3 * POSIX signal handling support for Mono.
6 * Mono Team (mono-list@lists.ximian.com)
8 * Copyright 2001-2003 Ximian, Inc.
9 * Copyright 2003-2008 Ximian, Inc.
10 * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
12 * See LICENSE for licensing information.
13 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
24 #ifdef HAVE_SYS_TIME_H
27 #ifdef HAVE_SYS_SYSCALL_H
28 #include <sys/syscall.h>
33 #include <mono/metadata/assembly.h>
34 #include <mono/metadata/loader.h>
35 #include <mono/metadata/tabledefs.h>
36 #include <mono/metadata/class.h>
37 #include <mono/metadata/object.h>
38 #include <mono/metadata/tokentype.h>
39 #include <mono/metadata/tabledefs.h>
40 #include <mono/metadata/threads.h>
41 #include <mono/metadata/appdomain.h>
42 #include <mono/metadata/debug-helpers.h>
43 #include "mono/metadata/profiler.h"
44 #include <mono/metadata/profiler-private.h>
45 #include <mono/metadata/mono-config.h>
46 #include <mono/metadata/environment.h>
47 #include <mono/metadata/mono-debug.h>
48 #include <mono/metadata/gc-internals.h>
49 #include <mono/metadata/threads-types.h>
50 #include <mono/metadata/verify.h>
51 #include <mono/metadata/verify-internals.h>
52 #include <mono/metadata/mempool-internals.h>
53 #include <mono/metadata/attach.h>
54 #include <mono/utils/mono-math.h>
55 #include <mono/utils/mono-compiler.h>
56 #include <mono/utils/mono-counters.h>
57 #include <mono/utils/mono-logger-internals.h>
58 #include <mono/utils/mono-mmap.h>
59 #include <mono/utils/dtrace.h>
60 #include <mono/utils/mono-signal-handler.h>
61 #include <mono/utils/mono-threads.h>
68 #include "debugger-agent.h"
70 #include "jit-icalls.h"
72 #ifdef PLATFORM_MACOSX
73 #include <mach/mach.h>
74 #include <mach/mach_time.h>
75 #include <mach/clock.h>
78 #if defined(HOST_WATCHOS)
81 mono_runtime_setup_stat_profiler (void)
83 printf("WARNING: mono_runtime_setup_stat_profiler() called!\n");
88 mono_runtime_shutdown_stat_profiler (void)
94 MONO_SIG_HANDLER_SIGNATURE (mono_chain_signal)
99 #ifndef PLATFORM_MACOSX
101 mono_runtime_install_handlers (void)
107 mono_runtime_posix_install_handlers(void)
109 /* we still need to ignore SIGPIPE */
110 signal (SIGPIPE, SIG_IGN);
114 mono_runtime_shutdown_handlers (void)
119 mono_runtime_cleanup_handlers (void)
125 static GHashTable *mono_saved_signal_handlers = NULL;
127 static struct sigaction *
128 get_saved_signal_handler (int signo, gboolean remove)
130 if (mono_saved_signal_handlers) {
131 /* The hash is only modified during startup, so no need for locking */
132 struct sigaction *handler = g_hash_table_lookup (mono_saved_signal_handlers, GINT_TO_POINTER (signo));
133 if (remove && handler)
134 g_hash_table_remove (mono_saved_signal_handlers, GINT_TO_POINTER (signo));
141 save_old_signal_handler (int signo, struct sigaction *old_action)
143 struct sigaction *handler_to_save = (struct sigaction *)g_malloc (sizeof (struct sigaction));
145 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_CONFIG,
146 "Saving old signal handler for signal %d.", signo);
148 if (! (old_action->sa_flags & SA_SIGINFO)) {
149 handler_to_save->sa_handler = old_action->sa_handler;
151 #ifdef MONO_ARCH_USE_SIGACTION
152 handler_to_save->sa_sigaction = old_action->sa_sigaction;
153 #endif /* MONO_ARCH_USE_SIGACTION */
155 handler_to_save->sa_mask = old_action->sa_mask;
156 handler_to_save->sa_flags = old_action->sa_flags;
158 if (!mono_saved_signal_handlers)
159 mono_saved_signal_handlers = g_hash_table_new_full (NULL, NULL, NULL, g_free);
160 g_hash_table_insert (mono_saved_signal_handlers, GINT_TO_POINTER (signo), handler_to_save);
164 free_saved_signal_handlers (void)
166 if (mono_saved_signal_handlers) {
167 g_hash_table_destroy (mono_saved_signal_handlers);
168 mono_saved_signal_handlers = NULL;
175 * Call the original signal handler for the signal given by the arguments, which
176 * should be the same as for a signal handler. Returns TRUE if the original handler
177 * was called, false otherwise.
