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Source file src/net/sock_cloexec.go

Documentation: net

  // 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 and accept for platforms that
  // provide a fast path for setting SetNonblock and CloseOnExec.
  
  // +build dragonfly freebsd linux
  
  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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