1 /*
2 * Copyright (c) 1999, 2014, 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 #include "utilities/globalDefinitions.hpp"
26 #include "prims/jvm.h"
27 #include "runtime/frame.inline.hpp"
28 #include "runtime/interfaceSupport.hpp"
29 #include "runtime/os.hpp"
30 #include "utilities/vmError.hpp"
31
32 #include <signal.h>
33 #include <unistd.h>
34 #include <sys/resource.h>
35 #include <sys/utsname.h>
36 #include <pthread.h>
37 #include <signal.h>
38
39 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
40
41 // Todo: provide a os::get_max_process_id() or similar. Number of processes
42 // may have been configured, can be read more accurately from proc fs etc.
43 #ifndef MAX_PID
44 #define MAX_PID INT_MAX
45 #endif
46 #define IS_VALID_PID(p) (p > 0 && p < MAX_PID)
47
48 int os::get_native_stack(address* stack, int frames, int toSkip) {
49 #ifdef _NMT_NOINLINE_
50 toSkip++;
51 #endif
52
53 int frame_idx = 0;
54 int num_of_frames; // number of frames captured
55 frame fr = os::current_frame();
56 while (fr.pc() && frame_idx < frames) {
57 if (toSkip > 0) {
58 toSkip --;
59 } else {
60 stack[frame_idx ++] = fr.pc();
61 }
62 if (fr.fp() == NULL || os::is_first_C_frame(&fr)
63 ||fr.sender_pc() == NULL || fr.cb() != NULL) break;
64
65 if (fr.sender_pc() && !os::is_first_C_frame(&fr)) {
66 fr = os::get_sender_for_C_frame(&fr);
67 } else {
68 break;
69 }
70 }
71 num_of_frames = frame_idx;
72 for (; frame_idx < frames; frame_idx ++) {
73 stack[frame_idx] = NULL;
74 }
75
76 return num_of_frames;
77 }
78
79
80 bool os::unsetenv(const char* name) {
81 assert(name != NULL, "Null pointer");
82 return (::unsetenv(name) == 0);
83 }
84
85 int os::get_last_error() {
86 return errno;
87 }
88
89 bool os::is_debugger_attached() {
90 // not implemented
91 return false;
92 }
93
94 void os::wait_for_keypress_at_exit(void) {
95 // don't do anything on posix platforms
96 return;
97 }
98
99 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED,
100 // so on posix, unmap the section at the start and at the end of the chunk that we mapped
101 // rather than unmapping and remapping the whole chunk to get requested alignment.
102 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
103 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
104 "Alignment must be a multiple of allocation granularity (page size)");
105 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
106
107 size_t extra_size = size + alignment;
108 assert(extra_size >= size, "overflow, size is too large to allow alignment");
109
110 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
111
112 if (extra_base == NULL) {
113 return NULL;
114 }
115
116 // Do manual alignment
117 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
118
119 // [ | | ]
120 // ^ extra_base
121 // ^ extra_base + begin_offset == aligned_base
122 // extra_base + begin_offset + size ^
123 // extra_base + extra_size ^
124 // |<>| == begin_offset
125 // end_offset == |<>|
126 size_t begin_offset = aligned_base - extra_base;
127 size_t end_offset = (extra_base + extra_size) - (aligned_base + size);
128
129 if (begin_offset > 0) {
130 os::release_memory(extra_base, begin_offset);
131 }
132
133 if (end_offset > 0) {
134 os::release_memory(extra_base + begin_offset + size, end_offset);
135 }
136
137 return aligned_base;
138 }
139
140 void os::Posix::print_load_average(outputStream* st) {
141 st->print("load average:");
142 double loadavg[3];
143 os::loadavg(loadavg, 3);
144 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
145 st->cr();
146 }
147
148 void os::Posix::print_rlimit_info(outputStream* st) {
149 st->print("rlimit:");
150 struct rlimit rlim;
151
152 st->print(" STACK ");
153 getrlimit(RLIMIT_STACK, &rlim);
154 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
155 else st->print("%uk", rlim.rlim_cur >> 10);
156
157 st->print(", CORE ");
158 getrlimit(RLIMIT_CORE, &rlim);
159 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
