1 /*
2 * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_bsd.inline.hpp"
41 #include "os_posix.inline.hpp"
42 #include "os_share_bsd.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/semaphore.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/vmError.hpp"
72
73 // put OS-includes here
74 # include <dlfcn.h>
75 # include <errno.h>
76 # include <fcntl.h>
77 # include <inttypes.h>
78 # include <poll.h>
79 # include <pthread.h>
80 # include <pwd.h>
81 # include <signal.h>
82 # include <stdint.h>
83 # include <stdio.h>
84 # include <string.h>
85 # include <sys/ioctl.h>
86 # include <sys/mman.h>
87 # include <sys/param.h>
88 # include <sys/resource.h>
89 # include <sys/socket.h>
90 # include <sys/stat.h>
91 # include <sys/syscall.h>
92 # include <sys/sysctl.h>
93 # include <sys/time.h>
94 # include <sys/times.h>
95 # include <sys/types.h>
96 # include <sys/wait.h>
97 # include <time.h>
98 # include <unistd.h>
99
100 #if defined(__FreeBSD__) || defined(__NetBSD__)
101 #include <elf.h>
102 #endif
103
104 #ifdef __APPLE__
105 #include <mach-o/dyld.h>
106 #endif
107
108 #ifndef MAP_ANONYMOUS
109 #define MAP_ANONYMOUS MAP_ANON
110 #endif
111
112 #define MAX_PATH (2 * K)
113
114 // for timer info max values which include all bits
115 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
116
117 ////////////////////////////////////////////////////////////////////////////////
118 // global variables
119 julong os::Bsd::_physical_memory = 0;
120
121 #ifdef __APPLE__
122 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
123 volatile uint64_t os::Bsd::_max_abstime = 0;
124 #else
125 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
126 #endif
127 pthread_t os::Bsd::_main_thread;
128 int os::Bsd::_page_size = -1;
129
130 static jlong initial_time_count=0;
131
132 static int clock_tics_per_sec = 100;
133
134 // For diagnostics to print a message once. see run_periodic_checks
135 static sigset_t check_signal_done;
136 static bool check_signals = true;
137
138 // Signal number used to suspend/resume a thread
139
140 // do not use any signal number less than SIGSEGV, see 4355769
141 static int SR_signum = SIGUSR2;
142 sigset_t SR_sigset;
143
144 #ifdef __APPLE__
145 static const int processor_id_unassigned = -1;
146 static const int processor_id_assigning = -2;
147 static const int processor_id_map_size = 256;
148 static volatile int processor_id_map[processor_id_map_size];
149 static volatile int processor_id_next = 0;
150 #endif
151
152 ////////////////////////////////////////////////////////////////////////////////
153 // utility functions
154
155 static int SR_initialize();
156
157 julong os::available_memory() {
158 return Bsd::available_memory();
159 }
160
161 // available here means free
162 julong os::Bsd::available_memory() {
163 uint64_t available = physical_memory() >> 2;
164 #ifdef __APPLE__
165 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
166 vm_statistics64_data_t vmstat;
167 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
168 (host_info64_t)&vmstat, &count);
169 assert(kerr == KERN_SUCCESS,
170 "host_statistics64 failed - check mach_host_self() and count");
171 if (kerr == KERN_SUCCESS) {
172 available = vmstat.free_count * os::vm_page_size();
173 }
174 #endif
175 return available;
176 }
177
178 // for more info see :
179 // https://man.openbsd.org/sysctl.2
180 void os::Bsd::print_uptime_info(outputStream* st) {
181 struct timeval boottime;
182 size_t len = sizeof(boottime);
183 int mib[2];
184 mib[0] = CTL_KERN;
185 mib[1] = KERN_BOOTTIME;
186
187 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
188 time_t bootsec = boottime.tv_sec;
189 time_t currsec = time(NULL);
190 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
191 }
192 }
193
194 julong os::physical_memory() {
195 return Bsd::physical_memory();
196 }
197
198 // Return true if user is running as root.
199
200 bool os::have_special_privileges() {
201 static bool init = false;
202 static bool privileges = false;
203 if (!init) {
204 privileges = (getuid() != geteuid()) || (getgid() != getegid());
205 init = true;
206 }
207 return privileges;
208 }
209
210
211
212 // Cpu architecture string
213 #if defined(ZERO)
214 static char cpu_arch[] = ZERO_LIBARCH;
215 #elif defined(IA64)
216 static char cpu_arch[] = "ia64";
217 #elif defined(IA32)
218 static char cpu_arch[] = "i386";
219 #elif defined(AMD64)
220 static char cpu_arch[] = "amd64";
221 #elif defined(ARM)
222 static char cpu_arch[] = "arm";
223 #elif defined(PPC32)
224 static char cpu_arch[] = "ppc";
225 #else
226 #error Add appropriate cpu_arch setting
227 #endif
228
229 // Compiler variant
230 #ifdef COMPILER2
231 #define COMPILER_VARIANT "server"
232 #else
233 #define COMPILER_VARIANT "client"
234 #endif
235
236
237 void os::Bsd::initialize_system_info() {
238 int mib[2];
239 size_t len;
240 int cpu_val;
241 julong mem_val;
242
243 // get processors count via hw.ncpus sysctl
244 mib[0] = CTL_HW;
245 mib[1] = HW_NCPU;
246 len = sizeof(cpu_val);
247 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
248 assert(len == sizeof(cpu_val), "unexpected data size");
249 set_processor_count(cpu_val);
250 } else {
251 set_processor_count(1); // fallback
252 }
253
254 #ifdef __APPLE__
255 // initialize processor id map
256 for (int i = 0; i < processor_id_map_size; i++) {
257 processor_id_map[i] = processor_id_unassigned;
258 }
259 #endif
260
261 // get physical memory via hw.memsize sysctl (hw.memsize is used
262 // since it returns a 64 bit value)
263 mib[0] = CTL_HW;
264
265 #if defined (HW_MEMSIZE) // Apple
266 mib[1] = HW_MEMSIZE;
267 #elif defined(HW_PHYSMEM) // Most of BSD
268 mib[1] = HW_PHYSMEM;
269 #elif defined(HW_REALMEM) // Old FreeBSD
270 mib[1] = HW_REALMEM;
271 #else
272 #error No ways to get physmem
273 #endif
274
275 len = sizeof(mem_val);
276 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
277 assert(len == sizeof(mem_val), "unexpected data size");
278 _physical_memory = mem_val;
279 } else {
280 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
281 }
282
283 #ifdef __OpenBSD__
284 {
285 // limit _physical_memory memory view on OpenBSD since
286 // datasize rlimit restricts us anyway.
287 struct rlimit limits;
288 getrlimit(RLIMIT_DATA, &limits);
289 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
290 }
291 #endif
292 }
293
294 #ifdef __APPLE__
295 static const char *get_home() {
296 const char *home_dir = ::getenv("HOME");
297 if ((home_dir == NULL) || (*home_dir == '\0')) {
298 struct passwd *passwd_info = getpwuid(geteuid());
299 if (passwd_info != NULL) {
300 home_dir = passwd_info->pw_dir;
301 }
302 }
303
304 return home_dir;
305 }
306 #endif
307
308 void os::init_system_properties_values() {
309 // The next steps are taken in the product version:
310 //
311 // Obtain the JAVA_HOME value from the location of libjvm.so.
312 // This library should be located at:
313 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
314 //
315 // If "/jre/lib/" appears at the right place in the path, then we
316 // assume libjvm.so is installed in a JDK and we use this path.
317 //
318 // Otherwise exit with message: "Could not create the Java virtual machine."
319 //
320 // The following extra steps are taken in the debugging version:
321 //
322 // If "/jre/lib/" does NOT appear at the right place in the path
323 // instead of exit check for $JAVA_HOME environment variable.
324 //
325 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
326 // then we append a fake suffix "hotspot/libjvm.so" to this path so
327 // it looks like libjvm.so is installed there
328 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
329 //
330 // Otherwise exit.
331 //
332 // Important note: if the location of libjvm.so changes this
333 // code needs to be changed accordingly.
334
335 // See ld(1):
336 // The linker uses the following search paths to locate required
337 // shared libraries:
338 // 1: ...
339 // ...
340 // 7: The default directories, normally /lib and /usr/lib.
341 #ifndef DEFAULT_LIBPATH
342 #ifndef OVERRIDE_LIBPATH
343 #define DEFAULT_LIBPATH "/lib:/usr/lib"
344 #else
345 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
346 #endif
347 #endif
348
349 // Base path of extensions installed on the system.
350 #define SYS_EXT_DIR "/usr/java/packages"
351 #define EXTENSIONS_DIR "/lib/ext"
352
353 #ifndef __APPLE__
354
355 // Buffer that fits several sprintfs.
356 // Note that the space for the colon and the trailing null are provided
357 // by the nulls included by the sizeof operator.
358 const size_t bufsize =
359 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
360 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
361 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
362
363 // sysclasspath, java_home, dll_dir
364 {
365 char *pslash;
366 os::jvm_path(buf, bufsize);
367
368 // Found the full path to libjvm.so.
369 // Now cut the path to <java_home>/jre if we can.
370 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
371 pslash = strrchr(buf, '/');
372 if (pslash != NULL) {
373 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
374 }
375 Arguments::set_dll_dir(buf);
376
377 if (pslash != NULL) {
378 pslash = strrchr(buf, '/');
379 if (pslash != NULL) {
380 *pslash = '\0'; // Get rid of /<arch>.
381 pslash = strrchr(buf, '/');
382 if (pslash != NULL) {
383 *pslash = '\0'; // Get rid of /lib.
384 }
385 }
386 }
387 Arguments::set_java_home(buf);
388 if (!set_boot_path('/', ':')) {
389 vm_exit_during_initialization("Failed setting boot class path.", NULL);
390 }
391 }
392
393 // Where to look for native libraries.
394 //
395 // Note: Due to a legacy implementation, most of the library path
396 // is set in the launcher. This was to accomodate linking restrictions
397 // on legacy Bsd implementations (which are no longer supported).
398 // Eventually, all the library path setting will be done here.
399 //
400 // However, to prevent the proliferation of improperly built native
401 // libraries, the new path component /usr/java/packages is added here.
402 // Eventually, all the library path setting will be done here.
403 {
404 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
405 // should always exist (until the legacy problem cited above is
406 // addressed).
407 const char *v = ::getenv("LD_LIBRARY_PATH");
408 const char *v_colon = ":";
409 if (v == NULL) { v = ""; v_colon = ""; }
410 // That's +1 for the colon and +1 for the trailing '\0'.
411 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
412 strlen(v) + 1 +
413 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
414 mtInternal);
415 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
416 Arguments::set_library_path(ld_library_path);
417 FREE_C_HEAP_ARRAY(char, ld_library_path);
418 }
419
420 // Extensions directories.
421 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
422 Arguments::set_ext_dirs(buf);
423
424 FREE_C_HEAP_ARRAY(char, buf);
425
426 #else // __APPLE__
427
428 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
429 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
430
431 const char *user_home_dir = get_home();
432 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
433 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
434 sizeof(SYS_EXTENSIONS_DIRS);
435
436 // Buffer that fits several sprintfs.
437 // Note that the space for the colon and the trailing null are provided
438 // by the nulls included by the sizeof operator.
439 const size_t bufsize =
440 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
441 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
442 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
443
444 // sysclasspath, java_home, dll_dir
445 {
446 char *pslash;
447 os::jvm_path(buf, bufsize);
448
449 // Found the full path to libjvm.so.
450 // Now cut the path to <java_home>/jre if we can.
451 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
452 pslash = strrchr(buf, '/');
453 if (pslash != NULL) {
454 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
455 }
456 #ifdef STATIC_BUILD
457 strcat(buf, "/lib");
458 #endif
459
460 Arguments::set_dll_dir(buf);
461
462 if (pslash != NULL) {
463 pslash = strrchr(buf, '/');
464 if (pslash != NULL) {
465 *pslash = '\0'; // Get rid of /lib.
466 }
467 }
468 Arguments::set_java_home(buf);
469 set_boot_path('/', ':');
470 }
471
472 // Where to look for native libraries.
473 //
474 // Note: Due to a legacy implementation, most of the library path
475 // is set in the launcher. This was to accomodate linking restrictions
476 // on legacy Bsd implementations (which are no longer supported).
477 // Eventually, all the library path setting will be done here.
478 //
479 // However, to prevent the proliferation of improperly built native
480 // libraries, the new path component /usr/java/packages is added here.
481 // Eventually, all the library path setting will be done here.
482 {
483 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
484 // should always exist (until the legacy problem cited above is
485 // addressed).
486 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
487 // can specify a directory inside an app wrapper
488 const char *l = ::getenv("JAVA_LIBRARY_PATH");
489 const char *l_colon = ":";
490 if (l == NULL) { l = ""; l_colon = ""; }
491
492 const char *v = ::getenv("DYLD_LIBRARY_PATH");
493 const char *v_colon = ":";
494 if (v == NULL) { v = ""; v_colon = ""; }
495
496 // Apple's Java6 has "." at the beginning of java.library.path.
497 // OpenJDK on Windows has "." at the end of java.library.path.
498 // OpenJDK on Linux and Solaris don't have "." in java.library.path
499 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
500 // "." is appended to the end of java.library.path. Yes, this
501 // could cause a change in behavior, but Apple's Java6 behavior
502 // can be achieved by putting "." at the beginning of the
503 // JAVA_LIBRARY_PATH environment variable.
504 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
505 strlen(v) + 1 + strlen(l) + 1 +
506 system_ext_size + 3,
507 mtInternal);
508 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
509 v, v_colon, l, l_colon, user_home_dir);
510 Arguments::set_library_path(ld_library_path);
511 FREE_C_HEAP_ARRAY(char, ld_library_path);
512 }
513
514 // Extensions directories.
