79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"os"
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"syscall"
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)
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func selfConnectedTCPSocket() (pr, pw *os.File, err error) {
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// See ../syscall/exec.go for description of ForkLock.
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syscall.ForkLock.RLock()
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sockfd, e := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
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if e != 0 {
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syscall.ForkLock.RUnlock()
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return nil, nil, os.Errno(e)
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}
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syscall.CloseOnExec(sockfd)
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syscall.ForkLock.RUnlock()
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// Allow reuse of recently-used addresses.
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syscall.SetsockoptInt(sockfd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
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var laTCP *TCPAddr
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var la syscall.Sockaddr
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if laTCP, err = ResolveTCPAddr("127.0.0.1:0"); err != nil {
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Error:
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return nil, nil, err
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}
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if la, err = laTCP.sockaddr(syscall.AF_INET); err != nil {
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goto Error
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}
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e = syscall.Bind(sockfd, la)
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if e != 0 {
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Errno:
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syscall.Close(sockfd)
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return nil, nil, os.Errno(e)
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}
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laddr, _ := syscall.Getsockname(sockfd)
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e = syscall.Connect(sockfd, laddr)
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if e != 0 {
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goto Errno
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}
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fd := os.NewFile(sockfd, "wakeupSocket")
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return fd, fd, nil
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}
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func newPollServer() (s *pollServer, err error) {
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s = new(pollServer)
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s.cr = make(chan *netFD, 1)
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s.cw = make(chan *netFD, 1)
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// s.pr and s.pw are indistinguishable.
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if s.pr, s.pw, err = selfConnectedTCPSocket(); err != nil {
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return nil, err
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}
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var e int
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if e = syscall.SetNonblock(s.pr.Fd(), true); e != 0 {
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Errno:
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err = &os.PathError{"setnonblock", s.pr.Name(), os.Errno(e)}
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Error:
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s.pr.Close()
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return nil, err
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}
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if s.poll, err = newpollster(); err != nil {
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goto Error
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}
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if _, err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
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s.poll.Close()
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goto Error
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}
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s.pending = make(map[int]*netFD)
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go s.Run()
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return s, nil
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}
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