160 else st->print("%uk", rlim.rlim_cur >> 10);
161
162 // Isn't there on solaris
163 #if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix)
164 st->print(", NPROC ");
165 getrlimit(RLIMIT_NPROC, &rlim);
166 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
167 else st->print("%d", rlim.rlim_cur);
168 #endif
169
170 st->print(", NOFILE ");
171 getrlimit(RLIMIT_NOFILE, &rlim);
172 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
173 else st->print("%d", rlim.rlim_cur);
174
175 st->print(", AS ");
176 getrlimit(RLIMIT_AS, &rlim);
177 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
178 else st->print("%uk", rlim.rlim_cur >> 10);
179 st->cr();
180 }
181
182 void os::Posix::print_uname_info(outputStream* st) {
183 // kernel
184 st->print("uname:");
185 struct utsname name;
186 uname(&name);
187 st->print("%s ", name.sysname);
188 #ifdef ASSERT
189 st->print("%s ", name.nodename);
190 #endif
191 st->print("%s ", name.release);
192 st->print("%s ", name.version);
193 st->print("%s", name.machine);
194 st->cr();
195 }
196
197 bool os::has_allocatable_memory_limit(julong* limit) {
198 struct rlimit rlim;
199 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim);
200 // if there was an error when calling getrlimit, assume that there is no limitation
201 // on virtual memory.
202 bool result;
203 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) {
204 result = false;
205 } else {
206 *limit = (julong)rlim.rlim_cur;
207 result = true;
208 }
209 #ifdef _LP64
210 return result;
211 #else
212 // arbitrary virtual space limit for 32 bit Unices found by testing. If
213 // getrlimit above returned a limit, bound it with this limit. Otherwise
214 // directly use it.
215 const julong max_virtual_limit = (julong)3800*M;
216 if (result) {
217 *limit = MIN2(*limit, max_virtual_limit);
218 } else {
219 *limit = max_virtual_limit;
220 }
221
222 // bound by actually allocatable memory. The algorithm uses two bounds, an
223 // upper and a lower limit. The upper limit is the current highest amount of
224 // memory that could not be allocated, the lower limit is the current highest
225 // amount of memory that could be allocated.
226 // The algorithm iteratively refines the result by halving the difference
227 // between these limits, updating either the upper limit (if that value could
228 // not be allocated) or the lower limit (if the that value could be allocated)
229 // until the difference between these limits is "small".
230
231 // the minimum amount of memory we care about allocating.
232 const julong min_allocation_size = M;
233
234 julong upper_limit = *limit;
235
236 // first check a few trivial cases
237 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) {
238 *limit = upper_limit;
239 } else if (!is_allocatable(min_allocation_size)) {
240 // we found that not even min_allocation_size is allocatable. Return it
241 // anyway. There is no point to search for a better value any more.
242 *limit = min_allocation_size;
243 } else {
244 // perform the binary search.
245 julong lower_limit = min_allocation_size;
246 while ((upper_limit - lower_limit) > min_allocation_size) {
247 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit;
248 temp_limit = align_size_down_(temp_limit, min_allocation_size);
249 if (is_allocatable(temp_limit)) {
250 lower_limit = temp_limit;
251 } else {
252 upper_limit = temp_limit;
253 }
254 }
255 *limit = lower_limit;
256 }
257 return true;
258 #endif
259 }
260
261 const char* os::get_current_directory(char *buf, size_t buflen) {
262 return getcwd(buf, buflen);
263 }
264
265 FILE* os::open(int fd, const char* mode) {
266 return ::fdopen(fd, mode);
267 }
268
269 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
270 // which is used to find statically linked in agents.
271 // Parameters:
272 // sym_name: Symbol in library we are looking for
273 // lib_name: Name of library to look in, NULL for shared libs.
