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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 sysSocket for platforms that provide a fast path for
// setting SetNonblock and CloseOnExec, but don't necessarily support it.
// Support for SOCK_* flags as part of the type parameter was added to Oracle
// Solaris in the 11.4 release. Thus, on releases prior to 11.4, we fall back
// to the combination of socket(3c) and fcntl(2).
package net
import (
"internal/poll"
"internal/syscall/unix"
"os"
"syscall"
)
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
// Perform a cheap test and try the fast path first.
if unix.SupportSockNonblockCloexec() {
s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
if err != nil {
return -1, os.NewSyscallError("socket", err)
}
return s, nil
}
// See ../syscall/exec_unix.go for description of ForkLock.
syscall.ForkLock.RLock()
s, err := socketFunc(family, sotype, proto)
if err == nil {
syscall.CloseOnExec(s)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, os.NewSyscallError("socket", err)
}
if err = syscall.SetNonblock(s, true); err != nil {
poll.CloseFunc(s)
return -1, os.NewSyscallError("setnonblock", err)
}
return s, nil
}
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