180 MONO_SIG_HANDLER_SIGNATURE (mono_chain_signal)
182 int signal = MONO_SIG_HANDLER_GET_SIGNO ();
183 struct sigaction *saved_handler = (struct sigaction *)get_saved_signal_handler (signal, FALSE);
185 if (saved_handler && saved_handler->sa_handler) {
186 if (!(saved_handler->sa_flags & SA_SIGINFO)) {
187 saved_handler->sa_handler (signal);
189 #ifdef MONO_ARCH_USE_SIGACTION
190 saved_handler->sa_sigaction (MONO_SIG_HANDLER_PARAMS);
191 #endif /* MONO_ARCH_USE_SIGACTION */
198 MONO_SIG_HANDLER_FUNC (static, sigabrt_signal_handler)
200 MonoJitInfo *ji = NULL;
201 MONO_SIG_HANDLER_INFO_TYPE *info = MONO_SIG_HANDLER_GET_INFO ();
202 MONO_SIG_HANDLER_GET_CONTEXT;
204 if (mono_thread_internal_current ())
205 ji = mono_jit_info_table_find_internal (mono_domain_get (), (char *)mono_arch_ip_from_context (ctx), TRUE, TRUE);
207 if (mono_chain_signal (MONO_SIG_HANDLER_PARAMS))
209 mono_handle_native_crash ("SIGABRT", ctx, info);
213 #if (defined (USE_POSIX_BACKEND) && defined (SIGRTMIN)) || defined (SIGPROF)
214 #define HAVE_PROFILER_SIGNAL
217 #ifdef HAVE_PROFILER_SIGNAL
219 static MonoNativeThreadId sampling_thread;
221 static gint32 profiler_signals_sent;
222 static gint32 profiler_signals_received;
223 static gint32 profiler_signals_accepted;
224 static gint32 profiler_interrupt_signals_received;
226 MONO_SIG_HANDLER_FUNC (static, profiler_signal_handler)
228 int old_errno = errno;
230 MONO_SIG_HANDLER_GET_CONTEXT;
232 /* See the comment in mono_runtime_shutdown_stat_profiler (). */
233 if (mono_native_thread_id_get () == sampling_thread) {
234 InterlockedIncrement (&profiler_interrupt_signals_received);
238 InterlockedIncrement (&profiler_signals_received);
240 // Did a non-attached or detaching thread get the signal?
241 if (mono_thread_info_get_small_id () == -1 ||
242 !mono_domain_get () ||
243 !mono_tls_get_jit_tls ()) {
248 // See the comment in sampling_thread_func ().
249 InterlockedWrite (&mono_thread_info_current ()->profiler_signal_ack, 1);
251 InterlockedIncrement (&profiler_signals_accepted);
253 int hp_save_index = mono_hazard_pointer_save_for_signal_handler ();
255 mono_thread_info_set_is_async_context (TRUE);
257 MONO_PROFILER_RAISE (sample_hit, (mono_arch_ip_from_context (ctx), ctx));
259 mono_thread_info_set_is_async_context (FALSE);
261 mono_hazard_pointer_restore_for_signal_handler (hp_save_index);
265 mono_chain_signal (MONO_SIG_HANDLER_PARAMS);
270 MONO_SIG_HANDLER_FUNC (static, sigquit_signal_handler)
274 /* We use this signal to start the attach agent too */
275 res = mono_attach_start ();
279 mono_threads_request_thread_dump ();
281 mono_chain_signal (MONO_SIG_HANDLER_PARAMS);
284 MONO_SIG_HANDLER_FUNC (static, sigusr2_signal_handler)
286 gboolean enabled = mono_trace_is_enabled ();
288 mono_trace_enable (!enabled);
290 mono_chain_signal (MONO_SIG_HANDLER_PARAMS);
294 add_signal_handler (int signo, gpointer handler, int flags)
297 struct sigaction previous_sa;
299 #ifdef MONO_ARCH_USE_SIGACTION
300 sa.sa_sigaction = (void (*)(int, siginfo_t *, void *))handler;
301 sigemptyset (&sa.sa_mask);
302 sa.sa_flags = SA_SIGINFO | flags;
303 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
305 /*Apple likes to deliver SIGBUS for *0 */
306 #ifdef PLATFORM_MACOSX
307 if (signo == SIGSEGV || signo == SIGBUS) {
309 if (signo == SIGSEGV) {
311 sa.sa_flags |= SA_ONSTACK;
314 * libgc will crash when trying to do stack marking for threads which are on
315 * an altstack, so delay the suspend signal after the signal handler has
318 if (mono_gc_get_suspend_signal () != -1)
319 sigaddset (&sa.sa_mask, mono_gc_get_suspend_signal ());
322 if (signo == SIGSEGV) {
324 * Delay abort signals while handling SIGSEGVs since they could go unnoticed.
