1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "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/orderAccess.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/semaphore.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/statSampler.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/threadCritical.hpp"
63 #include "runtime/timer.hpp"
64 #include "services/attachListener.hpp"
65 #include "services/memTracker.hpp"
66 #include "services/runtimeService.hpp"
67 #include "utilities/align.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/vmError.hpp"
73
74 // put OS-includes here
75 # include <dlfcn.h>
76 # include <errno.h>
77 # include <fcntl.h>
78 # include <inttypes.h>
79 # include <poll.h>
80 # include <pthread.h>
81 # include <pwd.h>
82 # include <signal.h>
83 # include <stdint.h>
84 # include <stdio.h>
85 # include <string.h>
86 # include <sys/ioctl.h>
87 # include <sys/mman.h>
88 # include <sys/param.h>
89 # include <sys/resource.h>
90 # include <sys/socket.h>
91 # include <sys/stat.h>
92 # include <sys/syscall.h>
93 # include <sys/sysctl.h>
94 # include <sys/time.h>
95 # include <sys/times.h>
96 # include <sys/types.h>
97 # include <sys/wait.h>
98 # include <time.h>
99 # include <unistd.h>
100
101 #if defined(__FreeBSD__) || defined(__NetBSD__)
102 #include <elf.h>
103 #endif
104
105 #ifdef __APPLE__
106 #include <mach-o/dyld.h>
107 #endif
108
109 #ifndef MAP_ANONYMOUS
110 #define MAP_ANONYMOUS MAP_ANON
111 #endif
112
113 #define MAX_PATH (2 * K)
114
115 // for timer info max values which include all bits
116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
117
118 ////////////////////////////////////////////////////////////////////////////////
119 // global variables
120 julong os::Bsd::_physical_memory = 0;
121
122 #ifdef __APPLE__
123 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
124 volatile uint64_t os::Bsd::_max_abstime = 0;
125 #else
126 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
127 #endif
128 pthread_t os::Bsd::_main_thread;
129 int os::Bsd::_page_size = -1;
130
131 static jlong initial_time_count=0;
132
133 static int clock_tics_per_sec = 100;
134
135 // For diagnostics to print a message once. see run_periodic_checks
136 static sigset_t check_signal_done;
137 static bool check_signals = true;
138
139 // Signal number used to suspend/resume a thread
140
141 // do not use any signal number less than SIGSEGV, see 4355769
142 static int SR_signum = SIGUSR2;
143 sigset_t SR_sigset;
144
145
146 ////////////////////////////////////////////////////////////////////////////////
147 // utility functions
148
149 static int SR_initialize();
150
151 julong os::available_memory() {
152 return Bsd::available_memory();
153 }
154
155 // available here means free
156 julong os::Bsd::available_memory() {
157 uint64_t available = physical_memory() >> 2;
158 #ifdef __APPLE__
159 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
160 vm_statistics64_data_t vmstat;
161 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
162 (host_info64_t)&vmstat, &count);
163 assert(kerr == KERN_SUCCESS,
164 "host_statistics64 failed - check mach_host_self() and count");
165 if (kerr == KERN_SUCCESS) {
166 available = vmstat.free_count * os::vm_page_size();
167 }
168 #endif
169 return available;
170 }
171
172 julong os::physical_memory() {
173 return Bsd::physical_memory();
174 }
175
176 // Return true if user is running as root.
177
178 bool os::have_special_privileges() {
179 static bool init = false;
180 static bool privileges = false;
181 if (!init) {
182 privileges = (getuid() != geteuid()) || (getgid() != getegid());
183 init = true;
184 }
185 return privileges;
186 }
187
188
189
190 // Cpu architecture string
191 #if defined(ZERO)
192 static char cpu_arch[] = ZERO_LIBARCH;
193 #elif defined(IA64)
194 static char cpu_arch[] = "ia64";
195 #elif defined(IA32)
196 static char cpu_arch[] = "i386";
197 #elif defined(AMD64)
198 static char cpu_arch[] = "amd64";
199 #elif defined(ARM)
200 static char cpu_arch[] = "arm";
201 #elif defined(PPC32)
202 static char cpu_arch[] = "ppc";
203 #elif defined(SPARC)
204 #ifdef _LP64
205 static char cpu_arch[] = "sparcv9";
206 #else
207 static char cpu_arch[] = "sparc";
208 #endif
209 #else
210 #error Add appropriate cpu_arch setting
211 #endif
212
213 // Compiler variant
214 #ifdef COMPILER2
215 #define COMPILER_VARIANT "server"
216 #else
217 #define COMPILER_VARIANT "client"
218 #endif
219
220
221 void os::Bsd::initialize_system_info() {
222 int mib[2];
223 size_t len;
224 int cpu_val;
225 julong mem_val;
226
227 // get processors count via hw.ncpus sysctl
228 mib[0] = CTL_HW;
229 mib[1] = HW_NCPU;
230 len = sizeof(cpu_val);
231 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
232 assert(len == sizeof(cpu_val), "unexpected data size");
233 set_processor_count(cpu_val);
234 } else {
235 set_processor_count(1); // fallback
236 }
237
238 // get physical memory via hw.memsize sysctl (hw.memsize is used
239 // since it returns a 64 bit value)
240 mib[0] = CTL_HW;
241
242 #if defined (HW_MEMSIZE) // Apple
243 mib[1] = HW_MEMSIZE;
244 #elif defined(HW_PHYSMEM) // Most of BSD
245 mib[1] = HW_PHYSMEM;
246 #elif defined(HW_REALMEM) // Old FreeBSD
247 mib[1] = HW_REALMEM;
248 #else
249 #error No ways to get physmem
250 #endif
251
252 len = sizeof(mem_val);
253 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
254 assert(len == sizeof(mem_val), "unexpected data size");
255 _physical_memory = mem_val;
256 } else {
257 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
258 }
259
260 #ifdef __OpenBSD__
261 {
262 // limit _physical_memory memory view on OpenBSD since
263 // datasize rlimit restricts us anyway.
264 struct rlimit limits;
265 getrlimit(RLIMIT_DATA, &limits);
266 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
267 }
268 #endif
269 }
270
271 #ifdef __APPLE__
272 static const char *get_home() {
273 const char *home_dir = ::getenv("HOME");
274 if ((home_dir == NULL) || (*home_dir == '\0')) {
275 struct passwd *passwd_info = getpwuid(geteuid());
276 if (passwd_info != NULL) {
277 home_dir = passwd_info->pw_dir;
278 }
279 }
280
281 return home_dir;
282 }
283 #endif
284
285 void os::init_system_properties_values() {
286 // The next steps are taken in the product version:
287 //
288 // Obtain the JAVA_HOME value from the location of libjvm.so.
289 // This library should be located at:
290 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
291 //
292 // If "/jre/lib/" appears at the right place in the path, then we
293 // assume libjvm.so is installed in a JDK and we use this path.
294 //
295 // Otherwise exit with message: "Could not create the Java virtual machine."
296 //
297 // The following extra steps are taken in the debugging version:
298 //
299 // If "/jre/lib/" does NOT appear at the right place in the path
300 // instead of exit check for $JAVA_HOME environment variable.
301 //
302 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
303 // then we append a fake suffix "hotspot/libjvm.so" to this path so
304 // it looks like libjvm.so is installed there
305 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
306 //
307 // Otherwise exit.
308 //
309 // Important note: if the location of libjvm.so changes this
310 // code needs to be changed accordingly.
311
312 // See ld(1):
313 // The linker uses the following search paths to locate required
314 // shared libraries:
315 // 1: ...
316 // ...
317 // 7: The default directories, normally /lib and /usr/lib.
318 #ifndef DEFAULT_LIBPATH
319 #ifndef OVERRIDE_LIBPATH
320 #define DEFAULT_LIBPATH "/lib:/usr/lib"
321 #else
322 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
323 #endif
324 #endif
325
326 // Base path of extensions installed on the system.
327 #define SYS_EXT_DIR "/usr/java/packages"
328 #define EXTENSIONS_DIR "/lib/ext"
329
330 #ifndef __APPLE__
331
332 // Buffer that fits several sprintfs.
333 // Note that the space for the colon and the trailing null are provided
334 // by the nulls included by the sizeof operator.
335 const size_t bufsize =
336 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
337 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
338 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
339
340 // sysclasspath, java_home, dll_dir
341 {
342 char *pslash;
343 os::jvm_path(buf, bufsize);
344
345 // Found the full path to libjvm.so.
346 // Now cut the path to <java_home>/jre if we can.
347 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
348 pslash = strrchr(buf, '/');
349 if (pslash != NULL) {
350 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
351 }
352 Arguments::set_dll_dir(buf);
353
354 if (pslash != NULL) {
355 pslash = strrchr(buf, '/');
356 if (pslash != NULL) {
357 *pslash = '\0'; // Get rid of /<arch>.
358 pslash = strrchr(buf, '/');
359 if (pslash != NULL) {
360 *pslash = '\0'; // Get rid of /lib.
361 }
362 }
363 }
364 Arguments::set_java_home(buf);
365 if (!set_boot_path('/', ':')) {
366 vm_exit_during_initialization("Failed setting boot class path.", NULL);
367 }
368 }
369
370 // Where to look for native libraries.
371 //
372 // Note: Due to a legacy implementation, most of the library path
373 // is set in the launcher. This was to accomodate linking restrictions
374 // on legacy Bsd implementations (which are no longer supported).
375 // Eventually, all the library path setting will be done here.
376 //
377 // However, to prevent the proliferation of improperly built native
378 // libraries, the new path component /usr/java/packages is added here.
379 // Eventually, all the library path setting will be done here.
380 {
381 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
382 // should always exist (until the legacy problem cited above is
383 // addressed).
384 const char *v = ::getenv("LD_LIBRARY_PATH");
385 const char *v_colon = ":";
386 if (v == NULL) { v = ""; v_colon = ""; }
387 // That's +1 for the colon and +1 for the trailing '\0'.
388 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
389 strlen(v) + 1 +
390 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
391 mtInternal);
392 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
393 Arguments::set_library_path(ld_library_path);
394 FREE_C_HEAP_ARRAY(char, ld_library_path);
395 }
396
397 // Extensions directories.
398 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
399 Arguments::set_ext_dirs(buf);
400
401 FREE_C_HEAP_ARRAY(char, buf);
402
403 #else // __APPLE__
404
405 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
406 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
407
408 const char *user_home_dir = get_home();
409 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
410 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
411 sizeof(SYS_EXTENSIONS_DIRS);
412
413 // Buffer that fits several sprintfs.
414 // Note that the space for the colon and the trailing null are provided
415 // by the nulls included by the sizeof operator.
416 const size_t bufsize =
417 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
418 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
419 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
420
421 // sysclasspath, java_home, dll_dir
422 {
423 char *pslash;
424 os::jvm_path(buf, bufsize);
425
426 // Found the full path to libjvm.so.
427 // Now cut the path to <java_home>/jre if we can.
428 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
429 pslash = strrchr(buf, '/');
430 if (pslash != NULL) {
431 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
432 }
433 #ifdef STATIC_BUILD
434 strcat(buf, "/lib");
435 #endif
436
437 Arguments::set_dll_dir(buf);
438
439 if (pslash != NULL) {
440 pslash = strrchr(buf, '/');
441 if (pslash != NULL) {
442 *pslash = '\0'; // Get rid of /lib.
443 }
444 }
445 Arguments::set_java_home(buf);
446 set_boot_path('/', ':');
447 }
448
449 // Where to look for native libraries.
450 //
451 // Note: Due to a legacy implementation, most of the library path
452 // is set in the launcher. This was to accomodate linking restrictions
453 // on legacy Bsd implementations (which are no longer supported).
454 // Eventually, all the library path setting will be done here.
455 //
456 // However, to prevent the proliferation of improperly built native
457 // libraries, the new path component /usr/java/packages is added here.
458 // Eventually, all the library path setting will be done here.
459 {
460 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
461 // should always exist (until the legacy problem cited above is
462 // addressed).
463 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
464 // can specify a directory inside an app wrapper
465 const char *l = ::getenv("JAVA_LIBRARY_PATH");
466 const char *l_colon = ":";
467 if (l == NULL) { l = ""; l_colon = ""; }
468
469 const char *v = ::getenv("DYLD_LIBRARY_PATH");
470 const char *v_colon = ":";
471 if (v == NULL) { v = ""; v_colon = ""; }
472
473 // Apple's Java6 has "." at the beginning of java.library.path.
474 // OpenJDK on Windows has "." at the end of java.library.path.
475 // OpenJDK on Linux and Solaris don't have "." in java.library.path
476 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
477 // "." is appended to the end of java.library.path. Yes, this
478 // could cause a change in behavior, but Apple's Java6 behavior
479 // can be achieved by putting "." at the beginning of the
480 // JAVA_LIBRARY_PATH environment variable.
481 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
482 strlen(v) + 1 + strlen(l) + 1 +
483 system_ext_size + 3,
484 mtInternal);
485 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
486 v, v_colon, l, l_colon, user_home_dir);
487 Arguments::set_library_path(ld_library_path);
488 FREE_C_HEAP_ARRAY(char, ld_library_path);
489 }
490
491 // Extensions directories.
492 //
493 // Note that the space for the colon and the trailing null are provided
494 // by the nulls included by the sizeof operator (so actually one byte more
495 // than necessary is allocated).
496 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
497 user_home_dir, Arguments::get_java_home());
498 Arguments::set_ext_dirs(buf);
499
500 FREE_C_HEAP_ARRAY(char, buf);
501
502 #undef SYS_EXTENSIONS_DIR
503 #undef SYS_EXTENSIONS_DIRS
504
505 #endif // __APPLE__
506
507 #undef SYS_EXT_DIR
508 #undef EXTENSIONS_DIR
509 }
510
511 ////////////////////////////////////////////////////////////////////////////////
512 // breakpoint support
513
514 void os::breakpoint() {
515 BREAKPOINT;
516 }
517
518 extern "C" void breakpoint() {
519 // use debugger to set breakpoint here
520 }
521
522 ////////////////////////////////////////////////////////////////////////////////
523 // signal support
524
525 debug_only(static bool signal_sets_initialized = false);
526 static sigset_t unblocked_sigs, vm_sigs;
527
528 void os::Bsd::signal_sets_init() {
529 // Should also have an assertion stating we are still single-threaded.
