golang sys_cloexec 代码
文件路径：/src/net/sys_cloexec.go
/ Copyright 2013 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.
/ This file implements sysSocket for platforms that do not provide a fast path
/ for setting SetNonblock and CloseOnExec.
/go:build aix || darwin
package net
import (
"internal/poll"
"os"
"syscall"
)
/ Wrapper around the socket system call that marks the returned file
/ descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
/ See ../syscall/exec_unix.go for description of ForkLock.
syscall.ForkLock.RLock()
s, err := socketFunc(family, sotype, proto)
if err == nil {
syscall.CloseOnExec(s)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, os.NewSyscallError("socket", err)
}
if err = syscall.SetNonblock(s, true); err != nil {
poll.CloseFunc(s)
return -1, os.NewSyscallError("setnonblock", err)
}
return s, nil
}