| 1 | # nocrash.m4 serial 5
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| 2 | dnl Copyright (C) 2005, 2009-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl Based on libsigsegv, from Bruno Haible and Paolo Bonzini.
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| 8 |
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| 9 | AC_PREREQ([2.13])
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| 10 |
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| 11 | dnl Expands to some code for use in .c programs that will cause the configure
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| 12 | dnl test to exit instead of crashing. This is useful to avoid triggering
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| 13 | dnl action from a background debugger and to avoid core dumps.
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| 14 | dnl Usage: ...
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| 15 | dnl ]GL_NOCRASH[
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| 16 | dnl ...
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| 17 | dnl int main() { nocrash_init(); ... }
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| 18 | AC_DEFUN([GL_NOCRASH],[[
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| 19 | #include <stdlib.h>
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| 20 | #if defined __MACH__ && defined __APPLE__
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| 21 | /* Avoid a crash on Mac OS X. */
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| 22 | #include <mach/mach.h>
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| 23 | #include <mach/mach_error.h>
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| 24 | #include <mach/thread_status.h>
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| 25 | #include <mach/exception.h>
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| 26 | #include <mach/task.h>
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| 27 | #include <pthread.h>
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| 28 | /* The exception port on which our thread listens. */
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| 29 | static mach_port_t our_exception_port;
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| 30 | /* The main function of the thread listening for exceptions of type
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| 31 | EXC_BAD_ACCESS. */
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| 32 | static void *
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| 33 | mach_exception_thread (void *arg)
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| 34 | {
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| 35 | /* Buffer for a message to be received. */
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| 36 | struct {
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| 37 | mach_msg_header_t head;
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| 38 | mach_msg_body_t msgh_body;
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| 39 | char data[1024];
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| 40 | } msg;
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| 41 | mach_msg_return_t retval;
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| 42 | /* Wait for a message on the exception port. */
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| 43 | retval = mach_msg (&msg.head, MACH_RCV_MSG | MACH_RCV_LARGE, 0, sizeof (msg),
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| 44 | our_exception_port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
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| 45 | if (retval != MACH_MSG_SUCCESS)
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| 46 | abort ();
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| 47 | exit (1);
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| 48 | }
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| 49 | static void
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| 50 | nocrash_init (void)
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| 51 | {
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| 52 | mach_port_t self = mach_task_self ();
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| 53 | /* Allocate a port on which the thread shall listen for exceptions. */
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| 54 | if (mach_port_allocate (self, MACH_PORT_RIGHT_RECEIVE, &our_exception_port)
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| 55 | == KERN_SUCCESS) {
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| 56 | /* See https://web.mit.edu/darwin/src/modules/xnu/osfmk/man/mach_port_insert_right.html. */
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| 57 | if (mach_port_insert_right (self, our_exception_port, our_exception_port,
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| 58 | MACH_MSG_TYPE_MAKE_SEND)
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| 59 | == KERN_SUCCESS) {
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| 60 | /* The exceptions we want to catch. Only EXC_BAD_ACCESS is interesting
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| 61 | for us. */
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| 62 | exception_mask_t mask = EXC_MASK_BAD_ACCESS;
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| 63 | /* Create the thread listening on the exception port. */
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| 64 | pthread_attr_t attr;
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| 65 | pthread_t thread;
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| 66 | if (pthread_attr_init (&attr) == 0
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| 67 | && pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED) == 0
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| 68 | && pthread_create (&thread, &attr, mach_exception_thread, NULL) == 0) {
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| 69 | pthread_attr_destroy (&attr);
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| 70 | /* Replace the exception port info for these exceptions with our own.
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| 71 | Note that we replace the exception port for the entire task, not only
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| 72 | for a particular thread. This has the effect that when our exception
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| 73 | port gets the message, the thread specific exception port has already
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| 74 | been asked, and we don't need to bother about it.
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| 75 | See https://web.mit.edu/darwin/src/modules/xnu/osfmk/man/task_set_exception_ports.html. */
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| 76 | task_set_exception_ports (self, mask, our_exception_port,
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| 77 | EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
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| 78 | }
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| 79 | }
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| 80 | }
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| 81 | }
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| 82 | #elif defined _WIN32 && ! defined __CYGWIN__
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| 83 | /* Avoid a crash on native Windows. */
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| 84 | #define WIN32_LEAN_AND_MEAN
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| 85 | #include <windows.h>
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| 86 | #include <winerror.h>
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| 87 | static LONG WINAPI
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| 88 | exception_filter (EXCEPTION_POINTERS *ExceptionInfo)
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| 89 | {
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| 90 | switch (ExceptionInfo->ExceptionRecord->ExceptionCode)
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| 91 | {
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| 92 | case EXCEPTION_ACCESS_VIOLATION:
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| 93 | case EXCEPTION_IN_PAGE_ERROR:
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| 94 | case EXCEPTION_STACK_OVERFLOW:
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| 95 | case EXCEPTION_GUARD_PAGE:
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| 96 | case EXCEPTION_PRIV_INSTRUCTION:
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| 97 | case EXCEPTION_ILLEGAL_INSTRUCTION:
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| 98 | case EXCEPTION_DATATYPE_MISALIGNMENT:
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| 99 | case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
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| 100 | case EXCEPTION_NONCONTINUABLE_EXCEPTION:
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| 101 | exit (1);
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| 102 | }
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| 103 | return EXCEPTION_CONTINUE_SEARCH;
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| 104 | }
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| 105 | static void
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| 106 | nocrash_init (void)
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| 107 | {
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| 108 | SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) exception_filter);
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| 109 | }
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| 110 | #else
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| 111 | /* Avoid a crash on POSIX systems. */
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| 112 | #include <signal.h>
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| 113 | #include <unistd.h>
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| 114 | /* A POSIX signal handler. */
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| 115 | static void
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| 116 | exception_handler (int sig)
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| 117 | {
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| 118 | _exit (1);
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| 119 | }
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| 120 | static void
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| 121 | nocrash_init (void)
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| 122 | {
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| 123 | #ifdef SIGSEGV
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| 124 | signal (SIGSEGV, exception_handler);
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| 125 | #endif
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| 126 | #ifdef SIGBUS
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| 127 | signal (SIGBUS, exception_handler);
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| 128 | #endif
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| 129 | }
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| 130 | #endif
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| 131 | ]])
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