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net: update SOCK_CLOEXEC comment

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For #45964
For #59359

Change-Id: I7fd295a096e5776102e057789d157da681df9073
Reviewed-on: https://go-review.googlesource.com/c/go/+/501939
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2023-06-08 17:21:56 -07:00 committed by Gopher Robot
parent bd00528d04
commit 19b814b80b
1 changed files with 3 additions and 5 deletions
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8
src/net/sock_cloexec.go
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@ -19,11 +19,9 @@ import (
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
// On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
// introduced in 2.6.27 kernel and on FreeBSD both flags were
// introduced in 10 kernel. If we get an EINVAL error on Linux
// or EPROTONOSUPPORT error on FreeBSD, fall back to using
// socket without them.
// TODO: We can remove the fallback on Linux and *BSD,
// as currently supported versions all support accept4
// with SOCK_CLOEXEC, but Solaris does not. See issue #59359.
switch err {
case nil:
return s, nil