// 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 provide a fast path for
// setting SetNonblock and CloseOnExec.

//go:build dragonfly || freebsd || (linux && !arm) || netbsd || openbsd || solaris

package poll

import 

// Wrapper around the accept system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func ( int) (int, syscall.Sockaddr, string, error) {
	, ,  := Accept4Func(, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
	// TODO: We can remove the fallback on Linux and *BSD,
	// as currently supported versions all support accept4
	// with SOCK_CLOEXEC, but Solaris does not. See issue #59359.
	switch  {
	case nil:
		return , , "", nil
	default: // errors other than the ones listed
		return -1, , "accept4", 
	case syscall.ENOSYS: // syscall missing
	case syscall.EINVAL: // some Linux use this instead of ENOSYS
	case syscall.EACCES: // some Linux use this instead of ENOSYS
	case syscall.EFAULT: // some Linux use this instead of ENOSYS
	}

	// 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.
	, ,  = AcceptFunc()
	if  == nil {
		syscall.CloseOnExec()
	}
	if  != nil {
		return -1, nil, "accept", 
	}
	if  = syscall.SetNonblock(, true);  != nil {
		CloseFunc()
		return -1, nil, "setnonblock", 
	}
	return , , "", nil
}