530 assert(!signal_sets_initialized, "Already initialized");
531 // Fill in signals that are necessarily unblocked for all threads in
532 // the VM. Currently, we unblock the following signals:
533 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
534 // by -Xrs (=ReduceSignalUsage));
535 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
536 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
537 // the dispositions or masks wrt these signals.
538 // Programs embedding the VM that want to use the above signals for their
539 // own purposes must, at this time, use the "-Xrs" option to prevent
540 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
541 // (See bug 4345157, and other related bugs).
542 // In reality, though, unblocking these signals is really a nop, since
543 // these signals are not blocked by default.
544 sigemptyset(&unblocked_sigs);
545 sigaddset(&unblocked_sigs, SIGILL);
546 sigaddset(&unblocked_sigs, SIGSEGV);
547 sigaddset(&unblocked_sigs, SIGBUS);
548 sigaddset(&unblocked_sigs, SIGFPE);
549 sigaddset(&unblocked_sigs, SR_signum);
550
551 if (!ReduceSignalUsage) {
552 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
553 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
554
555 }
556 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
557 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
558 }
559 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
560 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
561 }
562 }
563 // Fill in signals that are blocked by all but the VM thread.
564 sigemptyset(&vm_sigs);
565 if (!ReduceSignalUsage) {
566 sigaddset(&vm_sigs, BREAK_SIGNAL);
567 }
568 debug_only(signal_sets_initialized = true);
569
570 }
571
572 // These are signals that are unblocked while a thread is running Java.
573 // (For some reason, they get blocked by default.)
574 sigset_t* os::Bsd::unblocked_signals() {
575 assert(signal_sets_initialized, "Not initialized");
576 return &unblocked_sigs;
577 }
578
579 // These are the signals that are blocked while a (non-VM) thread is
580 // running Java. Only the VM thread handles these signals.
581 sigset_t* os::Bsd::vm_signals() {
582 assert(signal_sets_initialized, "Not initialized");
583 return &vm_sigs;
584 }
585
586 void os::Bsd::hotspot_sigmask(Thread* thread) {
587
588 //Save caller's signal mask before setting VM signal mask
589 sigset_t caller_sigmask;
590 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
591
592 OSThread* osthread = thread->osthread();
593 osthread->set_caller_sigmask(caller_sigmask);
594
595 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
596
597 if (!ReduceSignalUsage) {
598 if (thread->is_VM_thread()) {
599 // Only the VM thread handles BREAK_SIGNAL ...
600 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
601 } else {
602 // ... all other threads block BREAK_SIGNAL
603 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
604 }
605 }
606 }
607
608
609 //////////////////////////////////////////////////////////////////////////////
610 // create new thread
611
612 #ifdef __APPLE__
613 // library handle for calling objc_registerThreadWithCollector()
614 // without static linking to the libobjc library
615 #define OBJC_LIB "/usr/lib/libobjc.dylib"
616 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
617 typedef void (*objc_registerThreadWithCollector_t)();
618 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
619 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
620 #endif
621
622 #ifdef __APPLE__
623 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
624 // Additional thread_id used to correlate threads in SA
625 thread_identifier_info_data_t m_ident_info;
626 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
627
628 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
629 (thread_info_t) &m_ident_info, &count);
630
631 return m_ident_info.thread_id;
632 }
633 #endif
634
635 // Thread start routine for all newly created threads
636 static void *thread_native_entry(Thread *thread) {
637
638 thread->record_stack_base_and_size();
639
640 // Try to randomize the cache line index of hot stack frames.
641 // This helps when threads of the same stack traces evict each other's
642 // cache lines. The threads can be either from the same JVM instance, or
643 // from different JVM instances. The benefit is especially true for
644 // processors with hyperthreading technology.
645 static int counter = 0;
646 int pid = os::current_process_id();
647 alloca(((pid ^ counter++) & 7) * 128);
648
649 thread->initialize_thread_current();
650
651 OSThread* osthread = thread->osthread();
652 Monitor* sync = osthread->startThread_lock();
653
654 osthread->set_thread_id(os::Bsd::gettid());
655
656 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
657 os::current_thread_id(), (uintx) pthread_self());
658
659 #ifdef __APPLE__
660 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
661 guarantee(unique_thread_id != 0, "unique thread id was not found");
662 osthread->set_unique_thread_id(unique_thread_id);
663 #endif
664 // initialize signal mask for this thread
665 os::Bsd::hotspot_sigmask(thread);
666
667 // initialize floating point control register
668 os::Bsd::init_thread_fpu_state();
669
670 #ifdef __APPLE__
671 // register thread with objc gc
672 if (objc_registerThreadWithCollectorFunction != NULL) {
673 objc_registerThreadWithCollectorFunction();
674 }
675 #endif
676
677 // handshaking with parent thread
678 {
679 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
680
681 // notify parent thread
682 osthread->set_state(INITIALIZED);
683 sync->notify_all();
684
685 // wait until os::start_thread()
686 while (osthread->get_state() == INITIALIZED) {
687 sync->wait_without_safepoint_check();
688 }
689 }
690
691 // call one more level start routine
692 thread->call_run();
693
694 // Note: at this point the thread object may already have deleted itself.
695 // Prevent dereferencing it from here on out.
696 thread = NULL;
697
698 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
699 os::current_thread_id(), (uintx) pthread_self());
700
701 return 0;
702 }
703
704 bool os::create_thread(Thread* thread, ThreadType thr_type,
705 size_t req_stack_size) {
706 assert(thread->osthread() == NULL, "caller responsible");
707
708 // Allocate the OSThread object
709 OSThread* osthread = new OSThread(NULL, NULL);
710 if (osthread == NULL) {
711 return false;
712 }
713
714 // set the correct thread state
715 osthread->set_thread_type(thr_type);
716
717 // Initial state is ALLOCATED but not INITIALIZED
718 osthread->set_state(ALLOCATED);
719
720 thread->set_osthread(osthread);
721
722 // init thread attributes
723 pthread_attr_t attr;
724 pthread_attr_init(&attr);
725 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
726
727 // calculate stack size if it's not specified by caller
728 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
729 int status = pthread_attr_setstacksize(&attr, stack_size);
730 assert_status(status == 0, status, "pthread_attr_setstacksize");
731
732 ThreadState state;
733
734 {
735 pthread_t tid;
736 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
737
738 char buf[64];
739 if (ret == 0) {
740 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
741 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
742 } else {
743 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
744 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
745 // Log some OS information which might explain why creating the thread failed.
746 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
747 LogStream st(Log(os, thread)::info());
748 os::Posix::print_rlimit_info(&st);
749 os::print_memory_info(&st);
750 }
751
752 pthread_attr_destroy(&attr);
753
754 if (ret != 0) {
755 // Need to clean up stuff we've allocated so far
756 thread->set_osthread(NULL);
757 delete osthread;
758 return false;
759 }
760
761 // Store pthread info into the OSThread
762 osthread->set_pthread_id(tid);
763
764 // Wait until child thread is either initialized or aborted
765 {
766 Monitor* sync_with_child = osthread->startThread_lock();
767 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
768 while ((state = osthread->get_state()) == ALLOCATED) {
769 sync_with_child->wait_without_safepoint_check();
770 }
771 }
772
773 }
774
775 // Aborted due to thread limit being reached
776 if (state == ZOMBIE) {
777 thread->set_osthread(NULL);
778 delete osthread;
779 return false;
780 }
781
782 // The thread is returned suspended (in state INITIALIZED),
783 // and is started higher up in the call chain
784 assert(state == INITIALIZED, "race condition");
785 return true;
786 }
787
788 /////////////////////////////////////////////////////////////////////////////
789 // attach existing thread
790
791 // bootstrap the main thread
792 bool os::create_main_thread(JavaThread* thread) {
793 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
794 return create_attached_thread(thread);
795 }
796
797 bool os::create_attached_thread(JavaThread* thread) {
798 #ifdef ASSERT
799 thread->verify_not_published();
800 #endif
801
802 // Allocate the OSThread object
803 OSThread* osthread = new OSThread(NULL, NULL);
804
805 if (osthread == NULL) {
806 return false;
807 }
808
809 osthread->set_thread_id(os::Bsd::gettid());
810
811 // Store pthread info into the OSThread
812 #ifdef __APPLE__
813 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
814 guarantee(unique_thread_id != 0, "just checking");
815 osthread->set_unique_thread_id(unique_thread_id);
816 #endif
817 osthread->set_pthread_id(::pthread_self());
818
819 // initialize floating point control register
820 os::Bsd::init_thread_fpu_state();
821
822 // Initial thread state is RUNNABLE
823 osthread->set_state(RUNNABLE);
824
825 thread->set_osthread(osthread);
826
827 // initialize signal mask for this thread
828 // and save the caller's signal mask
829 os::Bsd::hotspot_sigmask(thread);
830
831 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
832 os::current_thread_id(), (uintx) pthread_self());
833
834 return true;
835 }
836
837 void os::pd_start_thread(Thread* thread) {
838 OSThread * osthread = thread->osthread();
839 assert(osthread->get_state() != INITIALIZED, "just checking");
840 Monitor* sync_with_child = osthread->startThread_lock();
841 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
842 sync_with_child->notify();
843 }
844
845 // Free Bsd resources related to the OSThread
846 void os::free_thread(OSThread* osthread) {
847 assert(osthread != NULL, "osthread not set");
848
849 // We are told to free resources of the argument thread,
850 // but we can only really operate on the current thread.
851 assert(Thread::current()->osthread() == osthread,
852 "os::free_thread but not current thread");
853
854 // Restore caller's signal mask
855 sigset_t sigmask = osthread->caller_sigmask();
856 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
857
858 delete osthread;
859 }
860
861 ////////////////////////////////////////////////////////////////////////////////
862 // time support
863
864 // Time since start-up in seconds to a fine granularity.
865 // Used by VMSelfDestructTimer and the MemProfiler.
866 double os::elapsedTime() {
867
868 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
869 }
870
871 jlong os::elapsed_counter() {
872 return javaTimeNanos() - initial_time_count;
873 }
874
875 jlong os::elapsed_frequency() {
876 return NANOSECS_PER_SEC; // nanosecond resolution
877 }
878
879 bool os::supports_vtime() { return true; }
880
881 double os::elapsedVTime() {
882 // better than nothing, but not much
883 return elapsedTime();
884 }
885
886 jlong os::javaTimeMillis() {
887 timeval time;
888 int status = gettimeofday(&time, NULL);
889 assert(status != -1, "bsd error");
890 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
891 }
892
893 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
894 timeval time;
895 int status = gettimeofday(&time, NULL);
896 assert(status != -1, "bsd error");
897 seconds = jlong(time.tv_sec);
898 nanos = jlong(time.tv_usec) * 1000;
899 }
900
901 #ifndef __APPLE__
902 #ifndef CLOCK_MONOTONIC
903 #define CLOCK_MONOTONIC (1)
904 #endif
905 #endif
906
907 #ifdef __APPLE__
908 void os::Bsd::clock_init() {
909 mach_timebase_info(&_timebase_info);
910 }
911 #else
912 void os::Bsd::clock_init() {
913 struct timespec res;
914 struct timespec tp;
915 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
916 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
917 // yes, monotonic clock is supported
918 _clock_gettime = ::clock_gettime;
919 }
920 }
921 #endif
922
923
924
925 #ifdef __APPLE__
926
927 jlong os::javaTimeNanos() {
928 const uint64_t tm = mach_absolute_time();
929 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
930 const uint64_t prev = Bsd::_max_abstime;
931 if (now <= prev) {
932 return prev; // same or retrograde time;
933 }
934 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
935 assert(obsv >= prev, "invariant"); // Monotonicity
936 // If the CAS succeeded then we're done and return "now".
937 // If the CAS failed and the observed value "obsv" is >= now then
938 // we should return "obsv". If the CAS failed and now > obsv > prv then
939 // some other thread raced this thread and installed a new value, in which case
940 // we could either (a) retry the entire operation, (b) retry trying to install now
941 // or (c) just return obsv. We use (c). No loop is required although in some cases
942 // we might discard a higher "now" value in deference to a slightly lower but freshly
943 // installed obsv value. That's entirely benign -- it admits no new orderings compared
944 // to (a) or (b) -- and greatly reduces coherence traffic.
945 // We might also condition (c) on the magnitude of the delta between obsv and now.
946 // Avoiding excessive CAS operations to hot RW locations is critical.
947 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
948 return (prev == obsv) ? now : obsv;
949 }
950
951 #else // __APPLE__
952
953 jlong os::javaTimeNanos() {
954 if (os::supports_monotonic_clock()) {
955 struct timespec tp;
956 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
957 assert(status == 0, "gettime error");
958 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
959 return result;
960 } else {
961 timeval time;
962 int status = gettimeofday(&time, NULL);
963 assert(status != -1, "bsd error");
964 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
965 return 1000 * usecs;
966 }
967 }
968
969 #endif // __APPLE__
970
971 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
972 if (os::supports_monotonic_clock()) {
973 info_ptr->max_value = ALL_64_BITS;
974
975 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
976 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
977 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
978 } else {
979 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
980 info_ptr->max_value = ALL_64_BITS;
981
982 // gettimeofday is a real time clock so it skips
983 info_ptr->may_skip_backward = true;
984 info_ptr->may_skip_forward = true;
985 }
986
987 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
988 }
989
990 // Return the real, user, and system times in seconds from an
991 // arbitrary fixed point in the past.
