1// Copyright 2020 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5//go:build unix
6
7package os_test
8
9import (
10	"errors"
11	"internal/testenv"
12	"math"
13	. "os"
14	"runtime"
15	"syscall"
16	"testing"
17)
18
19func TestErrProcessDone(t *testing.T) {
20	testenv.MustHaveGoBuild(t)
21	t.Parallel()
22
23	p, err := StartProcess(testenv.GoToolPath(t), []string{"go"}, &ProcAttr{})
24	if err != nil {
25		t.Fatalf("starting test process: %v", err)
26	}
27	p.Wait()
28	if got := p.Signal(Kill); got != ErrProcessDone {
29		t.Errorf("got %v want %v", got, ErrProcessDone)
30	}
31}
32
33// Lookup of a process that does not exist at time of lookup.
34func TestProcessAlreadyDone(t *testing.T) {
35	// Theoretically MaxInt32 is a valid PID, but the chance of it actually
36	// being used is extremely unlikely.
37	pid := math.MaxInt32
38	if runtime.GOOS == "solaris" || runtime.GOOS == "illumos" {
39		// Solaris/Illumos have a lower limit, above which wait returns
40		// EINVAL (see waitid in usr/src/uts/common/os/exit.c in
41		// illumos). This is configurable via sysconf(_SC_MAXPID), but
42		// we'll just take the default.
43		pid = 30000 - 1
44	}
45
46	p, err := FindProcess(pid)
47	if err != nil {
48		t.Fatalf("FindProcess(math.MaxInt32) got err %v, want nil", err)
49	}
50
51	if ps, err := p.Wait(); !errors.Is(err, syscall.ECHILD) {
52		t.Errorf("Wait() got err %v (ps %+v), want %v", err, ps, syscall.ECHILD)
53	}
54
55	if err := p.Release(); err != nil {
56		t.Errorf("Release() got err %v, want nil", err)
57	}
58}
59
60func TestUNIXProcessAlive(t *testing.T) {
61	testenv.MustHaveGoBuild(t)
62	t.Parallel()
63
64	p, err := StartProcess(testenv.GoToolPath(t), []string{"sleep", "1"}, &ProcAttr{})
65	if err != nil {
66		t.Skipf("starting test process: %v", err)
67	}
68	defer p.Kill()
69
70	proc, err := FindProcess(p.Pid)
71	if err != nil {
72		t.Errorf("OS reported error for running process: %v", err)
73	}
74	err = proc.Signal(syscall.Signal(0))
75	if err != nil {
76		t.Errorf("OS reported error for running process: %v", err)
77	}
78}
79
80func TestProcessBadPID(t *testing.T) {
81	p, err := FindProcess(-1)
82	if err != nil {
83		t.Fatalf("unexpected FindProcess error: %v", err)
84	}
85	err = p.Signal(syscall.Signal(0))
86	if err == nil {
87		t.Error("p.Signal succeeded unexpectedly")
88	}
89}
90