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syscall: remove cloexecSocket fallback path

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Support for Linux kernel versions requiring the fallback to CloseOnExec
was dropped from recent Go versions. The minimum Linux kernel version is
2.6.32 as of Go 1.18. The SOCK_CLOEXEC flag for the socket syscall is
supported since kernel version 2.6.27.

Follows a similar change for net.sysSocket in CL 403634.

For #45964

Change-Id: I8b6311f07c4ed7900a9af3ecb2e146c49db08665
Reviewed-on: https://go-review.googlesource.com/c/go/+/422374
Reviewed-by: Joedian Reid <joedian@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
This commit is contained in:
Tobias Klauser 2022-08-10 11:37:22 +02:00 committed by Gopher Robot
parent 5729419420
commit fe196a064e
3 changed files with 2 additions and 31 deletions
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2
src/syscall/lsf_linux.go
View File

@ -48,7 +48,7 @@ type iflags struct {
// Deprecated: Use golang.org/x/net/bpf instead.
func SetLsfPromisc(name string, m bool) error {
s, e := cloexecSocket(AF_INET, SOCK_DGRAM, 0)
s, e := Socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0)
if e != nil {
return e
}

2
src/syscall/netlink_linux.go
View File

@ -50,7 +50,7 @@ func newNetlinkRouteRequest(proto, seq, family int) []byte {
// NetlinkRIB returns routing information base, as known as RIB, which
// consists of network facility information, states and parameters.
func NetlinkRIB(proto, family int) ([]byte, error) {
s, err := cloexecSocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)
s, err := Socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_ROUTE)
if err != nil {
return nil, err
}

29
src/syscall/sock_cloexec_linux.go
View File

@ -1,29 +0,0 @@
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
// This is a stripped down version of sysSocket from net/sock_cloexec.go.
func cloexecSocket(family, sotype, proto int) (int, error) {
s, err := Socket(family, sotype|SOCK_CLOEXEC, proto)
switch err {
case nil:
return s, nil
default:
return -1, err
case EINVAL:
}
ForkLock.RLock()
s, err = Socket(family, sotype, proto)
if err == nil {
CloseOnExec(s)
}
ForkLock.RUnlock()
if err != nil {
Close(s)
return -1, err
}
return s, nil
}