992 bool os::getTimesSecs(double* process_real_time,
993 double* process_user_time,
994 double* process_system_time) {
995 struct tms ticks;
996 clock_t real_ticks = times(&ticks);
997
998 if (real_ticks == (clock_t) (-1)) {
999 return false;
1000 } else {
1001 double ticks_per_second = (double) clock_tics_per_sec;
1002 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1003 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1004 *process_real_time = ((double) real_ticks) / ticks_per_second;
1005
1006 return true;
1007 }
1008 }
1009
1010
1011 char * os::local_time_string(char *buf, size_t buflen) {
1012 struct tm t;
1013 time_t long_time;
1014 time(&long_time);
1015 localtime_r(&long_time, &t);
1016 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1017 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1018 t.tm_hour, t.tm_min, t.tm_sec);
1019 return buf;
1020 }
1021
1022 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1023 return localtime_r(clock, res);
1024 }
1025
1026 ////////////////////////////////////////////////////////////////////////////////
1027 // runtime exit support
1028
1029 // Note: os::shutdown() might be called very early during initialization, or
1030 // called from signal handler. Before adding something to os::shutdown(), make
1031 // sure it is async-safe and can handle partially initialized VM.
1032 void os::shutdown() {
1033
1034 // allow PerfMemory to attempt cleanup of any persistent resources
1035 perfMemory_exit();
1036
1037 // needs to remove object in file system
1038 AttachListener::abort();
1039
1040 // flush buffered output, finish log files
1041 ostream_abort();
1042
1043 // Check for abort hook
1044 abort_hook_t abort_hook = Arguments::abort_hook();
1045 if (abort_hook != NULL) {
1046 abort_hook();
1047 }
1048
1049 }
1050
1051 // Note: os::abort() might be called very early during initialization, or
1052 // called from signal handler. Before adding something to os::abort(), make
1053 // sure it is async-safe and can handle partially initialized VM.
1054 void os::abort(bool dump_core, void* siginfo, const void* context) {
1055 os::shutdown();
1056 if (dump_core) {
1057 #ifndef PRODUCT
1058 fdStream out(defaultStream::output_fd());
1059 out.print_raw("Current thread is ");
1060 char buf[16];
1061 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1062 out.print_raw_cr(buf);
1063 out.print_raw_cr("Dumping core ...");
1064 #endif
1065 ::abort(); // dump core
1066 }
1067
1068 ::exit(1);
1069 }
1070
1071 // Die immediately, no exit hook, no abort hook, no cleanup.
1072 // Dump a core file, if possible, for debugging.
1073 void os::die() {
1074 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1075 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1076 // and don't take the time to generate a core file.
1077 os::signal_raise(SIGKILL);
1078 } else {
1079 // _exit() on BsdThreads only kills current thread
1080 ::abort();
1081 }
1082 }
1083
1084 // Information of current thread in variety of formats
1085 pid_t os::Bsd::gettid() {
1086 int retval = -1;
1087
1088 #ifdef __APPLE__ //XNU kernel
1089 // despite the fact mach port is actually not a thread id use it
1090 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1091 retval = ::pthread_mach_thread_np(::pthread_self());
1092 guarantee(retval != 0, "just checking");
1093 return retval;
1094
1095 #else
1096 #ifdef __FreeBSD__
1097 retval = syscall(SYS_thr_self);
1098 #else
1099 #ifdef __OpenBSD__
1100 retval = syscall(SYS_getthrid);
1101 #else
1102 #ifdef __NetBSD__
1103 retval = (pid_t) syscall(SYS__lwp_self);
1104 #endif
1105 #endif
1106 #endif
1107 #endif
1108
1109 if (retval == -1) {
1110 return getpid();
1111 }
1112 }
1113
1114 intx os::current_thread_id() {
1115 #ifdef __APPLE__
1116 return (intx)::pthread_mach_thread_np(::pthread_self());
1117 #else
1118 return (intx)::pthread_self();
1119 #endif
1120 }
1121
1122 int os::current_process_id() {
1123 return (int)(getpid());
1124 }
1125
1126 // DLL functions
1127
1128 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1129
1130 // This must be hard coded because it's the system's temporary
1131 // directory not the java application's temp directory, ala java.io.tmpdir.
1132 #ifdef __APPLE__
1133 // macosx has a secure per-user temporary directory
1134 char temp_path_storage[PATH_MAX];
1135 const char* os::get_temp_directory() {
1136 static char *temp_path = NULL;
1137 if (temp_path == NULL) {
1138 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1139 if (pathSize == 0 || pathSize > PATH_MAX) {
1140 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1141 }
1142 temp_path = temp_path_storage;
1143 }
1144 return temp_path;
1145 }
1146 #else // __APPLE__
1147 const char* os::get_temp_directory() { return "/tmp"; }
1148 #endif // __APPLE__
1149
1150 // check if addr is inside libjvm.so
1151 bool os::address_is_in_vm(address addr) {
1152 static address libjvm_base_addr;
1153 Dl_info dlinfo;
1154
1155 if (libjvm_base_addr == NULL) {
1156 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1157 libjvm_base_addr = (address)dlinfo.dli_fbase;
1158 }
1159 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1160 }
1161
1162 if (dladdr((void *)addr, &dlinfo) != 0) {
1163 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1164 }
1165
1166 return false;
1167 }
1168
1169
1170 #define MACH_MAXSYMLEN 256
1171
1172 bool os::dll_address_to_function_name(address addr, char *buf,
1173 int buflen, int *offset,
1174 bool demangle) {
1175 // buf is not optional, but offset is optional
1176 assert(buf != NULL, "sanity check");
1177
1178 Dl_info dlinfo;
1179 char localbuf[MACH_MAXSYMLEN];
1180
1181 if (dladdr((void*)addr, &dlinfo) != 0) {
1182 // see if we have a matching symbol
1183 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1184 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1185 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1186 }
1187 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1188 return true;
1189 }
1190 // no matching symbol so try for just file info
1191 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1192 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1193 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1194 return true;
1195 }
1196 }
1197
1198 // Handle non-dynamic manually:
1199 if (dlinfo.dli_fbase != NULL &&
1200 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1201 dlinfo.dli_fbase)) {
1202 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1203 jio_snprintf(buf, buflen, "%s", localbuf);
1204 }
1205 return true;
1206 }
1207 }
1208 buf[0] = '\0';
1209 if (offset != NULL) *offset = -1;
1210 return false;
1211 }
1212
1213 // ported from solaris version
1214 bool os::dll_address_to_library_name(address addr, char* buf,
1215 int buflen, int* offset) {
1216 // buf is not optional, but offset is optional
1217 assert(buf != NULL, "sanity check");
1218
1219 Dl_info dlinfo;
1220
1221 if (dladdr((void*)addr, &dlinfo) != 0) {
1222 if (dlinfo.dli_fname != NULL) {
1223 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1224 }
1225 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1226 *offset = addr - (address)dlinfo.dli_fbase;
1227 }
1228 return true;
1229 }
1230
1231 buf[0] = '\0';
1232 if (offset) *offset = -1;
1233 return false;
1234 }
1235
1236 // Loads .dll/.so and
1237 // in case of error it checks if .dll/.so was built for the
1238 // same architecture as Hotspot is running on
1239
1240 #ifdef __APPLE__
1241 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1242 #ifdef STATIC_BUILD
1243 return os::get_default_process_handle();
1244 #else
1245 log_info(os)("attempting shared library load of %s", filename);
1246
1247 void * result= ::dlopen(filename, RTLD_LAZY);
1248 if (result != NULL) {
1249 Events::log(NULL, "Loaded shared library %s", filename);
1250 // Successful loading
1251 log_info(os)("shared library load of %s was successful", filename);
1252 return result;
1253 }
1254
1255 const char* error_report = ::dlerror();
1256 if (error_report == NULL) {
1257 error_report = "dlerror returned no error description";
1258 }
1259 if (ebuf != NULL && ebuflen > 0) {
1260 // Read system error message into ebuf
1261 ::strncpy(ebuf, error_report, ebuflen-1);
1262 ebuf[ebuflen-1]='\0';
1263 }
1264 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1265 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1266
1267 return NULL;
1268 #endif // STATIC_BUILD
1269 }
1270 #else
1271 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1272 #ifdef STATIC_BUILD
1273 return os::get_default_process_handle();
1274 #else
1275 log_info(os)("attempting shared library load of %s", filename);
1276 void * result= ::dlopen(filename, RTLD_LAZY);
1277 if (result != NULL) {
1278 Events::log(NULL, "Loaded shared library %s", filename);
1279 // Successful loading
1280 log_info(os)("shared library load of %s was successful", filename);
1281 return result;
1282 }
1283
1284 Elf32_Ehdr elf_head;
1285
1286 const char* const error_report = ::dlerror();
1287 if (error_report == NULL) {
1288 error_report = "dlerror returned no error description";
1289 }
1290 if (ebuf != NULL && ebuflen > 0) {
1291 // Read system error message into ebuf
1292 ::strncpy(ebuf, error_report, ebuflen-1);
1293 ebuf[ebuflen-1]='\0';
1294 }
1295 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1296 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1297
1298 int diag_msg_max_length=ebuflen-strlen(ebuf);
1299 char* diag_msg_buf=ebuf+strlen(ebuf);
1300
1301 if (diag_msg_max_length==0) {
1302 // No more space in ebuf for additional diagnostics message
1303 return NULL;
1304 }
1305
1306
1307 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1308
1309 if (file_descriptor < 0) {
1310 // Can't open library, report dlerror() message
1311 return NULL;
1312 }
1313
1314 bool failed_to_read_elf_head=
1315 (sizeof(elf_head)!=
1316 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1317
1318 ::close(file_descriptor);
1319 if (failed_to_read_elf_head) {
1320 // file i/o error - report dlerror() msg
1321 return NULL;
1322 }
1323
1324 typedef struct {
1325 Elf32_Half code; // Actual value as defined in elf.h
1326 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1327 char elf_class; // 32 or 64 bit
1328 char endianess; // MSB or LSB
1329 char* name; // String representation
1330 } arch_t;
1331
1332 #ifndef EM_486
1333 #define EM_486 6 /* Intel 80486 */
1334 #endif
1335
1336 #ifndef EM_MIPS_RS3_LE
1337 #define EM_MIPS_RS3_LE 10 /* MIPS */
1338 #endif
1339
1340 #ifndef EM_PPC64
1341 #define EM_PPC64 21 /* PowerPC64 */
1342 #endif
1343
1344 #ifndef EM_S390
1345 #define EM_S390 22 /* IBM System/390 */
1346 #endif
1347
1348 #ifndef EM_IA_64
1349 #define EM_IA_64 50 /* HP/Intel IA-64 */
1350 #endif
1351
1352 #ifndef EM_X86_64
1353 #define EM_X86_64 62 /* AMD x86-64 */
1354 #endif
1355
1356 static const arch_t arch_array[]={
1357 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1358 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1359 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1360 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1361 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1362 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1363 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1364 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1365 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1366 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1367 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1368 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1369 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1370 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1371 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1372 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1373 };
1374
1375 #if (defined IA32)
1376 static Elf32_Half running_arch_code=EM_386;
1377 #elif (defined AMD64)
1378 static Elf32_Half running_arch_code=EM_X86_64;
1379 #elif (defined IA64)
1380 static Elf32_Half running_arch_code=EM_IA_64;
1381 #elif (defined __sparc) && (defined _LP64)
1382 static Elf32_Half running_arch_code=EM_SPARCV9;
1383 #elif (defined __sparc) && (!defined _LP64)
1384 static Elf32_Half running_arch_code=EM_SPARC;
1385 #elif (defined __powerpc64__)
1386 static Elf32_Half running_arch_code=EM_PPC64;
1387 #elif (defined __powerpc__)
1388 static Elf32_Half running_arch_code=EM_PPC;
1389 #elif (defined ARM)
1390 static Elf32_Half running_arch_code=EM_ARM;
1391 #elif (defined S390)
1392 static Elf32_Half running_arch_code=EM_S390;
1393 #elif (defined ALPHA)
1394 static Elf32_Half running_arch_code=EM_ALPHA;
1395 #elif (defined MIPSEL)
1396 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1397 #elif (defined PARISC)
1398 static Elf32_Half running_arch_code=EM_PARISC;
1399 #elif (defined MIPS)
1400 static Elf32_Half running_arch_code=EM_MIPS;
1401 #elif (defined M68K)
1402 static Elf32_Half running_arch_code=EM_68K;
1403 #else
1404 #error Method os::dll_load requires that one of following is defined:\
1405 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1406 #endif
1407
1408 // Identify compatability class for VM's architecture and library's architecture
1409 // Obtain string descriptions for architectures
1410
1411 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1412 int running_arch_index=-1;
1413
1414 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1415 if (running_arch_code == arch_array[i].code) {
1416 running_arch_index = i;
1417 }
1418 if (lib_arch.code == arch_array[i].code) {
1419 lib_arch.compat_class = arch_array[i].compat_class;
1420 lib_arch.name = arch_array[i].name;
1421 }
1422 }
1423
1424 assert(running_arch_index != -1,
1425 "Didn't find running architecture code (running_arch_code) in arch_array");
1426 if (running_arch_index == -1) {
1427 // Even though running architecture detection failed
1428 // we may still continue with reporting dlerror() message
1429 return NULL;
1430 }
1431
1432 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1433 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1434 return NULL;
1435 }
1436
1437 #ifndef S390
1438 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1439 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1440 return NULL;
1441 }
1442 #endif // !S390
1443
1444 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1445 if (lib_arch.name!=NULL) {
1446 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1447 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1448 lib_arch.name, arch_array[running_arch_index].name);
1449 } else {
1450 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1451 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1452 lib_arch.code,
1453 arch_array[running_arch_index].name);
1454 }
1455 }
1456
1457 return NULL;
1458 #endif // STATIC_BUILD
1459 }
1460 #endif // !__APPLE__
1461
1462 void* os::get_default_process_handle() {
1463 #ifdef __APPLE__
1464 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1465 // to avoid finding unexpected symbols on second (or later)
1466 // loads of a library.
