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net: pass MSG_CMSG_CLOEXEC in ReadMsgUnix on dragonfly, netbsd and openbsd

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Add support for passing MSG_CMSG_CLOEXEC to the recvmsg syscall on
dragonfly, netbsd and openbsd. MSG_CMSG_CLOEXEC on freebsd is currently
broken, see https://reviews.freebsd.org/D29328.

Change-Id: Ie4c6e3cb550cd0ae32a1c2acca12edf77569e96a
Reviewed-on: https://go-review.googlesource.com/c/go/+/311570
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tobias Klauser 2021-04-20 10:25:19 +02:00 committed by Tobias Klauser
parent 3f8e64878a
commit 57b0d838ed
7 changed files with 12 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/net/unixsock_posix.go
View file

@ -114,7 +114,7 @@ func (c *UnixConn) readFrom(b []byte) (int, *UnixAddr, error) {
func (c *UnixConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *UnixAddr, err error) {
var sa syscall.Sockaddr
n, oobn, flags, sa, err = c.fd.readMsg(b, oob, readMsgFlags)
if oobn > 0 {
if readMsgFlags == 0 && err == nil && oobn > 0 {
setReadMsgCloseOnExec(oob[:oobn])
}

8
src/net/unixsock_readmsg_posix.go → src/net/unixsock_readmsg_cloexec.go
View file

@ -2,14 +2,12 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd || solaris
// +build aix darwin dragonfly freebsd netbsd openbsd solaris
//go:build aix || darwin || freebsd || solaris
// +build aix darwin freebsd solaris
package net
import (
"syscall"
)
import "syscall"
const readMsgFlags = 0

11
src/net/unixsock_readmsg_linux.go → src/net/unixsock_readmsg_cmsg_cloexec.go
View file

@ -2,16 +2,13 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux
// +build linux
//go:build dragonfly || linux || netbsd || openbsd
// +build dragonfly linux netbsd openbsd
package net
import (
"syscall"
)
import "syscall"
const readMsgFlags = syscall.MSG_CMSG_CLOEXEC
func setReadMsgCloseOnExec(oob []byte) {
}
func setReadMsgCloseOnExec(oob []byte) {}

3
src/net/unixsock_readmsg_other.go
View file

@ -9,5 +9,4 @@ package net
const readMsgFlags = 0
func setReadMsgCloseOnExec(oob []byte) {
}
func setReadMsgCloseOnExec(oob []byte) {}

1
src/syscall/zerrors_dragonfly_amd64.go
View file

@ -850,6 +850,7 @@ const (
MAP_VPAGETABLE = 0x2000
MCL_CURRENT = 0x1
MCL_FUTURE = 0x2
MSG_CMSG_CLOEXEC = 0x1000
MSG_CTRUNC = 0x20
MSG_DONTROUTE = 0x4
MSG_DONTWAIT = 0x80

1
src/syscall/zerrors_openbsd_386.go
View file

@ -891,6 +891,7 @@ const (
MCL_CURRENT = 0x1
MCL_FUTURE = 0x2
MSG_BCAST = 0x100
MSG_CMSG_CLOEXEC = 0x800
MSG_CTRUNC = 0x20
MSG_DONTROUTE = 0x4
MSG_DONTWAIT = 0x80

1
src/syscall/zerrors_openbsd_amd64.go
View file

@ -891,6 +891,7 @@ const (
MCL_CURRENT = 0x1
MCL_FUTURE = 0x2
MSG_BCAST = 0x100
MSG_CMSG_CLOEXEC = 0x800
MSG_CTRUNC = 0x20
MSG_DONTROUTE = 0x4
MSG_DONTWAIT = 0x80