mirror of
https://github.com/golang/go
synced 2024-11-05 23:36:12 -07:00
5c8fbc6f1e
Forward signals to signal handlers installed before Go installs its own, under certain circumstances. In particular, as iant@ suggests, signals are forwarded iff: (1) a non-SIG_DFL signal handler existed before Go, and (2) signal is synchronous (i.e., one of SIGSEGV, SIGBUS, SIGFPE), and (3a) signal occured on a non-Go thread, or (3b) signal occurred on a Go thread but in CGo code. Supported only on Linux, for now. Change-Id: I403219ee47b26cf65da819fb86cf1ec04d3e25f5 Reviewed-on: https://go-review.googlesource.com/8712 Reviewed-by: Ian Lance Taylor <iant@golang.org>
59 lines
1.0 KiB
Go
59 lines
1.0 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"
|
|
|
|
/*
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
int *p;
|
|
static void sigsegv() {
|
|
*p = 1;
|
|
fprintf(stderr, "ERROR: C SIGSEGV not thrown on caught?.\n");
|
|
exit(2);
|
|
}
|
|
|
|
static void sighandler(int signum) {
|
|
if (signum == SIGSEGV) {
|
|
exit(0); // success
|
|
}
|
|
}
|
|
|
|
static void __attribute__ ((constructor)) sigsetup(void) {
|
|
struct sigaction act;
|
|
act.sa_handler = &sighandler;
|
|
sigaction(SIGSEGV, &act, 0);
|
|
}
|
|
*/
|
|
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()
|
|
}
|