328 sigemptyset (&block_mask);
331 sa.sa_handler = handler;
332 sigemptyset (&sa.sa_mask);
335 g_assert (sigaction (signo, &sa, &previous_sa) != -1);
337 /* if there was already a handler in place for this signal, store it */
338 if (! (previous_sa.sa_flags & SA_SIGINFO) &&
339 (SIG_DFL == previous_sa.sa_handler)) {
340 /* it there is no sa_sigaction function and the sa_handler is default, we can safely ignore this */
342 if (mono_do_signal_chaining)
343 save_old_signal_handler (signo, &previous_sa);
348 remove_signal_handler (int signo)
351 struct sigaction *saved_action = get_saved_signal_handler (signo, TRUE);
354 sa.sa_handler = SIG_DFL;
355 sigemptyset (&sa.sa_mask);
358 sigaction (signo, &sa, NULL);
360 g_assert (sigaction (signo, saved_action, NULL) != -1);
365 mono_runtime_posix_install_handlers (void)
370 if (mini_get_debug_options ()->handle_sigint)
371 add_signal_handler (SIGINT, mono_sigint_signal_handler, SA_RESTART);
373 add_signal_handler (SIGFPE, mono_sigfpe_signal_handler, 0);
374 add_signal_handler (SIGQUIT, sigquit_signal_handler, SA_RESTART);
375 add_signal_handler (SIGILL, mono_sigill_signal_handler, 0);
376 add_signal_handler (SIGBUS, mono_sigsegv_signal_handler, 0);
377 if (mono_jit_trace_calls != NULL)
378 add_signal_handler (SIGUSR2, sigusr2_signal_handler, SA_RESTART);
380 /* it seems to have become a common bug for some programs that run as parents
381 * of many processes to block signal delivery for real time signals.
382 * We try to detect and work around their breakage here.
384 sigemptyset (&signal_set);
385 if (mono_gc_get_suspend_signal () != -1)
386 sigaddset (&signal_set, mono_gc_get_suspend_signal ());
387 if (mono_gc_get_restart_signal () != -1)
388 sigaddset (&signal_set, mono_gc_get_restart_signal ());
389 sigaddset (&signal_set, SIGCHLD);
390 sigprocmask (SIG_UNBLOCK, &signal_set, NULL);
392 signal (SIGPIPE, SIG_IGN);
394 add_signal_handler (SIGABRT, sigabrt_signal_handler, 0);
397 add_signal_handler (SIGSEGV, mono_sigsegv_signal_handler, 0);
400 #ifndef PLATFORM_MACOSX
402 mono_runtime_install_handlers (void)
404 mono_runtime_posix_install_handlers ();
409 mono_runtime_cleanup_handlers (void)
411 if (mini_get_debug_options ()->handle_sigint)
412 remove_signal_handler (SIGINT);
414 remove_signal_handler (SIGFPE);
415 remove_signal_handler (SIGQUIT);
416 remove_signal_handler (SIGILL);
417 remove_signal_handler (SIGBUS);
418 if (mono_jit_trace_calls != NULL)
419 remove_signal_handler (SIGUSR2);
421 remove_signal_handler (SIGABRT);
423 remove_signal_handler (SIGSEGV);
425 free_saved_signal_handlers ();
428 #ifdef HAVE_PROFILER_SIGNAL
430 static volatile gint32 sampling_thread_running;
432 #ifdef PLATFORM_MACOSX
434 static clock_serv_t sampling_clock_service;
437 clock_init (MonoProfilerSampleMode mode)
442 ret = host_get_clock_service (mach_host_self (), SYSTEM_CLOCK, &sampling_clock_service);
443 } while (ret == KERN_ABORTED);
445 if (ret != KERN_SUCCESS)
446 g_error ("%s: host_get_clock_service () returned %d", __func__, ret);
455 ret = mach_port_deallocate (mach_task_self (), sampling_clock_service);
456 } while (ret == KERN_ABORTED);
