golang sys_cloexec 代码
文件路径：/src/internal/poll/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 accept for platforms that do not provide a fast path for
/ setting SetNonblock and CloseOnExec.
/go:build aix || darwin || (js && wasm)
package poll
import (
"syscall"
)
/ Wrapper around the accept system call that marks the returned file
/ descriptor as nonblocking and close-on-exec.
func accept(s int) (int, syscall.Sockaddr, string, error) {
/ See ../syscall/exec_unix.go for description of ForkLock.
/ It is probably okay to hold the lock across syscall.Accept
/ because we have put fd.sysfd into non-blocking mode.
/ However, a call to the File method will put it back into
/ blocking mode. We can't take that risk, so no use of ForkLock here.
ns, sa, err := AcceptFunc(s)
if err == nil {
syscall.CloseOnExec(ns)
}
if err != nil {
return -1, nil, "accept", err
}
if err = syscall.SetNonblock(ns, true); err != nil {
CloseFunc(ns)
return -1, nil, "setnonblock", err
}
return ns, sa, "", nil
}