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package w32
import (
"fmt"
"io/ioutil"
"os"
"path"
"strconv"
"testing"
"time"
)
var forkFn = path.Join(os.TempDir(), "forktest.pid")
func TestFork(t *testing.T) {
ppid := os.Getpid()
t.Logf("[OK] I am PID %d", ppid)
pid, err := Fork()
if err != nil {
t.Fatalf("[!!] Failed to fork. PID: %d: %s", pid, err)
}
if pid == 0 {
// We can't log anything here because our stdout doesn't point
// to the same console as our parent.
//
// This process won't show up in Task Manager, and os.Getpid() won't
// work, I guess because we haven't told CSRSS we exist.
f, _ := os.Create(forkFn)
f.WriteString(fmt.Sprintf("%d", ppid))
f.Close()
} else {
t.Logf("[OK] Forked child with PID %d", pid)
t.Logf("[OK] Sleeping, then trying to read checkfile.")
time.Sleep(2 * time.Second)
raw, err := ioutil.ReadFile(forkFn)
if err != nil {
t.Fatalf("[!!] Failed to read PID checkfile: %s", err)
}
if string(raw) == strconv.Itoa(ppid) {
t.Logf("[OK] Found PID checkfile - PID matches!")
} else {
t.Errorf("[!] Child reported PID %q vs %q!", string(raw), strconv.Itoa(ppid))
}
os.Remove(forkFn)
}
}
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