mirror of
https://github.com/golang/go
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fbdfa99246
Only install signal handlers for synchronous signals that become run-time panics. Set the SA_ONSTACK flag for other signal handlers as needed. Fixes #13028. Update #12465. Update #13034. Update #13042. Change-Id: I28375e70641f60630e10f3c86e24b6e4f8a35cc9 Reviewed-on: https://go-review.googlesource.com/17903 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
113 lines
1.9 KiB
Go
113 lines
1.9 KiB
Go
// 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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package main
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import "fmt"
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/*
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#cgo CFLAGS: -pthread
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#cgo LDFLAGS: -pthread
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <pthread.h>
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int *p;
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static void sigsegv() {
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*p = 1;
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fprintf(stderr, "ERROR: C SIGSEGV not thrown on caught?.\n");
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exit(2);
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}
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static void segvhandler(int signum) {
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if (signum == SIGSEGV) {
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exit(0); // success
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}
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}
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static volatile sig_atomic_t sigioSeen;
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// Use up some stack space.
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static void recur(int i, char *p) {
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char a[1024];
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*p = '\0';
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if (i > 0) {
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recur(i - 1, a);
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}
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}
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static void iohandler(int signum) {
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char a[1024];
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recur(4, a);
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sigioSeen = 1;
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}
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static void* sigioThread(void* arg __attribute__ ((unused))) {
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raise(SIGIO);
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}
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static void sigioOnThread() {
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pthread_t tid;
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int i;
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pthread_create(&tid, NULL, sigioThread, NULL);
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pthread_join(tid, NULL);
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// Wait until the signal has been delivered.
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i = 0;
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while (!sigioSeen) {
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if (sched_yield() < 0) {
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perror("sched_yield");
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}
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i++;
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if (i > 10000) {
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fprintf(stderr, "looping too long waiting for signal\n");
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exit(EXIT_FAILURE);
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}
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}
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}
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static void __attribute__ ((constructor)) sigsetup(void) {
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struct sigaction act;
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memset(&act, 0, sizeof act);
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act.sa_handler = segvhandler;
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sigaction(SIGSEGV, &act, NULL);
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act.sa_handler = iohandler;
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sigaction(SIGIO, &act, NULL);
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}
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*/
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import "C"
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var p *byte
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func f() (ret bool) {
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defer func() {
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if recover() == nil {
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fmt.Errorf("ERROR: couldn't raise SIGSEGV in Go.")
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C.exit(2)
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}
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ret = true
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}()
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*p = 1
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return false
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}
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func main() {
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// Test that the signal originating in Go is handled (and recovered) by Go.
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if !f() {
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fmt.Errorf("couldn't recover from SIGSEGV in Go.")
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C.exit(2)
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}
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// Test that the signal originating in C is handled by C.
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C.sigsegv()
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}
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