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