274 // is_absolute_path == true if lib_name is absolute path to agent
275 // such as "/a/b/libL.so"
276 // == false if only the base name of the library is passed in
277 // such as "L"
278 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
279 bool is_absolute_path) {
280 char *agent_entry_name;
281 size_t len;
282 size_t name_len;
283 size_t prefix_len = strlen(JNI_LIB_PREFIX);
284 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
285 const char *start;
286
287 if (lib_name != NULL) {
288 len = name_len = strlen(lib_name);
289 if (is_absolute_path) {
290 // Need to strip path, prefix and suffix
291 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
292 lib_name = ++start;
293 }
294 if (len <= (prefix_len + suffix_len)) {
295 return NULL;
296 }
297 lib_name += prefix_len;
298 name_len = strlen(lib_name) - suffix_len;
299 }
300 }
301 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
302 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
303 if (agent_entry_name == NULL) {
304 return NULL;
305 }
306 strcpy(agent_entry_name, sym_name);
307 if (lib_name != NULL) {
308 strcat(agent_entry_name, "_");
309 strncat(agent_entry_name, lib_name, name_len);
310 }
311 return agent_entry_name;
312 }
313
314 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
315 assert(thread == Thread::current(), "thread consistency check");
316
317 ParkEvent * const slp = thread->_SleepEvent ;
318 slp->reset() ;
319 OrderAccess::fence() ;
320
321 if (interruptible) {
322 jlong prevtime = javaTimeNanos();
323
324 for (;;) {
325 if (os::is_interrupted(thread, true)) {
326 return OS_INTRPT;
327 }
328
329 jlong newtime = javaTimeNanos();
330
331 if (newtime - prevtime < 0) {
332 // time moving backwards, should only happen if no monotonic clock
333 // not a guarantee() because JVM should not abort on kernel/glibc bugs
334 assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected in os::sleep(interruptible)");
335 } else {
336 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
337 }
338
339 if (millis <= 0) {
340 return OS_OK;
341 }
342
343 prevtime = newtime;
344
345 {
346 assert(thread->is_Java_thread(), "sanity check");
347 JavaThread *jt = (JavaThread *) thread;
348 ThreadBlockInVM tbivm(jt);
349 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
350
351 jt->set_suspend_equivalent();
352 // cleared by handle_special_suspend_equivalent_condition() or
353 // java_suspend_self() via check_and_wait_while_suspended()
354
355 slp->park(millis);
356
357 // were we externally suspended while we were waiting?
358 jt->check_and_wait_while_suspended();
359 }
360 }
361 } else {
362 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
363 jlong prevtime = javaTimeNanos();
364
365 for (;;) {
366 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
367 // the 1st iteration ...
368 jlong newtime = javaTimeNanos();
369
370 if (newtime - prevtime < 0) {
371 // time moving backwards, should only happen if no monotonic clock
372 // not a guarantee() because JVM should not abort on kernel/glibc bugs
373 assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected on os::sleep(!interruptible)");
374 } else {
375 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
376 }
377
378 if (millis <= 0) break ;
379
380 prevtime = newtime;
381 slp->park(millis);
382 }
383 return OS_OK ;
384 }
385 }
386
387 ////////////////////////////////////////////////////////////////////////////////
388 // interrupt support
389
390 void os::interrupt(Thread* thread) {
391 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
392 "possibility of dangling Thread pointer");
393
394 OSThread* osthread = thread->osthread();
395
396 if (!osthread->interrupted()) {
397 osthread->set_interrupted(true);
398 // More than one thread can get here with the same value of osthread,
399 // resulting in multiple notifications. We do, however, want the store
400 // to interrupted() to be visible to other threads before we execute unpark().
401 OrderAccess::fence();
402 ParkEvent * const slp = thread->_SleepEvent ;
403 if (slp != NULL) slp->unpark() ;
404 }
405
406 // For JSR166. Unpark even if interrupt status already was set
407 if (thread->is_Java_thread())
408 ((JavaThread*)thread)->parker()->unpark();
409
410 ParkEvent * ev = thread->_ParkEvent ;
411 if (ev != NULL) ev->unpark() ;
412
413 }
414
415 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
416 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
417 "possibility of dangling Thread pointer");
418
419 OSThread* osthread = thread->osthread();
420
421 bool interrupted = osthread->interrupted();
422
423 // NOTE that since there is no "lock" around the interrupt and
424 // is_interrupted operations, there is the possibility that the
425 // interrupted flag (in osThread) will be "false" but that the
426 // low-level events will be in the signaled state. This is
427 // intentional. The effect of this is that Object.wait() and
428 // LockSupport.park() will appear to have a spurious wakeup, which
429 // is allowed and not harmful, and the possibility is so rare that
430 // it is not worth the added complexity to add yet another lock.
