/* $OpenBSD: wsevent.c,v 1.8 2012/12/05 23:20:22 deraadt Exp $ */ /* $NetBSD: wsevent.c,v 1.16 2003/08/07 16:31:29 agc Exp $ */ /* * Copyright (c) 1996, 1997 Christopher G. Demetriou. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Christopher G. Demetriou * for the NetBSD Project. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)event.c 8.1 (Berkeley) 6/11/93 */ /* * Internal "wscons_event" queue interface for the keyboard and mouse drivers. */ #include #include #include #include #include #include #include #include #include #include /* * Initialize a wscons_event queue. */ void wsevent_init(struct wseventvar *ev) { if (ev->q != NULL) { #ifdef DIAGNOSTIC printf("wsevent_init: already initialized\n"); #endif return; } ev->get = ev->put = 0; ev->q = malloc((u_long)WSEVENT_QSIZE * sizeof(struct wscons_event), M_DEVBUF, M_WAITOK | M_ZERO); } /* * Tear down a wscons_event queue. */ void wsevent_fini(struct wseventvar *ev) { if (ev->q == NULL) { #ifdef DIAGNOSTIC printf("wsevent_fini: already invoked\n"); #endif return; } free(ev->q, M_DEVBUF); ev->q = NULL; } /* * User-level interface: read, poll. * (User cannot write an event queue.) */ int wsevent_read(struct wseventvar *ev, struct uio *uio, int flags) { int s, n, cnt, error; /* * Make sure we can return at least 1. */ if (uio->uio_resid < sizeof(struct wscons_event)) return (EMSGSIZE); /* ??? */ s = splwsevent(); while (ev->get == ev->put) { if (flags & IO_NDELAY) { splx(s); return (EWOULDBLOCK); } ev->wanted = 1; error = tsleep(ev, PWSEVENT | PCATCH, "wsevent_read", 0); if (error) { splx(s); return (error); } } /* * Move wscons_event from tail end of queue (there is at least one * there). */ if (ev->put < ev->get) cnt = WSEVENT_QSIZE - ev->get; /* events in [get..QSIZE) */ else cnt = ev->put - ev->get; /* events in [get..put) */ splx(s); n = howmany(uio->uio_resid, sizeof(struct wscons_event)); if (cnt > n) cnt = n; error = uiomove((caddr_t)&ev->q[ev->get], cnt * sizeof(struct wscons_event), uio); n -= cnt; /* * If we do not wrap to 0, used up all our space, or had an error, * stop. Otherwise move from front of queue to put index, if there * is anything there to move. */ if ((ev->get = (ev->get + cnt) % WSEVENT_QSIZE) != 0 || n == 0 || error || (cnt = ev->put) == 0) return (error); if (cnt > n) cnt = n; error = uiomove((caddr_t)&ev->q[0], cnt * sizeof(struct wscons_event), uio); ev->get = cnt; return (error); } int wsevent_poll(struct wseventvar *ev, int events, struct proc *p) { int revents = 0; int s = splwsevent(); if (events & (POLLIN | POLLRDNORM)) { if (ev->get != ev->put) revents |= events & (POLLIN | POLLRDNORM); else selrecord(p, &ev->sel); } splx(s); return (revents); }