515 //
516 // Note that the space for the colon and the trailing null are provided
517 // by the nulls included by the sizeof operator (so actually one byte more
518 // than necessary is allocated).
519 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
520 user_home_dir, Arguments::get_java_home());
521 Arguments::set_ext_dirs(buf);
522
523 FREE_C_HEAP_ARRAY(char, buf);
524
525 #undef SYS_EXTENSIONS_DIR
526 #undef SYS_EXTENSIONS_DIRS
527
528 #endif // __APPLE__
529
530 #undef SYS_EXT_DIR
531 #undef EXTENSIONS_DIR
532 }
533
534 ////////////////////////////////////////////////////////////////////////////////
535 // breakpoint support
536
537 void os::breakpoint() {
538 BREAKPOINT;
539 }
540
541 extern "C" void breakpoint() {
542 // use debugger to set breakpoint here
543 }
544
545 ////////////////////////////////////////////////////////////////////////////////
546 // signal support
547
548 debug_only(static bool signal_sets_initialized = false);
549 static sigset_t unblocked_sigs, vm_sigs;
550
551 void os::Bsd::signal_sets_init() {
552 // Should also have an assertion stating we are still single-threaded.
553 assert(!signal_sets_initialized, "Already initialized");
554 // Fill in signals that are necessarily unblocked for all threads in
555 // the VM. Currently, we unblock the following signals:
556 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
557 // by -Xrs (=ReduceSignalUsage));
558 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
559 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
560 // the dispositions or masks wrt these signals.
561 // Programs embedding the VM that want to use the above signals for their
562 // own purposes must, at this time, use the "-Xrs" option to prevent
563 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
564 // (See bug 4345157, and other related bugs).
565 // In reality, though, unblocking these signals is really a nop, since
566 // these signals are not blocked by default.
567 sigemptyset(&unblocked_sigs);
568 sigaddset(&unblocked_sigs, SIGILL);
569 sigaddset(&unblocked_sigs, SIGSEGV);
570 sigaddset(&unblocked_sigs, SIGBUS);
571 sigaddset(&unblocked_sigs, SIGFPE);
572 sigaddset(&unblocked_sigs, SR_signum);
573
574 if (!ReduceSignalUsage) {
575 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
576 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
577
578 }
579 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
580 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
581 }
582 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
583 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
584 }
585 }
586 // Fill in signals that are blocked by all but the VM thread.
587 sigemptyset(&vm_sigs);
588 if (!ReduceSignalUsage) {
589 sigaddset(&vm_sigs, BREAK_SIGNAL);
590 }
591 debug_only(signal_sets_initialized = true);
592
593 }
594
595 // These are signals that are unblocked while a thread is running Java.
596 // (For some reason, they get blocked by default.)
597 sigset_t* os::Bsd::unblocked_signals() {
598 assert(signal_sets_initialized, "Not initialized");
599 return &unblocked_sigs;
600 }
601
602 // These are the signals that are blocked while a (non-VM) thread is
603 // running Java. Only the VM thread handles these signals.
604 sigset_t* os::Bsd::vm_signals() {
605 assert(signal_sets_initialized, "Not initialized");
606 return &vm_sigs;
607 }
608
609 void os::Bsd::hotspot_sigmask(Thread* thread) {
610
611 //Save caller's signal mask before setting VM signal mask
612 sigset_t caller_sigmask;
613 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
614
615 OSThread* osthread = thread->osthread();
616 osthread->set_caller_sigmask(caller_sigmask);
617
618 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
619
620 if (!ReduceSignalUsage) {
621 if (thread->is_VM_thread()) {
622 // Only the VM thread handles BREAK_SIGNAL ...
623 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
624 } else {
625 // ... all other threads block BREAK_SIGNAL
626 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
627 }
628 }
629 }
630
631
632 //////////////////////////////////////////////////////////////////////////////
633 // create new thread
634
635 #ifdef __APPLE__
636 // library handle for calling objc_registerThreadWithCollector()
637 // without static linking to the libobjc library
638 #define OBJC_LIB "/usr/lib/libobjc.dylib"
639 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
640 typedef void (*objc_registerThreadWithCollector_t)();
641 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
642 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
643 #endif
644
645 // Thread start routine for all newly created threads
646 static void *thread_native_entry(Thread *thread) {
647
648 thread->record_stack_base_and_size();
649
650 // Try to randomize the cache line index of hot stack frames.
651 // This helps when threads of the same stack traces evict each other's
652 // cache lines. The threads can be either from the same JVM instance, or
653 // from different JVM instances. The benefit is especially true for
654 // processors with hyperthreading technology.
655 static int counter = 0;
656 int pid = os::current_process_id();
657 alloca(((pid ^ counter++) & 7) * 128);
658
659 thread->initialize_thread_current();
660
661 OSThread* osthread = thread->osthread();
662 Monitor* sync = osthread->startThread_lock();
663
664 osthread->set_thread_id(os::Bsd::gettid());
665
666 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
667 os::current_thread_id(), (uintx) pthread_self());
668
669 #ifdef __APPLE__
670 // Store unique OS X thread id used by SA
671 osthread->set_unique_thread_id();
672 #endif
673
674 // initialize signal mask for this thread
675 os::Bsd::hotspot_sigmask(thread);
676
677 // initialize floating point control register
678 os::Bsd::init_thread_fpu_state();
679
680 #ifdef __APPLE__
681 // register thread with objc gc
682 if (objc_registerThreadWithCollectorFunction != NULL) {
683 objc_registerThreadWithCollectorFunction();
684 }
685 #endif
686
687 // handshaking with parent thread
688 {
689 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
690
691 // notify parent thread
692 osthread->set_state(INITIALIZED);
693 sync->notify_all();
694
695 // wait until os::start_thread()
696 while (osthread->get_state() == INITIALIZED) {
697 sync->wait_without_safepoint_check();
698 }
699 }
700
701 // call one more level start routine
702 thread->call_run();
703
704 // Note: at this point the thread object may already have deleted itself.
705 // Prevent dereferencing it from here on out.
706 thread = NULL;
707
708 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
709 os::current_thread_id(), (uintx) pthread_self());
710
711 return 0;
712 }
713
714 bool os::create_thread(Thread* thread, ThreadType thr_type,
715 size_t req_stack_size) {
716 assert(thread->osthread() == NULL, "caller responsible");
717
718 // Allocate the OSThread object
719 OSThread* osthread = new OSThread(NULL, NULL);
720 if (osthread == NULL) {
721 return false;
722 }
723
724 // set the correct thread state
725 osthread->set_thread_type(thr_type);
726
727 // Initial state is ALLOCATED but not INITIALIZED
728 osthread->set_state(ALLOCATED);
729
730 thread->set_osthread(osthread);
731
732 // init thread attributes
733 pthread_attr_t attr;
734 pthread_attr_init(&attr);
735 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
736
737 // calculate stack size if it's not specified by caller
738 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
739 int status = pthread_attr_setstacksize(&attr, stack_size);
740 assert_status(status == 0, status, "pthread_attr_setstacksize");
741
742 ThreadState state;
743
744 {
745 pthread_t tid;
746 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
747
748 char buf[64];
749 if (ret == 0) {
750 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
751 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
752 } else {
753 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
754 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
755 // Log some OS information which might explain why creating the thread failed.
756 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
757 LogStream st(Log(os, thread)::info());
758 os::Posix::print_rlimit_info(&st);
759 os::print_memory_info(&st);
760 }
761
762 pthread_attr_destroy(&attr);
763
764 if (ret != 0) {
765 // Need to clean up stuff we've allocated so far
766 thread->set_osthread(NULL);
767 delete osthread;
768 return false;
769 }
770
771 // Store pthread info into the OSThread
772 osthread->set_pthread_id(tid);
773
774 // Wait until child thread is either initialized or aborted
775 {
776 Monitor* sync_with_child = osthread->startThread_lock();
777 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
778 while ((state = osthread->get_state()) == ALLOCATED) {
779 sync_with_child->wait_without_safepoint_check();
780 }
781 }
782
783 }
784
785 // Aborted due to thread limit being reached
786 if (state == ZOMBIE) {
787 thread->set_osthread(NULL);
788 delete osthread;
789 return false;
790 }
791
792 // The thread is returned suspended (in state INITIALIZED),
793 // and is started higher up in the call chain
794 assert(state == INITIALIZED, "race condition");
795 return true;
796 }
797
798 /////////////////////////////////////////////////////////////////////////////
799 // attach existing thread
800
801 // bootstrap the main thread
802 bool os::create_main_thread(JavaThread* thread) {
803 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
804 return create_attached_thread(thread);
805 }
806
807 bool os::create_attached_thread(JavaThread* thread) {
808 #ifdef ASSERT
809 thread->verify_not_published();
810 #endif
811
812 // Allocate the OSThread object
813 OSThread* osthread = new OSThread(NULL, NULL);
814
815 if (osthread == NULL) {
816 return false;
817 }
818
819 osthread->set_thread_id(os::Bsd::gettid());
820
821 #ifdef __APPLE__
822 // Store unique OS X thread id used by SA
823 osthread->set_unique_thread_id();
824 #endif
825
826 // Store pthread info into the OSThread
827 osthread->set_pthread_id(::pthread_self());
828
829 // initialize floating point control register
830 os::Bsd::init_thread_fpu_state();
831
832 // Initial thread state is RUNNABLE
833 osthread->set_state(RUNNABLE);
834
835 thread->set_osthread(osthread);
836
837 // initialize signal mask for this thread
838 // and save the caller's signal mask
839 os::Bsd::hotspot_sigmask(thread);
840
841 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
842 os::current_thread_id(), (uintx) pthread_self());
843
844 return true;
845 }
846
847 void os::pd_start_thread(Thread* thread) {
848 OSThread * osthread = thread->osthread();
849 assert(osthread->get_state() != INITIALIZED, "just checking");
850 Monitor* sync_with_child = osthread->startThread_lock();
851 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
852 sync_with_child->notify();
853 }
854
855 // Free Bsd resources related to the OSThread
856 void os::free_thread(OSThread* osthread) {
857 assert(osthread != NULL, "osthread not set");
858
859 // We are told to free resources of the argument thread,
860 // but we can only really operate on the current thread.
861 assert(Thread::current()->osthread() == osthread,
862 "os::free_thread but not current thread");
863
864 // Restore caller's signal mask
865 sigset_t sigmask = osthread->caller_sigmask();
866 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
867
868 delete osthread;
869 }
870
871 ////////////////////////////////////////////////////////////////////////////////
872 // time support
873
874 // Time since start-up in seconds to a fine granularity.
875 // Used by VMSelfDestructTimer and the MemProfiler.
876 double os::elapsedTime() {
877
878 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
879 }
880
881 jlong os::elapsed_counter() {
882 return javaTimeNanos() - initial_time_count;
883 }
884
885 jlong os::elapsed_frequency() {
886 return NANOSECS_PER_SEC; // nanosecond resolution
887 }
888
889 bool os::supports_vtime() { return true; }
890
891 double os::elapsedVTime() {
892 // better than nothing, but not much
893 return elapsedTime();
894 }
895
896 jlong os::javaTimeMillis() {
897 timeval time;
898 int status = gettimeofday(&time, NULL);
899 assert(status != -1, "bsd error");
900 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
901 }
902
903 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
904 timeval time;
905 int status = gettimeofday(&time, NULL);
906 assert(status != -1, "bsd error");
907 seconds = jlong(time.tv_sec);
908 nanos = jlong(time.tv_usec) * 1000;
909 }
910
911 #ifndef __APPLE__
912 #ifndef CLOCK_MONOTONIC
913 #define CLOCK_MONOTONIC (1)
914 #endif
915 #endif
916
917 #ifdef __APPLE__
918 void os::Bsd::clock_init() {
919 mach_timebase_info(&_timebase_info);
920 }
921 #else
922 void os::Bsd::clock_init() {
923 struct timespec res;
924 struct timespec tp;
925 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
926 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
927 // yes, monotonic clock is supported
928 _clock_gettime = ::clock_gettime;
929 }
930 }
931 #endif
932
933
934
935 #ifdef __APPLE__
936
937 jlong os::javaTimeNanos() {
938 const uint64_t tm = mach_absolute_time();
939 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
940 const uint64_t prev = Bsd::_max_abstime;
941 if (now <= prev) {
942 return prev; // same or retrograde time;
943 }
944 const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now);
945 assert(obsv >= prev, "invariant"); // Monotonicity
946 // If the CAS succeeded then we're done and return "now".
947 // If the CAS failed and the observed value "obsv" is >= now then
948 // we should return "obsv". If the CAS failed and now > obsv > prv then
949 // some other thread raced this thread and installed a new value, in which case
950 // we could either (a) retry the entire operation, (b) retry trying to install now
951 // or (c) just return obsv. We use (c). No loop is required although in some cases
952 // we might discard a higher "now" value in deference to a slightly lower but freshly
953 // installed obsv value. That's entirely benign -- it admits no new orderings compared
954 // to (a) or (b) -- and greatly reduces coherence traffic.
955 // We might also condition (c) on the magnitude of the delta between obsv and now.
956 // Avoiding excessive CAS operations to hot RW locations is critical.
957 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
958 return (prev == obsv) ? now : obsv;
959 }
960
961 #else // __APPLE__
962
963 jlong os::javaTimeNanos() {
964 if (os::supports_monotonic_clock()) {
965 struct timespec tp;
966 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
967 assert(status == 0, "gettime error");
968 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
969 return result;
970 } else {
971 timeval time;
972 int status = gettimeofday(&time, NULL);
973 assert(status != -1, "bsd error");
974 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
975 return 1000 * usecs;
976 }
977 }
978
979 #endif // __APPLE__
980
981 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
982 if (os::supports_monotonic_clock()) {
983 info_ptr->max_value = ALL_64_BITS;
984
985 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
986 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
987 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
988 } else {
989 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
990 info_ptr->max_value = ALL_64_BITS;
991
992 // gettimeofday is a real time clock so it skips
993 info_ptr->may_skip_backward = true;
994 info_ptr->may_skip_forward = true;
995 }
996
997 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
998 }
999
1000 // Return the real, user, and system times in seconds from an
1001 // arbitrary fixed point in the past.