431 // For the sleep event an explicit reset is performed on entry
432 // to os::sleep, so there is no early return. It has also been
433 // recommended not to put the interrupted flag into the "event"
434 // structure because it hides the issue.
435 if (interrupted && clear_interrupted) {
436 osthread->set_interrupted(false);
437 // consider thread->_SleepEvent->reset() ... optional optimization
438 }
439
440 return interrupted;
441 }
442
443 // Returned string is a constant. For unknown signals "UNKNOWN" is returned.
444 const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) {
445
446 static const struct {
447 int sig; const char* name;
448 }
449 info[] =
450 {
451 { SIGABRT, "SIGABRT" },
452 #ifdef SIGAIO
453 { SIGAIO, "SIGAIO" },
454 #endif
455 { SIGALRM, "SIGALRM" },
456 #ifdef SIGALRM1
457 { SIGALRM1, "SIGALRM1" },
458 #endif
459 { SIGBUS, "SIGBUS" },
460 #ifdef SIGCANCEL
461 { SIGCANCEL, "SIGCANCEL" },
462 #endif
463 { SIGCHLD, "SIGCHLD" },
464 #ifdef SIGCLD
465 { SIGCLD, "SIGCLD" },
466 #endif
467 { SIGCONT, "SIGCONT" },
468 #ifdef SIGCPUFAIL
469 { SIGCPUFAIL, "SIGCPUFAIL" },
470 #endif
471 #ifdef SIGDANGER
472 { SIGDANGER, "SIGDANGER" },
473 #endif
474 #ifdef SIGDIL
475 { SIGDIL, "SIGDIL" },
476 #endif
477 #ifdef SIGEMT
478 { SIGEMT, "SIGEMT" },
479 #endif
480 { SIGFPE, "SIGFPE" },
481 #ifdef SIGFREEZE
482 { SIGFREEZE, "SIGFREEZE" },
483 #endif
484 #ifdef SIGGFAULT
485 { SIGGFAULT, "SIGGFAULT" },
486 #endif
487 #ifdef SIGGRANT
488 { SIGGRANT, "SIGGRANT" },
489 #endif
490 { SIGHUP, "SIGHUP" },
491 { SIGILL, "SIGILL" },
492 { SIGINT, "SIGINT" },
493 #ifdef SIGIO
494 { SIGIO, "SIGIO" },
495 #endif
496 #ifdef SIGIOINT
497 { SIGIOINT, "SIGIOINT" },
498 #endif
499 #ifdef SIGIOT
500 // SIGIOT is there for BSD compatibility, but on most Unices just a
501 // synonym for SIGABRT. The result should be "SIGABRT", not
502 // "SIGIOT".
503 #if (SIGIOT != SIGABRT )
504 { SIGIOT, "SIGIOT" },
505 #endif
506 #endif
507 #ifdef SIGKAP
508 { SIGKAP, "SIGKAP" },
509 #endif
510 { SIGKILL, "SIGKILL" },
511 #ifdef SIGLOST
512 { SIGLOST, "SIGLOST" },
513 #endif
514 #ifdef SIGLWP
515 { SIGLWP, "SIGLWP" },
516 #endif
517 #ifdef SIGLWPTIMER
518 { SIGLWPTIMER, "SIGLWPTIMER" },
519 #endif
520 #ifdef SIGMIGRATE
521 { SIGMIGRATE, "SIGMIGRATE" },
522 #endif
523 #ifdef SIGMSG
524 { SIGMSG, "SIGMSG" },
525 #endif
526 { SIGPIPE, "SIGPIPE" },
527 #ifdef SIGPOLL
528 { SIGPOLL, "SIGPOLL" },
529 #endif
530 #ifdef SIGPRE
531 { SIGPRE, "SIGPRE" },
532 #endif
533 { SIGPROF, "SIGPROF" },
534 #ifdef SIGPTY
535 { SIGPTY, "SIGPTY" },
536 #endif
537 #ifdef SIGPWR
538 { SIGPWR, "SIGPWR" },
539 #endif
540 { SIGQUIT, "SIGQUIT" },
541 #ifdef SIGRECONFIG
542 { SIGRECONFIG, "SIGRECONFIG" },
543 #endif
544 #ifdef SIGRECOVERY
545 { SIGRECOVERY, "SIGRECOVERY" },
546 #endif
547 #ifdef SIGRESERVE
548 { SIGRESERVE, "SIGRESERVE" },
