mirror of https://github.com/tidwall/evio.git
506 lines
9.7 KiB
Go
506 lines
9.7 KiB
Go
// Copyright 2017 Joshua J Baker. All rights reserved.
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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// +build netbsd openbsd freebsd darwin dragonfly linux
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package evio
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import (
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"errors"
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"net"
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"os"
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"sort"
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"strconv"
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"sync"
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"syscall"
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"time"
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"github.com/tidwall/evio/internal"
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)
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func (ln *listener) close() {
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if ln.fd != 0 {
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syscall.Close(ln.fd)
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}
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if ln.f != nil {
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ln.f.Close()
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}
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if ln.ln != nil {
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ln.ln.Close()
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}
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if ln.network == "unix" {
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os.RemoveAll(ln.addr)
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}
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}
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func (ln *listener) system() error {
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var err error
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switch netln := ln.ln.(type) {
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default:
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ln.close()
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return errors.New("network not supported")
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case *net.TCPListener:
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ln.f, err = netln.File()
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case *net.UnixListener:
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ln.f, err = netln.File()
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}
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if err != nil {
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ln.close()
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return err
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}
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ln.fd = int(ln.f.Fd())
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return syscall.SetNonblock(ln.fd, true)
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}
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type unixConn struct {
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id, fd, p int
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outbuf []byte
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outpos int
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action Action
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opts Options
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raddr net.Addr
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laddr net.Addr
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err error
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wake bool
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writeon bool
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detached bool
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attaching bool
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closed bool
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}
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func (c *unixConn) Read(p []byte) (n int, err error) {
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return syscall.Read(c.fd, p)
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}
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func (c *unixConn) Write(p []byte) (n int, err error) {
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if c.detached {
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if len(c.outbuf) > 0 {
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for len(c.outbuf) > 0 {
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n, err = syscall.Write(c.fd, c.outbuf)
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if n > 0 {
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c.outbuf = c.outbuf[n:]
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}
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if err != nil {
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return 0, err
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}
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}
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c.outbuf = nil
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}
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var tn int
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if len(p) > 0 {
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for len(p) > 0 {
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n, err = syscall.Write(c.fd, p)
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if n > 0 {
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p = p[n:]
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tn += n
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}
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if err != nil {
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return tn, err
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}
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}
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p = nil
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}
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return tn, nil
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}
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return syscall.Write(c.fd, p)
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}
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func (c *unixConn) Close() error {
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if c.closed {
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return syscall.EINVAL
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}
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err := syscall.Close(c.fd)
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c.fd = -1
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c.closed = true
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return err
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}
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func serve(events Events, lns []*listener) error {
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p, err := internal.MakePoll()
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if err != nil {
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return err
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}
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defer syscall.Close(p)
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for _, ln := range lns {
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if err := internal.AddRead(p, ln.fd); err != nil {
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return err
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}
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}
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var mu sync.Mutex
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lock := func() { mu.Lock() }
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unlock := func() { mu.Unlock() }
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fdconn := make(map[int]*unixConn)
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idconn := make(map[int]*unixConn)
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var id int
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ctx := Context{
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Wake: func(id int) bool {
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var ok = true
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var err error
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lock()
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c := idconn[id]
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if c == nil {
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ok = false
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} else if !c.wake {
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c.wake = true
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err = internal.AddWrite(c.p, c.fd, &c.writeon)
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}
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unlock()
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if err != nil {
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panic(err)
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}
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return ok
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},
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Attach: func(v interface{}) error {
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var fd int
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var err error
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switch v := v.(type) {
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default:
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return errors.New("invalid type")
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case *net.TCPConn:
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f, err := v.File()
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if err != nil {
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return err
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}
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fd = int(f.Fd())
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case *net.UnixConn:
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f, err := v.File()
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if err != nil {
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return err
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}
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fd = int(f.Fd())
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case *os.File:
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fd = int(v.Fd())
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case int:
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fd = v
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case uintptr:
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fd = int(v)
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}
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err = syscall.SetNonblock(fd, true)
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if err != nil {
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println(456)
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return err
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}
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lock()
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err = internal.AddRead(p, fd)
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if err != nil {
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unlock()
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return err
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}
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id++
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c := &unixConn{id: id, fd: fd, p: p}
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c.attaching = true
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fdconn[fd] = c
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idconn[id] = c
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if events.Attached != nil {
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unlock()
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out, opts, action := events.Attached(id, v)
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lock()
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if opts.TCPKeepAlive > 0 {
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internal.SetKeepAlive(fd, int(c.opts.TCPKeepAlive/time.Second))
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}
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c.action = action
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if len(out) > 0 {
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c.outbuf = append(c.outbuf, out...)
