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Source file src/internal/poll/sys_cloexec.go

Documentation: internal/poll

  // 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 do not
  // provide a fast path for setting SetNonblock and CloseOnExec.
  
  // +build darwin nacl netbsd openbsd solaris
  
  package poll
  
  import (
  	"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) {
  	// 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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