458 if (ret != KERN_SUCCESS)
459 g_error ("%s: mach_port_deallocate () returned %d", __func__, ret);
463 clock_get_time_ns (void)
466 mach_timespec_t mach_ts;
469 ret = clock_get_time (sampling_clock_service, &mach_ts);
470 } while (ret == KERN_ABORTED);
472 if (ret != KERN_SUCCESS)
473 g_error ("%s: clock_get_time () returned %d", __func__, ret);
475 return ((guint64) mach_ts.tv_sec * 1000000000) + (guint64) mach_ts.tv_nsec;
479 clock_sleep_ns_abs (guint64 ns_abs)
482 mach_timespec_t then, remain_unused;
484 then.tv_sec = ns_abs / 1000000000;
485 then.tv_nsec = ns_abs % 1000000000;
488 ret = clock_sleep (sampling_clock_service, TIME_ABSOLUTE, then, &remain_unused);
490 if (ret != KERN_SUCCESS && ret != KERN_ABORTED)
491 g_error ("%s: clock_sleep () returned %d", __func__, ret);
492 } while (ret == KERN_ABORTED && InterlockedRead (&sampling_thread_running));
497 clockid_t sampling_posix_clock;
500 clock_init (MonoProfilerSampleMode mode)
503 case MONO_PROFILER_SAMPLE_MODE_PROCESS: {
505 * If we don't have clock_nanosleep (), measuring the process time
506 * makes very little sense as we can only use nanosleep () to sleep on
509 #ifdef HAVE_CLOCK_NANOSLEEP
510 struct timespec ts = { 0 };
513 * Some systems (e.g. Windows Subsystem for Linux) declare the
514 * CLOCK_PROCESS_CPUTIME_ID clock but don't actually support it. For
515 * those systems, we fall back to CLOCK_MONOTONIC if we get EINVAL.
517 if (clock_nanosleep (CLOCK_PROCESS_CPUTIME_ID, TIMER_ABSTIME, &ts, NULL) != EINVAL) {
518 sampling_posix_clock = CLOCK_PROCESS_CPUTIME_ID;
525 case MONO_PROFILER_SAMPLE_MODE_REAL: sampling_posix_clock = CLOCK_MONOTONIC; break;
526 default: g_assert_not_reached (); break;
536 clock_get_time_ns (void)
540 if (clock_gettime (sampling_posix_clock, &ts) == -1)
541 g_error ("%s: clock_gettime () returned -1, errno = %d", __func__, errno);
543 return ((guint64) ts.tv_sec * 1000000000) + (guint64) ts.tv_nsec;
547 clock_sleep_ns_abs (guint64 ns_abs)
549 #ifdef HAVE_CLOCK_NANOSLEEP
551 struct timespec then;
553 then.tv_sec = ns_abs / 1000000000;
554 then.tv_nsec = ns_abs % 1000000000;
557 ret = clock_nanosleep (sampling_posix_clock, TIMER_ABSTIME, &then, NULL);
559 if (ret != 0 && ret != EINTR)
560 g_error ("%s: clock_nanosleep () returned %d", __func__, ret);
561 } while (ret == EINTR && InterlockedRead (&sampling_thread_running));
568 * What follows is a crude attempt at emulating clock_nanosleep () on OSs
569 * which don't provide it (e.g. FreeBSD).
571 * The problem with nanosleep () is that if it is interrupted by a signal,
572 * time will drift as a result of having to restart the call after the
573 * signal handler has finished. For this reason, we avoid using the rem
574 * argument of nanosleep (). Instead, before every nanosleep () call, we
575 * check if enough time has passed to satisfy the sleep request. If yes, we
576 * simply return. If not, we calculate the difference and do another sleep.
578 * This should reduce the amount of drift that happens because we account
579 * for the time spent executing the signal handler, which nanosleep () is
580 * not guaranteed to do for the rem argument.