1467 return (void*)::dlopen(NULL, RTLD_FIRST);
1468 #else
1469 return (void*)::dlopen(NULL, RTLD_LAZY);
1470 #endif
1471 }
1472
1473 // XXX: Do we need a lock around this as per Linux?
1474 void* os::dll_lookup(void* handle, const char* name) {
1475 return dlsym(handle, name);
1476 }
1477
1478 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1479 outputStream * out = (outputStream *) param;
1480 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1481 return 0;
1482 }
1483
1484 void os::print_dll_info(outputStream *st) {
1485 st->print_cr("Dynamic libraries:");
1486 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1487 st->print_cr("Error: Cannot print dynamic libraries.");
1488 }
1489 }
1490
1491 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1492 #ifdef RTLD_DI_LINKMAP
1493 Dl_info dli;
1494 void *handle;
1495 Link_map *map;
1496 Link_map *p;
1497
1498 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1499 dli.dli_fname == NULL) {
1500 return 1;
1501 }
1502 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1503 if (handle == NULL) {
1504 return 1;
1505 }
1506 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1507 if (map == NULL) {
1508 dlclose(handle);
1509 return 1;
1510 }
1511
1512 while (map->l_prev != NULL)
1513 map = map->l_prev;
1514
1515 while (map != NULL) {
1516 // Value for top_address is returned as 0 since we don't have any information about module size
1517 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1518 dlclose(handle);
1519 return 1;
1520 }
1521 map = map->l_next;
1522 }
1523
1524 dlclose(handle);
1525 #elif defined(__APPLE__)
1526 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1527 // Value for top_address is returned as 0 since we don't have any information about module size
1528 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1529 return 1;
1530 }
1531 }
1532 return 0;
1533 #else
1534 return 1;
1535 #endif
1536 }
1537
1538 void os::get_summary_os_info(char* buf, size_t buflen) {
1539 // These buffers are small because we want this to be brief
1540 // and not use a lot of stack while generating the hs_err file.
1541 char os[100];
1542 size_t size = sizeof(os);
1543 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1544 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1545 #ifdef __APPLE__
1546 strncpy(os, "Darwin", sizeof(os));
1547 #elif __OpenBSD__
1548 strncpy(os, "OpenBSD", sizeof(os));
1549 #else
1550 strncpy(os, "BSD", sizeof(os));
1551 #endif
1552 }
1553
1554 char release[100];
1555 size = sizeof(release);
1556 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1557 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1558 // if error, leave blank
1559 strncpy(release, "", sizeof(release));
1560 }
1561 snprintf(buf, buflen, "%s %s", os, release);
1562 }
1563
1564 void os::print_os_info_brief(outputStream* st) {
1565 os::Posix::print_uname_info(st);
1566 }
1567
1568 void os::print_os_info(outputStream* st) {
1569 st->print("OS:");
1570
1571 os::Posix::print_uname_info(st);
1572
1573 os::Posix::print_rlimit_info(st);
1574
1575 os::Posix::print_load_average(st);
1576 }
1577
1578 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1579 // Nothing to do for now.
1580 }
1581
1582 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1583 unsigned int mhz;
1584 size_t size = sizeof(mhz);
1585 int mib[] = { CTL_HW, HW_CPU_FREQ };
1586 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1587 mhz = 1; // looks like an error but can be divided by
1588 } else {
1589 mhz /= 1000000; // reported in millions
1590 }
1591
1592 char model[100];
1593 size = sizeof(model);
1594 int mib_model[] = { CTL_HW, HW_MODEL };
1595 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1596 strncpy(model, cpu_arch, sizeof(model));
1597 }
1598
1599 char machine[100];
1600 size = sizeof(machine);
1601 int mib_machine[] = { CTL_HW, HW_MACHINE };
1602 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1603 strncpy(machine, "", sizeof(machine));
1604 }
1605
1606 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1607 }
1608
1609 void os::print_memory_info(outputStream* st) {
1610 xsw_usage swap_usage;
1611 size_t size = sizeof(swap_usage);
1612
1613 st->print("Memory:");
1614 st->print(" %dk page", os::vm_page_size()>>10);
1615
1616 st->print(", physical " UINT64_FORMAT "k",
1617 os::physical_memory() >> 10);
1618 st->print("(" UINT64_FORMAT "k free)",
1619 os::available_memory() >> 10);
1620
1621 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1622 if (size >= offset_of(xsw_usage, xsu_used)) {
1623 st->print(", swap " UINT64_FORMAT "k",
1624 ((julong) swap_usage.xsu_total) >> 10);
1625 st->print("(" UINT64_FORMAT "k free)",
1626 ((julong) swap_usage.xsu_avail) >> 10);
1627 }
1628 }
1629
1630 st->cr();
1631 }
1632
1633 static void print_signal_handler(outputStream* st, int sig,
1634 char* buf, size_t buflen);
1635
1636 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1637 st->print_cr("Signal Handlers:");
1638 print_signal_handler(st, SIGSEGV, buf, buflen);
1639 print_signal_handler(st, SIGBUS , buf, buflen);
1640 print_signal_handler(st, SIGFPE , buf, buflen);
1641 print_signal_handler(st, SIGPIPE, buf, buflen);
1642 print_signal_handler(st, SIGXFSZ, buf, buflen);
1643 print_signal_handler(st, SIGILL , buf, buflen);
1644 print_signal_handler(st, SR_signum, buf, buflen);
1645 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1646 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1647 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1648 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1649 }
1650
1651 static char saved_jvm_path[MAXPATHLEN] = {0};
1652
1653 // Find the full path to the current module, libjvm
1654 void os::jvm_path(char *buf, jint buflen) {
1655 // Error checking.
1656 if (buflen < MAXPATHLEN) {
1657 assert(false, "must use a large-enough buffer");
1658 buf[0] = '\0';
1659 return;
1660 }
1661 // Lazy resolve the path to current module.
1662 if (saved_jvm_path[0] != 0) {
1663 strcpy(buf, saved_jvm_path);
1664 return;
1665 }
1666
1667 char dli_fname[MAXPATHLEN];
1668 bool ret = dll_address_to_library_name(
1669 CAST_FROM_FN_PTR(address, os::jvm_path),
1670 dli_fname, sizeof(dli_fname), NULL);
1671 assert(ret, "cannot locate libjvm");
1672 char *rp = NULL;
1673 if (ret && dli_fname[0] != '\0') {
1674 rp = os::Posix::realpath(dli_fname, buf, buflen);
1675 }
1676 if (rp == NULL) {
1677 return;
1678 }
1679
1680 if (Arguments::sun_java_launcher_is_altjvm()) {
1681 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1682 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1683 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1684 // appears at the right place in the string, then assume we are
1685 // installed in a JDK and we're done. Otherwise, check for a
1686 // JAVA_HOME environment variable and construct a path to the JVM
1687 // being overridden.
1688
1689 const char *p = buf + strlen(buf) - 1;
1690 for (int count = 0; p > buf && count < 5; ++count) {
1691 for (--p; p > buf && *p != '/'; --p)
1692 /* empty */ ;
1693 }
1694
1695 if (strncmp(p, "/jre/lib/", 9) != 0) {
1696 // Look for JAVA_HOME in the environment.
1697 char* java_home_var = ::getenv("JAVA_HOME");
1698 if (java_home_var != NULL && java_home_var[0] != 0) {
1699 char* jrelib_p;
1700 int len;
1701
1702 // Check the current module name "libjvm"
1703 p = strrchr(buf, '/');
1704 assert(strstr(p, "/libjvm") == p, "invalid library name");
1705
1706 rp = os::Posix::realpath(java_home_var, buf, buflen);
1707 if (rp == NULL) {
1708 return;
1709 }
1710
1711 // determine if this is a legacy image or modules image
1712 // modules image doesn't have "jre" subdirectory
1713 len = strlen(buf);
1714 assert(len < buflen, "Ran out of buffer space");
1715 jrelib_p = buf + len;
1716
1717 // Add the appropriate library subdir
1718 snprintf(jrelib_p, buflen-len, "/jre/lib");
1719 if (0 != access(buf, F_OK)) {
1720 snprintf(jrelib_p, buflen-len, "/lib");
1721 }
1722
1723 // Add the appropriate client or server subdir
1724 len = strlen(buf);
1725 jrelib_p = buf + len;
1726 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1727 if (0 != access(buf, F_OK)) {
1728 snprintf(jrelib_p, buflen-len, "%s", "");
1729 }
1730
1731 // If the path exists within JAVA_HOME, add the JVM library name
1732 // to complete the path to JVM being overridden. Otherwise fallback
1733 // to the path to the current library.
1734 if (0 == access(buf, F_OK)) {
1735 // Use current module name "libjvm"
1736 len = strlen(buf);
1737 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1738 } else {
1739 // Fall back to path of current library
1740 rp = os::Posix::realpath(dli_fname, buf, buflen);
1741 if (rp == NULL) {
1742 return;
1743 }
1744 }
1745 }
1746 }
1747 }
1748
1749 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1750 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1751 }
1752
1753 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1754 // no prefix required, not even "_"
1755 }
1756
1757 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1758 // no suffix required
1759 }
1760
1761 ////////////////////////////////////////////////////////////////////////////////
1762 // sun.misc.Signal support
1763
1764 static void UserHandler(int sig, void *siginfo, void *context) {
1765 // Ctrl-C is pressed during error reporting, likely because the error
1766 // handler fails to abort. Let VM die immediately.
1767 if (sig == SIGINT && VMError::is_error_reported()) {
1768 os::die();
1769 }
1770
1771 os::signal_notify(sig);
1772 }
1773
1774 void* os::user_handler() {
1775 return CAST_FROM_FN_PTR(void*, UserHandler);
1776 }
1777
1778 extern "C" {
1779 typedef void (*sa_handler_t)(int);
1780 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1781 }
1782
1783 void* os::signal(int signal_number, void* handler) {
1784 struct sigaction sigAct, oldSigAct;
1785
1786 sigfillset(&(sigAct.sa_mask));
1787 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1788 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1789
1790 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1791 // -1 means registration failed
1792 return (void *)-1;
1793 }
1794
1795 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1796 }
1797
1798 void os::signal_raise(int signal_number) {
1799 ::raise(signal_number);
1800 }
1801
1802 // The following code is moved from os.cpp for making this
1803 // code platform specific, which it is by its very nature.
1804
1805 // Will be modified when max signal is changed to be dynamic
1806 int os::sigexitnum_pd() {
1807 return NSIG;
1808 }
1809
1810 // a counter for each possible signal value
1811 static volatile jint pending_signals[NSIG+1] = { 0 };
1812 static Semaphore* sig_sem = NULL;
1813
1814 static void jdk_misc_signal_init() {
1815 // Initialize signal structures
1816 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1817
1818 // Initialize signal semaphore
1819 sig_sem = new Semaphore();
1820 }
1821
1822 void os::signal_notify(int sig) {
1823 if (sig_sem != NULL) {
1824 Atomic::inc(&pending_signals[sig]);
1825 sig_sem->signal();
1826 } else {
1827 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1828 // initialization isn't called.
1829 assert(ReduceSignalUsage, "signal semaphore should be created");
1830 }
1831 }
1832
1833 static int check_pending_signals() {
1834 for (;;) {
1835 for (int i = 0; i < NSIG + 1; i++) {
1836 jint n = pending_signals[i];
1837 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1838 return i;
1839 }
1840 }
1841 JavaThread *thread = JavaThread::current();
1842 ThreadBlockInVM tbivm(thread);
1843
1844 bool threadIsSuspended;
1845 do {
1846 thread->set_suspend_equivalent();
1847 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1848 sig_sem->wait();
1849
1850 // were we externally suspended while we were waiting?
1851 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1852 if (threadIsSuspended) {
1853 // The semaphore has been incremented, but while we were waiting
1854 // another thread suspended us. We don't want to continue running
1855 // while suspended because that would surprise the thread that
1856 // suspended us.
1857 sig_sem->signal();
1858
1859 thread->java_suspend_self();
1860 }
1861 } while (threadIsSuspended);
1862 }
1863 }
1864
1865 int os::signal_wait() {
1866 return check_pending_signals();
1867 }
1868
1869 ////////////////////////////////////////////////////////////////////////////////
1870 // Virtual Memory
1871
1872 int os::vm_page_size() {
1873 // Seems redundant as all get out
1874 assert(os::Bsd::page_size() != -1, "must call os::init");
1875 return os::Bsd::page_size();
1876 }
1877
1878 // Solaris allocates memory by pages.
1879 int os::vm_allocation_granularity() {
1880 assert(os::Bsd::page_size() != -1, "must call os::init");
1881 return os::Bsd::page_size();
1882 }
1883
1884 // Rationale behind this function:
1885 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1886 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1887 // samples for JITted code. Here we create private executable mapping over the code cache
1888 // and then we can use standard (well, almost, as mapping can change) way to provide
1889 // info for the reporting script by storing timestamp and location of symbol
1890 void bsd_wrap_code(char* base, size_t size) {
1891 static volatile jint cnt = 0;
1892
1893 if (!UseOprofile) {
1894 return;
1895 }
1896
1897 char buf[PATH_MAX + 1];
1898 int num = Atomic::add(1, &cnt);
1899
1900 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1901 os::get_temp_directory(), os::current_process_id(), num);
1902 unlink(buf);
1903
1904 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1905
1906 if (fd != -1) {
1907 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1908 if (rv != (off_t)-1) {
1909 if (::write(fd, "", 1) == 1) {
1910 mmap(base, size,
1911 PROT_READ|PROT_WRITE|PROT_EXEC,
1912 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1913 }
1914 }
1915 ::close(fd);
1916 unlink(buf);
1917 }
1918 }
1919
1920 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1921 int err) {
1922 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1923 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1924 os::errno_name(err), err);
1925 }
1926
1927 // NOTE: Bsd kernel does not really reserve the pages for us.