1002 bool os::getTimesSecs(double* process_real_time,
1003 double* process_user_time,
1004 double* process_system_time) {
1005 struct tms ticks;
1006 clock_t real_ticks = times(&ticks);
1007
1008 if (real_ticks == (clock_t) (-1)) {
1009 return false;
1010 } else {
1011 double ticks_per_second = (double) clock_tics_per_sec;
1012 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1013 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1014 *process_real_time = ((double) real_ticks) / ticks_per_second;
1015
1016 return true;
1017 }
1018 }
1019
1020
1021 char * os::local_time_string(char *buf, size_t buflen) {
1022 struct tm t;
1023 time_t long_time;
1024 time(&long_time);
1025 localtime_r(&long_time, &t);
1026 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1027 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1028 t.tm_hour, t.tm_min, t.tm_sec);
1029 return buf;
1030 }
1031
1032 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1033 return localtime_r(clock, res);
1034 }
1035
1036 ////////////////////////////////////////////////////////////////////////////////
1037 // runtime exit support
1038
1039 // Note: os::shutdown() might be called very early during initialization, or
1040 // called from signal handler. Before adding something to os::shutdown(), make
1041 // sure it is async-safe and can handle partially initialized VM.
1042 void os::shutdown() {
1043
1044 // allow PerfMemory to attempt cleanup of any persistent resources
1045 perfMemory_exit();
1046
1047 // needs to remove object in file system
1048 AttachListener::abort();
1049
1050 // flush buffered output, finish log files
1051 ostream_abort();
1052
1053 // Check for abort hook
1054 abort_hook_t abort_hook = Arguments::abort_hook();
1055 if (abort_hook != NULL) {
1056 abort_hook();
1057 }
1058
1059 }
1060
1061 // Note: os::abort() might be called very early during initialization, or
1062 // called from signal handler. Before adding something to os::abort(), make
1063 // sure it is async-safe and can handle partially initialized VM.
1064 void os::abort(bool dump_core, void* siginfo, const void* context) {
1065 os::shutdown();
1066 if (dump_core) {
1067 #ifndef PRODUCT
1068 fdStream out(defaultStream::output_fd());
1069 out.print_raw("Current thread is ");
1070 char buf[16];
1071 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1072 out.print_raw_cr(buf);
1073 out.print_raw_cr("Dumping core ...");
1074 #endif
1075 ::abort(); // dump core
1076 }
1077
1078 ::exit(1);
1079 }
1080
1081 // Die immediately, no exit hook, no abort hook, no cleanup.
1082 // Dump a core file, if possible, for debugging.
1083 void os::die() {
1084 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1085 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1086 // and don't take the time to generate a core file.
1087 os::signal_raise(SIGKILL);
1088 } else {
1089 // _exit() on BsdThreads only kills current thread
1090 ::abort();
1091 }
1092 }
1093
1094 // Information of current thread in variety of formats
1095 pid_t os::Bsd::gettid() {
1096 int retval = -1;
1097
1098 #ifdef __APPLE__ // XNU kernel
1099 mach_port_t port = mach_thread_self();
1100 guarantee(MACH_PORT_VALID(port), "just checking");
1101 mach_port_deallocate(mach_task_self(), port);
1102 return (pid_t)port;
1103
1104 #else
1105 #ifdef __FreeBSD__
1106 retval = syscall(SYS_thr_self);
1107 #else
1108 #ifdef __OpenBSD__
1109 retval = syscall(SYS_getthrid);
1110 #else
1111 #ifdef __NetBSD__
1112 retval = (pid_t) syscall(SYS__lwp_self);
1113 #endif
1114 #endif
1115 #endif
1116 #endif
1117
1118 if (retval == -1) {
1119 return getpid();
1120 }
1121 }
1122
1123 intx os::current_thread_id() {
1124 #ifdef __APPLE__
1125 return (intx)os::Bsd::gettid();
1126 #else
1127 return (intx)::pthread_self();
1128 #endif
1129 }
1130
1131 int os::current_process_id() {
1132 return (int)(getpid());
1133 }
1134
1135 // DLL functions
1136
1137 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1138
1139 // This must be hard coded because it's the system's temporary
1140 // directory not the java application's temp directory, ala java.io.tmpdir.
1141 #ifdef __APPLE__
1142 // macosx has a secure per-user temporary directory
1143 char temp_path_storage[PATH_MAX];
1144 const char* os::get_temp_directory() {
1145 static char *temp_path = NULL;
1146 if (temp_path == NULL) {
1147 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1148 if (pathSize == 0 || pathSize > PATH_MAX) {
1149 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1150 }
1151 temp_path = temp_path_storage;
1152 }
1153 return temp_path;
1154 }
1155 #else // __APPLE__
1156 const char* os::get_temp_directory() { return "/tmp"; }
1157 #endif // __APPLE__
1158
1159 // check if addr is inside libjvm.so
1160 bool os::address_is_in_vm(address addr) {
1161 static address libjvm_base_addr;
1162 Dl_info dlinfo;
1163
1164 if (libjvm_base_addr == NULL) {
1165 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1166 libjvm_base_addr = (address)dlinfo.dli_fbase;
1167 }
1168 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1169 }
1170
1171 if (dladdr((void *)addr, &dlinfo) != 0) {
1172 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1173 }
1174
1175 return false;
1176 }
1177
1178
1179 #define MACH_MAXSYMLEN 256
1180
1181 bool os::dll_address_to_function_name(address addr, char *buf,
1182 int buflen, int *offset,
1183 bool demangle) {
1184 // buf is not optional, but offset is optional
1185 assert(buf != NULL, "sanity check");
1186
1187 Dl_info dlinfo;
1188 char localbuf[MACH_MAXSYMLEN];
1189
1190 if (dladdr((void*)addr, &dlinfo) != 0) {
1191 // see if we have a matching symbol
1192 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1193 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1194 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1195 }
1196 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1197 return true;
1198 }
1199 // no matching symbol so try for just file info
1200 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1201 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1202 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1203 return true;
1204 }
1205 }
1206
1207 // Handle non-dynamic manually:
1208 if (dlinfo.dli_fbase != NULL &&
1209 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1210 dlinfo.dli_fbase)) {
1211 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1212 jio_snprintf(buf, buflen, "%s", localbuf);
1213 }
1214 return true;
1215 }
1216 }
1217 buf[0] = '\0';
1218 if (offset != NULL) *offset = -1;
1219 return false;
1220 }
1221
1222 // ported from solaris version
1223 bool os::dll_address_to_library_name(address addr, char* buf,
1224 int buflen, int* offset) {
1225 // buf is not optional, but offset is optional
1226 assert(buf != NULL, "sanity check");
1227
1228 Dl_info dlinfo;
1229
1230 if (dladdr((void*)addr, &dlinfo) != 0) {
1231 if (dlinfo.dli_fname != NULL) {
1232 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1233 }
1234 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1235 *offset = addr - (address)dlinfo.dli_fbase;
1236 }
1237 return true;
1238 }
1239
1240 buf[0] = '\0';
1241 if (offset) *offset = -1;
1242 return false;
1243 }
1244
1245 // Loads .dll/.so and
1246 // in case of error it checks if .dll/.so was built for the
1247 // same architecture as Hotspot is running on
1248
1249 #ifdef __APPLE__
1250 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1251 #ifdef STATIC_BUILD
1252 return os::get_default_process_handle();
1253 #else
1254 log_info(os)("attempting shared library load of %s", filename);
1255
1256 void * result= ::dlopen(filename, RTLD_LAZY);
1257 if (result != NULL) {
1258 Events::log(NULL, "Loaded shared library %s", filename);
1259 // Successful loading
1260 log_info(os)("shared library load of %s was successful", filename);
1261 return result;
1262 }
1263
1264 const char* error_report = ::dlerror();
1265 if (error_report == NULL) {
1266 error_report = "dlerror returned no error description";
1267 }
1268 if (ebuf != NULL && ebuflen > 0) {
1269 // Read system error message into ebuf
1270 ::strncpy(ebuf, error_report, ebuflen-1);
1271 ebuf[ebuflen-1]='\0';
1272 }
1273 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1274 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1275
1276 return NULL;
1277 #endif // STATIC_BUILD
1278 }
1279 #else
1280 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1281 #ifdef STATIC_BUILD
1282 return os::get_default_process_handle();
1283 #else
1284 log_info(os)("attempting shared library load of %s", filename);
1285 void * result= ::dlopen(filename, RTLD_LAZY);
1286 if (result != NULL) {
1287 Events::log(NULL, "Loaded shared library %s", filename);
1288 // Successful loading
1289 log_info(os)("shared library load of %s was successful", filename);
1290 return result;
1291 }
1292
1293 Elf32_Ehdr elf_head;
1294
1295 const char* const error_report = ::dlerror();
1296 if (error_report == NULL) {
1297 error_report = "dlerror returned no error description";
1298 }
1299 if (ebuf != NULL && ebuflen > 0) {
1300 // Read system error message into ebuf
1301 ::strncpy(ebuf, error_report, ebuflen-1);
1302 ebuf[ebuflen-1]='\0';
1303 }
1304 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1305 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1306
1307 int diag_msg_max_length=ebuflen-strlen(ebuf);
1308 char* diag_msg_buf=ebuf+strlen(ebuf);
1309
1310 if (diag_msg_max_length==0) {
1311 // No more space in ebuf for additional diagnostics message
1312 return NULL;
1313 }
1314
1315
1316 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1317
1318 if (file_descriptor < 0) {
1319 // Can't open library, report dlerror() message
1320 return NULL;
1321 }
1322
1323 bool failed_to_read_elf_head=
1324 (sizeof(elf_head)!=
1325 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1326
1327 ::close(file_descriptor);
1328 if (failed_to_read_elf_head) {
1329 // file i/o error - report dlerror() msg
1330 return NULL;
1331 }
1332
1333 typedef struct {
1334 Elf32_Half code; // Actual value as defined in elf.h
1335 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1336 char elf_class; // 32 or 64 bit
1337 char endianess; // MSB or LSB
1338 char* name; // String representation
1339 } arch_t;
1340
1341 #ifndef EM_486
1342 #define EM_486 6 /* Intel 80486 */
1343 #endif
1344
1345 #ifndef EM_MIPS_RS3_LE
1346 #define EM_MIPS_RS3_LE 10 /* MIPS */
1347 #endif
1348
1349 #ifndef EM_PPC64
1350 #define EM_PPC64 21 /* PowerPC64 */
1351 #endif
1352
1353 #ifndef EM_S390
1354 #define EM_S390 22 /* IBM System/390 */
1355 #endif
1356
1357 #ifndef EM_IA_64
1358 #define EM_IA_64 50 /* HP/Intel IA-64 */
1359 #endif
1360
1361 #ifndef EM_X86_64
1362 #define EM_X86_64 62 /* AMD x86-64 */
1363 #endif
1364
1365 static const arch_t arch_array[]={
1366 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1367 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1368 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1369 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1370 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1371 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1372 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1373 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1374 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1375 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1376 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1377 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1378 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1379 };
1380
1381 #if (defined IA32)
1382 static Elf32_Half running_arch_code=EM_386;
1383 #elif (defined AMD64)
1384 static Elf32_Half running_arch_code=EM_X86_64;
1385 #elif (defined IA64)
1386 static Elf32_Half running_arch_code=EM_IA_64;
1387 #elif (defined __powerpc64__)
1388 static Elf32_Half running_arch_code=EM_PPC64;
1389 #elif (defined __powerpc__)
1390 static Elf32_Half running_arch_code=EM_PPC;
1391 #elif (defined ARM)
1392 static Elf32_Half running_arch_code=EM_ARM;
1393 #elif (defined S390)
1394 static Elf32_Half running_arch_code=EM_S390;
1395 #elif (defined ALPHA)
1396 static Elf32_Half running_arch_code=EM_ALPHA;
1397 #elif (defined MIPSEL)
1398 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1399 #elif (defined PARISC)
1400 static Elf32_Half running_arch_code=EM_PARISC;
1401 #elif (defined MIPS)
1402 static Elf32_Half running_arch_code=EM_MIPS;
1403 #elif (defined M68K)
1404 static Elf32_Half running_arch_code=EM_68K;
1405 #else
1406 #error Method os::dll_load requires that one of following is defined:\
1407 IA32, AMD64, IA64, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1408 #endif
1409
1410 // Identify compatability class for VM's architecture and library's architecture
1411 // Obtain string descriptions for architectures
1412
1413 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1414 int running_arch_index=-1;
1415
1416 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1417 if (running_arch_code == arch_array[i].code) {
1418 running_arch_index = i;
1419 }
1420 if (lib_arch.code == arch_array[i].code) {
1421 lib_arch.compat_class = arch_array[i].compat_class;
1422 lib_arch.name = arch_array[i].name;
1423 }
1424 }
1425
1426 assert(running_arch_index != -1,
1427 "Didn't find running architecture code (running_arch_code) in arch_array");
1428 if (running_arch_index == -1) {
1429 // Even though running architecture detection failed
1430 // we may still continue with reporting dlerror() message
1431 return NULL;
1432 }
1433
1434 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1435 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1436 return NULL;
1437 }
1438
1439 #ifndef S390
1440 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1441 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1442 return NULL;
1443 }
1444 #endif // !S390
1445
1446 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1447 if (lib_arch.name!=NULL) {
1448 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1449 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1450 lib_arch.name, arch_array[running_arch_index].name);
1451 } else {
1452 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1453 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1454 lib_arch.code,
1455 arch_array[running_arch_index].name);
1456 }
1457 }
1458
1459 return NULL;
1460 #endif // STATIC_BUILD
1461 }
1462 #endif // !__APPLE__
1463
1464 void* os::get_default_process_handle() {
1465 #ifdef __APPLE__
1466 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1467 // to avoid finding unexpected symbols on second (or later)
1468 // loads of a library.