582 * The downside to this approach is that it is slightly expensive: We have
583 * to make an extra system call to retrieve the current time whenever we're
584 * going to restart a nanosleep () call. This is unlikely to be a problem
585 * in practice since the sampling thread won't be receiving many signals in
586 * the first place (it's a tools thread, so no STW), and because typical
587 * sleep periods for the thread are many orders of magnitude bigger than
588 * the time it takes to actually perform that system call (just a few
592 diff = (gint64) ns_abs - (gint64) clock_get_time_ns ();
597 req.tv_sec = diff / 1000000000;
598 req.tv_nsec = diff % 1000000000;
600 if ((ret = nanosleep (&req, NULL)) == -1 && errno != EINTR)
601 g_error ("%s: nanosleep () returned -1, errno = %d", __func__, errno);
602 } while (ret == -1 && InterlockedRead (&sampling_thread_running));
608 static int profiler_signal;
609 static volatile gint32 sampling_thread_exiting;
611 static mono_native_thread_return_t
612 sampling_thread_func (void *data)
614 mono_threads_attach_tools_thread ();
615 mono_native_thread_set_name (mono_native_thread_id_get (), "Profiler sampler");
618 struct sched_param old_sched;
619 pthread_getschedparam (pthread_self (), &old_policy, &old_sched);
622 * Attempt to switch the thread to real time scheduling. This will not
623 * necessarily work on all OSs; for example, most Linux systems will give
624 * us EPERM here unless configured to allow this.
626 * TODO: This does not work on Mac (and maybe some other OSs). On Mac, we
627 * have to use the Mach thread policy routines to switch to real-time
628 * scheduling. This is quite tricky as we need to specify how often we'll
629 * be doing work (easy), the normal processing time needed (also easy),
630 * and the maximum amount of processing time needed (hard). This is
631 * further complicated by the fact that if we misbehave and take too long
632 * to do our work, the kernel may knock us back down to the normal thread
633 * scheduling policy without telling us.
635 struct sched_param sched = { .sched_priority = sched_get_priority_max (SCHED_FIFO) };
636 pthread_setschedparam (pthread_self (), SCHED_FIFO, &sched);
638 MonoProfilerSampleMode mode;
641 mono_profiler_get_sample_mode (NULL, &mode, NULL);
643 if (mode == MONO_PROFILER_SAMPLE_MODE_NONE) {
644 mono_profiler_sampling_thread_sleep ();
650 for (guint64 sleep = clock_get_time_ns (); InterlockedRead (&sampling_thread_running); clock_sleep_ns_abs (sleep)) {
652 MonoProfilerSampleMode new_mode;
654 mono_profiler_get_sample_mode (NULL, &new_mode, &freq);
656 if (new_mode != mode) {
661 sleep += 1000000000 / freq;
663 FOREACH_THREAD_SAFE (info) {
664 /* info should never be this thread as we're a tools thread. */
665 g_assert (mono_thread_info_get_tid (info) != mono_native_thread_id_get ());
668 * Require an ack for the last sampling signal sent to the thread
669 * so that we don't overflow the signal queue, leading to all sorts
670 * of problems (e.g. GC STW failing).
672 if (profiler_signal != SIGPROF && !InterlockedCompareExchange (&info->profiler_signal_ack, 0, 1))
675 mono_threads_pthread_kill (info, profiler_signal);
676 InterlockedIncrement (&profiler_signals_sent);
677 } FOREACH_THREAD_SAFE_END
680 InterlockedWrite (&sampling_thread_exiting, 1);
684 pthread_setschedparam (pthread_self (), old_policy, &old_sched);
686 mono_thread_info_detach ();
692 mono_runtime_shutdown_stat_profiler (void)
694 InterlockedWrite (&sampling_thread_running, 0);
696 #ifndef PLATFORM_MACOSX
698 * There is a slight problem when we're using CLOCK_PROCESS_CPUTIME_ID: If
699 * we're shutting down and there's largely no activity in the process other
700 * than waiting for the sampler thread to shut down, it can take upwards of
701 * 20 seconds (depending on a lot of factors) for us to shut down because
702 * the sleep progresses very slowly as a result of the low CPU activity.
704 * We fix this by repeatedly sending the profiler signal to the sampler
705 * thread in order to interrupt the sleep. clock_sleep_ns_abs () will check
706 * sampling_thread_running upon an interrupt and return immediately if it's
707 * zero. profiler_signal_handler () has a special case to ignore the signal
708 * for the sampler thread.
710 MonoThreadInfo *info;
712 // Did it shut down already?
713 if ((info = mono_thread_info_lookup (sampling_thread))) {
714 while (!InterlockedRead (&sampling_thread_exiting)) {
715 mono_threads_pthread_kill (info, profiler_signal);
716 mono_thread_info_usleep (10 * 1000 /* 10ms */);
719 // Make sure info can be freed.
720 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
724 mono_native_thread_join (sampling_thread);
727 * We can't safely remove the signal handler because we have no guarantee
728 * that all pending signals have been delivered at this point. This should
729 * not really be a problem anyway.
