go main 源码
golang main 代码
文件路径：/misc/cgo/testsigfwd/main.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) {
fprintf(stdout, "ok\ttestsigfwd\n");
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);
return NULL;
}
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()
}
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