1928 // All it does is to check if there are enough free pages
1929 // left at the time of mmap(). This could be a potential
1930 // problem.
1931 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1932 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1933 #ifdef __OpenBSD__
1934 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1935 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1936 if (::mprotect(addr, size, prot) == 0) {
1937 return true;
1938 }
1939 #else
1940 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1941 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1942 if (res != (uintptr_t) MAP_FAILED) {
1943 return true;
1944 }
1945 #endif
1946
1947 // Warn about any commit errors we see in non-product builds just
1948 // in case mmap() doesn't work as described on the man page.
1949 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1950
1951 return false;
1952 }
1953
1954 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1955 bool exec) {
1956 // alignment_hint is ignored on this OS
1957 return pd_commit_memory(addr, size, exec);
1958 }
1959
1960 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1961 const char* mesg) {
1962 assert(mesg != NULL, "mesg must be specified");
1963 if (!pd_commit_memory(addr, size, exec)) {
1964 // add extra info in product mode for vm_exit_out_of_memory():
1965 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1966 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1967 }
1968 }
1969
1970 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1971 size_t alignment_hint, bool exec,
1972 const char* mesg) {
1973 // alignment_hint is ignored on this OS
1974 pd_commit_memory_or_exit(addr, size, exec, mesg);
1975 }
1976
1977 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1978 }
1979
1980 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
1981 ::madvise(addr, bytes, MADV_DONTNEED);
1982 }
1983
1984 void os::numa_make_global(char *addr, size_t bytes) {
1985 }
1986
1987 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
1988 }
1989
1990 bool os::numa_topology_changed() { return false; }
1991
1992 size_t os::numa_get_groups_num() {
1993 return 1;
1994 }
1995
1996 int os::numa_get_group_id() {
1997 return 0;
1998 }
1999
2000 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2001 if (size > 0) {
2002 ids[0] = 0;
2003 return 1;
2004 }
2005 return 0;
2006 }
2007
2008 int os::numa_get_group_id_for_address(const void* address) {
2009 return 0;
2010 }
2011
2012 bool os::get_page_info(char *start, page_info* info) {
2013 return false;
2014 }
2015
2016 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2017 return end;
2018 }
2019
2020
2021 bool os::pd_uncommit_memory(char* addr, size_t size) {
2022 #ifdef __OpenBSD__
2023 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2024 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2025 return ::mprotect(addr, size, PROT_NONE) == 0;
2026 #else
2027 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2028 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2029 return res != (uintptr_t) MAP_FAILED;
2030 #endif
2031 }
2032
2033 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2034 return os::commit_memory(addr, size, !ExecMem);
2035 }
2036
2037 // If this is a growable mapping, remove the guard pages entirely by
2038 // munmap()ping them. If not, just call uncommit_memory().
2039 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2040 return os::uncommit_memory(addr, size);
2041 }
2042
2043 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2044 // at 'requested_addr'. If there are existing memory mappings at the same
2045 // location, however, they will be overwritten. If 'fixed' is false,
2046 // 'requested_addr' is only treated as a hint, the return value may or
2047 // may not start from the requested address. Unlike Bsd mmap(), this
2048 // function returns NULL to indicate failure.
2049 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2050 char * addr;
2051 int flags;
2052
2053 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2054 if (fixed) {
2055 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2056 flags |= MAP_FIXED;
2057 }
2058
2059 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2060 // touch an uncommitted page. Otherwise, the read/write might
2061 // succeed if we have enough swap space to back the physical page.
2062 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2063 flags, -1, 0);
2064
2065 return addr == MAP_FAILED ? NULL : addr;
2066 }
2067
2068 static int anon_munmap(char * addr, size_t size) {
2069 return ::munmap(addr, size) == 0;
2070 }
2071
2072 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2073 size_t alignment_hint) {
2074 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2075 }
2076
2077 bool os::pd_release_memory(char* addr, size_t size) {
2078 return anon_munmap(addr, size);
2079 }
2080
2081 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2082 // Bsd wants the mprotect address argument to be page aligned.
2083 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2084
2085 // According to SUSv3, mprotect() should only be used with mappings
2086 // established by mmap(), and mmap() always maps whole pages. Unaligned
2087 // 'addr' likely indicates problem in the VM (e.g. trying to change
2088 // protection of malloc'ed or statically allocated memory). Check the
2089 // caller if you hit this assert.
2090 assert(addr == bottom, "sanity check");
2091
2092 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2093 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2094 return ::mprotect(bottom, size, prot) == 0;
2095 }
2096
2097 // Set protections specified
2098 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2099 bool is_committed) {
2100 unsigned int p = 0;
2101 switch (prot) {
2102 case MEM_PROT_NONE: p = PROT_NONE; break;
2103 case MEM_PROT_READ: p = PROT_READ; break;
2104 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2105 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2106 default:
2107 ShouldNotReachHere();
2108 }
2109 // is_committed is unused.
2110 return bsd_mprotect(addr, bytes, p);
2111 }
2112
2113 bool os::guard_memory(char* addr, size_t size) {
2114 return bsd_mprotect(addr, size, PROT_NONE);
2115 }
2116
2117 bool os::unguard_memory(char* addr, size_t size) {
2118 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2119 }
2120
2121 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2122 return false;
2123 }
2124
2125 // Large page support
2126
2127 static size_t _large_page_size = 0;
2128
2129 void os::large_page_init() {
2130 }
2131
2132
2133 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2134 fatal("os::reserve_memory_special should not be called on BSD.");
2135 return NULL;
2136 }
2137
2138 bool os::release_memory_special(char* base, size_t bytes) {
2139 fatal("os::release_memory_special should not be called on BSD.");
2140 return false;
2141 }
2142
2143 size_t os::large_page_size() {
2144 return _large_page_size;
2145 }
2146
2147 bool os::can_commit_large_page_memory() {
2148 // Does not matter, we do not support huge pages.
2149 return false;
2150 }
2151
2152 bool os::can_execute_large_page_memory() {
2153 // Does not matter, we do not support huge pages.
2154 return false;
2155 }
2156
2157 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2158 assert(file_desc >= 0, "file_desc is not valid");
2159 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2160 if (result != NULL) {
2161 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2162 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2163 }
2164 }
2165 return result;
2166 }
2167
2168 // Reserve memory at an arbitrary address, only if that area is
2169 // available (and not reserved for something else).
2170
2171 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2172 // Assert only that the size is a multiple of the page size, since
2173 // that's all that mmap requires, and since that's all we really know
2174 // about at this low abstraction level. If we need higher alignment,
2175 // we can either pass an alignment to this method or verify alignment
2176 // in one of the methods further up the call chain. See bug 5044738.
2177 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2178
2179 // Repeatedly allocate blocks until the block is allocated at the
2180 // right spot.
2181
2182 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2183 // if kernel honors the hint then we can return immediately.
2184 char * addr = anon_mmap(requested_addr, bytes, false);
2185 if (addr == requested_addr) {
2186 return requested_addr;
2187 }
2188
2189 if (addr != NULL) {
2190 // mmap() is successful but it fails to reserve at the requested address
2191 anon_munmap(addr, bytes);
2192 }
2193
2194 return NULL;
2195 }
2196
2197 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2198 void os::infinite_sleep() {
2199 while (true) { // sleep forever ...
2200 ::sleep(100); // ... 100 seconds at a time
2201 }
2202 }
2203
2204 // Used to convert frequent JVM_Yield() to nops
2205 bool os::dont_yield() {
2206 return DontYieldALot;
2207 }
2208
2209 void os::naked_yield() {
2210 sched_yield();
2211 }
2212
2213 ////////////////////////////////////////////////////////////////////////////////
2214 // thread priority support
2215
2216 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2217 // only supports dynamic priority, static priority must be zero. For real-time
2218 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2219 // However, for large multi-threaded applications, SCHED_RR is not only slower
2220 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2221 // of 5 runs - Sep 2005).
2222 //
2223 // The following code actually changes the niceness of kernel-thread/LWP. It
2224 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2225 // not the entire user process, and user level threads are 1:1 mapped to kernel
2226 // threads. It has always been the case, but could change in the future. For
2227 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2228 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2229 // (e.g., root privilege or CAP_SYS_NICE capability).
2230
2231 #if !defined(__APPLE__)
2232 int os::java_to_os_priority[CriticalPriority + 1] = {
2233 19, // 0 Entry should never be used
2234
2235 0, // 1 MinPriority
2236 3, // 2
2237 6, // 3
2238
2239 10, // 4
2240 15, // 5 NormPriority
2241 18, // 6
2242
2243 21, // 7
2244 25, // 8
2245 28, // 9 NearMaxPriority
2246
2247 31, // 10 MaxPriority
2248
2249 31 // 11 CriticalPriority
2250 };
2251 #else
2252 // Using Mach high-level priority assignments
2253 int os::java_to_os_priority[CriticalPriority + 1] = {
2254 0, // 0 Entry should never be used (MINPRI_USER)
2255
2256 27, // 1 MinPriority
2257 28, // 2
2258 29, // 3
2259
2260 30, // 4
2261 31, // 5 NormPriority (BASEPRI_DEFAULT)
2262 32, // 6
2263
2264 33, // 7
2265 34, // 8
2266 35, // 9 NearMaxPriority
2267
2268 36, // 10 MaxPriority
2269
2270 36 // 11 CriticalPriority
2271 };
2272 #endif
2273
2274 static int prio_init() {
2275 if (ThreadPriorityPolicy == 1) {
2276 if (geteuid() != 0) {
2277 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2278 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2279 "e.g., being the root user. If the necessary permission is not " \
2280 "possessed, changes to priority will be silently ignored.");
2281 }
2282 }
2283 }
2284 if (UseCriticalJavaThreadPriority) {
2285 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2286 }
2287 return 0;
2288 }
2289
2290 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2291 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2292
2293 #ifdef __OpenBSD__
2294 // OpenBSD pthread_setprio starves low priority threads
2295 return OS_OK;
2296 #elif defined(__FreeBSD__)
2297 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2298 return (ret == 0) ? OS_OK : OS_ERR;
2299 #elif defined(__APPLE__) || defined(__NetBSD__)
2300 struct sched_param sp;
2301 int policy;
2302
2303 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2304 return OS_ERR;
2305 }
2306
2307 sp.sched_priority = newpri;
2308 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2309 return OS_ERR;
2310 }
2311
2312 return OS_OK;
2313 #else
2314 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2315 return (ret == 0) ? OS_OK : OS_ERR;
2316 #endif
2317 }
2318
2319 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2320 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2321 *priority_ptr = java_to_os_priority[NormPriority];
2322 return OS_OK;
2323 }
2324
2325 errno = 0;
2326 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2327 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2328 #elif defined(__APPLE__) || defined(__NetBSD__)
2329 int policy;
2330 struct sched_param sp;
2331
2332 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2333 if (res != 0) {
2334 *priority_ptr = -1;
2335 return OS_ERR;
2336 } else {
2337 *priority_ptr = sp.sched_priority;
2338 return OS_OK;
2339 }
2340 #else
2341 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2342 #endif
2343 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2344 }
2345
2346 ////////////////////////////////////////////////////////////////////////////////
2347 // suspend/resume support
2348
2349 // The low-level signal-based suspend/resume support is a remnant from the
2350 // old VM-suspension that used to be for java-suspension, safepoints etc,
2351 // within hotspot. Currently used by JFR's OSThreadSampler
2352 //
2353 // The remaining code is greatly simplified from the more general suspension
2354 // code that used to be used.
2355 //
2356 // The protocol is quite simple:
2357 // - suspend:
2358 // - sends a signal to the target thread
2359 // - polls the suspend state of the osthread using a yield loop
2360 // - target thread signal handler (SR_handler) sets suspend state
2361 // and blocks in sigsuspend until continued
2362 // - resume:
2363 // - sets target osthread state to continue
2364 // - sends signal to end the sigsuspend loop in the SR_handler
2365 //
2366 // Note that the SR_lock plays no role in this suspend/resume protocol,
2367 // but is checked for NULL in SR_handler as a thread termination indicator.
2368 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2369 //
2370 // Note that resume_clear_context() and suspend_save_context() are needed
2371 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2372 // which in part is used by:
2373 // - Forte Analyzer: AsyncGetCallTrace()
2374 // - StackBanging: get_frame_at_stack_banging_point()
2375
2376 static void resume_clear_context(OSThread *osthread) {
2377 osthread->set_ucontext(NULL);
2378 osthread->set_siginfo(NULL);
2379 }
2380
2381 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2382 osthread->set_ucontext(context);
2383 osthread->set_siginfo(siginfo);
2384 }
2385
2386 // Handler function invoked when a thread's execution is suspended or
2387 // resumed. We have to be careful that only async-safe functions are
2388 // called here (Note: most pthread functions are not async safe and
2389 // should be avoided.)
2390 //
2391 // Note: sigwait() is a more natural fit than sigsuspend() from an
2392 // interface point of view, but sigwait() prevents the signal hander
2393 // from being run. libpthread would get very confused by not having
2394 // its signal handlers run and prevents sigwait()'s use with the
2395 // mutex granting granting signal.
2396 //
2397 // Currently only ever called on the VMThread or JavaThread
2398 //
2399 #ifdef __APPLE__
2400 static OSXSemaphore sr_semaphore;
2401 #else
2402 static PosixSemaphore sr_semaphore;
2403 #endif
2404
2405 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2406 // Save and restore errno to avoid confusing native code with EINTR
2407 // after sigsuspend.
2408 int old_errno = errno;
2409
2410 Thread* thread = Thread::current_or_null_safe();
2411 assert(thread != NULL, "Missing current thread in SR_handler");
2412
2413 // On some systems we have seen signal delivery get "stuck" until the signal
2414 // mask is changed as part of thread termination. Check that the current thread
2415 // has not already terminated (via SR_lock()) - else the following assertion
2416 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2417 // destructor has completed.
