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unix: avoid setting O_NONBLOCK needlessly by checking flags beforehand

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Change-Id: I227118221df469a677f3ff140ca7b94acb7f9571
Reviewed-on: https://go-review.googlesource.com/c/sys/+/517576
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Andy Pan <panjf2000@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Andy Pan
2023-08-10 14:36:31 +00:00
committed by Gopher Robot
parent ee578879d8
commit 552c4e8192
1 changed files with 3 additions and 0 deletions
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unix/syscall_unix.go
+3
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@@ -549,6 +549,9 @@ func SetNonblock(fd int, nonblocking bool) (err error) {
if err != nil { if err != nil {
return err return err
} }
if (flag&O_NONBLOCK != 0) == nonblocking {
return nil
}
if nonblocking { if nonblocking {
flag |= O_NONBLOCK flag |= O_NONBLOCK
} else { } else {