1
// Copyright 2009 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.
5
// Waiting for FDs via kqueue/kevent.
14
type pollster struct {
16
eventbuf [10]syscall.Kevent_t
17
events []syscall.Kevent_t
19
// An event buffer for AddFD/DelFD.
20
// Must hold pollServer lock.
21
kbuf [1]syscall.Kevent_t
24
func newpollster() (p *pollster, err error) {
26
if p.kq, err = syscall.Kqueue(); err != nil {
27
return nil, os.NewSyscallError("kqueue", err)
29
syscall.CloseOnExec(p.kq)
30
p.events = p.eventbuf[0:0]
34
func (p *pollster) AddFD(fd int, mode int, repeat bool) (bool, error) {
35
// pollServer is locked.
39
kmode = syscall.EVFILT_READ
41
kmode = syscall.EVFILT_WRITE
44
// EV_ADD - add event to kqueue list
45
// EV_ONESHOT - delete the event the first time it triggers
46
flags := syscall.EV_ADD
48
flags |= syscall.EV_ONESHOT
50
syscall.SetKevent(ev, fd, kmode, flags)
52
n, err := syscall.Kevent(p.kq, p.kbuf[:], nil, nil)
54
return false, os.NewSyscallError("kevent", err)
56
if n != 1 || (ev.Flags&syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
57
return false, os.NewSyscallError("kqueue phase error", err)
60
return false, syscall.Errno(int(ev.Data))
65
func (p *pollster) DelFD(fd int, mode int) {
66
// pollServer is locked.
70
kmode = syscall.EVFILT_READ
72
kmode = syscall.EVFILT_WRITE
75
// EV_DELETE - delete event from kqueue list
76
syscall.SetKevent(ev, fd, kmode, syscall.EV_DELETE)
77
syscall.Kevent(p.kq, p.kbuf[:], nil, nil)
80
func (p *pollster) WaitFD(s *pollServer, nsec int64) (fd int, mode int, err error) {
81
var t *syscall.Timespec
82
for len(p.events) == 0 {
85
t = new(syscall.Timespec)
87
*t = syscall.NsecToTimespec(nsec)
91
n, err := syscall.Kevent(p.kq, nil, p.eventbuf[:], t)
95
if err == syscall.EINTR {
98
return -1, 0, os.NewSyscallError("kevent", err)
103
p.events = p.eventbuf[:n]
106
p.events = p.events[1:]
108
if ev.Filter == syscall.EVFILT_READ {
116
func (p *pollster) Close() error { return os.NewSyscallError("close", syscall.Close(p.kq)) }