2418
2419 if (thread->SR_lock() == NULL) {
2420 return;
2421 }
2422
2423 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2424
2425 OSThread* osthread = thread->osthread();
2426
2427 os::SuspendResume::State current = osthread->sr.state();
2428 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2429 suspend_save_context(osthread, siginfo, context);
2430
2431 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2432 os::SuspendResume::State state = osthread->sr.suspended();
2433 if (state == os::SuspendResume::SR_SUSPENDED) {
2434 sigset_t suspend_set; // signals for sigsuspend()
2435
2436 // get current set of blocked signals and unblock resume signal
2437 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2438 sigdelset(&suspend_set, SR_signum);
2439
2440 sr_semaphore.signal();
2441 // wait here until we are resumed
2442 while (1) {
2443 sigsuspend(&suspend_set);
2444
2445 os::SuspendResume::State result = osthread->sr.running();
2446 if (result == os::SuspendResume::SR_RUNNING) {
2447 sr_semaphore.signal();
2448 break;
2449 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2450 ShouldNotReachHere();
2451 }
2452 }
2453
2454 } else if (state == os::SuspendResume::SR_RUNNING) {
2455 // request was cancelled, continue
2456 } else {
2457 ShouldNotReachHere();
2458 }
2459
2460 resume_clear_context(osthread);
2461 } else if (current == os::SuspendResume::SR_RUNNING) {
2462 // request was cancelled, continue
2463 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2464 // ignore
2465 } else {
2466 // ignore
2467 }
2468
2469 errno = old_errno;
2470 }
2471
2472
2473 static int SR_initialize() {
2474 struct sigaction act;
2475 char *s;
2476 // Get signal number to use for suspend/resume
2477 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2478 int sig = ::strtol(s, 0, 10);
2479 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2480 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2481 SR_signum = sig;
2482 } else {
2483 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2484 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2485 }
2486 }
2487
2488 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2489 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2490
2491 sigemptyset(&SR_sigset);
2492 sigaddset(&SR_sigset, SR_signum);
2493
2494 // Set up signal handler for suspend/resume
2495 act.sa_flags = SA_RESTART|SA_SIGINFO;
2496 act.sa_handler = (void (*)(int)) SR_handler;
2497
2498 // SR_signum is blocked by default.
2499 // 4528190 - We also need to block pthread restart signal (32 on all
2500 // supported Bsd platforms). Note that BsdThreads need to block
2501 // this signal for all threads to work properly. So we don't have
2502 // to use hard-coded signal number when setting up the mask.
2503 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2504
2505 if (sigaction(SR_signum, &act, 0) == -1) {
2506 return -1;
2507 }
2508
2509 // Save signal flag
2510 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2511 return 0;
2512 }
2513
2514 static int sr_notify(OSThread* osthread) {
2515 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2516 assert_status(status == 0, status, "pthread_kill");
2517 return status;
2518 }
2519
2520 // "Randomly" selected value for how long we want to spin
2521 // before bailing out on suspending a thread, also how often
2522 // we send a signal to a thread we want to resume
2523 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2524 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2525
2526 // returns true on success and false on error - really an error is fatal
2527 // but this seems the normal response to library errors
2528 static bool do_suspend(OSThread* osthread) {
2529 assert(osthread->sr.is_running(), "thread should be running");
2530 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2531
2532 // mark as suspended and send signal
2533 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2534 // failed to switch, state wasn't running?
2535 ShouldNotReachHere();
2536 return false;
2537 }
2538
2539 if (sr_notify(osthread) != 0) {
2540 ShouldNotReachHere();
2541 }
2542
2543 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2544 while (true) {
2545 if (sr_semaphore.timedwait(2)) {
2546 break;
2547 } else {
2548 // timeout
2549 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2550 if (cancelled == os::SuspendResume::SR_RUNNING) {
2551 return false;
2552 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2553 // make sure that we consume the signal on the semaphore as well
2554 sr_semaphore.wait();
2555 break;
2556 } else {
2557 ShouldNotReachHere();
2558 return false;
2559 }
2560 }
2561 }
2562
2563 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2564 return true;
2565 }
2566
2567 static void do_resume(OSThread* osthread) {
2568 assert(osthread->sr.is_suspended(), "thread should be suspended");
2569 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2570
2571 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2572 // failed to switch to WAKEUP_REQUEST
2573 ShouldNotReachHere();
2574 return;
2575 }
2576
2577 while (true) {
2578 if (sr_notify(osthread) == 0) {
2579 if (sr_semaphore.timedwait(2)) {
2580 if (osthread->sr.is_running()) {
2581 return;
2582 }
2583 }
2584 } else {
2585 ShouldNotReachHere();
2586 }
2587 }
2588
2589 guarantee(osthread->sr.is_running(), "Must be running!");
2590 }
2591
2592 ///////////////////////////////////////////////////////////////////////////////////
2593 // signal handling (except suspend/resume)
2594
2595 // This routine may be used by user applications as a "hook" to catch signals.
2596 // The user-defined signal handler must pass unrecognized signals to this
2597 // routine, and if it returns true (non-zero), then the signal handler must
2598 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2599 // routine will never retun false (zero), but instead will execute a VM panic
2600 // routine kill the process.
2601 //
2602 // If this routine returns false, it is OK to call it again. This allows
2603 // the user-defined signal handler to perform checks either before or after
2604 // the VM performs its own checks. Naturally, the user code would be making
2605 // a serious error if it tried to handle an exception (such as a null check
2606 // or breakpoint) that the VM was generating for its own correct operation.
2607 //
2608 // This routine may recognize any of the following kinds of signals:
2609 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2610 // It should be consulted by handlers for any of those signals.
2611 //
2612 // The caller of this routine must pass in the three arguments supplied
2613 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2614 // field of the structure passed to sigaction(). This routine assumes that
2615 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2616 //
2617 // Note that the VM will print warnings if it detects conflicting signal
2618 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2619 //
2620 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2621 void* ucontext,
2622 int abort_if_unrecognized);
2623
2624 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2625 assert(info != NULL && uc != NULL, "it must be old kernel");
2626 int orig_errno = errno; // Preserve errno value over signal handler.
2627 JVM_handle_bsd_signal(sig, info, uc, true);
2628 errno = orig_errno;
2629 }
2630
2631
2632 // This boolean allows users to forward their own non-matching signals
2633 // to JVM_handle_bsd_signal, harmlessly.
2634 bool os::Bsd::signal_handlers_are_installed = false;
2635
2636 // For signal-chaining
2637 bool os::Bsd::libjsig_is_loaded = false;
2638 typedef struct sigaction *(*get_signal_t)(int);
2639 get_signal_t os::Bsd::get_signal_action = NULL;
2640
2641 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2642 struct sigaction *actp = NULL;
2643
2644 if (libjsig_is_loaded) {
2645 // Retrieve the old signal handler from libjsig
2646 actp = (*get_signal_action)(sig);
2647 }
2648 if (actp == NULL) {
2649 // Retrieve the preinstalled signal handler from jvm
2650 actp = os::Posix::get_preinstalled_handler(sig);
2651 }
2652
2653 return actp;
2654 }
2655
2656 static bool call_chained_handler(struct sigaction *actp, int sig,
2657 siginfo_t *siginfo, void *context) {
2658 // Call the old signal handler
2659 if (actp->sa_handler == SIG_DFL) {
2660 // It's more reasonable to let jvm treat it as an unexpected exception
2661 // instead of taking the default action.
2662 return false;
2663 } else if (actp->sa_handler != SIG_IGN) {
2664 if ((actp->sa_flags & SA_NODEFER) == 0) {
2665 // automaticlly block the signal
2666 sigaddset(&(actp->sa_mask), sig);
2667 }
2668
2669 sa_handler_t hand;
2670 sa_sigaction_t sa;
2671 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2672 // retrieve the chained handler
2673 if (siginfo_flag_set) {
2674 sa = actp->sa_sigaction;
2675 } else {
2676 hand = actp->sa_handler;
2677 }
2678
2679 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2680 actp->sa_handler = SIG_DFL;
2681 }
2682
2683 // try to honor the signal mask
2684 sigset_t oset;
2685 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2686
2687 // call into the chained handler
2688 if (siginfo_flag_set) {
2689 (*sa)(sig, siginfo, context);
2690 } else {
2691 (*hand)(sig);
2692 }
2693
2694 // restore the signal mask
2695 pthread_sigmask(SIG_SETMASK, &oset, 0);
2696 }
2697 // Tell jvm's signal handler the signal is taken care of.
2698 return true;
2699 }
2700
2701 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2702 bool chained = false;
2703 // signal-chaining
2704 if (UseSignalChaining) {
2705 struct sigaction *actp = get_chained_signal_action(sig);
2706 if (actp != NULL) {
2707 chained = call_chained_handler(actp, sig, siginfo, context);
2708 }
2709 }
2710 return chained;
2711 }
2712
2713 // for diagnostic
2714 int sigflags[NSIG];
2715
2716 int os::Bsd::get_our_sigflags(int sig) {
2717 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2718 return sigflags[sig];
2719 }
2720
2721 void os::Bsd::set_our_sigflags(int sig, int flags) {
2722 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2723 if (sig > 0 && sig < NSIG) {
2724 sigflags[sig] = flags;
2725 }
2726 }
2727
2728 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2729 // Check for overwrite.
2730 struct sigaction oldAct;
2731 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2732
2733 void* oldhand = oldAct.sa_sigaction
2734 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2735 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2736 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2737 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2738 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2739 if (AllowUserSignalHandlers || !set_installed) {
2740 // Do not overwrite; user takes responsibility to forward to us.
2741 return;
2742 } else if (UseSignalChaining) {
2743 // save the old handler in jvm
2744 os::Posix::save_preinstalled_handler(sig, oldAct);
2745 // libjsig also interposes the sigaction() call below and saves the
2746 // old sigaction on it own.
2747 } else {
2748 fatal("Encountered unexpected pre-existing sigaction handler "
2749 "%#lx for signal %d.", (long)oldhand, sig);
2750 }
2751 }
2752
2753 struct sigaction sigAct;
2754 sigfillset(&(sigAct.sa_mask));
2755 sigAct.sa_handler = SIG_DFL;
2756 if (!set_installed) {
2757 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2758 } else {
2759 sigAct.sa_sigaction = signalHandler;
2760 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2761 }
2762 #ifdef __APPLE__
2763 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2764 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2765 // if the signal handler declares it will handle it on alternate stack.
2766 // Notice we only declare we will handle it on alt stack, but we are not
2767 // actually going to use real alt stack - this is just a workaround.
2768 // Please see ux_exception.c, method catch_mach_exception_raise for details
2769 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2770 if (sig == SIGSEGV) {
2771 sigAct.sa_flags |= SA_ONSTACK;
2772 }
2773 #endif
2774
2775 // Save flags, which are set by ours
2776 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2777 sigflags[sig] = sigAct.sa_flags;
2778
2779 int ret = sigaction(sig, &sigAct, &oldAct);
2780 assert(ret == 0, "check");
2781
2782 void* oldhand2 = oldAct.sa_sigaction
2783 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2784 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2785 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2786 }
2787
2788 // install signal handlers for signals that HotSpot needs to
2789 // handle in order to support Java-level exception handling.
2790
2791 void os::Bsd::install_signal_handlers() {
2792 if (!signal_handlers_are_installed) {
2793 signal_handlers_are_installed = true;
2794
2795 // signal-chaining
2796 typedef void (*signal_setting_t)();
2797 signal_setting_t begin_signal_setting = NULL;
2798 signal_setting_t end_signal_setting = NULL;
2799 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2800 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2801 if (begin_signal_setting != NULL) {
2802 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2803 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2804 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2805 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2806 libjsig_is_loaded = true;
2807 assert(UseSignalChaining, "should enable signal-chaining");
2808 }
2809 if (libjsig_is_loaded) {
2810 // Tell libjsig jvm is setting signal handlers
2811 (*begin_signal_setting)();
2812 }
2813
2814 set_signal_handler(SIGSEGV, true);
2815 set_signal_handler(SIGPIPE, true);
2816 set_signal_handler(SIGBUS, true);
2817 set_signal_handler(SIGILL, true);
2818 set_signal_handler(SIGFPE, true);
2819 set_signal_handler(SIGXFSZ, true);
2820
2821 #if defined(__APPLE__)
2822 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2823 // signals caught and handled by the JVM. To work around this, we reset the mach task
2824 // signal handler that's placed on our process by CrashReporter. This disables
2825 // CrashReporter-based reporting.
2826 //
2827 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2828 // on caught fatal signals.
2829 //
2830 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2831 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2832 // exception handling, while leaving the standard BSD signal handlers functional.
2833 kern_return_t kr;
2834 kr = task_set_exception_ports(mach_task_self(),
2835 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2836 MACH_PORT_NULL,
2837 EXCEPTION_STATE_IDENTITY,
2838 MACHINE_THREAD_STATE);
2839
2840 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2841 #endif
2842
2843 if (libjsig_is_loaded) {
2844 // Tell libjsig jvm finishes setting signal handlers
2845 (*end_signal_setting)();
2846 }
2847
2848 // We don't activate signal checker if libjsig is in place, we trust ourselves
2849 // and if UserSignalHandler is installed all bets are off
2850 if (CheckJNICalls) {
2851 if (libjsig_is_loaded) {
2852 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
2853 check_signals = false;
2854 }
2855 if (AllowUserSignalHandlers) {
2856 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2857 check_signals = false;
2858 }
2859 }
2860 }
2861 }
2862
2863
2864 /////
2865 // glibc on Bsd platform uses non-documented flag
2866 // to indicate, that some special sort of signal
2867 // trampoline is used.