731 //remove_signal_handler (profiler_signal);
735 mono_runtime_setup_stat_profiler (void)
738 * Use a real-time signal when possible. This gives us roughly a 99% signal
739 * delivery rate in all cases. On the other hand, using a regular signal
740 * tends to result in awful delivery rates when the application is heavily
743 * We avoid real-time signals on Android as they're super broken in certain
744 * API levels (too small sigset_t, nonsensical SIGRTMIN/SIGRTMAX values,
747 * TODO: On Mac, we should explore using the Mach thread suspend/resume
748 * functions and doing the stack walk from the sampling thread. This would
749 * get us a 100% sampling rate. However, this may interfere with the GC's
750 * STW logic. Could perhaps be solved by taking the suspend lock.
752 #if defined (USE_POSIX_BACKEND) && defined (SIGRTMIN) && !defined (PLATFORM_ANDROID)
753 /* Just take the first real-time signal we can get. */
754 profiler_signal = mono_threads_suspend_search_alternative_signal ();
756 profiler_signal = SIGPROF;
759 add_signal_handler (profiler_signal, profiler_signal_handler, SA_RESTART);
761 mono_counters_register ("Sampling signals sent", MONO_COUNTER_UINT | MONO_COUNTER_PROFILER | MONO_COUNTER_MONOTONIC, &profiler_signals_sent);
762 mono_counters_register ("Sampling signals received", MONO_COUNTER_UINT | MONO_COUNTER_PROFILER | MONO_COUNTER_MONOTONIC, &profiler_signals_received);
763 mono_counters_register ("Sampling signals accepted", MONO_COUNTER_UINT | MONO_COUNTER_PROFILER | MONO_COUNTER_MONOTONIC, &profiler_signals_accepted);
764 mono_counters_register ("Shutdown signals received", MONO_COUNTER_UINT | MONO_COUNTER_PROFILER | MONO_COUNTER_MONOTONIC, &profiler_interrupt_signals_received);
766 InterlockedWrite (&sampling_thread_running, 1);
767 mono_native_thread_create (&sampling_thread, sampling_thread_func, NULL);
773 mono_runtime_shutdown_stat_profiler (void)
778 mono_runtime_setup_stat_profiler (void)
784 #endif /* defined(HOST_WATCHOS) */
787 native_stack_with_gdb (pid_t crashed_pid, const char **argv, FILE *commands, char* commands_filename)
791 gdb = g_find_program_in_path ("gdb");
798 argv [3] = commands_filename;
801 fprintf (commands, "attach %ld\n", (long) crashed_pid);
802 fprintf (commands, "info threads\n");
803 fprintf (commands, "thread apply all bt\n");
810 native_stack_with_lldb (pid_t crashed_pid, const char **argv, FILE *commands, char* commands_filename)
814 lldb = g_find_program_in_path ("lldb");
819 argv [1] = "--batch";
820 argv [2] = "--source";
821 argv [3] = commands_filename;
822 argv [4] = "--no-lldbinit";
824 fprintf (commands, "process attach --pid %ld\n", (long) crashed_pid);
825 fprintf (commands, "thread list\n");
826 fprintf (commands, "thread backtrace all\n");
827 fprintf (commands, "detach\n");
828 fprintf (commands, "quit\n");
834 mono_gdb_render_native_backtraces (pid_t crashed_pid)
837 const char *argv [10];
839 char commands_filename [] = "/tmp/mono-gdb-commands.XXXXXX";
841 if (mkstemp (commands_filename) == -1)
844 commands = fopen (commands_filename, "w");
846 unlink (commands_filename);
850 memset (argv, 0, sizeof (char*) * 10);
852 #if defined(PLATFORM_MACOSX)
853 if (native_stack_with_lldb (crashed_pid, argv, commands, commands_filename))
857 if (native_stack_with_gdb (crashed_pid, argv, commands, commands_filename))
860 #if !defined(PLATFORM_MACOSX)
861 if (native_stack_with_lldb (crashed_pid, argv, commands, commands_filename))
865 fprintf (stderr, "mono_gdb_render_native_backtraces not supported on this platform, unable to find gdb or lldb\n");
868 unlink (commands_filename);
873 execv (argv [0], (char**)argv);
877 fprintf (stderr, "mono_gdb_render_native_backtraces not supported on this platform\n");
881 #if !defined (__MACH__)
884 mono_thread_state_init_from_handle (MonoThreadUnwindState *tctx, MonoThreadInfo *info)
886 g_error ("Posix systems don't support mono_thread_state_init_from_handle");