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// 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.
// Test broken pipes on Unix systems.
// +build !windows,!plan9,!nacl
package os_test
import (
"fmt"
"internal/testenv"
"os"
osexec "os/exec"
"os/signal"
"syscall"
"testing"
)
func TestEPIPE(t *testing.T) {
r, w, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
if err := r.Close(); err != nil {
t.Fatal(err)
}
// Every time we write to the pipe we should get an EPIPE.
for i := 0; i < 20; i++ {
_, err = w.Write([]byte("hi"))
if err == nil {
t.Fatal("unexpected success of Write to broken pipe")
}
if pe, ok := err.(*os.PathError); ok {
err = pe.Err
}
if se, ok := err.(*os.SyscallError); ok {
err = se.Err
}
if err != syscall.EPIPE {
t.Errorf("iteration %d: got %v, expected EPIPE", i, err)
}
}
}
func TestStdPipe(t *testing.T) {
testenv.MustHaveExec(t)
r, w, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
if err := r.Close(); err != nil {
t.Fatal(err)
}
// Invoke the test program to run the test and write to a closed pipe.
// If sig is false:
// writing to stdout or stderr should cause an immediate SIGPIPE;
// writing to descriptor 3 should fail with EPIPE and then exit 0.
// If sig is true:
// all writes should fail with EPIPE and then exit 0.
for _, sig := range []bool{false, true} {
for dest := 1; dest < 4; dest++ {
cmd := osexec.Command(os.Args[0], "-test.run", "TestStdPipeHelper")
cmd.Stdout = w
cmd.Stderr = w
cmd.ExtraFiles = []*os.File{w}
cmd.Env = append(os.Environ(), fmt.Sprintf("GO_TEST_STD_PIPE_HELPER=%d", dest))
if sig {
cmd.Env = append(cmd.Env, "GO_TEST_STD_PIPE_HELPER_SIGNAL=1")
}
if err := cmd.Run(); err == nil {
if !sig && dest < 3 {
t.Errorf("unexpected success of write to closed pipe %d sig %t in child", dest, sig)
}
} else if ee, ok := err.(*osexec.ExitError); !ok {
t.Errorf("unexpected exec error type %T: %v", err, err)
} else if ws, ok := ee.Sys().(syscall.WaitStatus); !ok {
t.Errorf("unexpected wait status type %T: %v", ee.Sys(), ee.Sys())
} else if ws.Signaled() && ws.Signal() == syscall.SIGPIPE {
if sig || dest > 2 {
t.Errorf("unexpected SIGPIPE signal for descriptor %d sig %t", dest, sig)
}
} else {
t.Errorf("unexpected exit status %v for descriptor %ds sig %t", err, dest, sig)
}
}
}
}
// This is a helper for TestStdPipe. It's not a test in itself.
func TestStdPipeHelper(t *testing.T) {
if os.Getenv("GO_TEST_STD_PIPE_HELPER_SIGNAL") != "" {
signal.Notify(make(chan os.Signal, 1), syscall.SIGPIPE)
}
switch os.Getenv("GO_TEST_STD_PIPE_HELPER") {
case "1":
os.Stdout.Write([]byte("stdout"))
case "2":
os.Stderr.Write([]byte("stderr"))
case "3":
if _, err := os.NewFile(3, "3").Write([]byte("3")); err == nil {
os.Exit(3)
}
default:
t.Skip("skipping test helper")
}
// For stdout/stderr, we should have crashed with a broken pipe error.
// The caller will be looking for that exit status,
// so just exit normally here to cause a failure in the caller.
// For descriptor 3, a normal exit is expected.
os.Exit(0)
}
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