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https://github.com/golang/go
synced 2024-11-24 12:00:14 -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.
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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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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.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 sighandler(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 void __attribute__ ((constructor)) sigsetup(void) {
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struct sigaction act;
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act.sa_handler = &sighandler;
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sigaction(SIGSEGV, &act, 0);
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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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