mirror of
https://github.com/golang/go
synced 2024-11-24 19:50:18 -07:00
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.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
/*
|
|
#cgo CFLAGS: -pthread
|
|
#cgo LDFLAGS: -pthread
|
|
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <pthread.h>
|
|
|
|
int *p;
|
|
static void sigsegv() {
|
|
*p = 1;
|
|
fprintf(stderr, "ERROR: C SIGSEGV not thrown on caught?.\n");
|
|
exit(2);
|
|
}
|
|
|
|
static void segvhandler(int signum) {
|
|
if (signum == SIGSEGV) {
|
|
exit(0); // success
|
|
}
|
|
}
|
|
|
|
static volatile sig_atomic_t sigioSeen;
|
|
|
|
// Use up some stack space.
|
|
static void recur(int i, char *p) {
|
|
char a[1024];
|
|
|
|
*p = '\0';
|
|
if (i > 0) {
|
|
recur(i - 1, a);
|
|
}
|
|
}
|
|
|
|
static void iohandler(int signum) {
|
|
char a[1024];
|
|
|
|
recur(4, a);
|
|
sigioSeen = 1;
|
|
}
|
|
|
|
static void* sigioThread(void* arg __attribute__ ((unused))) {
|
|
raise(SIGIO);
|
|
}
|
|
|
|
static void sigioOnThread() {
|
|
pthread_t tid;
|
|
int i;
|
|
|
|
pthread_create(&tid, NULL, sigioThread, NULL);
|
|
pthread_join(tid, NULL);
|
|
|
|
// Wait until the signal has been delivered.
|
|
i = 0;
|
|
while (!sigioSeen) {
|
|
if (sched_yield() < 0) {
|
|
perror("sched_yield");
|
|
}
|
|
i++;
|
|
if (i > 10000) {
|
|
fprintf(stderr, "looping too long waiting for signal\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __attribute__ ((constructor)) sigsetup(void) {
|
|
struct sigaction act;
|
|
|
|
memset(&act, 0, sizeof act);
|
|
act.sa_handler = segvhandler;
|
|
sigaction(SIGSEGV, &act, NULL);
|
|
|
|
act.sa_handler = iohandler;
|
|
sigaction(SIGIO, &act, NULL);
|
|
}
|
|
*/
|
|
import "C"
|
|
|
|
var p *byte
|
|
|
|
func f() (ret bool) {
|
|
defer func() {
|
|
if recover() == nil {
|
|
fmt.Errorf("ERROR: couldn't raise SIGSEGV in Go.")
|
|
C.exit(2)
|
|
}
|
|
ret = true
|
|
}()
|
|
*p = 1
|
|
return false
|
|
}
|
|
|
|
func main() {
|
|
// Test that the signal originating in Go is handled (and recovered) by Go.
|
|
if !f() {
|
|
fmt.Errorf("couldn't recover from SIGSEGV in Go.")
|
|
C.exit(2)
|
|
}
|
|
|
|
// Test that the signal originating in C is handled by C.
|
|
C.sigsegv()
|
|
}
|