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unix: add PrctlRetInt, a Prctl variant that returns (int, error)

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Fixes golang/go#35978

Change-Id: I396f0c2c6443e000bcecc9081841cd55145c050b
GitHub-Last-Rev: d461448006fb6d35b1942177e1d006d67fd2b8b5
GitHub-Pull-Request: golang/sys#48
Reviewed-on: https://go-review.googlesource.com/c/sys/+/209969
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
This commit is contained in:
Umang Parmar
2019-12-18 08:49:08 +00:00
committed by Tobias Klauser
parent ac6580df44
commit 4a24b40652
2 changed files with 25 additions and 0 deletions
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unix/syscall_linux_test.go
+14
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@@ -686,3 +686,17 @@ func TestEpoll(t *testing.T) {
t.Errorf("EpollWait: wrong Fd in event: got %v, expected %v", got, fd)
}
}
func TestPrctlRetInt(t *testing.T) {
err := unix.Prctl(unix.PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)
if err != nil {
t.Skipf("Prctl: %v, skipping test", err)
}
v, err := unix.PrctlRetInt(unix.PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0)
if err != nil {
t.Fatalf("failed to perform prctl: %v", err)
}
if v != 1 {
t.Fatalf("unexpected return from prctl; got %v, expected %v", v, 1)
}
}