549 #endif
550 #ifdef SIGRETRACT
551 { SIGRETRACT, "SIGRETRACT" },
552 #endif
553 #ifdef SIGSAK
554 { SIGSAK, "SIGSAK" },
555 #endif
556 { SIGSEGV, "SIGSEGV" },
557 #ifdef SIGSOUND
558 { SIGSOUND, "SIGSOUND" },
559 #endif
560 { SIGSTOP, "SIGSTOP" },
561 { SIGSYS, "SIGSYS" },
562 #ifdef SIGSYSERROR
563 { SIGSYSERROR, "SIGSYSERROR" },
564 #endif
565 #ifdef SIGTALRM
566 { SIGTALRM, "SIGTALRM" },
567 #endif
568 { SIGTERM, "SIGTERM" },
569 #ifdef SIGTHAW
570 { SIGTHAW, "SIGTHAW" },
571 #endif
572 { SIGTRAP, "SIGTRAP" },
573 #ifdef SIGTSTP
574 { SIGTSTP, "SIGTSTP" },
575 #endif
576 { SIGTTIN, "SIGTTIN" },
577 { SIGTTOU, "SIGTTOU" },
578 #ifdef SIGURG
579 { SIGURG, "SIGURG" },
580 #endif
581 { SIGUSR1, "SIGUSR1" },
582 { SIGUSR2, "SIGUSR2" },
583 #ifdef SIGVIRT
584 { SIGVIRT, "SIGVIRT" },
585 #endif
586 { SIGVTALRM, "SIGVTALRM" },
587 #ifdef SIGWAITING
588 { SIGWAITING, "SIGWAITING" },
589 #endif
590 #ifdef SIGWINCH
591 { SIGWINCH, "SIGWINCH" },
592 #endif
593 #ifdef SIGWINDOW
594 { SIGWINDOW, "SIGWINDOW" },
595 #endif
596 { SIGXCPU, "SIGXCPU" },
597 { SIGXFSZ, "SIGXFSZ" },
598 #ifdef SIGXRES
599 { SIGXRES, "SIGXRES" },
600 #endif
601 { -1, NULL }
602 };
603
604 const char* ret = NULL;
605
606 #ifdef SIGRTMIN
607 if (sig >= SIGRTMIN && sig <= SIGRTMAX) {
608 if (sig == SIGRTMIN) {
609 ret = "SIGRTMIN";
610 } else if (sig == SIGRTMAX) {
611 ret = "SIGRTMAX";
612 } else {
613 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN);
614 return out;
615 }
616 }
617 #endif
618
619 if (sig > 0) {
620 for (int idx = 0; info[idx].sig != -1; idx ++) {
621 if (info[idx].sig == sig) {
622 ret = info[idx].name;
623 break;
624 }
625 }
626 }
627
628 if (!ret) {
629 if (!is_valid_signal(sig)) {
630 ret = "INVALID";
631 } else {
632 ret = "UNKNOWN";
633 }
634 }
635
636 jio_snprintf(out, outlen, ret);
637 return out;
638 }
639
640 // Returns true if signal number is valid.
641 bool os::Posix::is_valid_signal(int sig) {
642 // MacOS not really POSIX compliant: sigaddset does not return
643 // an error for invalid signal numbers. However, MacOS does not
644 // support real time signals and simply seems to have just 33
645 // signals with no holes in the signal range.
646 #ifdef __APPLE__
647 return sig >= 1 && sig < NSIG;
648 #else
649 // Use sigaddset to check for signal validity.
650 sigset_t set;
651 if (sigaddset(&set, sig) == -1 && errno == EINVAL) {
652 return false;
653 }
654 return true;
655 #endif
656 }
657
658 #define NUM_IMPORTANT_SIGS 32
659 // Returns one-line short description of a signal set in a user provided buffer.
660 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) {
661 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size");
662 // Note: for shortness, just print out the first 32. That should
663 // cover most of the useful ones, apart from realtime signals.