1469 return (void*)::dlopen(NULL, RTLD_FIRST);
1470 #else
1471 return (void*)::dlopen(NULL, RTLD_LAZY);
1472 #endif
1473 }
1474
1475 // XXX: Do we need a lock around this as per Linux?
1476 void* os::dll_lookup(void* handle, const char* name) {
1477 return dlsym(handle, name);
1478 }
1479
1480 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1481 outputStream * out = (outputStream *) param;
1482 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1483 return 0;
1484 }
1485
1486 void os::print_dll_info(outputStream *st) {
1487 st->print_cr("Dynamic libraries:");
1488 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1489 st->print_cr("Error: Cannot print dynamic libraries.");
1490 }
1491 }
1492
1493 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1494 #ifdef RTLD_DI_LINKMAP
1495 Dl_info dli;
1496 void *handle;
1497 Link_map *map;
1498 Link_map *p;
1499
1500 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1501 dli.dli_fname == NULL) {
1502 return 1;
1503 }
1504 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1505 if (handle == NULL) {
1506 return 1;
1507 }
1508 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1509 if (map == NULL) {
1510 dlclose(handle);
1511 return 1;
1512 }
1513
1514 while (map->l_prev != NULL)
1515 map = map->l_prev;
1516
1517 while (map != NULL) {
1518 // Value for top_address is returned as 0 since we don't have any information about module size
1519 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1520 dlclose(handle);
1521 return 1;
1522 }
1523 map = map->l_next;
1524 }
1525
1526 dlclose(handle);
1527 #elif defined(__APPLE__)
1528 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1529 // Value for top_address is returned as 0 since we don't have any information about module size
1530 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1531 return 1;
1532 }
1533 }
1534 return 0;
1535 #else
1536 return 1;
1537 #endif
1538 }
1539
1540 void os::get_summary_os_info(char* buf, size_t buflen) {
1541 // These buffers are small because we want this to be brief
1542 // and not use a lot of stack while generating the hs_err file.
1543 char os[100];
1544 size_t size = sizeof(os);
1545 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1546 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1547 #ifdef __APPLE__
1548 strncpy(os, "Darwin", sizeof(os));
1549 #elif __OpenBSD__
1550 strncpy(os, "OpenBSD", sizeof(os));
1551 #else
1552 strncpy(os, "BSD", sizeof(os));
1553 #endif
1554 }
1555
1556 char release[100];
1557 size = sizeof(release);
1558 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1559 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1560 // if error, leave blank
1561 strncpy(release, "", sizeof(release));
1562 }
1563 snprintf(buf, buflen, "%s %s", os, release);
1564 }
1565
1566 void os::print_os_info_brief(outputStream* st) {
1567 os::Posix::print_uname_info(st);
1568 }
1569
1570 void os::print_os_info(outputStream* st) {
1571 st->print("OS:");
1572
1573 os::Posix::print_uname_info(st);
1574
1575 os::Bsd::print_uptime_info(st);
1576
1577 os::Posix::print_rlimit_info(st);
1578
1579 os::Posix::print_load_average(st);
1580
1581 VM_Version::print_platform_virtualization_info(st);
1582 }
1583
1584 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1585 // Nothing to do for now.
1586 }
1587
1588 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1589 unsigned int mhz;
1590 size_t size = sizeof(mhz);
1591 int mib[] = { CTL_HW, HW_CPU_FREQ };
1592 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1593 mhz = 1; // looks like an error but can be divided by
1594 } else {
1595 mhz /= 1000000; // reported in millions
1596 }
1597
1598 char model[100];
1599 size = sizeof(model);
1600 int mib_model[] = { CTL_HW, HW_MODEL };
1601 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1602 strncpy(model, cpu_arch, sizeof(model));
1603 }
1604
1605 char machine[100];
1606 size = sizeof(machine);
1607 int mib_machine[] = { CTL_HW, HW_MACHINE };
1608 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1609 strncpy(machine, "", sizeof(machine));
1610 }
1611
1612 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1613 }
1614
1615 void os::print_memory_info(outputStream* st) {
1616 xsw_usage swap_usage;
1617 size_t size = sizeof(swap_usage);
1618
1619 st->print("Memory:");
1620 st->print(" %dk page", os::vm_page_size()>>10);
1621
1622 st->print(", physical " UINT64_FORMAT "k",
1623 os::physical_memory() >> 10);
1624 st->print("(" UINT64_FORMAT "k free)",
1625 os::available_memory() >> 10);
1626
1627 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1628 if (size >= offset_of(xsw_usage, xsu_used)) {
1629 st->print(", swap " UINT64_FORMAT "k",
1630 ((julong) swap_usage.xsu_total) >> 10);
1631 st->print("(" UINT64_FORMAT "k free)",
1632 ((julong) swap_usage.xsu_avail) >> 10);
1633 }
1634 }
1635
1636 st->cr();
1637 }
1638
1639 static void print_signal_handler(outputStream* st, int sig,
1640 char* buf, size_t buflen);
1641
1642 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1643 st->print_cr("Signal Handlers:");
1644 print_signal_handler(st, SIGSEGV, buf, buflen);
1645 print_signal_handler(st, SIGBUS , buf, buflen);
1646 print_signal_handler(st, SIGFPE , buf, buflen);
1647 print_signal_handler(st, SIGPIPE, buf, buflen);
1648 print_signal_handler(st, SIGXFSZ, buf, buflen);
1649 print_signal_handler(st, SIGILL , buf, buflen);
1650 print_signal_handler(st, SR_signum, buf, buflen);
1651 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1652 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1653 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1654 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1655 }
1656
1657 static char saved_jvm_path[MAXPATHLEN] = {0};
1658
1659 // Find the full path to the current module, libjvm
1660 void os::jvm_path(char *buf, jint buflen) {
1661 // Error checking.
1662 if (buflen < MAXPATHLEN) {
1663 assert(false, "must use a large-enough buffer");
1664 buf[0] = '\0';
1665 return;
1666 }
1667 // Lazy resolve the path to current module.
1668 if (saved_jvm_path[0] != 0) {
1669 strcpy(buf, saved_jvm_path);
1670 return;
1671 }
1672
1673 char dli_fname[MAXPATHLEN];
1674 bool ret = dll_address_to_library_name(
1675 CAST_FROM_FN_PTR(address, os::jvm_path),
1676 dli_fname, sizeof(dli_fname), NULL);
1677 assert(ret, "cannot locate libjvm");
1678 char *rp = NULL;
1679 if (ret && dli_fname[0] != '\0') {
1680 rp = os::Posix::realpath(dli_fname, buf, buflen);
1681 }
1682 if (rp == NULL) {
1683 return;
1684 }
1685
1686 if (Arguments::sun_java_launcher_is_altjvm()) {
1687 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1688 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1689 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1690 // appears at the right place in the string, then assume we are
1691 // installed in a JDK and we're done. Otherwise, check for a
1692 // JAVA_HOME environment variable and construct a path to the JVM
1693 // being overridden.
1694
1695 const char *p = buf + strlen(buf) - 1;
1696 for (int count = 0; p > buf && count < 5; ++count) {
1697 for (--p; p > buf && *p != '/'; --p)
1698 /* empty */ ;
1699 }
1700
1701 if (strncmp(p, "/jre/lib/", 9) != 0) {
1702 // Look for JAVA_HOME in the environment.
1703 char* java_home_var = ::getenv("JAVA_HOME");
1704 if (java_home_var != NULL && java_home_var[0] != 0) {
1705 char* jrelib_p;
1706 int len;
1707
1708 // Check the current module name "libjvm"
1709 p = strrchr(buf, '/');
1710 assert(strstr(p, "/libjvm") == p, "invalid library name");
1711
1712 rp = os::Posix::realpath(java_home_var, buf, buflen);
1713 if (rp == NULL) {
1714 return;
1715 }
1716
1717 // determine if this is a legacy image or modules image
1718 // modules image doesn't have "jre" subdirectory
1719 len = strlen(buf);
1720 assert(len < buflen, "Ran out of buffer space");
1721 jrelib_p = buf + len;
1722
1723 // Add the appropriate library subdir
1724 snprintf(jrelib_p, buflen-len, "/jre/lib");
1725 if (0 != access(buf, F_OK)) {
1726 snprintf(jrelib_p, buflen-len, "/lib");
1727 }
1728
1729 // Add the appropriate client or server subdir
1730 len = strlen(buf);
1731 jrelib_p = buf + len;
1732 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1733 if (0 != access(buf, F_OK)) {
1734 snprintf(jrelib_p, buflen-len, "%s", "");
1735 }
1736
1737 // If the path exists within JAVA_HOME, add the JVM library name
1738 // to complete the path to JVM being overridden. Otherwise fallback
1739 // to the path to the current library.
1740 if (0 == access(buf, F_OK)) {
1741 // Use current module name "libjvm"
1742 len = strlen(buf);
1743 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1744 } else {
1745 // Fall back to path of current library
1746 rp = os::Posix::realpath(dli_fname, buf, buflen);
1747 if (rp == NULL) {
1748 return;
1749 }
1750 }
1751 }
1752 }
1753 }
1754
1755 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1756 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1757 }
1758
1759 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1760 // no prefix required, not even "_"
1761 }
1762
1763 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1764 // no suffix required
1765 }
1766
1767 ////////////////////////////////////////////////////////////////////////////////
1768 // sun.misc.Signal support
1769
1770 static void UserHandler(int sig, void *siginfo, void *context) {
1771 // Ctrl-C is pressed during error reporting, likely because the error
1772 // handler fails to abort. Let VM die immediately.
1773 if (sig == SIGINT && VMError::is_error_reported()) {
1774 os::die();
1775 }
1776
1777 os::signal_notify(sig);
1778 }
1779
1780 void* os::user_handler() {
1781 return CAST_FROM_FN_PTR(void*, UserHandler);
1782 }
1783
1784 extern "C" {
1785 typedef void (*sa_handler_t)(int);
1786 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1787 }
1788
1789 void* os::signal(int signal_number, void* handler) {
1790 struct sigaction sigAct, oldSigAct;
1791
1792 sigfillset(&(sigAct.sa_mask));
1793 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1794 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1795
1796 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1797 // -1 means registration failed
1798 return (void *)-1;
1799 }
1800
1801 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1802 }
1803
1804 void os::signal_raise(int signal_number) {
1805 ::raise(signal_number);
1806 }
1807
1808 // The following code is moved from os.cpp for making this
1809 // code platform specific, which it is by its very nature.
1810
1811 // Will be modified when max signal is changed to be dynamic
1812 int os::sigexitnum_pd() {
1813 return NSIG;
1814 }
1815
1816 // a counter for each possible signal value
1817 static volatile jint pending_signals[NSIG+1] = { 0 };
1818 static Semaphore* sig_sem = NULL;
1819
1820 static void jdk_misc_signal_init() {
1821 // Initialize signal structures
1822 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1823
1824 // Initialize signal semaphore
1825 sig_sem = new Semaphore();
1826 }
1827
1828 void os::signal_notify(int sig) {
1829 if (sig_sem != NULL) {
1830 Atomic::inc(&pending_signals[sig]);
1831 sig_sem->signal();
1832 } else {
1833 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1834 // initialization isn't called.
1835 assert(ReduceSignalUsage, "signal semaphore should be created");
1836 }
1837 }
1838
1839 static int check_pending_signals() {
1840 for (;;) {
1841 for (int i = 0; i < NSIG + 1; i++) {
1842 jint n = pending_signals[i];
1843 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1844 return i;
1845 }
1846 }
1847 JavaThread *thread = JavaThread::current();
1848 ThreadBlockInVM tbivm(thread);
1849
1850 bool threadIsSuspended;
1851 do {
1852 thread->set_suspend_equivalent();
1853 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1854 sig_sem->wait();
1855
1856 // were we externally suspended while we were waiting?
1857 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1858 if (threadIsSuspended) {
1859 // The semaphore has been incremented, but while we were waiting
1860 // another thread suspended us. We don't want to continue running
1861 // while suspended because that would surprise the thread that
1862 // suspended us.
1863 sig_sem->signal();
1864
1865 thread->java_suspend_self();
1866 }
1867 } while (threadIsSuspended);
1868 }
1869 }
1870
1871 int os::signal_wait() {
1872 return check_pending_signals();
1873 }
1874
1875 ////////////////////////////////////////////////////////////////////////////////
1876 // Virtual Memory
1877
1878 int os::vm_page_size() {
1879 // Seems redundant as all get out
1880 assert(os::Bsd::page_size() != -1, "must call os::init");
1881 return os::Bsd::page_size();
1882 }
1883
1884 // Solaris allocates memory by pages.
