go sys_cloexec 源码
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
}
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