1 // Copyright 2013 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4 5 // This file implements accept for platforms that do not provide a fast path for
6 // setting SetNonblock and CloseOnExec.
7 8 //go:build aix || darwin || (js && wasm) || wasip1
9 10 package poll
11 12 import (
13 "syscall"
14 )
15 16 // Wrapper around the accept system call that marks the returned file
17 // descriptor as nonblocking and close-on-exec.
18 func accept(s int) (int, syscall.Sockaddr, []byte, error) {
19 // See ../syscall/exec_unix.go for description of ForkLock.
20 // It is probably okay to hold the lock across syscall.Accept
21 // because we have put fd.sysfd into non-blocking mode.
22 // However, a call to the File method will put it back into
23 // blocking mode. We can't take that risk, so no use of ForkLock here.
24 ns, sa, err := AcceptFunc(s)
25 if err == nil {
26 syscall.CloseOnExec(ns)
27 }
28 if err != nil {
29 return -1, nil, "accept", err
30 }
31 if err = syscall.SetNonblock(ns, true); err != nil {
32 CloseFunc(ns)
33 return -1, nil, "setnonblock", err
34 }
35 return ns, sa, "", nil
36 }
37