1885 int os::vm_allocation_granularity() {
1886 assert(os::Bsd::page_size() != -1, "must call os::init");
1887 return os::Bsd::page_size();
1888 }
1889
1890 // Rationale behind this function:
1891 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1892 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1893 // samples for JITted code. Here we create private executable mapping over the code cache
1894 // and then we can use standard (well, almost, as mapping can change) way to provide
1895 // info for the reporting script by storing timestamp and location of symbol
1896 void bsd_wrap_code(char* base, size_t size) {
1897 static volatile jint cnt = 0;
1898
1899 if (!UseOprofile) {
1900 return;
1901 }
1902
1903 char buf[PATH_MAX + 1];
1904 int num = Atomic::add(&cnt, 1);
1905
1906 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1907 os::get_temp_directory(), os::current_process_id(), num);
1908 unlink(buf);
1909
1910 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1911
1912 if (fd != -1) {
1913 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1914 if (rv != (off_t)-1) {
1915 if (::write(fd, "", 1) == 1) {
1916 mmap(base, size,
1917 PROT_READ|PROT_WRITE|PROT_EXEC,
1918 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1919 }
1920 }
1921 ::close(fd);
1922 unlink(buf);
1923 }
1924 }
1925
1926 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1927 int err) {
1928 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1929 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1930 os::errno_name(err), err);
1931 }
1932
1933 // NOTE: Bsd kernel does not really reserve the pages for us.
1934 // All it does is to check if there are enough free pages
1935 // left at the time of mmap(). This could be a potential
1936 // problem.
1937 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1938 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1939 #ifdef __OpenBSD__
1940 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1941 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1942 if (::mprotect(addr, size, prot) == 0) {
1943 return true;
1944 }
1945 #else
1946 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1947 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1948 if (res != (uintptr_t) MAP_FAILED) {
1949 return true;
1950 }
1951 #endif
1952
1953 // Warn about any commit errors we see in non-product builds just
1954 // in case mmap() doesn't work as described on the man page.
1955 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1956
1957 return false;
1958 }
1959
1960 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1961 bool exec) {
1962 // alignment_hint is ignored on this OS
1963 return pd_commit_memory(addr, size, exec);
1964 }
1965
1966 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1967 const char* mesg) {
1968 assert(mesg != NULL, "mesg must be specified");
1969 if (!pd_commit_memory(addr, size, exec)) {
1970 // add extra info in product mode for vm_exit_out_of_memory():
1971 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1972 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1973 }
1974 }
1975
1976 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1977 size_t alignment_hint, bool exec,
1978 const char* mesg) {
1979 // alignment_hint is ignored on this OS
1980 pd_commit_memory_or_exit(addr, size, exec, mesg);
1981 }
1982
1983 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1984 }
1985
1986 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
1987 ::madvise(addr, bytes, MADV_DONTNEED);
1988 }
1989
1990 void os::numa_make_global(char *addr, size_t bytes) {
1991 }
1992
1993 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
1994 }
1995
1996 bool os::numa_topology_changed() { return false; }
1997
1998 size_t os::numa_get_groups_num() {
1999 return 1;
2000 }
2001
2002 int os::numa_get_group_id() {
2003 return 0;
2004 }
2005
2006 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2007 if (size > 0) {
2008 ids[0] = 0;
2009 return 1;
2010 }
2011 return 0;
2012 }
2013
2014 int os::numa_get_group_id_for_address(const void* address) {
2015 return 0;
2016 }
2017
2018 bool os::get_page_info(char *start, page_info* info) {
2019 return false;
2020 }
2021
2022 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2023 return end;
2024 }
2025
2026
2027 bool os::pd_uncommit_memory(char* addr, size_t size) {
2028 #ifdef __OpenBSD__
2029 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2030 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2031 return ::mprotect(addr, size, PROT_NONE) == 0;
2032 #else
2033 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2034 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2035 return res != (uintptr_t) MAP_FAILED;
2036 #endif
2037 }
2038
2039 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2040 return os::commit_memory(addr, size, !ExecMem);
2041 }
2042
2043 // If this is a growable mapping, remove the guard pages entirely by
2044 // munmap()ping them. If not, just call uncommit_memory().
2045 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2046 return os::uncommit_memory(addr, size);
2047 }
2048
2049 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2050 // at 'requested_addr'. If there are existing memory mappings at the same
2051 // location, however, they will be overwritten. If 'fixed' is false,
2052 // 'requested_addr' is only treated as a hint, the return value may or
2053 // may not start from the requested address. Unlike Bsd mmap(), this
2054 // function returns NULL to indicate failure.
2055 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2056 char * addr;
2057 int flags;
2058
2059 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2060 if (fixed) {
2061 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2062 flags |= MAP_FIXED;
2063 }
2064
2065 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2066 // touch an uncommitted page. Otherwise, the read/write might
2067 // succeed if we have enough swap space to back the physical page.
2068 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2069 flags, -1, 0);
2070
2071 return addr == MAP_FAILED ? NULL : addr;
2072 }
2073
2074 static int anon_munmap(char * addr, size_t size) {
2075 return ::munmap(addr, size) == 0;
2076 }
2077
2078 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2079 size_t alignment_hint) {
2080 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2081 }
2082
2083 bool os::pd_release_memory(char* addr, size_t size) {
2084 return anon_munmap(addr, size);
2085 }
2086
2087 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2088 // Bsd wants the mprotect address argument to be page aligned.
2089 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2090
2091 // According to SUSv3, mprotect() should only be used with mappings
2092 // established by mmap(), and mmap() always maps whole pages. Unaligned
2093 // 'addr' likely indicates problem in the VM (e.g. trying to change
2094 // protection of malloc'ed or statically allocated memory). Check the
2095 // caller if you hit this assert.
2096 assert(addr == bottom, "sanity check");
2097
2098 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2099 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2100 return ::mprotect(bottom, size, prot) == 0;
2101 }
2102
2103 // Set protections specified
2104 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2105 bool is_committed) {
2106 unsigned int p = 0;
2107 switch (prot) {
2108 case MEM_PROT_NONE: p = PROT_NONE; break;
2109 case MEM_PROT_READ: p = PROT_READ; break;
2110 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2111 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2112 default:
2113 ShouldNotReachHere();
2114 }
2115 // is_committed is unused.
2116 return bsd_mprotect(addr, bytes, p);
2117 }
2118
2119 bool os::guard_memory(char* addr, size_t size) {
2120 return bsd_mprotect(addr, size, PROT_NONE);
2121 }
2122
2123 bool os::unguard_memory(char* addr, size_t size) {
2124 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2125 }
2126
2127 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2128 return false;
2129 }
2130
2131 // Large page support
2132
2133 static size_t _large_page_size = 0;
2134
2135 void os::large_page_init() {
2136 }
2137
2138
2139 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2140 fatal("os::reserve_memory_special should not be called on BSD.");
2141 return NULL;
2142 }
2143
2144 bool os::pd_release_memory_special(char* base, size_t bytes) {
2145 fatal("os::release_memory_special should not be called on BSD.");
2146 return false;
2147 }
2148
2149 size_t os::large_page_size() {
2150 return _large_page_size;
2151 }
2152
2153 bool os::can_commit_large_page_memory() {
2154 // Does not matter, we do not support huge pages.
2155 return false;
2156 }
2157
2158 bool os::can_execute_large_page_memory() {
2159 // Does not matter, we do not support huge pages.
2160 return false;
2161 }
2162
2163 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2164 assert(file_desc >= 0, "file_desc is not valid");
2165 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2166 if (result != NULL) {
2167 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2168 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2169 }
2170 }
2171 return result;
2172 }
2173
2174 // Reserve memory at an arbitrary address, only if that area is
2175 // available (and not reserved for something else).
2176
2177 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2178 // Assert only that the size is a multiple of the page size, since
2179 // that's all that mmap requires, and since that's all we really know
2180 // about at this low abstraction level. If we need higher alignment,
2181 // we can either pass an alignment to this method or verify alignment
2182 // in one of the methods further up the call chain. See bug 5044738.
2183 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2184
2185 // Repeatedly allocate blocks until the block is allocated at the
2186 // right spot.
2187
2188 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2189 // if kernel honors the hint then we can return immediately.
2190 char * addr = anon_mmap(requested_addr, bytes, false);
2191 if (addr == requested_addr) {
2192 return requested_addr;
2193 }
2194
2195 if (addr != NULL) {
2196 // mmap() is successful but it fails to reserve at the requested address
2197 anon_munmap(addr, bytes);
2198 }
2199
2200 return NULL;
2201 }
2202
2203 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2204 void os::infinite_sleep() {
2205 while (true) { // sleep forever ...
2206 ::sleep(100); // ... 100 seconds at a time
2207 }
2208 }
2209
2210 // Used to convert frequent JVM_Yield() to nops
2211 bool os::dont_yield() {
2212 return DontYieldALot;
2213 }
2214
2215 void os::naked_yield() {
2216 sched_yield();
2217 }
2218
2219 ////////////////////////////////////////////////////////////////////////////////
2220 // thread priority support
2221
2222 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2223 // only supports dynamic priority, static priority must be zero. For real-time
2224 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2225 // However, for large multi-threaded applications, SCHED_RR is not only slower
2226 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2227 // of 5 runs - Sep 2005).
2228 //
2229 // The following code actually changes the niceness of kernel-thread/LWP. It
2230 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2231 // not the entire user process, and user level threads are 1:1 mapped to kernel
2232 // threads. It has always been the case, but could change in the future. For
2233 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2234 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2235 // (e.g., root privilege or CAP_SYS_NICE capability).
2236
2237 #if !defined(__APPLE__)
2238 int os::java_to_os_priority[CriticalPriority + 1] = {
2239 19, // 0 Entry should never be used
2240
2241 0, // 1 MinPriority
2242 3, // 2
2243 6, // 3
2244
2245 10, // 4
2246 15, // 5 NormPriority
2247 18, // 6
2248
2249 21, // 7
2250 25, // 8
2251 28, // 9 NearMaxPriority
2252
2253 31, // 10 MaxPriority
2254
2255 31 // 11 CriticalPriority
2256 };
2257 #else
2258 // Using Mach high-level priority assignments
2259 int os::java_to_os_priority[CriticalPriority + 1] = {
2260 0, // 0 Entry should never be used (MINPRI_USER)
2261
2262 27, // 1 MinPriority
2263 28, // 2
2264 29, // 3
2265
2266 30, // 4
2267 31, // 5 NormPriority (BASEPRI_DEFAULT)
2268 32, // 6
2269
2270 33, // 7
2271 34, // 8
2272 35, // 9 NearMaxPriority
2273
2274 36, // 10 MaxPriority
2275
2276 36 // 11 CriticalPriority
2277 };
2278 #endif
2279
2280 static int prio_init() {
2281 if (ThreadPriorityPolicy == 1) {
2282 if (geteuid() != 0) {
2283 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) {
2284 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2285 "e.g., being the root user. If the necessary permission is not " \
2286 "possessed, changes to priority will be silently ignored.");
2287 }
2288 }
2289 }
2290 if (UseCriticalJavaThreadPriority) {
2291 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2292 }
2293 return 0;
2294 }
2295
2296 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2297 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2298
2299 #ifdef __OpenBSD__
2300 // OpenBSD pthread_setprio starves low priority threads
2301 return OS_OK;
2302 #elif defined(__FreeBSD__)
2303 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2304 return (ret == 0) ? OS_OK : OS_ERR;
2305 #elif defined(__APPLE__) || defined(__NetBSD__)
2306 struct sched_param sp;
2307 int policy;
2308
2309 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2310 return OS_ERR;
2311 }
2312
2313 sp.sched_priority = newpri;
2314 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2315 return OS_ERR;
2316 }
2317
2318 return OS_OK;
2319 #else
2320 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2321 return (ret == 0) ? OS_OK : OS_ERR;
2322 #endif
2323 }
2324
2325 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2326 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2327 *priority_ptr = java_to_os_priority[NormPriority];
2328 return OS_OK;
2329 }
2330
2331 errno = 0;
2332 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2333 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2334 #elif defined(__APPLE__) || defined(__NetBSD__)
2335 int policy;
2336 struct sched_param sp;
2337
2338 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2339 if (res != 0) {
2340 *priority_ptr = -1;
2341 return OS_ERR;
2342 } else {
2343 *priority_ptr = sp.sched_priority;
2344 return OS_OK;
2345 }
2346 #else
2347 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2348 #endif
2349 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2350 }
2351
2352 ////////////////////////////////////////////////////////////////////////////////
2353 // suspend/resume support
2354
2355 // The low-level signal-based suspend/resume support is a remnant from the
2356 // old VM-suspension that used to be for java-suspension, safepoints etc,
2357 // within hotspot. Currently used by JFR's OSThreadSampler
2358 //
2359 // The remaining code is greatly simplified from the more general suspension
2360 // code that used to be used.
2361 //
2362 // The protocol is quite simple:
2363 // - suspend:
2364 // - sends a signal to the target thread
2365 // - polls the suspend state of the osthread using a yield loop
2366 // - target thread signal handler (SR_handler) sets suspend state
2367 // and blocks in sigsuspend until continued
2368 // - resume:
2369 // - sets target osthread state to continue
2370 // - sends signal to end the sigsuspend loop in the SR_handler
2371 //
2372 // Note that the SR_lock plays no role in this suspend/resume protocol,
2373 // but is checked for NULL in SR_handler as a thread termination indicator.
2374 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2375 //
2376 // Note that resume_clear_context() and suspend_save_context() are needed
2377 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2378 // which in part is used by:
2379 // - Forte Analyzer: AsyncGetCallTrace()
2380 // - StackBanging: get_frame_at_stack_banging_point()
2381
2382 static void resume_clear_context(OSThread *osthread) {
2383 osthread->set_ucontext(NULL);
2384 osthread->set_siginfo(NULL);
2385 }
2386
2387 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2388 osthread->set_ucontext(context);
2389 osthread->set_siginfo(siginfo);
2390 }
2391
2392 // Handler function invoked when a thread's execution is suspended or
2393 // resumed. We have to be careful that only async-safe functions are
2394 // called here (Note: most pthread functions are not async safe and
2395 // should be avoided.)
2396 //
2397 // Note: sigwait() is a more natural fit than sigsuspend() from an
2398 // interface point of view, but sigwait() prevents the signal hander
2399 // from being run. libpthread would get very confused by not having
2400 // its signal handlers run and prevents sigwait()'s use with the
2401 // mutex granting granting signal.
