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unix: implement Waitid on Linux

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waitid(2) can be used to wait on pidfds. Update TestPidfd to test this new
functionality as well.

Change-Id: I5f26140b9afd5a6ec3f04217fb1c91542936a2c3
Reviewed-on: https://go-review.googlesource.com/c/sys/+/395936
Trust: Matt Layher <mdlayher@gmail.com>
Run-TryBot: Matt Layher <mdlayher@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
This commit is contained in:
Matt Layher
2022-03-25 20:38:50 +00:00
parent 594fa53f00
commit 36772127a2
5 changed files with 26 additions and 1 deletions
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unix/syscall_linux_test.go
+9
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@@ -238,6 +238,11 @@ func TestPidfd(t *testing.T) {
}
defer unix.Close(fd)
// Child is running but not terminated.
if err := unix.Waitid(unix.P_PIDFD, fd, nil, unix.WEXITED|unix.WNOHANG, nil); err != nil {
t.Fatalf("failed to check for child exit: %v", err)
}
const want = unix.SIGHUP
if err := unix.PidfdSendSignal(fd, want, nil, 0); err != nil {
t.Fatalf("failed to signal child process: %v", err)
@@ -249,6 +254,10 @@ func TestPidfd(t *testing.T) {
t.Fatalf("child process terminated but did not return an exit error: %v", err)
}
if err := unix.Waitid(unix.P_PIDFD, fd, nil, unix.WEXITED, nil); !errors.Is(err, unix.ECHILD) {
t.Fatalf("expected ECHILD for final waitid, but got: %v", err)
}
ws, ok := eerr.Sys().(syscall.WaitStatus)
if !ok {
t.Fatalf("expected syscall.WaitStatus value, but got: %#T", eerr.Sys())