github.com/axw/llgo@v0.0.0-20160805011314-95b5fe4dca20/third_party/gofrontend/libgo/go/net/newpollserver_rtems.go (about)

     1  // Copyright 2010 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  package net
     6  
     7  import (
     8  	"os"
     9  	"syscall"
    10  )
    11  
    12  func selfConnectedTCPSocket() (pr, pw *os.File, err error) {
    13  	// See ../syscall/exec.go for description of ForkLock.
    14  	syscall.ForkLock.RLock()
    15  	sockfd, e := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
    16  	if e != 0 {
    17  		syscall.ForkLock.RUnlock()
    18  		return nil, nil, os.Errno(e)
    19  	}
    20  	syscall.CloseOnExec(sockfd)
    21  	syscall.ForkLock.RUnlock()
    22  
    23  	// Allow reuse of recently-used addresses.
    24  	syscall.SetsockoptInt(sockfd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
    25  
    26  	var laTCP *TCPAddr
    27  	var la syscall.Sockaddr
    28  	if laTCP, err = ResolveTCPAddr("127.0.0.1:0"); err != nil {
    29  	Error:
    30  		return nil, nil, err
    31  	}
    32  	if la, err = laTCP.sockaddr(syscall.AF_INET); err != nil {
    33  		goto Error
    34  	}
    35  	e = syscall.Bind(sockfd, la)
    36  	if e != 0 {
    37  	Errno:
    38  		syscall.Close(sockfd)
    39  		return nil, nil, os.Errno(e)
    40  	}
    41  
    42  	laddr, _ := syscall.Getsockname(sockfd)
    43  	e = syscall.Connect(sockfd, laddr)
    44  	if e != 0 {
    45  		goto Errno
    46  	}
    47  
    48  	fd := os.NewFile(sockfd, "wakeupSocket")
    49  	return fd, fd, nil
    50  }
    51  
    52  func newPollServer() (s *pollServer, err error) {
    53  	s = new(pollServer)
    54  	s.cr = make(chan *netFD, 1)
    55  	s.cw = make(chan *netFD, 1)
    56  	// s.pr and s.pw are indistinguishable.
    57  	if s.pr, s.pw, err = selfConnectedTCPSocket(); err != nil {
    58  		return nil, err
    59  	}
    60  	var e int
    61  	if e = syscall.SetNonblock(s.pr.Fd(), true); e != 0 {
    62  	Errno:
    63  		err = &os.PathError{"setnonblock", s.pr.Name(), os.Errno(e)}
    64  	Error:
    65  		s.pr.Close()
    66  		return nil, err
    67  	}
    68  	if s.poll, err = newpollster(); err != nil {
    69  		goto Error
    70  	}
    71  	if _, err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
    72  		s.poll.Close()
    73  		goto Error
    74  	}
    75  	s.pending = make(map[int]*netFD)
    76  	go s.Run()
    77  	return s, nil
    78  }