| 1 | # nocrash.m4 serial 5 |
| 2 | dnl Copyright (C) 2005, 2009-2019 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl with or without modifications, as long as this notice is preserved. |
| 6 | |
| 7 | dnl Based on libsigsegv, from Bruno Haible and Paolo Bonzini. |
| 8 | |
| 9 | AC_PREREQ([2.13]) |
| 10 | |
| 11 | dnl Expands to some code for use in .c programs that will cause the configure |
| 12 | dnl test to exit instead of crashing. This is useful to avoid triggering |
| 13 | dnl action from a background debugger and to avoid core dumps. |
| 14 | dnl Usage: ... |
| 15 | dnl ]GL_NOCRASH[ |
| 16 | dnl ... |
| 17 | dnl int main() { nocrash_init(); ... } |
| 18 | AC_DEFUN([GL_NOCRASH],[[ |
| 19 | #include <stdlib.h> |
| 20 | #if defined __MACH__ && defined __APPLE__ |
| 21 | /* Avoid a crash on Mac OS X. */ |
| 22 | #include <mach/mach.h> |
| 23 | #include <mach/mach_error.h> |
| 24 | #include <mach/thread_status.h> |
| 25 | #include <mach/exception.h> |
| 26 | #include <mach/task.h> |
| 27 | #include <pthread.h> |
| 28 | /* The exception port on which our thread listens. */ |
| 29 | static mach_port_t our_exception_port; |
| 30 | /* The main function of the thread listening for exceptions of type |
| 31 | EXC_BAD_ACCESS. */ |
| 32 | static void * |
| 33 | mach_exception_thread (void *arg) |
| 34 | { |
| 35 | /* Buffer for a message to be received. */ |
| 36 | struct { |
| 37 | mach_msg_header_t head; |
| 38 | mach_msg_body_t msgh_body; |
| 39 | char data[1024]; |
| 40 | } msg; |
| 41 | mach_msg_return_t retval; |
| 42 | /* Wait for a message on the exception port. */ |
| 43 | retval = mach_msg (&msg.head, MACH_RCV_MSG | MACH_RCV_LARGE, 0, sizeof (msg), |
| 44 | our_exception_port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL); |
| 45 | if (retval != MACH_MSG_SUCCESS) |
| 46 | abort (); |
| 47 | exit (1); |
| 48 | } |
| 49 | static void |
| 50 | nocrash_init (void) |
| 51 | { |
| 52 | mach_port_t self = mach_task_self (); |
| 53 | /* Allocate a port on which the thread shall listen for exceptions. */ |
| 54 | if (mach_port_allocate (self, MACH_PORT_RIGHT_RECEIVE, &our_exception_port) |
| 55 | == KERN_SUCCESS) { |
| 56 | /* See https://web.mit.edu/darwin/src/modules/xnu/osfmk/man/mach_port_insert_right.html. */ |
| 57 | if (mach_port_insert_right (self, our_exception_port, our_exception_port, |
| 58 | MACH_MSG_TYPE_MAKE_SEND) |
| 59 | == KERN_SUCCESS) { |
| 60 | /* The exceptions we want to catch. Only EXC_BAD_ACCESS is interesting |
| 61 | for us. */ |
| 62 | exception_mask_t mask = EXC_MASK_BAD_ACCESS; |
| 63 | /* Create the thread listening on the exception port. */ |
| 64 | pthread_attr_t attr; |
| 65 | pthread_t thread; |
| 66 | if (pthread_attr_init (&attr) == 0 |
| 67 | && pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED) == 0 |
| 68 | && pthread_create (&thread, &attr, mach_exception_thread, NULL) == 0) { |
| 69 | pthread_attr_destroy (&attr); |
| 70 | /* Replace the exception port info for these exceptions with our own. |
| 71 | Note that we replace the exception port for the entire task, not only |
| 72 | for a particular thread. This has the effect that when our exception |
| 73 | port gets the message, the thread specific exception port has already |
| 74 | been asked, and we don't need to bother about it. |
| 75 | See https://web.mit.edu/darwin/src/modules/xnu/osfmk/man/task_set_exception_ports.html. */ |
| 76 | task_set_exception_ports (self, mask, our_exception_port, |
| 77 | EXCEPTION_DEFAULT, MACHINE_THREAD_STATE); |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | #elif defined _WIN32 && ! defined __CYGWIN__ |
| 83 | /* Avoid a crash on native Windows. */ |
| 84 | #define WIN32_LEAN_AND_MEAN |
| 85 | #include <windows.h> |
| 86 | #include <winerror.h> |
| 87 | static LONG WINAPI |
| 88 | exception_filter (EXCEPTION_POINTERS *ExceptionInfo) |
| 89 | { |
| 90 | switch (ExceptionInfo->ExceptionRecord->ExceptionCode) |
| 91 | { |
| 92 | case EXCEPTION_ACCESS_VIOLATION: |
| 93 | case EXCEPTION_IN_PAGE_ERROR: |
| 94 | case EXCEPTION_STACK_OVERFLOW: |
| 95 | case EXCEPTION_GUARD_PAGE: |
| 96 | case EXCEPTION_PRIV_INSTRUCTION: |
| 97 | case EXCEPTION_ILLEGAL_INSTRUCTION: |
| 98 | case EXCEPTION_DATATYPE_MISALIGNMENT: |
| 99 | case EXCEPTION_ARRAY_BOUNDS_EXCEEDED: |
| 100 | case EXCEPTION_NONCONTINUABLE_EXCEPTION: |
| 101 | exit (1); |
| 102 | } |
| 103 | return EXCEPTION_CONTINUE_SEARCH; |
| 104 | } |
| 105 | static void |
| 106 | nocrash_init (void) |
| 107 | { |
| 108 | SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) exception_filter); |
| 109 | } |
| 110 | #else |
| 111 | /* Avoid a crash on POSIX systems. */ |
| 112 | #include <signal.h> |
| 113 | #include <unistd.h> |
| 114 | /* A POSIX signal handler. */ |
| 115 | static void |
| 116 | exception_handler (int sig) |
| 117 | { |
| 118 | _exit (1); |
| 119 | } |
| 120 | static void |
| 121 | nocrash_init (void) |
| 122 | { |
| 123 | #ifdef SIGSEGV |
| 124 | signal (SIGSEGV, exception_handler); |
| 125 | #endif |
| 126 | #ifdef SIGBUS |
| 127 | signal (SIGBUS, exception_handler); |
| 128 | #endif |
| 129 | } |
| 130 | #endif |
| 131 | ]]) |