process_id(), os::current_process_id(),
3770 os::current_thread_id(), os::current_thread_id());
3771
3772 bool yes = os::message_box("Unexpected Error", buf);
3773
3774 if (yes) {
3775 // yes, user asked VM to launch debugger
3776 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3777 os::current_process_id(), os::current_process_id());
3778
3779 os::fork_and_exec(buf);
3780 yes = false;
3781 }
3782 return yes;
3783 }