2402 //
2403 // Currently only ever called on the VMThread or JavaThread
2404 //
2405 #ifdef __APPLE__
2406 static OSXSemaphore sr_semaphore;
2407 #else
2408 static PosixSemaphore sr_semaphore;
2409 #endif
2410
2411 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2412 // Save and restore errno to avoid confusing native code with EINTR
2413 // after sigsuspend.
2414 int old_errno = errno;
2415
2416 Thread* thread = Thread::current_or_null_safe();
2417 assert(thread != NULL, "Missing current thread in SR_handler");
2418
2419 // On some systems we have seen signal delivery get "stuck" until the signal
2420 // mask is changed as part of thread termination. Check that the current thread
2421 // has not already terminated (via SR_lock()) - else the following assertion
2422 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2423 // destructor has completed.
2424
2425 if (thread->SR_lock() == NULL) {
2426 return;
2427 }
2428
2429 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2430
2431 OSThread* osthread = thread->osthread();
2432
2433 os::SuspendResume::State current = osthread->sr.state();
2434 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2435 suspend_save_context(osthread, siginfo, context);
2436
2437 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2438 os::SuspendResume::State state = osthread->sr.suspended();
2439 if (state == os::SuspendResume::SR_SUSPENDED) {
2440 sigset_t suspend_set; // signals for sigsuspend()
2441
2442 // get current set of blocked signals and unblock resume signal
2443 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2444 sigdelset(&suspend_set, SR_signum);
2445
2446 sr_semaphore.signal();
2447 // wait here until we are resumed
2448 while (1) {
2449 sigsuspend(&suspend_set);
2450
2451 os::SuspendResume::State result = osthread->sr.running();
2452 if (result == os::SuspendResume::SR_RUNNING) {
2453 sr_semaphore.signal();
2454 break;
2455 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2456 ShouldNotReachHere();
2457 }
2458 }
2459
2460 } else if (state == os::SuspendResume::SR_RUNNING) {
2461 // request was cancelled, continue
2462 } else {
2463 ShouldNotReachHere();
2464 }
2465
2466 resume_clear_context(osthread);
2467 } else if (current == os::SuspendResume::SR_RUNNING) {
2468 // request was cancelled, continue
2469 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2470 // ignore
2471 } else {
2472 // ignore
2473 }
2474
2475 errno = old_errno;
2476 }
2477
2478
2479 static int SR_initialize() {
2480 struct sigaction act;
2481 char *s;
2482 // Get signal number to use for suspend/resume
2483 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2484 int sig = ::strtol(s, 0, 10);
2485 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2486 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2487 SR_signum = sig;
2488 } else {
2489 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2490 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2491 }
2492 }
2493
2494 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2495 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2496
2497 sigemptyset(&SR_sigset);
2498 sigaddset(&SR_sigset, SR_signum);
2499
2500 // Set up signal handler for suspend/resume
2501 act.sa_flags = SA_RESTART|SA_SIGINFO;
2502 act.sa_handler = (void (*)(int)) SR_handler;
2503
2504 // SR_signum is blocked by default.
2505 // 4528190 - We also need to block pthread restart signal (32 on all
2506 // supported Bsd platforms). Note that BsdThreads need to block
2507 // this signal for all threads to work properly. So we don't have
2508 // to use hard-coded signal number when setting up the mask.
2509 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2510
2511 if (sigaction(SR_signum, &act, 0) == -1) {
2512 return -1;
2513 }
2514
2515 // Save signal flag
2516 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2517 return 0;
2518 }
2519
2520 static int sr_notify(OSThread* osthread) {
2521 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2522 assert_status(status == 0, status, "pthread_kill");
2523 return status;
2524 }
2525
2526 // "Randomly" selected value for how long we want to spin
2527 // before bailing out on suspending a thread, also how often
2528 // we send a signal to a thread we want to resume
2529 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2530 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2531
2532 // returns true on success and false on error - really an error is fatal
2533 // but this seems the normal response to library errors
2534 static bool do_suspend(OSThread* osthread) {
2535 assert(osthread->sr.is_running(), "thread should be running");
2536 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2537
2538 // mark as suspended and send signal
2539 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2540 // failed to switch, state wasn't running?
2541 ShouldNotReachHere();
2542 return false;
2543 }
2544
2545 if (sr_notify(osthread) != 0) {
2546 ShouldNotReachHere();
2547 }
2548
2549 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2550 while (true) {
2551 if (sr_semaphore.timedwait(2)) {
2552 break;
2553 } else {
2554 // timeout
2555 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2556 if (cancelled == os::SuspendResume::SR_RUNNING) {
2557 return false;
2558 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2559 // make sure that we consume the signal on the semaphore as well
2560 sr_semaphore.wait();
2561 break;
2562 } else {
2563 ShouldNotReachHere();
2564 return false;
2565 }
2566 }
2567 }
2568
2569 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2570 return true;
2571 }
2572
2573 static void do_resume(OSThread* osthread) {
2574 assert(osthread->sr.is_suspended(), "thread should be suspended");
2575 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2576
2577 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2578 // failed to switch to WAKEUP_REQUEST
2579 ShouldNotReachHere();
2580 return;
2581 }
2582
2583 while (true) {
2584 if (sr_notify(osthread) == 0) {
2585 if (sr_semaphore.timedwait(2)) {
2586 if (osthread->sr.is_running()) {
2587 return;
2588 }
2589 }
2590 } else {
2591 ShouldNotReachHere();
2592 }
2593 }
2594
2595 guarantee(osthread->sr.is_running(), "Must be running!");
2596 }
2597
2598 ///////////////////////////////////////////////////////////////////////////////////
2599 // signal handling (except suspend/resume)
2600
2601 // This routine may be used by user applications as a "hook" to catch signals.
2602 // The user-defined signal handler must pass unrecognized signals to this
2603 // routine, and if it returns true (non-zero), then the signal handler must
2604 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2605 // routine will never retun false (zero), but instead will execute a VM panic
2606 // routine kill the process.
2607 //
2608 // If this routine returns false, it is OK to call it again. This allows
2609 // the user-defined signal handler to perform checks either before or after
2610 // the VM performs its own checks. Naturally, the user code would be making
2611 // a serious error if it tried to handle an exception (such as a null check
2612 // or breakpoint) that the VM was generating for its own correct operation.
2613 //
2614 // This routine may recognize any of the following kinds of signals:
2615 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2616 // It should be consulted by handlers for any of those signals.
2617 //
2618 // The caller of this routine must pass in the three arguments supplied
2619 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2620 // field of the structure passed to sigaction(). This routine assumes that
2621 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2622 //
2623 // Note that the VM will print warnings if it detects conflicting signal
2624 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2625 //
2626 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2627 void* ucontext,
2628 int abort_if_unrecognized);
2629
2630 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2631 assert(info != NULL && uc != NULL, "it must be old kernel");
2632 int orig_errno = errno; // Preserve errno value over signal handler.
2633 JVM_handle_bsd_signal(sig, info, uc, true);
2634 errno = orig_errno;
2635 }
2636
2637
2638 // This boolean allows users to forward their own non-matching signals
2639 // to JVM_handle_bsd_signal, harmlessly.
2640 bool os::Bsd::signal_handlers_are_installed = false;
2641
2642 // For signal-chaining
2643 bool os::Bsd::libjsig_is_loaded = false;
2644 typedef struct sigaction *(*get_signal_t)(int);
2645 get_signal_t os::Bsd::get_signal_action = NULL;
2646
2647 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2648 struct sigaction *actp = NULL;
2649
2650 if (libjsig_is_loaded) {
2651 // Retrieve the old signal handler from libjsig
2652 actp = (*get_signal_action)(sig);
2653 }
2654 if (actp == NULL) {
2655 // Retrieve the preinstalled signal handler from jvm
2656 actp = os::Posix::get_preinstalled_handler(sig);
2657 }
2658
2659 return actp;
2660 }
2661
2662 static bool call_chained_handler(struct sigaction *actp, int sig,
2663 siginfo_t *siginfo, void *context) {
2664 // Call the old signal handler
2665 if (actp->sa_handler == SIG_DFL) {
2666 // It's more reasonable to let jvm treat it as an unexpected exception
2667 // instead of taking the default action.
2668 return false;
2669 } else if (actp->sa_handler != SIG_IGN) {
2670 if ((actp->sa_flags & SA_NODEFER) == 0) {
2671 // automaticlly block the signal
2672 sigaddset(&(actp->sa_mask), sig);
2673 }
2674
2675 sa_handler_t hand;
2676 sa_sigaction_t sa;
2677 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2678 // retrieve the chained handler
2679 if (siginfo_flag_set) {
2680 sa = actp->sa_sigaction;
2681 } else {
2682 hand = actp->sa_handler;
2683 }
2684
2685 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2686 actp->sa_handler = SIG_DFL;
2687 }
2688
2689 // try to honor the signal mask
2690 sigset_t oset;
2691 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2692
2693 // call into the chained handler
2694 if (siginfo_flag_set) {
2695 (*sa)(sig, siginfo, context);
2696 } else {
2697 (*hand)(sig);
2698 }
2699
2700 // restore the signal mask
2701 pthread_sigmask(SIG_SETMASK, &oset, 0);
2702 }
2703 // Tell jvm's signal handler the signal is taken care of.
2704 return true;
2705 }
2706
2707 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2708 bool chained = false;
2709 // signal-chaining
2710 if (UseSignalChaining) {
2711 struct sigaction *actp = get_chained_signal_action(sig);
2712 if (actp != NULL) {
2713 chained = call_chained_handler(actp, sig, siginfo, context);
2714 }
2715 }
2716 return chained;
2717 }
2718
2719 // for diagnostic
2720 int sigflags[NSIG];
2721
2722 int os::Bsd::get_our_sigflags(int sig) {
2723 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2724 return sigflags[sig];
2725 }
2726
2727 void os::Bsd::set_our_sigflags(int sig, int flags) {
2728 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2729 if (sig > 0 && sig < NSIG) {
2730 sigflags[sig] = flags;
2731 }
2732 }
2733
2734 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2735 // Check for overwrite.
2736 struct sigaction oldAct;
2737 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2738
2739 void* oldhand = oldAct.sa_sigaction
2740 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2741 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2742 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2743 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2744 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2745 if (AllowUserSignalHandlers || !set_installed) {
2746 // Do not overwrite; user takes responsibility to forward to us.
2747 return;
2748 } else if (UseSignalChaining) {
2749 // save the old handler in jvm
2750 os::Posix::save_preinstalled_handler(sig, oldAct);
2751 // libjsig also interposes the sigaction() call below and saves the
2752 // old sigaction on it own.
2753 } else {
2754 fatal("Encountered unexpected pre-existing sigaction handler "
2755 "%#lx for signal %d.", (long)oldhand, sig);
2756 }
2757 }
2758
2759 struct sigaction sigAct;
2760 sigfillset(&(sigAct.sa_mask));
2761 sigAct.sa_handler = SIG_DFL;
2762 if (!set_installed) {
2763 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2764 } else {
2765 sigAct.sa_sigaction = signalHandler;
2766 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2767 }
2768 #ifdef __APPLE__
2769 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2770 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2771 // if the signal handler declares it will handle it on alternate stack.
2772 // Notice we only declare we will handle it on alt stack, but we are not
2773 // actually going to use real alt stack - this is just a workaround.
2774 // Please see ux_exception.c, method catch_mach_exception_raise for details
2775 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2776 if (sig == SIGSEGV) {
2777 sigAct.sa_flags |= SA_ONSTACK;
2778 }
2779 #endif
2780
2781 // Save flags, which are set by ours
2782 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2783 sigflags[sig] = sigAct.sa_flags;
2784
2785 int ret = sigaction(sig, &sigAct, &oldAct);
2786 assert(ret == 0, "check");
2787
2788 void* oldhand2 = oldAct.sa_sigaction
2789 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2790 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2791 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2792 }
2793
2794 // install signal handlers for signals that HotSpot needs to
2795 // handle in order to support Java-level exception handling.
2796
2797 void os::Bsd::install_signal_handlers() {
2798 if (!signal_handlers_are_installed) {
2799 signal_handlers_are_installed = true;
2800
2801 // signal-chaining
2802 typedef void (*signal_setting_t)();
2803 signal_setting_t begin_signal_setting = NULL;
2804 signal_setting_t end_signal_setting = NULL;
2805 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2806 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2807 if (begin_signal_setting != NULL) {
2808 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2809 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2810 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2811 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2812 libjsig_is_loaded = true;
2813 assert(UseSignalChaining, "should enable signal-chaining");
2814 }
2815 if (libjsig_is_loaded) {
2816 // Tell libjsig jvm is setting signal handlers
2817 (*begin_signal_setting)();
2818 }
2819
2820 set_signal_handler(SIGSEGV, true);
2821 set_signal_handler(SIGPIPE, true);
2822 set_signal_handler(SIGBUS, true);
2823 set_signal_handler(SIGILL, true);
2824 set_signal_handler(SIGFPE, true);
2825 set_signal_handler(SIGXFSZ, true);
2826
2827 #if defined(__APPLE__)
2828 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2829 // signals caught and handled by the JVM. To work around this, we reset the mach task
2830 // signal handler that's placed on our process by CrashReporter. This disables
2831 // CrashReporter-based reporting.
2832 //
2833 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2834 // on caught fatal signals.
2835 //
2836 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2837 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2838 // exception handling, while leaving the standard BSD signal handlers functional.
