mirror of
https://github.com/golang/go
synced 2024-09-29 18:34:33 -06:00
1f605175b0
This ensures that runtime's signal handlers pass through the TSAN and MSAN libc interceptors and subsequent calls to the intercepted sigaction function from C will correctly see them. Fixes #17753. Change-Id: I9798bb50291a4b8fa20caa39c02a4465ec40bb8d Reviewed-on: https://go-review.googlesource.com/33142 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
// Copyright 2016 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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// This program failed when run under the C/C++ ThreadSanitizer. The TSAN
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// sigaction function interceptor returned SIG_DFL instead of the Go runtime's
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// handler in registerSegvForwarder.
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/*
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#cgo CFLAGS: -fsanitize=thread
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#cgo LDFLAGS: -fsanitize=thread
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct sigaction prev_sa;
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void forwardSignal(int signo, siginfo_t *info, void *context) {
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// One of sa_sigaction and/or sa_handler
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if ((prev_sa.sa_flags&SA_SIGINFO) != 0) {
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prev_sa.sa_sigaction(signo, info, context);
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return;
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}
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if (prev_sa.sa_handler != SIG_IGN && prev_sa.sa_handler != SIG_DFL) {
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prev_sa.sa_handler(signo);
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return;
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}
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fprintf(stderr, "No Go handler to forward to!\n");
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abort();
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}
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void registerSegvFowarder() {
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
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sa.sa_sigaction = forwardSignal;
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if (sigaction(SIGSEGV, &sa, &prev_sa) != 0) {
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perror("failed to register SEGV forwarder");
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exit(EXIT_FAILURE);
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}
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}
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*/
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import "C"
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func main() {
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C.registerSegvFowarder()
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defer func() {
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recover()
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}()
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var nilp *int
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*nilp = 42
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}
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