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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;
}