1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
// +build !windows,!solaris
package reap
import (
"os"
"os/exec"
"runtime"
"sync"
"testing"
"time"
"golang.org/x/sys/unix"
)
func TestReap_IsSupported(t *testing.T) {
if !IsSupported() {
t.Fatalf("reap should be supported on %s", runtime.GOOS)
}
}
func TestReap_ReapChildren(t *testing.T) {
pids := make(PidCh, 1)
errors := make(ErrorCh, 1)
done := make(chan struct{}, 1)
var reapLock sync.RWMutex
didExit := make(chan struct{}, 1)
go func() {
ReapChildren(pids, errors, done, &reapLock)
didExit <- struct{}{}
}()
killAndCheck := func() {
cmd := exec.Command("sleep", "5")
if err := cmd.Start(); err != nil {
t.Fatalf("err: %v", err)
}
childPid := cmd.Process.Pid
if err := cmd.Process.Kill(); err != nil {
t.Fatalf("err: %v", err)
}
select {
case pid := <-pids:
if pid != childPid {
t.Fatalf("unexpected pid: %d != %d", pid, childPid)
}
case err := <-errors:
t.Fatalf("err: %v", err)
case <-time.After(1 * time.Second):
t.Fatalf("should have reaped %d", childPid)
}
}
// Kill a child process and make sure it gets detected.
killAndCheck()
// Fire off a subprocess.
cmd := exec.Command("sleep", "5")
if err := cmd.Start(); err != nil {
t.Fatalf("err: %v", err)
}
// Send a spurious SIGCHLD.
if err := unix.Kill(os.Getpid(), unix.SIGCHLD); err != nil {
t.Fatalf("err: %v", err)
}
// Make sure the reaper didn't report anything.
select {
case pid := <-pids:
t.Fatalf("unexpected pid: %d", pid)
case err := <-errors:
t.Fatalf("err: %v", err)
case <-time.After(1 * time.Second):
// Good - nothing was sent to the channels.
}
// Take the reap lock.
reapLock.RLock()
// Now kill the child subprocess.
childPid := cmd.Process.Pid
if err := cmd.Process.Kill(); err != nil {
t.Fatalf("err: %v", err)
}
// Make sure the reaper didn't report anything.
select {
case pid := <-pids:
t.Fatalf("unexpected pid: %d", pid)
case err := <-errors:
t.Fatalf("err: %v", err)
case <-time.After(1 * time.Second):
// Good - nothing was sent to the channels.
}
// Give up the reap lock.
reapLock.RUnlock()
// Make sure the reaper sees it.
select {
case pid := <-pids:
if pid != childPid {
t.Fatalf("unexpected pid: %d != %d", pid, childPid)
}
case err := <-errors:
t.Fatalf("err: %v", err)
case <-time.After(1 * time.Second):
t.Fatalf("should have reaped %d", childPid)
}
// Run a few more cycles to make sure things work.
killAndCheck()
killAndCheck()
killAndCheck()
// Shut it down.
close(done)
select {
case <-didExit:
// Good - the goroutine shut down.
case <-time.After(1 * time.Second):
t.Fatalf("should have shut down")
}
}
|