2839 kern_return_t kr;
2840 kr = task_set_exception_ports(mach_task_self(),
2841 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2842 MACH_PORT_NULL,
2843 EXCEPTION_STATE_IDENTITY,
2844 MACHINE_THREAD_STATE);
2845
2846 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2847 #endif
2848
2849 if (libjsig_is_loaded) {
2850 // Tell libjsig jvm finishes setting signal handlers
2851 (*end_signal_setting)();
2852 }
2853
2854 // We don't activate signal checker if libjsig is in place, we trust ourselves
2855 // and if UserSignalHandler is installed all bets are off
2856 if (CheckJNICalls) {
2857 if (libjsig_is_loaded) {
2858 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
2859 check_signals = false;
2860 }
2861 if (AllowUserSignalHandlers) {
2862 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2863 check_signals = false;
2864 }
2865 }
2866 }
2867 }
2868
2869
2870 /////
2871 // glibc on Bsd platform uses non-documented flag
2872 // to indicate, that some special sort of signal
2873 // trampoline is used.
2874 // We will never set this flag, and we should
2875 // ignore this flag in our diagnostic
2876 #ifdef SIGNIFICANT_SIGNAL_MASK
2877 #undef SIGNIFICANT_SIGNAL_MASK
2878 #endif
2879 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2880
2881 static const char* get_signal_handler_name(address handler,
2882 char* buf, int buflen) {
2883 int offset;
2884 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2885 if (found) {
2886 // skip directory names
2887 const char *p1, *p2;
2888 p1 = buf;
2889 size_t len = strlen(os::file_separator());
2890 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2891 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2892 } else {
2893 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2894 }
2895 return buf;
2896 }
2897
2898 static void print_signal_handler(outputStream* st, int sig,
2899 char* buf, size_t buflen) {
2900 struct sigaction sa;
2901
2902 sigaction(sig, NULL, &sa);
2903
2904 // See comment for SIGNIFICANT_SIGNAL_MASK define
2905 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2906
2907 st->print("%s: ", os::exception_name(sig, buf, buflen));
2908
2909 address handler = (sa.sa_flags & SA_SIGINFO)
2910 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2911 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2912
2913 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2914 st->print("SIG_DFL");
2915 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2916 st->print("SIG_IGN");
2917 } else {
2918 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2919 }
2920
2921 st->print(", sa_mask[0]=");
2922 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2923
2924 address rh = VMError::get_resetted_sighandler(sig);
2925 // May be, handler was resetted by VMError?
2926 if (rh != NULL) {
2927 handler = rh;
2928 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2929 }
2930
2931 st->print(", sa_flags=");
2932 os::Posix::print_sa_flags(st, sa.sa_flags);
2933
2934 // Check: is it our handler?
2935 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2936 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2937 // It is our signal handler
2938 // check for flags, reset system-used one!
2939 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2940 st->print(
2941 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2942 os::Bsd::get_our_sigflags(sig));
2943 }
2944 }
2945 st->cr();
2946 }
2947
2948
2949 #define DO_SIGNAL_CHECK(sig) \
2950 do { \
2951 if (!sigismember(&check_signal_done, sig)) { \
2952 os::Bsd::check_signal_handler(sig); \
2953 } \
2954 } while (0)
2955
2956 // This method is a periodic task to check for misbehaving JNI applications
2957 // under CheckJNI, we can add any periodic checks here
2958
2959 void os::run_periodic_checks() {
2960
2961 if (check_signals == false) return;
2962
2963 // SEGV and BUS if overridden could potentially prevent
2964 // generation of hs*.log in the event of a crash, debugging
2965 // such a case can be very challenging, so we absolutely
2966 // check the following for a good measure:
2967 DO_SIGNAL_CHECK(SIGSEGV);
2968 DO_SIGNAL_CHECK(SIGILL);
2969 DO_SIGNAL_CHECK(SIGFPE);
2970 DO_SIGNAL_CHECK(SIGBUS);
2971 DO_SIGNAL_CHECK(SIGPIPE);
2972 DO_SIGNAL_CHECK(SIGXFSZ);
2973
2974
2975 // ReduceSignalUsage allows the user to override these handlers
2976 // see comments at the very top and jvm_md.h
2977 if (!ReduceSignalUsage) {
2978 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
2979 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
2980 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
2981 DO_SIGNAL_CHECK(BREAK_SIGNAL);
2982 }
2983
2984 DO_SIGNAL_CHECK(SR_signum);
2985 }
2986
2987 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
2988
2989 static os_sigaction_t os_sigaction = NULL;
2990
2991 void os::Bsd::check_signal_handler(int sig) {
2992 char buf[O_BUFLEN];
2993 address jvmHandler = NULL;
2994
2995
2996 struct sigaction act;
2997 if (os_sigaction == NULL) {
2998 // only trust the default sigaction, in case it has been interposed
2999 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3000 if (os_sigaction == NULL) return;
3001 }
3002
3003 os_sigaction(sig, (struct sigaction*)NULL, &act);
3004
3005
3006 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3007
3008 address thisHandler = (act.sa_flags & SA_SIGINFO)
3009 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3010 : CAST_FROM_FN_PTR(address, act.sa_handler);
3011
3012
3013 switch (sig) {
3014 case SIGSEGV:
3015 case SIGBUS:
3016 case SIGFPE:
3017 case SIGPIPE:
3018 case SIGILL:
3019 case SIGXFSZ:
3020 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3021 break;
3022
3023 case SHUTDOWN1_SIGNAL:
3024 case SHUTDOWN2_SIGNAL:
3025 case SHUTDOWN3_SIGNAL:
3026 case BREAK_SIGNAL:
3027 jvmHandler = (address)user_handler();
3028 break;
3029
3030 default:
3031 if (sig == SR_signum) {
3032 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3033 } else {
3034 return;
3035 }
3036 break;
3037 }
3038
3039 if (thisHandler != jvmHandler) {
3040 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3041 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3042 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3043 // No need to check this sig any longer
3044 sigaddset(&check_signal_done, sig);
3045 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3046 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3047 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3048 exception_name(sig, buf, O_BUFLEN));
3049 }
3050 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3051 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3052 tty->print("expected:");
3053 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3054 tty->cr();
3055 tty->print(" found:");
3056 os::Posix::print_sa_flags(tty, act.sa_flags);
3057 tty->cr();
3058 // No need to check this sig any longer
3059 sigaddset(&check_signal_done, sig);
3060 }
3061
3062 // Dump all the signal
3063 if (sigismember(&check_signal_done, sig)) {
3064 print_signal_handlers(tty, buf, O_BUFLEN);
3065 }
3066 }
3067
3068 extern void report_error(char* file_name, int line_no, char* title,
3069 char* format, ...);
3070
3071 // this is called _before_ the most of global arguments have been parsed
3072 void os::init(void) {
3073 char dummy; // used to get a guess on initial stack address
3074
3075 clock_tics_per_sec = CLK_TCK;
3076
3077 init_random(1234567);
3078
3079 Bsd::set_page_size(getpagesize());
3080 if (Bsd::page_size() == -1) {
3081 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3082 }
3083 init_page_sizes((size_t) Bsd::page_size());
3084
3085 Bsd::initialize_system_info();
3086
3087 // _main_thread points to the thread that created/loaded the JVM.
3088 Bsd::_main_thread = pthread_self();
3089
3090 Bsd::clock_init();
3091 initial_time_count = javaTimeNanos();
3092
3093 os::Posix::init();
3094 }
3095
3096 // To install functions for atexit system call
3097 extern "C" {
3098 static void perfMemory_exit_helper() {
3099 perfMemory_exit();
3100 }
3101 }
3102
3103 // this is called _after_ the global arguments have been parsed
3104 jint os::init_2(void) {
3105
3106 // This could be set after os::Posix::init() but all platforms
3107 // have to set it the same so we have to mirror Solaris.
3108 DEBUG_ONLY(os::set_mutex_init_done();)
3109
3110 os::Posix::init_2();
3111
3112 // initialize suspend/resume support - must do this before signal_sets_init()
3113 if (SR_initialize() != 0) {
3114 perror("SR_initialize failed");
3115 return JNI_ERR;
3116 }
3117
3118 Bsd::signal_sets_init();
3119 Bsd::install_signal_handlers();
3120 // Initialize data for jdk.internal.misc.Signal
3121 if (!ReduceSignalUsage) {
3122 jdk_misc_signal_init();
3123 }
3124
3125 // Check and sets minimum stack sizes against command line options
3126 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3127 return JNI_ERR;
3128 }
3129
3130 if (MaxFDLimit) {
3131 // set the number of file descriptors to max. print out error
3132 // if getrlimit/setrlimit fails but continue regardless.
3133 struct rlimit nbr_files;
3134 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3135 if (status != 0) {
3136 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3137 } else {
3138 nbr_files.rlim_cur = nbr_files.rlim_max;
3139
3140 #ifdef __APPLE__
3141 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3142 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3143 // be used instead
3144 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3145 #endif
3146
3147 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3148 if (status != 0) {
3149 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3150 }
3151 }
3152 }
3153
3154 // at-exit methods are called in the reverse order of their registration.
3155 // atexit functions are called on return from main or as a result of a
3156 // call to exit(3C). There can be only 32 of these functions registered
3157 // and atexit() does not set errno.
3158
3159 if (PerfAllowAtExitRegistration) {
3160 // only register atexit functions if PerfAllowAtExitRegistration is set.
3161 // atexit functions can be delayed until process exit time, which
3162 // can be problematic for embedded VM situations. Embedded VMs should
3163 // call DestroyJavaVM() to assure that VM resources are released.
3164
3165 // note: perfMemory_exit_helper atexit function may be removed in
3166 // the future if the appropriate cleanup code can be added to the
3167 // VM_Exit VMOperation's doit method.
3168 if (atexit(perfMemory_exit_helper) != 0) {
3169 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3170 }
3171 }
3172
3173 // initialize thread priority policy
3174 prio_init();
3175
3176 #ifdef __APPLE__
3177 // dynamically link to objective c gc registration
3178 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3179 if (handleLibObjc != NULL) {
3180 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3181 }
3182 #endif
3183
3184 return JNI_OK;
3185 }
3186
3187 int os::active_processor_count() {
3188 // User has overridden the number of active processors
3189 if (ActiveProcessorCount > 0) {
3190 log_trace(os)("active_processor_count: "
3191 "active processor count set by user : %d",
3192 ActiveProcessorCount);
3193 return ActiveProcessorCount;
3194 }
3195
3196 return _processor_count;
3197 }
3198
3199 #ifdef __APPLE__
3200 uint os::processor_id() {
3201 // Get the initial APIC id and return the associated processor id. The initial APIC
3202 // id is limited to 8-bits, which means we can have at most 256 unique APIC ids. If
3203 // the system has more processors (or the initial APIC ids are discontiguous) the
3204 // APIC id will be truncated and more than one processor will potentially share the
3205 // same processor id. This is not optimal, but unlikely to happen in practice. Should
3206 // this become a real problem we could switch to using x2APIC ids, which are 32-bit
3207 // wide. However, note that x2APIC is Intel-specific, and the wider number space
3208 // would require a more complicated mapping approach.
3209 uint eax = 0x1;
3210 uint ebx;
3211 uint ecx = 0;
3212 uint edx;
3213
3214 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3215
3216 uint apic_id = (ebx >> 24) & (processor_id_map_size - 1);
3217 int processor_id = Atomic::load(&processor_id_map[apic_id]);
3218
3219 while (processor_id < 0) {
3220 // Assign processor id to APIC id
3221 processor_id = Atomic::cmpxchg(&processor_id_map[apic_id], processor_id_unassigned, processor_id_assigning);
3222 if (processor_id == processor_id_unassigned) {
3223 processor_id = Atomic::fetch_and_add(&processor_id_next, 1) % os::processor_count();
3224 Atomic::store(&processor_id_map[apic_id], processor_id);
3225 }
3226 }
3227
3228 assert(processor_id >= 0 && processor_id < os::processor_count(), "invalid processor id");
3229
3230 return (uint)processor_id;
3231 }
3232 #endif
3233
3234 void os::set_native_thread_name(const char *name) {
3235 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3236 // This is only supported in Snow Leopard and beyond
3237 if (name != NULL) {
3238 // Add a "Java: " prefix to the name
3239 char buf[MAXTHREADNAMESIZE];
3240 snprintf(buf, sizeof(buf), "Java: %s", name);
3241 pthread_setname_np(buf);
3242 }
3243 #endif
3244 }
3245
3246 bool os::bind_to_processor(uint processor_id) {
3247 // Not yet implemented.
3248 return false;
3249 }
3250
3251 void os::SuspendedThreadTask::internal_do_task() {
3252 if (do_suspend(_thread->osthread())) {
3253 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3254 do_task(context);
3255 do_resume(_thread->osthread());
3256 }
3257 }
3258
3259 ////////////////////////////////////////////////////////////////////////////////
3260 // debug support
3261
3262 bool os::find(address addr, outputStream* st) {
3263 Dl_info dlinfo;
3264 memset(&dlinfo, 0, sizeof(dlinfo));
3265 if (dladdr(addr, &dlinfo) != 0) {
3266 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3267 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3268 st->print("%s+%#x", dlinfo.dli_sname,
3269 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3270 } else if (dlinfo.dli_fbase != NULL) {
3271 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3272 } else {
3273 st->print("<absolute address>");
3274 }
3275 if (dlinfo.dli_fname != NULL) {
3276 st->print(" in %s", dlinfo.dli_fname);
3277 }
3278 if (dlinfo.dli_fbase != NULL) {
3279 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3280 }
3281 st->cr();
3282
3283 if (Verbose) {
3284 // decode some bytes around the PC
3285 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3286 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3287 address lowest = (address) dlinfo.dli_sname;
3288 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3289 if (begin < lowest) begin = lowest;
3290 Dl_info dlinfo2;
3291 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3292 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3293 end = (address) dlinfo2.dli_saddr;
3294 }
3295 Disassembler::decode(begin, end, st);
3296 }
3297 return true;
3298 }
3299 return false;
3300 }
3301
3302 ////////////////////////////////////////////////////////////////////////////////
3303 // misc
3304
3305 // This does not do anything on Bsd. This is basically a hook for being
3306 // able to use structured exception handling (thread-local exception filters)
3307 // on, e.g., Win32.
