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https://github.com/golang/go
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54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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struct sigaction sa;
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struct sigaction osa;
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static void (*oldHandler)(int, siginfo_t*, void*);
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static void handler(int signo, siginfo_t* info, void* ctxt) {
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if (oldHandler) {
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oldHandler(signo, info, ctxt);
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}
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}
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int install_handler() {
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// Install our own signal handler.
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memset(&sa, 0, sizeof sa);
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sa.sa_sigaction = handler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_ONSTACK | SA_SIGINFO;
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memset(&osa, 0, sizeof osa);
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sigemptyset(&osa.sa_mask);
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if (sigaction(SIGSEGV, &sa, &osa) < 0) {
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perror("sigaction");
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return 2;
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}
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if (osa.sa_handler == SIG_DFL || (osa.sa_flags&SA_ONSTACK) == 0) {
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fprintf(stderr, "Go runtime did not install signal handler\n");
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return 2;
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}
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oldHandler = osa.sa_sigaction;
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return 0;
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}
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int check_handler() {
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if (sigaction(SIGSEGV, NULL, &sa) < 0) {
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perror("sigaction check");
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return 2;
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}
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if (sa.sa_sigaction != handler) {
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fprintf(stderr, "ERROR: wrong signal handler: %p != %p\n", sa.sa_sigaction, handler);
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return 2;
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}
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return 0;
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}
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