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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.

// +build darwin freebsd linux netbsd openbsd

package net

import (
        "os"
        "syscall"
)

func newPollServer() (s *pollServer, err error) {
        s = new(pollServer)
        s.cr = make(chan *netFD, 1)
        s.cw = make(chan *netFD, 1)
        if s.pr, s.pw, err = os.Pipe(); err != nil {
                return nil, err
        }
        if err = syscall.SetNonblock(s.pr.Fd(), true); err != nil {
                goto Errno
        }
        if err = syscall.SetNonblock(s.pw.Fd(), true); err != nil {
                goto Errno
        }
        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

Errno:
        err = &os.PathError{
                Op:   "setnonblock",
                Path: s.pr.Name(),
                Err:  err,
        }
Error:
        s.pr.Close()
        s.pw.Close()
        return nil, err
}