2868 // We will never set this flag, and we should
2869 // ignore this flag in our diagnostic
2870 #ifdef SIGNIFICANT_SIGNAL_MASK
2871 #undef SIGNIFICANT_SIGNAL_MASK
2872 #endif
2873 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2874
2875 static const char* get_signal_handler_name(address handler,
2876 char* buf, int buflen) {
2877 int offset;
2878 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2879 if (found) {
2880 // skip directory names
2881 const char *p1, *p2;
2882 p1 = buf;
2883 size_t len = strlen(os::file_separator());
2884 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2885 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2886 } else {
2887 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2888 }
2889 return buf;
2890 }
2891
2892 static void print_signal_handler(outputStream* st, int sig,
2893 char* buf, size_t buflen) {
2894 struct sigaction sa;
2895
2896 sigaction(sig, NULL, &sa);
2897
2898 // See comment for SIGNIFICANT_SIGNAL_MASK define
2899 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2900
2901 st->print("%s: ", os::exception_name(sig, buf, buflen));
2902
2903 address handler = (sa.sa_flags & SA_SIGINFO)
2904 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2905 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2906
2907 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2908 st->print("SIG_DFL");
2909 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2910 st->print("SIG_IGN");
2911 } else {
2912 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2913 }
2914
2915 st->print(", sa_mask[0]=");
2916 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2917
2918 address rh = VMError::get_resetted_sighandler(sig);
2919 // May be, handler was resetted by VMError?
2920 if (rh != NULL) {
2921 handler = rh;
2922 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2923 }
2924
2925 st->print(", sa_flags=");
2926 os::Posix::print_sa_flags(st, sa.sa_flags);
2927
2928 // Check: is it our handler?
2929 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2930 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2931 // It is our signal handler
2932 // check for flags, reset system-used one!
2933 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2934 st->print(
2935 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2936 os::Bsd::get_our_sigflags(sig));
2937 }
2938 }
2939 st->cr();
2940 }
2941
2942
2943 #define DO_SIGNAL_CHECK(sig) \
2944 do { \
2945 if (!sigismember(&check_signal_done, sig)) { \
2946 os::Bsd::check_signal_handler(sig); \
2947 } \
2948 } while (0)
2949
2950 // This method is a periodic task to check for misbehaving JNI applications
2951 // under CheckJNI, we can add any periodic checks here
2952
2953 void os::run_periodic_checks() {
2954
2955 if (check_signals == false) return;
2956
2957 // SEGV and BUS if overridden could potentially prevent
2958 // generation of hs*.log in the event of a crash, debugging
2959 // such a case can be very challenging, so we absolutely
2960 // check the following for a good measure:
2961 DO_SIGNAL_CHECK(SIGSEGV);
2962 DO_SIGNAL_CHECK(SIGILL);
2963 DO_SIGNAL_CHECK(SIGFPE);
2964 DO_SIGNAL_CHECK(SIGBUS);
2965 DO_SIGNAL_CHECK(SIGPIPE);
2966 DO_SIGNAL_CHECK(SIGXFSZ);
2967
2968
2969 // ReduceSignalUsage allows the user to override these handlers
2970 // see comments at the very top and jvm_md.h
2971 if (!ReduceSignalUsage) {
2972 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
2973 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
2974 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
2975 DO_SIGNAL_CHECK(BREAK_SIGNAL);
2976 }
2977
2978 DO_SIGNAL_CHECK(SR_signum);
2979 }
2980
2981 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
2982
2983 static os_sigaction_t os_sigaction = NULL;
2984
2985 void os::Bsd::check_signal_handler(int sig) {
2986 char buf[O_BUFLEN];
2987 address jvmHandler = NULL;
2988
2989
2990 struct sigaction act;
2991 if (os_sigaction == NULL) {
2992 // only trust the default sigaction, in case it has been interposed
2993 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
2994 if (os_sigaction == NULL) return;
2995 }
2996
2997 os_sigaction(sig, (struct sigaction*)NULL, &act);
2998
2999
3000 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3001
3002 address thisHandler = (act.sa_flags & SA_SIGINFO)
3003 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3004 : CAST_FROM_FN_PTR(address, act.sa_handler);
3005
3006
3007 switch (sig) {
3008 case SIGSEGV:
3009 case SIGBUS:
3010 case SIGFPE:
3011 case SIGPIPE:
3012 case SIGILL:
3013 case SIGXFSZ:
3014 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3015 break;
3016
3017 case SHUTDOWN1_SIGNAL:
3018 case SHUTDOWN2_SIGNAL:
3019 case SHUTDOWN3_SIGNAL:
3020 case BREAK_SIGNAL:
3021 jvmHandler = (address)user_handler();
3022 break;
3023
3024 default:
3025 if (sig == SR_signum) {
3026 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3027 } else {
3028 return;
3029 }
3030 break;
3031 }
3032
3033 if (thisHandler != jvmHandler) {
3034 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3035 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3036 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3037 // No need to check this sig any longer
3038 sigaddset(&check_signal_done, sig);
3039 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3040 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3041 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3042 exception_name(sig, buf, O_BUFLEN));
3043 }
3044 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3045 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3046 tty->print("expected:");
3047 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3048 tty->cr();
3049 tty->print(" found:");
3050 os::Posix::print_sa_flags(tty, act.sa_flags);
3051 tty->cr();
3052 // No need to check this sig any longer
3053 sigaddset(&check_signal_done, sig);
3054 }
3055
3056 // Dump all the signal
3057 if (sigismember(&check_signal_done, sig)) {
3058 print_signal_handlers(tty, buf, O_BUFLEN);
3059 }
3060 }
3061
3062 extern void report_error(char* file_name, int line_no, char* title,
3063 char* format, ...);
3064
3065 // this is called _before_ the most of global arguments have been parsed
3066 void os::init(void) {
3067 char dummy; // used to get a guess on initial stack address
3068
3069 clock_tics_per_sec = CLK_TCK;
3070
3071 init_random(1234567);
3072
3073 Bsd::set_page_size(getpagesize());
3074 if (Bsd::page_size() == -1) {
3075 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3076 }
3077 init_page_sizes((size_t) Bsd::page_size());
3078
3079 Bsd::initialize_system_info();
3080
3081 // _main_thread points to the thread that created/loaded the JVM.
3082 Bsd::_main_thread = pthread_self();
3083
3084 Bsd::clock_init();
3085 initial_time_count = javaTimeNanos();
3086
3087 os::Posix::init();
3088 }
3089
3090 // To install functions for atexit system call
3091 extern "C" {
3092 static void perfMemory_exit_helper() {
3093 perfMemory_exit();
3094 }
3095 }
3096
3097 // this is called _after_ the global arguments have been parsed
3098 jint os::init_2(void) {
3099
3100 // This could be set after os::Posix::init() but all platforms
3101 // have to set it the same so we have to mirror Solaris.
3102 DEBUG_ONLY(os::set_mutex_init_done();)
3103
3104 os::Posix::init_2();
3105
3106 // initialize suspend/resume support - must do this before signal_sets_init()
3107 if (SR_initialize() != 0) {
3108 perror("SR_initialize failed");
3109 return JNI_ERR;
3110 }
3111
3112 Bsd::signal_sets_init();
3113 Bsd::install_signal_handlers();
3114 // Initialize data for jdk.internal.misc.Signal
3115 if (!ReduceSignalUsage) {
3116 jdk_misc_signal_init();
3117 }
3118
3119 // Check and sets minimum stack sizes against command line options
3120 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3121 return JNI_ERR;
3122 }
3123
3124 if (MaxFDLimit) {
3125 // set the number of file descriptors to max. print out error
3126 // if getrlimit/setrlimit fails but continue regardless.
3127 struct rlimit nbr_files;
3128 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3129 if (status != 0) {
3130 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3131 } else {
3132 nbr_files.rlim_cur = nbr_files.rlim_max;
3133
3134 #ifdef __APPLE__
3135 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3136 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3137 // be used instead
3138 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3139 #endif
3140
3141 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3142 if (status != 0) {
3143 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3144 }
3145 }
3146 }
3147
3148 // at-exit methods are called in the reverse order of their registration.
3149 // atexit functions are called on return from main or as a result of a
3150 // call to exit(3C). There can be only 32 of these functions registered
3151 // and atexit() does not set errno.
3152
3153 if (PerfAllowAtExitRegistration) {
3154 // only register atexit functions if PerfAllowAtExitRegistration is set.
3155 // atexit functions can be delayed until process exit time, which
3156 // can be problematic for embedded VM situations. Embedded VMs should
3157 // call DestroyJavaVM() to assure that VM resources are released.
3158
3159 // note: perfMemory_exit_helper atexit function may be removed in
3160 // the future if the appropriate cleanup code can be added to the
3161 // VM_Exit VMOperation's doit method.
3162 if (atexit(perfMemory_exit_helper) != 0) {
3163 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3164 }
3165 }
3166
3167 // initialize thread priority policy
3168 prio_init();
3169
3170 #ifdef __APPLE__
3171 // dynamically link to objective c gc registration
3172 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3173 if (handleLibObjc != NULL) {
3174 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3175 }
3176 #endif
3177
3178 return JNI_OK;
3179 }
3180
3181 // Mark the polling page as unreadable
3182 void os::make_polling_page_unreadable(void) {
3183 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3184 fatal("Could not disable polling page");
3185 }
3186 }
3187
3188 // Mark the polling page as readable
3189 void os::make_polling_page_readable(void) {
3190 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3191 fatal("Could not enable polling page");
3192 }
3193 }
3194
3195 int os::active_processor_count() {
3196 // User has overridden the number of active processors
3197 if (ActiveProcessorCount > 0) {
3198 log_trace(os)("active_processor_count: "
3199 "active processor count set by user : %d",
3200 ActiveProcessorCount);
3201 return ActiveProcessorCount;
3202 }
3203
3204 return _processor_count;
3205 }
3206
3207 #ifdef __APPLE__
3208 static volatile int* volatile apic_to_processor_mapping = NULL;
3209 static volatile int next_processor_id = 0;
3210
3211 static inline volatile int* get_apic_to_processor_mapping() {
3212 volatile int* mapping = OrderAccess::load_acquire(&apic_to_processor_mapping);
3213 if (mapping == NULL) {
3214 // Calculate possible number space for APIC ids. This space is not necessarily
3215 // in the range [0, number_of_processors).
3216 uint total_bits = 0;
3217 for (uint i = 0;; ++i) {
3218 uint eax = 0xb; // Query topology leaf
3219 uint ebx;
3220 uint ecx = i;
3221 uint edx;
3222
3223 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3224
3225 uint level_type = (ecx >> 8) & 0xFF;
3226 if (level_type == 0) {
3227 // Invalid level; end of topology
3228 break;
3229 }
3230 uint level_apic_id_shift = eax & ((1u << 5) - 1);
3231 total_bits += level_apic_id_shift;
3232 }
3233
3234 uint max_apic_ids = 1u << total_bits;
3235 mapping = NEW_C_HEAP_ARRAY(int, max_apic_ids, mtInternal);
3236
3237 for (uint i = 0; i < max_apic_ids; ++i) {
3238 mapping[i] = -1;
3239 }
3240
3241 if (!Atomic::replace_if_null(mapping, &apic_to_processor_mapping)) {
3242 FREE_C_HEAP_ARRAY(int, mapping);
3243 mapping = OrderAccess::load_acquire(&apic_to_processor_mapping);
3244 }
3245 }
3246
3247 return mapping;
3248 }
3249
3250 uint os::processor_id() {
3251 volatile int* mapping = get_apic_to_processor_mapping();
3252
3253 uint eax = 0xb;
3254 uint ebx;
3255 uint ecx = 0;
3256 uint edx;
3257
3258 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3259
3260 // Map from APIC id to a unique logical processor ID in the expected
3261 // [0, num_processors) range.
3262
3263 uint apic_id = edx;
3264 int processor_id = Atomic::load(&mapping[apic_id]);
3265
3266 while (processor_id < 0) {
3267 if (Atomic::cmpxchg(-2, &mapping[apic_id], -1)) {
3268 Atomic::store(Atomic::add(1, &next_processor_id) - 1, &mapping[apic_id]);
3269 }
3270 processor_id = Atomic::load(&mapping[apic_id]);
3271 }
3272
3273 return (uint)processor_id;
3274 }
3275 #endif
3276
3277 void os::set_native_thread_name(const char *name) {
3278 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3279 // This is only supported in Snow Leopard and beyond
3280 if (name != NULL) {
3281 // Add a "Java: " prefix to the name
3282 char buf[MAXTHREADNAMESIZE];
3283 snprintf(buf, sizeof(buf), "Java: %s", name);
3284 pthread_setname_np(buf);
3285 }
3286 #endif
3287 }
3288
3289 bool os::bind_to_processor(uint processor_id) {
3290 // Not yet implemented.
3291 return false;
3292 }
3293
3294 void os::SuspendedThreadTask::internal_do_task() {
3295 if (do_suspend(_thread->osthread())) {
3296 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3297 do_task(context);
3298 do_resume(_thread->osthread());
3299 }
3300 }
3301
3302 ////////////////////////////////////////////////////////////////////////////////
3303 // debug support
3304
3305 bool os::find(address addr, outputStream* st) {
3306 Dl_info dlinfo;
3307 memset(&dlinfo, 0, sizeof(dlinfo));
3308 if (dladdr(addr, &dlinfo) != 0) {
3309 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3310 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3311 st->print("%s+%#x", dlinfo.dli_sname,
3312 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3313 } else if (dlinfo.dli_fbase != NULL) {
3314 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3315 } else {
3316 st->print("<absolute address>");
3317 }
3318 if (dlinfo.dli_fname != NULL) {
3319 st->print(" in %s", dlinfo.dli_fname);
3320 }
3321 if (dlinfo.dli_fbase != NULL) {
3322 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3323 }
3324 st->cr();
3325
3326 if (Verbose) {
3327 // decode some bytes around the PC
3328 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3329 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3330 address lowest = (address) dlinfo.dli_sname;
3331 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3332 if (begin < lowest) begin = lowest;
3333 Dl_info dlinfo2;
3334 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3335 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3336 end = (address) dlinfo2.dli_saddr;
3337 }
3338 Disassembler::decode(begin, end, st);
3339 }
3340 return true;
3341 }
3342 return false;
3343 }
3344
3345 ////////////////////////////////////////////////////////////////////////////////
3346 // misc
3347
3348 // This does not do anything on Bsd. This is basically a hook for being
3349 // able to use structured exception handling (thread-local exception filters)
3350 // on, e.g., Win32.
