3 dnl Copyright (C) 2005, 2009-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 dnl Based on libsigsegv, from Bruno Haible and Paolo Bonzini.
12 dnl Expands to some code for use in .c programs that will cause the configure
13 dnl test to exit instead of crashing. This is useful to avoid triggering
14 dnl action from a background debugger and to avoid core dumps.
18 dnl int main() { nocrash_init(); ... }
19 AC_DEFUN([GL_NOCRASH],[[
21 #if defined __MACH__ && defined __APPLE__
22 /* Avoid a crash on Mac OS X. */
23 #include <mach/mach.h>
24 #include <mach/mach_error.h>
25 #include <mach/thread_status.h>
26 #include <mach/exception.h>
27 #include <mach/task.h>
29 /* The exception port on which our thread listens. */
30 static mach_port_t our_exception_port;
31 /* The main function of the thread listening for exceptions of type
34 mach_exception_thread (void *arg)
36 /* Buffer for a message to be received. */
38 mach_msg_header_t head;
39 mach_msg_body_t msgh_body;
42 mach_msg_return_t retval;
43 /* Wait for a message on the exception port. */
44 retval = mach_msg (&msg.head, MACH_RCV_MSG | MACH_RCV_LARGE, 0, sizeof (msg),
45 our_exception_port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
46 if (retval != MACH_MSG_SUCCESS)
53 mach_port_t self = mach_task_self ();
54 /* Allocate a port on which the thread shall listen for exceptions. */
55 if (mach_port_allocate (self, MACH_PORT_RIGHT_RECEIVE, &our_exception_port)
57 /* See https://web.mit.edu/darwin/src/modules/xnu/osfmk/man/mach_port_insert_right.html. */
58 if (mach_port_insert_right (self, our_exception_port, our_exception_port,
59 MACH_MSG_TYPE_MAKE_SEND)
61 /* The exceptions we want to catch. Only EXC_BAD_ACCESS is interesting
63 exception_mask_t mask = EXC_MASK_BAD_ACCESS;
64 /* Create the thread listening on the exception port. */
67 if (pthread_attr_init (&attr) == 0
68 && pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED) == 0
69 && pthread_create (&thread, &attr, mach_exception_thread, NULL) == 0) {
70 pthread_attr_destroy (&attr);
71 /* Replace the exception port info for these exceptions with our own.
72 Note that we replace the exception port for the entire task, not only
73 for a particular thread. This has the effect that when our exception
74 port gets the message, the thread specific exception port has already
75 been asked, and we don't need to bother about it.
76 See https://web.mit.edu/darwin/src/modules/xnu/osfmk/man/task_set_exception_ports.html. */
77 task_set_exception_ports (self, mask, our_exception_port,
78 EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
83 #elif defined _WIN32 && ! defined __CYGWIN__
84 /* Avoid a crash on native Windows. */
85 #define WIN32_LEAN_AND_MEAN
89 exception_filter (EXCEPTION_POINTERS *ExceptionInfo)
91 switch (ExceptionInfo->ExceptionRecord->ExceptionCode)
93 case EXCEPTION_ACCESS_VIOLATION:
94 case EXCEPTION_IN_PAGE_ERROR:
95 case EXCEPTION_STACK_OVERFLOW:
96 case EXCEPTION_GUARD_PAGE:
97 case EXCEPTION_PRIV_INSTRUCTION:
98 case EXCEPTION_ILLEGAL_INSTRUCTION:
99 case EXCEPTION_DATATYPE_MISALIGNMENT:
100 case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
101 case EXCEPTION_NONCONTINUABLE_EXCEPTION:
104 return EXCEPTION_CONTINUE_SEARCH;
109 SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) exception_filter);
112 /* Avoid a crash on POSIX systems. */
115 /* A POSIX signal handler. */
117 exception_handler (int sig)
125 signal (SIGSEGV, exception_handler);
128 signal (SIGBUS, exception_handler);