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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.
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
package syscall_test
import (
"internal/testenv"
"io"
"os"
"os/exec"
"os/signal"
"syscall"
"testing"
"unsafe"
)
type command struct {
pipe io.WriteCloser
proc *exec.Cmd
test *testing.T
}
func (c *command) Info() (pid, pgrp int) {
pid = c.proc.Process.Pid
pgrp, err := syscall.Getpgid(pid)
if err != nil {
c.test.Fatal(err)
}
return
}
func (c *command) Start() {
if err := c.proc.Start(); err != nil {
c.test.Fatal(err)
}
}
func (c *command) Stop() {
c.pipe.Close()
if err := c.proc.Wait(); err != nil {
c.test.Fatal(err)
}
}
func create(t *testing.T) *command {
testenv.MustHaveExec(t)
proc := exec.Command("cat")
stdin, err := proc.StdinPipe()
if err != nil {
t.Fatal(err)
}
return &command{stdin, proc, t}
}
func parent() (pid, pgrp int) {
return syscall.Getpid(), syscall.Getpgrp()
}
func TestZeroSysProcAttr(t *testing.T) {
ppid, ppgrp := parent()
cmd := create(t)
cmd.Start()
defer cmd.Stop()
cpid, cpgrp := cmd.Info()
if cpid == ppid {
t.Fatalf("Parent and child have the same process ID")
}
if cpgrp != ppgrp {
t.Fatalf("Child is not in parent's process group")
}
}
func TestSetpgid(t *testing.T) {
ppid, ppgrp := parent()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
cmd.Start()
defer cmd.Stop()
cpid, cpgrp := cmd.Info()
if cpid == ppid {
t.Fatalf("Parent and child have the same process ID")
}
if cpgrp == ppgrp {
t.Fatalf("Parent and child are in the same process group")
}
if cpid != cpgrp {
t.Fatalf("Child's process group is not the child's process ID")
}
}
func TestPgid(t *testing.T) {
ppid, ppgrp := parent()
cmd1 := create(t)
cmd1.proc.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
cmd1.Start()
defer cmd1.Stop()
cpid1, cpgrp1 := cmd1.Info()
if cpid1 == ppid {
t.Fatalf("Parent and child 1 have the same process ID")
}
if cpgrp1 == ppgrp {
t.Fatalf("Parent and child 1 are in the same process group")
}
if cpid1 != cpgrp1 {
t.Fatalf("Child 1's process group is not its process ID")
}
cmd2 := create(t)
cmd2.proc.SysProcAttr = &syscall.SysProcAttr{
Setpgid: true,
Pgid: cpgrp1,
}
cmd2.Start()
defer cmd2.Stop()
cpid2, cpgrp2 := cmd2.Info()
if cpid2 == ppid {
t.Fatalf("Parent and child 2 have the same process ID")
}
if cpgrp2 == ppgrp {
t.Fatalf("Parent and child 2 are in the same process group")
}
if cpid2 == cpgrp2 {
t.Fatalf("Child 2's process group is its process ID")
}
if cpid1 == cpid2 {
t.Fatalf("Child 1 and 2 have the same process ID")
}
if cpgrp1 != cpgrp2 {
t.Fatalf("Child 1 and 2 are not in the same process group")
}
}
func TestForeground(t *testing.T) {
signal.Ignore(syscall.SIGTTIN, syscall.SIGTTOU)
tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
if err != nil {
t.Skipf("Can't test Foreground. Couldn't open /dev/tty: %s", err)
}
fpgrp := 0
errno := syscall.Ioctl(tty.Fd(), syscall.TIOCGPGRP, uintptr(unsafe.Pointer(&fpgrp)))
if errno != 0 {
t.Fatalf("TIOCGPGRP failed with error code: %s", errno)
}
if fpgrp == 0 {
t.Fatalf("Foreground process group is zero")
}
ppid, ppgrp := parent()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{
Ctty: int(tty.Fd()),
Foreground: true,
}
cmd.Start()
cpid, cpgrp := cmd.Info()
if cpid == ppid {
t.Fatalf("Parent and child have the same process ID")
}
if cpgrp == ppgrp {
t.Fatalf("Parent and child are in the same process group")
}
if cpid != cpgrp {
t.Fatalf("Child's process group is not the child's process ID")
}
cmd.Stop()
errno = syscall.Ioctl(tty.Fd(), syscall.TIOCSPGRP, uintptr(unsafe.Pointer(&fpgrp)))
if errno != 0 {
t.Fatalf("TIOCSPGRP failed with error code: %s", errno)
}
signal.Reset()
}
// Test a couple of cases that SysProcAttr can't handle. Issue 29458.
func TestInvalidExec(t *testing.T) {
t.Parallel()
t.Run("SetCtty-Foreground", func(t *testing.T) {
t.Parallel()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{
Setctty: true,
Foreground: true,
Ctty: 0,
}
if err := cmd.proc.Start(); err == nil {
t.Error("expected error setting both SetCtty and Foreground")
}
})
t.Run("invalid-Ctty", func(t *testing.T) {
t.Parallel()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{
Setctty: true,
Ctty: 3,
}
if err := cmd.proc.Start(); err == nil {
t.Error("expected error with invalid Ctty value")
}
})
}
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