664 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) {
665 const int rc = sigismember(set, sig);
666 if (rc == -1 && errno == EINVAL) {
667 buffer[sig-1] = '?';
668 } else {
669 buffer[sig-1] = rc == 0 ? '0' : '1';
670 }
671 }
672 buffer[NUM_IMPORTANT_SIGS] = 0;
673 return buffer;
674 }
675
676 // Prints one-line description of a signal set.
677 void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) {
678 char buf[NUM_IMPORTANT_SIGS + 1];
679 os::Posix::describe_signal_set_short(set, buf, sizeof(buf));
680 st->print("%s", buf);
681 }
682
683 // Writes one-line description of a combination of sigaction.sa_flags into a user
684 // provided buffer. Returns that buffer.
685 const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) {
686 char* p = buffer;
687 size_t remaining = size;
688 bool first = true;
689 int idx = 0;
690
691 assert(buffer, "invalid argument");
692
693 if (size == 0) {
694 return buffer;
695 }
696
697 strncpy(buffer, "none", size);
698
699 const struct {
700 int i;
701 const char* s;
702 } flaginfo [] = {
703 { SA_NOCLDSTOP, "SA_NOCLDSTOP" },
704 { SA_ONSTACK, "SA_ONSTACK" },
705 { SA_RESETHAND, "SA_RESETHAND" },
706 { SA_RESTART, "SA_RESTART" },
707 { SA_SIGINFO, "SA_SIGINFO" },
708 { SA_NOCLDWAIT, "SA_NOCLDWAIT" },
709 { SA_NODEFER, "SA_NODEFER" },
710 #ifdef AIX
711 { SA_ONSTACK, "SA_ONSTACK" },
712 { SA_OLDSTYLE, "SA_OLDSTYLE" },
713 #endif
714 { 0, NULL }
715 };
716
717 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) {
718 if (flags & flaginfo[idx].i) {
719 if (first) {
720 jio_snprintf(p, remaining, "%s", flaginfo[idx].s);
721 first = false;
722 } else {
723 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s);
724 }
725 const size_t len = strlen(p);
726 p += len;
727 remaining -= len;
728 }
729 }
730
731 buffer[size - 1] = '\0';
732
733 return buffer;
734 }
735
736 // Prints one-line description of a combination of sigaction.sa_flags.
737 void os::Posix::print_sa_flags(outputStream* st, int flags) {
738 char buffer[0x100];
739 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer));
740 st->print("%s", buffer);
741 }
742
743 // Helper function for os::Posix::print_siginfo_...():
744 // return a textual description for signal code.
745 struct enum_sigcode_desc_t {
746 const char* s_name;
747 const char* s_desc;
748 };
749
750 static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) {
751
752 const struct {
753 int sig; int code; const char* s_code; const char* s_desc;
754 } t1 [] = {
755 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." },
756 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." },
757 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." },
758 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." },
759 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." },
760 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." },
761 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." },
762 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." },
763 #if defined(IA64) && defined(LINUX)
764 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" },
765 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" },
766 #endif
767 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." },
768 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." },
769 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." },
770 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." },
771 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." },
772 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." },
773 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." },
774 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." },
775 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." },
776 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." },
777 #ifdef AIX
778 // no explanation found what keyerr would be
779 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" },
780 #endif
781 #if defined(IA64) && !defined(AIX)
782 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" },
783 #endif
784 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." },
785 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." },
786 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." },
787 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." },
788 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." },
789 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." },
790 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." },
791 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." },
792 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." },
793 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." },
794 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." },
795 #ifdef SIGPOLL
796 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." },
797 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." },
798 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." },
799 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." },
800 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" },
801 #endif
802 { -1, -1, NULL, NULL }
803 };
804
805 // Codes valid in any signal context.
