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https://github.com/golang/go
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62e1302267
os/signal.Notify requires that "the caller must ensure that c has sufficient buffer space to keep up with the expected signal rate" as it does a nonblocking send when it receives a signal. The test currently using a unbuffered channel, which means it may miss the signal if the signal arrives before the channel receive operation. Fixes #52998. Change-Id: Icdcab9396d735506480ef880fb45a4669fa7cc8f Reviewed-on: https://go-review.googlesource.com/c/go/+/407888 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Bryan Mills <bcmills@google.com> Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Gopher Robot <gobot@golang.org>
36 lines
929 B
Go
36 lines
929 B
Go
// Copyright 2017 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 hung when run under the C/C++ ThreadSanitizer. TSAN installs a
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// libc interceptor that writes signal handlers to a global variable within the
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// TSAN runtime instead of making a sigaction system call. A bug in
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// syscall.runtime_AfterForkInChild corrupted TSAN's signal forwarding table
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// during calls to (*os/exec.Cmd).Run, causing the parent process to fail to
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// invoke signal handlers.
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import (
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"fmt"
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"os"
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"os/exec"
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"os/signal"
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"syscall"
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)
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import "C"
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func main() {
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ch := make(chan os.Signal, 1)
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signal.Notify(ch, syscall.SIGUSR1)
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if err := exec.Command("true").Run(); err != nil {
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fmt.Fprintf(os.Stderr, "Unexpected error from `true`: %v", err)
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os.Exit(1)
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}
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syscall.Kill(syscall.Getpid(), syscall.SIGUSR1)
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<-ch
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}
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