libgo/go/internal/poll/sys_cloexec.go

   1 // Copyright 2013 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // This file implements sysSocket and accept for platforms that do not
   6 // provide a fast path for setting SetNonblock and CloseOnExec.
   7
   8 // +build darwin nacl netbsd openbsd solaris
   9
  10 package poll
  11
  12 import (
  13         "syscall"
  14 )
  15
  16 // Wrapper around the accept system call that marks the returned file
  17 // descriptor as nonblocking and close-on-exec.
  18 func accept(s int) (int, syscall.Sockaddr, string, error) {
  19         // See ../syscall/exec_unix.go for description of ForkLock.
  20         // It is probably okay to hold the lock across syscall.Accept
  21         // because we have put fd.sysfd into non-blocking mode.
  22         // However, a call to the File method will put it back into
  23         // blocking mode. We can't take that risk, so no use of ForkLock here.
  24         ns, sa, err := AcceptFunc(s)
  25         if err == nil {
  26                 syscall.CloseOnExec(ns)
  27         }
  28         if err != nil {
  29                 return -1, nil, "accept", err
  30         }
  31         if err = syscall.SetNonblock(ns, true); err != nil {
  32                 CloseFunc(ns)
  33                 return -1, nil, "setnonblock", err
  34         }
  35         return ns, sa, "", nil
  36 }