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}
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}
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// if len(c.outbuf) > 0 || c.action != None {
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err = internal.AddWrite(p, fd, &c.writeon)
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if err != nil {
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unlock()
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panic(err)
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}
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// }
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unlock()
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// println("---")
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return nil
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},
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}
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ctx.Addrs = make([]net.Addr, len(lns))
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for i, ln := range lns {
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ctx.Addrs[i] = ln.naddr
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}
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if events.Serving != nil {
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switch events.Serving(ctx) {
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case Shutdown:
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return nil
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}
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}
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defer func() {
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lock()
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type fdid struct {
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fd, id int
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opts Options
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}
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var fdids []fdid
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for fd, c := range fdconn {
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fdids = append(fdids, fdid{fd, c.id, c.opts})
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}
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sort.Slice(fdids, func(i, j int) bool {
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return fdids[j].id < fdids[i].id
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})
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for _, fdid := range fdids {
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syscall.Close(fdid.fd)
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if events.Closed != nil {
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unlock()
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events.Closed(fdid.id, nil)
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lock()
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}
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}
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unlock()
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}()
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var packet [0xFFFF]byte
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var evs = internal.MakeEvents(64)
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var lastTicker time.Time
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var tickerDelay time.Duration
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if events.Tick == nil {
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tickerDelay = time.Hour
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}
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for {
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pn, err := internal.Wait(p, evs, tickerDelay)
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if err != nil && err != syscall.EINTR {
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return err
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}
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if events.Tick != nil {
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now := time.Now()
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if now.Sub(lastTicker) > tickerDelay {
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var action Action
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tickerDelay, action = events.Tick()
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if action == Shutdown {
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return nil
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}
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lastTicker = now
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}
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}
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lock()
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for i := 0; i < pn; i++ {
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var in []byte
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var c *unixConn
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var nfd int
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var n int
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var out []byte
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var ln *listener
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var lnidx int
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var fd = internal.GetFD(evs, i)
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var sa syscall.Sockaddr
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for lnidx, ln = range lns {
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if fd == ln.fd {
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goto accept
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}
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}
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c = fdconn[fd]
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if c == nil {
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syscall.Close(fd)
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goto next
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}
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if c.attaching {
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println(fd)
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goto next
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// opt, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_ERROR)
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// if opt != 0 {
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// }
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// fmt.Printf(">> %v %v\n", opt, err)
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switch evs.([]syscall.Kevent_t)[i].Filter {
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case syscall.EVFILT_WRITE:
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println(123)
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goto write
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case syscall.EVFILT_READ:
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println(456)
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goto read
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default:
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goto next
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}
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}
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goto read
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accept:
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nfd, sa, err = syscall.Accept(fd)
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if err != nil {
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goto next
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}
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if err = syscall.SetNonblock(nfd, true); err != nil {
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goto fail
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}
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if err = internal.AddRead(p, nfd); err != nil {
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goto fail
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}
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id++
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c = &unixConn{id: id, fd: nfd, p: p}
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fdconn[nfd] = c
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idconn[id] = c
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c.laddr = getlocaladdr(fd, ln.ln)
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c.raddr = getaddr(sa, ln.ln)
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if events.Opened != nil {
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unlock()
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out, c.opts, c.action = events.Opened(c.id, Addr{lnidx, c.laddr, c.raddr})
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lock()
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if c.opts.TCPKeepAlive > 0 {
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if _, ok := ln.ln.(*net.TCPListener); ok {
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if err = internal.SetKeepAlive(c.fd, int(c.opts.TCPKeepAlive/time.Second)); err != nil {
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goto fail
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}
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}
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}
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if len(out) > 0 {
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c.outbuf = append(c.outbuf, out...)
