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
10package poll
11
12import (
13	"syscall"
14)
15
16// Wrapper around the accept system call that marks the returned file
17// descriptor as nonblocking and close-on-exec.
18func accept(s int) (int, syscall.Sockaddr, string, 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