806 const struct {
807 int code; const char* s_code; const char* s_desc;
808 } t2 [] = {
809 { SI_USER, "SI_USER", "Signal sent by kill()." },
810 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." },
811 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." },
812 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." },
813 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." },
814 // Linux specific
815 #ifdef SI_TKILL
816 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" },
817 #endif
818 #ifdef SI_DETHREAD
819 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" },
820 #endif
821 #ifdef SI_KERNEL
822 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." },
823 #endif
824 #ifdef SI_SIGIO
825 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" },
826 #endif
827
828 #ifdef AIX
829 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" },
830 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" },
831 #endif
832
833 #ifdef __sun
834 { SI_NOINFO, "SI_NOINFO", "No signal information" },
835 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" },
836 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" },
837 #endif
838
839 { -1, NULL, NULL }
840 };
841
842 const char* s_code = NULL;
843 const char* s_desc = NULL;
844
845 for (int i = 0; t1[i].sig != -1; i ++) {
846 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) {
847 s_code = t1[i].s_code;
848 s_desc = t1[i].s_desc;
849 break;
850 }
851 }
852
853 if (s_code == NULL) {
854 for (int i = 0; t2[i].s_code != NULL; i ++) {
855 if (t2[i].code == si->si_code) {
856 s_code = t2[i].s_code;
857 s_desc = t2[i].s_desc;
858 }
859 }
860 }
861
862 if (s_code == NULL) {
863 out->s_name = "unknown";
864 out->s_desc = "unknown";
865 return false;
866 }
867
868 out->s_name = s_code;
869 out->s_desc = s_desc;
870
871 return true;
872 }
873
874 // A POSIX conform, platform-independend siginfo print routine.
875 // Short print out on one line.
876 void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) {
877 char buf[20];
878 os->print("siginfo: ");
879
880 if (!si) {
881 os->print("<null>");
882 return;
883 }
884
885 // See print_siginfo_full() for details.
886 const int sig = si->si_signo;
887
888 os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf)));
889
890 enum_sigcode_desc_t ed;
891 if (get_signal_code_description(si, &ed)) {
892 os->print(", si_code: %d (%s)", si->si_code, ed.s_name);
893 } else {
894 os->print(", si_code: %d (unknown)", si->si_code);
895 }
896
897 if (si->si_errno) {
898 os->print(", si_errno: %d", si->si_errno);
899 }
900
901 const int me = (int) ::getpid();
902 const int pid = (int) si->si_pid;
903
904 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) {
905 if (IS_VALID_PID(pid) && pid != me) {
906 os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid);
907 }
908 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
909 sig == SIGTRAP || sig == SIGFPE) {
910 os->print(", si_addr: " PTR_FORMAT, si->si_addr);
911 #ifdef SIGPOLL
912 } else if (sig == SIGPOLL) {
913 os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band);
914 #endif
915 } else if (sig == SIGCHLD) {
916 os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status);
917 }
918 }
919
920 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
921 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
922 }
923
924 /*
925 * See the caveats for this class in os_posix.hpp
926 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this
927 * method and returns false. If none of the signals are raised, returns true.
928 * The callback is supposed to provide the method that should be protected.
929 */
930 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
931 sigset_t saved_sig_mask;
932
933 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
934 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
935 "crash_protection already set?");
936
937 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask
938 // since on at least some systems (OS X) siglongjmp will restore the mask
939 // for the process, not the thread
940 pthread_sigmask(0, NULL, &saved_sig_mask);
941 if (sigsetjmp(_jmpbuf, 0) == 0) {
942 // make sure we can see in the signal handler that we have crash protection
943 // installed
944 WatcherThread::watcher_thread()->set_crash_protection(this);
945 cb.call();
946 // and clear the crash protection
947 WatcherThread::watcher_thread()->set_crash_protection(NULL);
948 return true;
949 }
950 // this happens when we siglongjmp() back
951 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL);
952 WatcherThread::watcher_thread()->set_crash_protection(NULL);
953 return false;
954 }
955
956 void os::WatcherThreadCrashProtection::restore() {
957 assert(WatcherThread::watcher_thread()->has_crash_protection(),
958 "must have crash protection");
959
960 siglongjmp(_jmpbuf, 1);
961 }
962
963 void os::WatcherThreadCrashProtection::check_crash_protection(int sig,
964 Thread* thread) {
965
966 if (thread != NULL &&
967 thread->is_Watcher_thread() &&
968 WatcherThread::watcher_thread()->has_crash_protection()) {
969
970 if (sig == SIGSEGV || sig == SIGBUS) {
971 WatcherThread::watcher_thread()->crash_protection()->restore();
972 }
973 }
974 }