3308 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3309 const methodHandle& method, JavaCallArguments* args,
3310 Thread* thread) {
3311 f(value, method, args, thread);
3312 }
3313
3314 void os::print_statistics() {
3315 }
3316
3317 bool os::message_box(const char* title, const char* message) {
3318 int i;
3319 fdStream err(defaultStream::error_fd());
3320 for (i = 0; i < 78; i++) err.print_raw("=");
3321 err.cr();
3322 err.print_raw_cr(title);
3323 for (i = 0; i < 78; i++) err.print_raw("-");
3324 err.cr();
3325 err.print_raw_cr(message);
3326 for (i = 0; i < 78; i++) err.print_raw("=");
3327 err.cr();
3328
3329 char buf[16];
3330 // Prevent process from exiting upon "read error" without consuming all CPU
3331 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3332
3333 return buf[0] == 'y' || buf[0] == 'Y';
3334 }
3335
3336 static inline struct timespec get_mtime(const char* filename) {
3337 struct stat st;
3338 int ret = os::stat(filename, &st);
3339 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3340 #ifdef __APPLE__
3341 return st.st_mtimespec;
3342 #else
3343 return st.st_mtim;
3344 #endif
3345 }
3346
3347 int os::compare_file_modified_times(const char* file1, const char* file2) {
3348 struct timespec filetime1 = get_mtime(file1);
3349 struct timespec filetime2 = get_mtime(file2);
3350 int diff = filetime1.tv_sec - filetime2.tv_sec;
3351 if (diff == 0) {
3352 return filetime1.tv_nsec - filetime2.tv_nsec;
3353 }
3354 return diff;
3355 }
3356
3357 // Is a (classpath) directory empty?
3358 bool os::dir_is_empty(const char* path) {
3359 DIR *dir = NULL;
3360 struct dirent *ptr;
3361
3362 dir = opendir(path);
3363 if (dir == NULL) return true;
3364
3365 // Scan the directory
3366 bool result = true;
3367 while (result && (ptr = readdir(dir)) != NULL) {
3368 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3369 result = false;
3370 }
3371 }
3372 closedir(dir);
3373 return result;
3374 }
3375
3376 // This code originates from JDK's sysOpen and open64_w
3377 // from src/solaris/hpi/src/system_md.c
3378
3379 int os::open(const char *path, int oflag, int mode) {
3380 if (strlen(path) > MAX_PATH - 1) {
3381 errno = ENAMETOOLONG;
3382 return -1;
3383 }
3384 int fd;
3385
3386 fd = ::open(path, oflag, mode);
3387 if (fd == -1) return -1;
3388
3389 // If the open succeeded, the file might still be a directory
3390 {
3391 struct stat buf;
3392 int ret = ::fstat(fd, &buf);
3393 int st_mode = buf.st_mode;
3394
3395 if (ret != -1) {
3396 if ((st_mode & S_IFMT) == S_IFDIR) {
3397 errno = EISDIR;
3398 ::close(fd);
3399 return -1;
3400 }
3401 } else {
3402 ::close(fd);
3403 return -1;
3404 }
3405 }
3406
3407 // All file descriptors that are opened in the JVM and not
3408 // specifically destined for a subprocess should have the
3409 // close-on-exec flag set. If we don't set it, then careless 3rd
3410 // party native code might fork and exec without closing all
3411 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3412 // UNIXProcess.c), and this in turn might:
3413 //
3414 // - cause end-of-file to fail to be detected on some file
3415 // descriptors, resulting in mysterious hangs, or
3416 //
3417 // - might cause an fopen in the subprocess to fail on a system
3418 // suffering from bug 1085341.
3419 //
3420 // (Yes, the default setting of the close-on-exec flag is a Unix
3421 // design flaw)
3422 //
3423 // See:
3424 // 1085341: 32-bit stdio routines should support file descriptors >255
3425 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3426 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3427 //
3428 #ifdef FD_CLOEXEC
3429 {
3430 int flags = ::fcntl(fd, F_GETFD);
3431 if (flags != -1) {
3432 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3433 }
3434 }
3435 #endif
3436
3437 return fd;
3438 }
3439
3440
3441 // create binary file, rewriting existing file if required
3442 int os::create_binary_file(const char* path, bool rewrite_existing) {
3443 int oflags = O_WRONLY | O_CREAT;
3444 if (!rewrite_existing) {
3445 oflags |= O_EXCL;
3446 }
3447 return ::open(path, oflags, S_IREAD | S_IWRITE);
3448 }
3449
3450 // return current position of file pointer
3451 jlong os::current_file_offset(int fd) {
3452 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3453 }
3454
3455 // move file pointer to the specified offset
3456 jlong os::seek_to_file_offset(int fd, jlong offset) {
3457 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3458 }
3459
3460 // This code originates from JDK's sysAvailable
3461 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3462
3463 int os::available(int fd, jlong *bytes) {
3464 jlong cur, end;
3465 int mode;
3466 struct stat buf;
3467
3468 if (::fstat(fd, &buf) >= 0) {
3469 mode = buf.st_mode;
3470 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3471 int n;
3472 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3473 *bytes = n;
3474 return 1;
3475 }
3476 }
3477 }
3478 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3479 return 0;
3480 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3481 return 0;
3482 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3483 return 0;
3484 }
3485 *bytes = end - cur;
3486 return 1;
3487 }
3488
3489 // Map a block of memory.
3490 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3491 char *addr, size_t bytes, bool read_only,
3492 bool allow_exec) {
3493 int prot;
3494 int flags;
3495
3496 if (read_only) {
3497 prot = PROT_READ;
3498 flags = MAP_SHARED;
3499 } else {
3500 prot = PROT_READ | PROT_WRITE;
3501 flags = MAP_PRIVATE;
3502 }
3503
3504 if (allow_exec) {
3505 prot |= PROT_EXEC;
3506 }
3507
3508 if (addr != NULL) {
3509 flags |= MAP_FIXED;
3510 }
3511
3512 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3513 fd, file_offset);
3514 if (mapped_address == MAP_FAILED) {
3515 return NULL;
3516 }
3517 return mapped_address;
3518 }
3519
3520
3521 // Remap a block of memory.
3522 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3523 char *addr, size_t bytes, bool read_only,
3524 bool allow_exec) {
3525 // same as map_memory() on this OS
3526 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3527 allow_exec);
3528 }
3529
3530
3531 // Unmap a block of memory.
3532 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3533 return munmap(addr, bytes) == 0;
3534 }
3535
3536 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3537 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3538 // of a thread.
3539 //
3540 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3541 // the fast estimate available on the platform.
3542
3543 jlong os::current_thread_cpu_time() {
3544 #ifdef __APPLE__
3545 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3546 #else
3547 Unimplemented();
3548 return 0;
3549 #endif
3550 }
3551
3552 jlong os::thread_cpu_time(Thread* thread) {
3553 #ifdef __APPLE__
3554 return os::thread_cpu_time(thread, true /* user + sys */);
3555 #else
3556 Unimplemented();
3557 return 0;
3558 #endif
3559 }
3560
3561 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3562 #ifdef __APPLE__
3563 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3564 #else
3565 Unimplemented();
3566 return 0;
3567 #endif
3568 }
3569
3570 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3571 #ifdef __APPLE__
3572 struct thread_basic_info tinfo;
3573 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3574 kern_return_t kr;
3575 thread_t mach_thread;
3576
3577 mach_thread = thread->osthread()->thread_id();
3578 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3579 if (kr != KERN_SUCCESS) {
3580 return -1;
3581 }
3582
3583 if (user_sys_cpu_time) {
3584 jlong nanos;
3585 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3586 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3587 return nanos;
3588 } else {
3589 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3590 }
3591 #else
3592 Unimplemented();
3593 return 0;
3594 #endif
3595 }
3596
3597
3598 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3599 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3600 info_ptr->may_skip_backward = false; // elapsed time not wall time
3601 info_ptr->may_skip_forward = false; // elapsed time not wall time
3602 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3603 }
3604
3605 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3606 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3607 info_ptr->may_skip_backward = false; // elapsed time not wall time
3608 info_ptr->may_skip_forward = false; // elapsed time not wall time
3609 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3610 }
3611
3612 bool os::is_thread_cpu_time_supported() {
3613 #ifdef __APPLE__
3614 return true;
3615 #else
3616 return false;
3617 #endif
3618 }
3619
3620 // System loadavg support. Returns -1 if load average cannot be obtained.
3621 // Bsd doesn't yet have a (official) notion of processor sets,
3622 // so just return the system wide load average.
3623 int os::loadavg(double loadavg[], int nelem) {
3624 return ::getloadavg(loadavg, nelem);
3625 }
3626
3627 void os::pause() {
3628 char filename[MAX_PATH];
3629 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3630 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
3631 } else {
3632 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3633 }
3634
3635 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3636 if (fd != -1) {
3637 struct stat buf;
3638 ::close(fd);
3639 while (::stat(filename, &buf) == 0) {
3640 (void)::poll(NULL, 0, 100);
3641 }
3642 } else {
3643 jio_fprintf(stderr,
3644 "Could not open pause file '%s', continuing immediately.\n", filename);
3645 }
3646 }
3647
3648 // Darwin has no "environ" in a dynamic library.
3649 #ifdef __APPLE__
3650 #include <crt_externs.h>
3651 #define environ (*_NSGetEnviron())
3652 #else
3653 extern char** environ;
3654 #endif
3655
3656 // Run the specified command in a separate process. Return its exit value,
3657 // or -1 on failure (e.g. can't fork a new process).
3658 // Unlike system(), this function can be called from signal handler. It
3659 // doesn't block SIGINT et al.
3660 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3661 const char * argv[4] = {"sh", "-c", cmd, NULL};
3662
3663 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3664 // pthread_atfork handlers and reset pthread library. All we need is a
3665 // separate process to execve. Make a direct syscall to fork process.
3666 // On IA64 there's no fork syscall, we have to use fork() and hope for
3667 // the best...
3668 pid_t pid = fork();
3669
3670 if (pid < 0) {
3671 // fork failed
3672 return -1;
3673
3674 } else if (pid == 0) {
3675 // child process
3676
3677 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3678 // first to kill every thread on the thread list. Because this list is
3679 // not reset by fork() (see notes above), execve() will instead kill
3680 // every thread in the parent process. We know this is the only thread
3681 // in the new process, so make a system call directly.
3682 // IA64 should use normal execve() from glibc to match the glibc fork()
3683 // above.
3684 execve("/bin/sh", (char* const*)argv, environ);
3685
3686 // execve failed
3687 _exit(-1);
3688
3689 } else {
3690 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3691 // care about the actual exit code, for now.
3692
3693 int status;
3694
3695 // Wait for the child process to exit. This returns immediately if
3696 // the child has already exited. */
3697 while (waitpid(pid, &status, 0) < 0) {
3698 switch (errno) {
3699 case ECHILD: return 0;
3700 case EINTR: break;
3701 default: return -1;
3702 }
3703 }
3704
3705 if (WIFEXITED(status)) {
3706 // The child exited normally; get its exit code.
3707 return WEXITSTATUS(status);
3708 } else if (WIFSIGNALED(status)) {
3709 // The child exited because of a signal
3710 // The best value to return is 0x80 + signal number,
3711 // because that is what all Unix shells do, and because
3712 // it allows callers to distinguish between process exit and
3713 // process death by signal.
3714 return 0x80 + WTERMSIG(status);
3715 } else {
3716 // Unknown exit code; pass it through
3717 return status;
3718 }
3719 }
3720 }
3721
3722 // Get the kern.corefile setting, or otherwise the default path to the core file
3723 // Returns the length of the string
3724 int os::get_core_path(char* buffer, size_t bufferSize) {
3725 int n = 0;
3726 #ifdef __APPLE__
3727 char coreinfo[MAX_PATH];
3728 size_t sz = sizeof(coreinfo);
3729 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0);
3730 if (ret == 0) {
3731 char *pid_pos = strstr(coreinfo, "%P");
3732 // skip over the "%P" to preserve any optional custom user pattern
3733 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : "";
3734
3735 if (pid_pos != NULL) {
3736 *pid_pos = '\0';
3737 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail);
3738 } else {
3739 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo);
3740 }
3741 } else
3742 #endif
3743 {
3744 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id());
3745 }
3746 // Truncate if theoretical string was longer than bufferSize
3747 n = MIN2(n, (int)bufferSize);
3748
3749 return n;
3750 }
3751
3752 bool os::supports_map_sync() {
3753 return false;
3754 }
3755
3756 #ifndef PRODUCT
3757 void TestReserveMemorySpecial_test() {
3758 // No tests available for this platform
3759 }
3760 #endif
3761
3762 bool os::start_debugging(char *buf, int buflen) {
3763 int len = (int)strlen(buf);
3764 char *p = &buf[len];
3765
3766 jio_snprintf(p, buflen-len,
3767 "\n\n"
3768 "Do you want to debug the problem?\n\n"
3769 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3770 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3771 "Otherwise, press RETURN to abort...",
3772 os::current_process_id(), os::current_process_id(),
3773 os::current_thread_id(), os::current_thread_id());
3774
3775 bool yes = os::message_box("Unexpected Error", buf);
3776
3777 if (yes) {
3778 // yes, user asked VM to launch debugger
3779 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3780 os::current_process_id(), os::current_process_id());
3781
3782 os::fork_and_exec(buf);
3783 yes = false;
3784 }
3785 return yes;
3786 }