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// Copyright 2009 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.
// Waiting for FDs via kqueue/kevent.
package net
import (
"os";
"syscall";
)
type pollster struct {
kq int;
eventbuf [10]syscall.Kevent_t;
events []syscall.Kevent_t;
}
func newpollster() (p *pollster, err os.Error) {
p = new(pollster);
var e int;
if p.kq, e = syscall.Kqueue(); e != 0 {
return nil, os.NewSyscallError("kqueue", e)
}
p.events = p.eventbuf[0:0];
return p, nil;
}
func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
var kmode int;
if mode == 'r' {
kmode = syscall.EVFILT_READ
} else {
kmode = syscall.EVFILT_WRITE
}
var events [1]syscall.Kevent_t;
ev := &events[0];
// EV_ADD - add event to kqueue list
// EV_RECEIPT - generate fake EV_ERROR as result of add,
// rather than waiting for real event
// EV_ONESHOT - delete the event the first time it triggers
flags := syscall.EV_ADD | syscall.EV_RECEIPT;
if !repeat {
flags |= syscall.EV_ONESHOT
}
syscall.SetKevent(ev, fd, kmode, flags);
n, e := syscall.Kevent(p.kq, &events, &events, nil);
if e != 0 {
return os.NewSyscallError("kevent", e)
}
if n != 1 || (ev.Flags & syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
return os.ErrorString("kqueue phase error")
}
if ev.Data != 0 {
return os.Errno(int(ev.Data))
}
return nil;
}
func (p *pollster) DelFD(fd int, mode int) {
var kmode int;
if mode == 'r' {
kmode = syscall.EVFILT_READ
} else {
kmode = syscall.EVFILT_WRITE
}
var events [1]syscall.Kevent_t;
ev := &events[0];
// EV_DELETE - delete event from kqueue list
// EV_RECEIPT - generate fake EV_ERROR as result of add,
// rather than waiting for real event
syscall.SetKevent(ev, fd, kmode, syscall.EV_DELETE | syscall.EV_RECEIPT);
syscall.Kevent(p.kq, &events, &events, nil);
}
func (p *pollster) WaitFD(nsec int64) (fd int, mode int, err os.Error) {
var t *syscall.Timespec;
for len(p.events) == 0 {
if nsec > 0 {
if t == nil {
t = new(syscall.Timespec)
}
*t = syscall.NsecToTimespec(nsec);
}
nn, e := syscall.Kevent(p.kq, nil, &p.eventbuf, t);
if e != 0 {
if e == syscall.EINTR {
continue
}
return -1, 0, os.NewSyscallError("kevent", e);
}
if nn == 0 {
return -1, 0, nil
}
p.events = p.eventbuf[0:nn];
}
ev := &p.events[0];
p.events = p.events[1:len(p.events)];
fd = int(ev.Ident);
if ev.Filter == syscall.EVFILT_READ {
mode = 'r'
} else {
mode = 'w'
}
return fd, mode, nil;
}
func (p *pollster) Close() os.Error { return os.NewSyscallError("close", syscall.Close(p.kq)) }
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