3351 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3352 const methodHandle& method, JavaCallArguments* args,
3353 Thread* thread) {
3354 f(value, method, args, thread);
3355 }
3356
3357 void os::print_statistics() {
3358 }
3359
3360 bool os::message_box(const char* title, const char* message) {
3361 int i;
3362 fdStream err(defaultStream::error_fd());
3363 for (i = 0; i < 78; i++) err.print_raw("=");
3364 err.cr();
3365 err.print_raw_cr(title);
3366 for (i = 0; i < 78; i++) err.print_raw("-");
3367 err.cr();
3368 err.print_raw_cr(message);
3369 for (i = 0; i < 78; i++) err.print_raw("=");
3370 err.cr();
3371
3372 char buf[16];
3373 // Prevent process from exiting upon "read error" without consuming all CPU
3374 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3375
3376 return buf[0] == 'y' || buf[0] == 'Y';
3377 }
3378
3379 static inline struct timespec get_mtime(const char* filename) {
3380 struct stat st;
3381 int ret = os::stat(filename, &st);
3382 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3383 #ifdef __APPLE__
3384 return st.st_mtimespec;
3385 #else
3386 return st.st_mtim;
3387 #endif
3388 }
3389
3390 int os::compare_file_modified_times(const char* file1, const char* file2) {
3391 struct timespec filetime1 = get_mtime(file1);
3392 struct timespec filetime2 = get_mtime(file2);
3393 int diff = filetime1.tv_sec - filetime2.tv_sec;
3394 if (diff == 0) {
3395 return filetime1.tv_nsec - filetime2.tv_nsec;
3396 }
3397 return diff;
3398 }
3399
3400 // Is a (classpath) directory empty?
3401 bool os::dir_is_empty(const char* path) {
3402 DIR *dir = NULL;
3403 struct dirent *ptr;
3404
3405 dir = opendir(path);
3406 if (dir == NULL) return true;
3407
3408 // Scan the directory
3409 bool result = true;
3410 while (result && (ptr = readdir(dir)) != NULL) {
3411 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3412 result = false;
3413 }
3414 }
3415 closedir(dir);
3416 return result;
3417 }
3418
3419 // This code originates from JDK's sysOpen and open64_w
3420 // from src/solaris/hpi/src/system_md.c
3421
3422 int os::open(const char *path, int oflag, int mode) {
3423 if (strlen(path) > MAX_PATH - 1) {
3424 errno = ENAMETOOLONG;
3425 return -1;
3426 }
3427 int fd;
3428
3429 fd = ::open(path, oflag, mode);
3430 if (fd == -1) return -1;
3431
3432 // If the open succeeded, the file might still be a directory
3433 {
3434 struct stat buf;
3435 int ret = ::fstat(fd, &buf);
3436 int st_mode = buf.st_mode;
3437
3438 if (ret != -1) {
3439 if ((st_mode & S_IFMT) == S_IFDIR) {
3440 errno = EISDIR;
3441 ::close(fd);
3442 return -1;
3443 }
3444 } else {
3445 ::close(fd);
3446 return -1;
3447 }
3448 }
3449
3450 // All file descriptors that are opened in the JVM and not
3451 // specifically destined for a subprocess should have the
3452 // close-on-exec flag set. If we don't set it, then careless 3rd
3453 // party native code might fork and exec without closing all
3454 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3455 // UNIXProcess.c), and this in turn might:
3456 //
3457 // - cause end-of-file to fail to be detected on some file
3458 // descriptors, resulting in mysterious hangs, or
3459 //
3460 // - might cause an fopen in the subprocess to fail on a system
3461 // suffering from bug 1085341.
3462 //
3463 // (Yes, the default setting of the close-on-exec flag is a Unix
3464 // design flaw)
3465 //
3466 // See:
3467 // 1085341: 32-bit stdio routines should support file descriptors >255
3468 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3469 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3470 //
3471 #ifdef FD_CLOEXEC
3472 {
3473 int flags = ::fcntl(fd, F_GETFD);
3474 if (flags != -1) {
3475 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3476 }
3477 }
3478 #endif
3479
3480 return fd;
3481 }
3482
3483
3484 // create binary file, rewriting existing file if required
3485 int os::create_binary_file(const char* path, bool rewrite_existing) {
3486 int oflags = O_WRONLY | O_CREAT;
3487 if (!rewrite_existing) {
3488 oflags |= O_EXCL;
3489 }
3490 return ::open(path, oflags, S_IREAD | S_IWRITE);
3491 }
3492
3493 // return current position of file pointer
3494 jlong os::current_file_offset(int fd) {
3495 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3496 }
3497
3498 // move file pointer to the specified offset
3499 jlong os::seek_to_file_offset(int fd, jlong offset) {
3500 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3501 }
3502
3503 // This code originates from JDK's sysAvailable
3504 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3505
3506 int os::available(int fd, jlong *bytes) {
3507 jlong cur, end;
3508 int mode;
3509 struct stat buf;
3510
3511 if (::fstat(fd, &buf) >= 0) {
3512 mode = buf.st_mode;
3513 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3514 int n;
3515 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3516 *bytes = n;
3517 return 1;
3518 }
3519 }
3520 }
3521 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3522 return 0;
3523 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3524 return 0;
3525 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3526 return 0;
3527 }
3528 *bytes = end - cur;
3529 return 1;
3530 }
3531
3532 // Map a block of memory.
3533 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3534 char *addr, size_t bytes, bool read_only,
3535 bool allow_exec) {
3536 int prot;
3537 int flags;
3538
3539 if (read_only) {
3540 prot = PROT_READ;
3541 flags = MAP_SHARED;
3542 } else {
3543 prot = PROT_READ | PROT_WRITE;
3544 flags = MAP_PRIVATE;
3545 }
3546
3547 if (allow_exec) {
3548 prot |= PROT_EXEC;
3549 }
3550
3551 if (addr != NULL) {
3552 flags |= MAP_FIXED;
3553 }
3554
3555 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3556 fd, file_offset);
3557 if (mapped_address == MAP_FAILED) {
3558 return NULL;
3559 }
3560 return mapped_address;
3561 }
3562
3563
3564 // Remap a block of memory.
3565 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3566 char *addr, size_t bytes, bool read_only,
3567 bool allow_exec) {
3568 // same as map_memory() on this OS
3569 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3570 allow_exec);
3571 }
3572
3573
3574 // Unmap a block of memory.
3575 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3576 return munmap(addr, bytes) == 0;
3577 }
3578
3579 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3580 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3581 // of a thread.
3582 //
3583 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3584 // the fast estimate available on the platform.
3585
3586 jlong os::current_thread_cpu_time() {
3587 #ifdef __APPLE__
3588 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3589 #else
3590 Unimplemented();
3591 return 0;
3592 #endif
3593 }
3594
3595 jlong os::thread_cpu_time(Thread* thread) {
3596 #ifdef __APPLE__
3597 return os::thread_cpu_time(thread, true /* user + sys */);
3598 #else
3599 Unimplemented();
3600 return 0;
3601 #endif
3602 }
3603
3604 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3605 #ifdef __APPLE__
3606 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3607 #else
3608 Unimplemented();
3609 return 0;
3610 #endif
3611 }
3612
3613 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3614 #ifdef __APPLE__
3615 struct thread_basic_info tinfo;
3616 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3617 kern_return_t kr;
3618 thread_t mach_thread;
3619
3620 mach_thread = thread->osthread()->thread_id();
3621 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3622 if (kr != KERN_SUCCESS) {
3623 return -1;
3624 }
3625
3626 if (user_sys_cpu_time) {
3627 jlong nanos;
3628 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3629 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3630 return nanos;
3631 } else {
3632 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3633 }
3634 #else
3635 Unimplemented();
3636 return 0;
3637 #endif
3638 }
3639
3640
3641 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3642 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3643 info_ptr->may_skip_backward = false; // elapsed time not wall time
3644 info_ptr->may_skip_forward = false; // elapsed time not wall time
3645 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3646 }
3647
3648 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3649 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3650 info_ptr->may_skip_backward = false; // elapsed time not wall time
3651 info_ptr->may_skip_forward = false; // elapsed time not wall time
3652 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3653 }
3654
3655 bool os::is_thread_cpu_time_supported() {
3656 #ifdef __APPLE__
3657 return true;
3658 #else
3659 return false;
3660 #endif
3661 }
3662
3663 // System loadavg support. Returns -1 if load average cannot be obtained.
3664 // Bsd doesn't yet have a (official) notion of processor sets,
3665 // so just return the system wide load average.
3666 int os::loadavg(double loadavg[], int nelem) {
3667 return ::getloadavg(loadavg, nelem);
3668 }
3669
3670 void os::pause() {
3671 char filename[MAX_PATH];
3672 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3673 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
3674 } else {
3675 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3676 }
3677
3678 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3679 if (fd != -1) {
3680 struct stat buf;
3681 ::close(fd);
3682 while (::stat(filename, &buf) == 0) {
3683 (void)::poll(NULL, 0, 100);
3684 }
3685 } else {
3686 jio_fprintf(stderr,
3687 "Could not open pause file '%s', continuing immediately.\n", filename);
3688 }
3689 }
3690
3691 // Darwin has no "environ" in a dynamic library.
3692 #ifdef __APPLE__
3693 #include <crt_externs.h>
3694 #define environ (*_NSGetEnviron())
3695 #else
3696 extern char** environ;
3697 #endif
3698
3699 // Run the specified command in a separate process. Return its exit value,
3700 // or -1 on failure (e.g. can't fork a new process).
3701 // Unlike system(), this function can be called from signal handler. It
3702 // doesn't block SIGINT et al.
3703 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3704 const char * argv[4] = {"sh", "-c", cmd, NULL};
3705
3706 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3707 // pthread_atfork handlers and reset pthread library. All we need is a
3708 // separate process to execve. Make a direct syscall to fork process.
3709 // On IA64 there's no fork syscall, we have to use fork() and hope for
3710 // the best...
3711 pid_t pid = fork();
3712
3713 if (pid < 0) {
3714 // fork failed
3715 return -1;
3716
3717 } else if (pid == 0) {
3718 // child process
3719
3720 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3721 // first to kill every thread on the thread list. Because this list is
3722 // not reset by fork() (see notes above), execve() will instead kill
3723 // every thread in the parent process. We know this is the only thread
3724 // in the new process, so make a system call directly.
3725 // IA64 should use normal execve() from glibc to match the glibc fork()
3726 // above.
3727 execve("/bin/sh", (char* const*)argv, environ);
3728
3729 // execve failed
3730 _exit(-1);
3731
3732 } else {
3733 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3734 // care about the actual exit code, for now.
3735
3736 int status;
3737
3738 // Wait for the child process to exit. This returns immediately if
3739 // the child has already exited. */
3740 while (waitpid(pid, &status, 0) < 0) {
3741 switch (errno) {
3742 case ECHILD: return 0;
3743 case EINTR: break;
3744 default: return -1;
3745 }
3746 }
3747
3748 if (WIFEXITED(status)) {
3749 // The child exited normally; get its exit code.
3750 return WEXITSTATUS(status);
3751 } else if (WIFSIGNALED(status)) {
3752 // The child exited because of a signal
3753 // The best value to return is 0x80 + signal number,
3754 // because that is what all Unix shells do, and because
3755 // it allows callers to distinguish between process exit and
3756 // process death by signal.
3757 return 0x80 + WTERMSIG(status);
3758 } else {
3759 // Unknown exit code; pass it through
3760 return status;
3761 }
3762 }
3763 }
3764
3765 // Get the kern.corefile setting, or otherwise the default path to the core file
3766 // Returns the length of the string
3767 int os::get_core_path(char* buffer, size_t bufferSize) {
3768 int n = 0;
3769 #ifdef __APPLE__
3770 char coreinfo[MAX_PATH];
3771 size_t sz = sizeof(coreinfo);
3772 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0);
3773 if (ret == 0) {
3774 char *pid_pos = strstr(coreinfo, "%P");
3775 // skip over the "%P" to preserve any optional custom user pattern
3776 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : "";
3777
3778 if (pid_pos != NULL) {
3779 *pid_pos = '\0';
3780 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail);
3781 } else {
3782 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo);
3783 }
3784 } else
3785 #endif
3786 {
3787 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
3788 }
3789 // Truncate if theoretical string was longer than bufferSize
3790 n = MIN2(n, (int)bufferSize);
3791
3792 return n;
3793 }
3794
3795 bool os::supports_map_sync() {
3796 return false;
3797 }
3798
3799 #ifndef PRODUCT
3800 void TestReserveMemorySpecial_test() {
3801 // No tests available for this platform
3802 }
3803 #endif
3804
3805 bool os::start_debugging(char *buf, int buflen) {
3806 int len = (int)strlen(buf);
3807 char *p = &buf[len];
3808
3809 jio_snprintf(p, buflen-len,
3810 "\n\n"
3811 "Do you want to debug the problem?\n\n"
3812 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3813 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3814 "Otherwise, press RETURN to abort...",
3815 os::current_process_id(), os::current_process_id(),
3816 os::current_thread_id(), os::current_thread_id());
3817
3818 bool yes = os::message_box("Unexpected Error", buf);
3819
3820 if (yes) {
3821 // yes, user asked VM to launch debugger
3822 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3823 os::current_process_id(), os::current_process_id());
3824
3825 os::fork_and_exec(buf);
3826 yes = false;
3827 }
3828 return yes;
3829 }