mirror of git://gcc.gnu.org/git/gcc.git
141 lines
3.1 KiB
Go
141 lines
3.1 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 syscall_test
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"os/signal"
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"path/filepath"
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"syscall"
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"testing"
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"time"
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)
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func TestMain(m *testing.M) {
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if os.Getenv("GO_DEATHSIG_PARENT") == "1" {
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deathSignalParent()
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} else if os.Getenv("GO_DEATHSIG_CHILD") == "1" {
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deathSignalChild()
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}
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os.Exit(m.Run())
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}
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func TestLinuxDeathSignal(t *testing.T) {
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if os.Getuid() != 0 {
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t.Skip("skipping root only test")
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}
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// Copy the test binary to a location that a non-root user can read/execute
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// after we drop privileges
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tempDir, err := ioutil.TempDir("", "TestDeathSignal")
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if err != nil {
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t.Fatalf("cannot create temporary directory: %v", err)
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}
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defer os.RemoveAll(tempDir)
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os.Chmod(tempDir, 0755)
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tmpBinary := filepath.Join(tempDir, filepath.Base(os.Args[0]))
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src, err := os.Open(os.Args[0])
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if err != nil {
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t.Fatalf("cannot open binary %q, %v", os.Args[0], err)
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}
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defer src.Close()
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dst, err := os.OpenFile(tmpBinary, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
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if err != nil {
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t.Fatalf("cannot create temporary binary %q, %v", tmpBinary, err)
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}
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if _, err := io.Copy(dst, src); err != nil {
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t.Fatalf("failed to copy test binary to %q, %v", tmpBinary, err)
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}
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err = dst.Close()
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if err != nil {
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t.Fatalf("failed to close test binary %q, %v", tmpBinary, err)
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}
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cmd := exec.Command(tmpBinary)
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cmd.Env = []string{"GO_DEATHSIG_PARENT=1"}
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chldStdin, err := cmd.StdinPipe()
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if err != nil {
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t.Fatalf("failed to create new stdin pipe: %v", err)
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}
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chldStdout, err := cmd.StdoutPipe()
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if err != nil {
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t.Fatalf("failed to create new stdout pipe: %v", err)
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}
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cmd.Stderr = os.Stderr
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err = cmd.Start()
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defer cmd.Wait()
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if err != nil {
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t.Fatalf("failed to start first child process: %v", err)
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}
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chldPipe := bufio.NewReader(chldStdout)
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if got, err := chldPipe.ReadString('\n'); got == "start\n" {
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syscall.Kill(cmd.Process.Pid, syscall.SIGTERM)
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go func() {
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time.Sleep(5 * time.Second)
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chldStdin.Close()
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}()
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want := "ok\n"
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if got, err = chldPipe.ReadString('\n'); got != want {
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t.Fatalf("expected %q, received %q, %v", want, got, err)
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}
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} else {
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t.Fatalf("did not receive start from child, received %q, %v", got, err)
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}
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}
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func deathSignalParent() {
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cmd := exec.Command(os.Args[0])
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cmd.Env = []string{"GO_DEATHSIG_CHILD=1"}
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cmd.Stdin = os.Stdin
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cmd.Stdout = os.Stdout
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attrs := syscall.SysProcAttr{
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Pdeathsig: syscall.SIGUSR1,
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// UID/GID 99 is the user/group "nobody" on RHEL/Fedora and is
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// unused on Ubuntu
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Credential: &syscall.Credential{Uid: 99, Gid: 99},
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}
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cmd.SysProcAttr = &attrs
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err := cmd.Start()
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if err != nil {
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fmt.Fprintf(os.Stderr, "death signal parent error: %v\n", err)
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os.Exit(1)
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}
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cmd.Wait()
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os.Exit(0)
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}
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func deathSignalChild() {
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c := make(chan os.Signal, 1)
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signal.Notify(c, syscall.SIGUSR1)
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go func() {
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<-c
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fmt.Println("ok")
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os.Exit(0)
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}()
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fmt.Println("start")
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buf := make([]byte, 32)
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os.Stdin.Read(buf)
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// We expected to be signaled before stdin closed
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fmt.Println("not ok")
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os.Exit(1)
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}
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