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}
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}
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goto write
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read:
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if c.action != None {
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goto write
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}
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if c.wake {
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c.wake = false
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} else {
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n, err = c.Read(packet[:])
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if n == 0 || err != nil {
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if err == syscall.EAGAIN {
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goto write
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}
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c.err = err
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goto close
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}
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in = append([]byte{}, packet[:n]...)
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}
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if events.Data != nil {
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unlock()
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out, c.action = events.Data(c.id, in)
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lock()
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}
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if len(out) > 0 {
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c.outbuf = append(c.outbuf, out...)
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}
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goto write
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write:
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if len(c.outbuf)-c.outpos > 0 {
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if events.Prewrite != nil {
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unlock()
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action := events.Prewrite(c.id, len(c.outbuf[c.outpos:]))
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lock()
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if action == Shutdown {
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c.action = Shutdown
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}
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}
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n, err = c.Write(c.outbuf[c.outpos:])
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if events.Postwrite != nil {
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amount := n
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if amount < 0 {
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amount = 0
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}
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unlock()
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action := events.Postwrite(c.id, amount, len(c.outbuf)-c.outpos-amount)
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lock()
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if action == Shutdown {
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c.action = Shutdown
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}
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}
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if n == 0 || err != nil {
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println("C")
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if c.action == Shutdown {
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goto close
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}
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if err == syscall.EAGAIN {
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if err = internal.AddWrite(c.p, c.fd, &c.writeon); err != nil {
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goto fail
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}
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goto next
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}
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c.err = err
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goto close
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}
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c.outpos += n
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if len(c.outbuf)-c.outpos == 0 {
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c.outpos = 0
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c.outbuf = c.outbuf[:0]
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}
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}
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if c.action == Shutdown {
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goto close
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}
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if len(c.outbuf)-c.outpos == 0 {
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if !c.wake {
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if err = internal.DelWrite(c.p, c.fd, &c.writeon); err != nil {
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goto fail
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}
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}
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if c.action != None {
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goto close
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}
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} else {
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if err = internal.AddWrite(c.p, c.fd, &c.writeon); err != nil {
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goto fail
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}
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}
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goto next
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close:
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delete(fdconn, c.fd)
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delete(idconn, c.id)
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if c.action == Detach {
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if events.Detached != nil {
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c.detached = true
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if len(c.outbuf)-c.outpos > 0 {
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c.outbuf = append(c.outbuf[:0], c.outbuf[c.outpos:]...)
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} else {
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c.outbuf = nil
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}
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c.outpos = 0
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syscall.SetNonblock(c.fd, false)
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unlock()
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c.action = events.Detached(c.id, c)
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lock()
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if c.action == Shutdown {
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goto fail
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}
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goto next
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}
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}
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syscall.Close(c.fd)
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if events.Closed != nil {
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unlock()
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action := events.Closed(c.id, c.err)
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lock()
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if action == Shutdown {
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c.action = Shutdown
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}
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}
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if c.action == Shutdown {
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err = nil
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goto fail
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}
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goto next
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fail:
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unlock()
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return err
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next:
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}
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unlock()
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}
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}
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func getlocaladdr(fd int, ln net.Listener) net.Addr {
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sa, _ := syscall.Getsockname(fd)
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return getaddr(sa, ln)
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}
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func getaddr(sa syscall.Sockaddr, ln net.Listener) net.Addr {
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switch ln.(type) {
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case *net.UnixListener:
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return ln.Addr()
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case *net.TCPListener:
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var addr net.TCPAddr
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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addr.IP = net.IP(sa.Addr[:])
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addr.Port = sa.Port
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return &addr
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case *syscall.SockaddrInet6:
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addr.IP = net.IP(sa.Addr[:])
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addr.Port = sa.Port
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if sa.ZoneId != 0 {
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addr.Zone = strconv.FormatInt(int64(sa.ZoneId), 10)
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}
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return &addr
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}
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}
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return nil
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}
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