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// Copyright 2024 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, but don't necessarily have accept4.
// The accept4(3c) function was added to Oracle Solaris in the Solaris 11.4.0
// release. Thus, on releases prior to 11.4, we fall back to the combination
// of accept(3c) and fcntl(2).
package poll
import (
"internal/syscall/unix"
"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) {
// Perform a cheap test and try the fast path first.
if unix.SupportAccept4() {
ns, sa, err := Accept4Func(s, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
if err != nil {
return -1, nil, "accept4", err
}
return ns, sa, "", nil
}
// 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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