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// Copyright 2010 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.
package net
import (
"os"
"syscall"
)
func selfConnectedTCPSocket() (pr, pw *os.File, err error) {
// See ../syscall/exec.go for description of ForkLock.
syscall.ForkLock.RLock()
sockfd, e := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
if e != 0 {
syscall.ForkLock.RUnlock()
return nil, nil, os.Errno(e)
}
syscall.CloseOnExec(sockfd)
syscall.ForkLock.RUnlock()
// Allow reuse of recently-used addresses.
syscall.SetsockoptInt(sockfd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
var laTCP *TCPAddr
var la syscall.Sockaddr
if laTCP, err = ResolveTCPAddr("127.0.0.1:0"); err != nil {
Error:
return nil, nil, err
}
if la, err = laTCP.sockaddr(syscall.AF_INET); err != nil {
goto Error
}
e = syscall.Bind(sockfd, la)
if e != 0 {
Errno:
syscall.Close(sockfd)
return nil, nil, os.Errno(e)
}
laddr, _ := syscall.Getsockname(sockfd)
e = syscall.Connect(sockfd, laddr)
if e != 0 {
goto Errno
}
fd := os.NewFile(sockfd, "wakeupSocket")
return fd, fd, nil
}
func newPollServer() (s *pollServer, err error) {
s = new(pollServer)
s.cr = make(chan *netFD, 1)
s.cw = make(chan *netFD, 1)
// s.pr and s.pw are indistinguishable.
if s.pr, s.pw, err = selfConnectedTCPSocket(); err != nil {
return nil, err
}
var e int
if e = syscall.SetNonblock(s.pr.Fd(), true); e != 0 {
Errno:
err = &os.PathError{"setnonblock", s.pr.Name(), os.Errno(e)}
Error:
s.pr.Close()
return nil, err
}
if s.poll, err = newpollster(); err != nil {
goto Error
}
if _, err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
s.poll.Close()
goto Error
}
s.pending = make(map[int]*netFD)
go s.Run()
return s, nil
}
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