mirror of
https://git.savannah.gnu.org/git/emacs.git
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115498702d
This incorporates mostly just copyright-year changes, plus recent minor updates from glibc for the non-Emacs regular expression code.
132 lines
4.4 KiB
Plaintext
132 lines
4.4 KiB
Plaintext
# nocrash.m4 serial 5
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dnl Copyright (C) 2005, 2009-2019 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl Based on libsigsegv, from Bruno Haible and Paolo Bonzini.
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AC_PREREQ([2.13])
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dnl Expands to some code for use in .c programs that will cause the configure
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dnl test to exit instead of crashing. This is useful to avoid triggering
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dnl action from a background debugger and to avoid core dumps.
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dnl Usage: ...
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dnl ]GL_NOCRASH[
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dnl ...
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dnl int main() { nocrash_init(); ... }
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AC_DEFUN([GL_NOCRASH],[[
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#include <stdlib.h>
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#if defined __MACH__ && defined __APPLE__
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/* Avoid a crash on Mac OS X. */
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#include <mach/mach.h>
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#include <mach/mach_error.h>
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#include <mach/thread_status.h>
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#include <mach/exception.h>
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#include <mach/task.h>
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#include <pthread.h>
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/* The exception port on which our thread listens. */
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static mach_port_t our_exception_port;
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/* The main function of the thread listening for exceptions of type
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EXC_BAD_ACCESS. */
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static void *
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mach_exception_thread (void *arg)
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{
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/* Buffer for a message to be received. */
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struct {
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mach_msg_header_t head;
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mach_msg_body_t msgh_body;
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char data[1024];
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} msg;
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mach_msg_return_t retval;
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/* Wait for a message on the exception port. */
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retval = mach_msg (&msg.head, MACH_RCV_MSG | MACH_RCV_LARGE, 0, sizeof (msg),
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our_exception_port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
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if (retval != MACH_MSG_SUCCESS)
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abort ();
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exit (1);
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}
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static void
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nocrash_init (void)
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{
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mach_port_t self = mach_task_self ();
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/* Allocate a port on which the thread shall listen for exceptions. */
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if (mach_port_allocate (self, MACH_PORT_RIGHT_RECEIVE, &our_exception_port)
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== KERN_SUCCESS) {
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/* See http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/mach_port_insert_right.html. */
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if (mach_port_insert_right (self, our_exception_port, our_exception_port,
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MACH_MSG_TYPE_MAKE_SEND)
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== KERN_SUCCESS) {
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/* The exceptions we want to catch. Only EXC_BAD_ACCESS is interesting
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for us. */
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exception_mask_t mask = EXC_MASK_BAD_ACCESS;
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/* Create the thread listening on the exception port. */
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pthread_attr_t attr;
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pthread_t thread;
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if (pthread_attr_init (&attr) == 0
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&& pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED) == 0
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&& pthread_create (&thread, &attr, mach_exception_thread, NULL) == 0) {
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pthread_attr_destroy (&attr);
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/* Replace the exception port info for these exceptions with our own.
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Note that we replace the exception port for the entire task, not only
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for a particular thread. This has the effect that when our exception
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port gets the message, the thread specific exception port has already
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been asked, and we don't need to bother about it.
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See http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/task_set_exception_ports.html. */
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task_set_exception_ports (self, mask, our_exception_port,
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EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
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}
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}
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}
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}
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#elif defined _WIN32 && ! defined __CYGWIN__
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/* Avoid a crash on native Windows. */
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <winerror.h>
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static LONG WINAPI
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exception_filter (EXCEPTION_POINTERS *ExceptionInfo)
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{
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switch (ExceptionInfo->ExceptionRecord->ExceptionCode)
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{
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case EXCEPTION_ACCESS_VIOLATION:
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case EXCEPTION_IN_PAGE_ERROR:
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case EXCEPTION_STACK_OVERFLOW:
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case EXCEPTION_GUARD_PAGE:
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case EXCEPTION_PRIV_INSTRUCTION:
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case EXCEPTION_ILLEGAL_INSTRUCTION:
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case EXCEPTION_DATATYPE_MISALIGNMENT:
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case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
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case EXCEPTION_NONCONTINUABLE_EXCEPTION:
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exit (1);
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}
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return EXCEPTION_CONTINUE_SEARCH;
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}
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static void
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nocrash_init (void)
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{
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SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) exception_filter);
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}
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#else
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/* Avoid a crash on POSIX systems. */
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#include <signal.h>
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#include <unistd.h>
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/* A POSIX signal handler. */
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static void
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exception_handler (int sig)
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{
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_exit (1);
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}
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static void
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nocrash_init (void)
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{
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#ifdef SIGSEGV
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signal (SIGSEGV, exception_handler);
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#endif
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#ifdef SIGBUS
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signal (SIGBUS, exception_handler);
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#endif
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}
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#endif
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]])
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