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- // 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 sysSocket for platforms that provide a fast path for
- // setting SetNonblock and CloseOnExec.
- //go:build dragonfly || freebsd || hurd || illumos || linux || netbsd || openbsd
- package net
- import (
- "internal/poll"
- "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) {
- s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
- // On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
- // introduced in 2.6.27 kernel and on FreeBSD both flags were
- // introduced in 10 kernel. If we get an EINVAL error on Linux
- // or EPROTONOSUPPORT error on FreeBSD, fall back to using
- // socket without them.
- switch err {
- case nil:
- return s, nil
- default:
- return -1, os.NewSyscallError("socket", err)
- case syscall.EPROTONOSUPPORT, syscall.EINVAL:
- }
- // 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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