e0cc03a09b
kqueue provides a stateful and efficient event notification framework currently supported events include socket, file, directory, fifo, pipe, tty and device changes, and monitoring of processes and signals kqueue is supported by all writable filesystems in NetBSD tree (with exception of Coda) and all device drivers supporting poll(2) based on work done by Jonathan Lemon for FreeBSD initial NetBSD port done by Luke Mewburn and Jason Thorpe
90 lines
3.7 KiB
C
90 lines
3.7 KiB
C
/* $NetBSD: event_var.h,v 1.3 2002/10/23 09:12:42 jdolecek Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)event_var.h 8.1 (Berkeley) 6/11/93
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*/
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/*
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* Internal `Firm_event' interface for the keyboard and mouse drivers.
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* The drivers are expected not to place events in the queue above spltty(),
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* i.e., are expected to run off serial ports.
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*/
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/* EV_QSIZE should be a power of two so that `%' is fast */
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#define EV_QSIZE 256 /* may need tuning; this uses 2k */
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struct evvar {
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u_int ev_get; /* get (read) index (modified synchronously) */
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volatile u_int ev_put; /* put (write) index (modified by interrupt) */
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struct selinfo ev_sel; /* process selecting */
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struct proc *ev_io; /* process that opened queue (can get SIGIO) */
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char ev_wanted; /* wake up on input ready */
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char ev_async; /* send SIGIO on input ready */
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struct firm_event *ev_q;/* circular buffer (queue) of events */
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};
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#define splev() spltty()
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#define EV_WAKEUP(ev) { \
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selnotify(&(ev)->ev_sel, 0); \
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if ((ev)->ev_wanted) { \
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(ev)->ev_wanted = 0; \
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wakeup((caddr_t)(ev)); \
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} \
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if ((ev)->ev_async) \
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psignal((ev)->ev_io, SIGIO); \
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}
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void ev_init __P((struct evvar *));
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void ev_fini __P((struct evvar *));
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int ev_read __P((struct evvar *, struct uio *, int));
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int ev_select __P((struct evvar *, int, struct proc *));
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int ev_poll __P((struct evvar *, int, struct proc *));
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int ev_kqfilter __P((struct evvar *, struct knote *));
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/*
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* PEVENT is set just above PSOCK, which is just above TTIPRI, on the
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* theory that mouse and keyboard `user' input should be quick.
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*/
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#define PEVENT 23
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