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// Copyright 2009 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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// Waiting for FDs via kqueue/kevent.
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type pollster struct {
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eventbuf [10]syscall.Kevent_t
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events []syscall.Kevent_t
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func newpollster() (p *pollster, err os.Error) {
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if p.kq, e = syscall.Kqueue(); e != 0 {
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return nil, os.NewSyscallError("kqueue", e)
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p.events = p.eventbuf[0:0]
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func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
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kmode = syscall.EVFILT_READ
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kmode = syscall.EVFILT_WRITE
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var events [1]syscall.Kevent_t
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// EV_ADD - add event to kqueue list
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// EV_RECEIPT - generate fake EV_ERROR as result of add,
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// rather than waiting for real event
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// EV_ONESHOT - delete the event the first time it triggers
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flags := syscall.EV_ADD | syscall.EV_RECEIPT
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flags |= syscall.EV_ONESHOT
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syscall.SetKevent(ev, fd, kmode, flags)
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n, e := syscall.Kevent(p.kq, events[0:], events[0:], nil)
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return os.NewSyscallError("kevent", e)
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if n != 1 || (ev.Flags&syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
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return os.ErrorString("kqueue phase error")
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return os.Errno(int(ev.Data))
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func (p *pollster) DelFD(fd int, mode int) {
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kmode = syscall.EVFILT_READ
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kmode = syscall.EVFILT_WRITE
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var events [1]syscall.Kevent_t
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// EV_DELETE - delete event from kqueue list
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// EV_RECEIPT - generate fake EV_ERROR as result of add,
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// rather than waiting for real event
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syscall.SetKevent(ev, fd, kmode, syscall.EV_DELETE|syscall.EV_RECEIPT)
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syscall.Kevent(p.kq, events[0:], events[0:], nil)
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func (p *pollster) WaitFD(nsec int64) (fd int, mode int, err os.Error) {
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var t *syscall.Timespec
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for len(p.events) == 0 {
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t = new(syscall.Timespec)
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*t = syscall.NsecToTimespec(nsec)
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nn, e := syscall.Kevent(p.kq, nil, p.eventbuf[0:], t)
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if e == syscall.EINTR {
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return -1, 0, os.NewSyscallError("kevent", e)
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p.events = p.eventbuf[0:nn]
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p.events = p.events[1:]
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if ev.Filter == syscall.EVFILT_READ {
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func (p *pollster) Close() os.Error { return os.NewSyscallError("close", syscall.Close(p.kq)) }