Annotation of sys/dev/wscons/wsevent.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: wsevent.c,v 1.5 2005/11/21 18:16:45 millert Exp $ */
! 2: /* $NetBSD: wsevent.c,v 1.16 2003/08/07 16:31:29 agc Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1996, 1997 Christopher G. Demetriou. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by Christopher G. Demetriou
! 18: * for the NetBSD Project.
! 19: * 4. The name of the author may not be used to endorse or promote products
! 20: * derived from this software without specific prior written permission
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 32: */
! 33:
! 34: #include <sys/cdefs.h>
! 35:
! 36: /*
! 37: * Copyright (c) 1992, 1993
! 38: * The Regents of the University of California. All rights reserved.
! 39: *
! 40: * This software was developed by the Computer Systems Engineering group
! 41: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 42: * contributed to Berkeley.
! 43: *
! 44: * All advertising materials mentioning features or use of this software
! 45: * must display the following acknowledgement:
! 46: * This product includes software developed by the University of
! 47: * California, Lawrence Berkeley Laboratory.
! 48: *
! 49: * Redistribution and use in source and binary forms, with or without
! 50: * modification, are permitted provided that the following conditions
! 51: * are met:
! 52: * 1. Redistributions of source code must retain the above copyright
! 53: * notice, this list of conditions and the following disclaimer.
! 54: * 2. Redistributions in binary form must reproduce the above copyright
! 55: * notice, this list of conditions and the following disclaimer in the
! 56: * documentation and/or other materials provided with the distribution.
! 57: * 3. Neither the name of the University nor the names of its contributors
! 58: * may be used to endorse or promote products derived from this software
! 59: * without specific prior written permission.
! 60: *
! 61: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 62: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 63: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 64: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 65: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 66: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 67: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 68: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 69: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 70: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 71: * SUCH DAMAGE.
! 72: *
! 73: * @(#)event.c 8.1 (Berkeley) 6/11/93
! 74: */
! 75:
! 76: /*
! 77: * Internal "wscons_event" queue interface for the keyboard and mouse drivers.
! 78: */
! 79:
! 80: #include <sys/param.h>
! 81: #include <sys/fcntl.h>
! 82: #include <sys/malloc.h>
! 83: #include <sys/proc.h>
! 84: #include <sys/systm.h>
! 85: #include <sys/vnode.h>
! 86: #include <sys/selinfo.h>
! 87: #include <sys/poll.h>
! 88:
! 89: #include <dev/wscons/wsconsio.h>
! 90: #include <dev/wscons/wseventvar.h>
! 91:
! 92: /*
! 93: * Initialize a wscons_event queue.
! 94: */
! 95: void
! 96: wsevent_init(struct wseventvar *ev)
! 97: {
! 98:
! 99: if (ev->q != NULL) {
! 100: #ifdef DIAGNOSTIC
! 101: printf("wsevent_init: already initialized\n");
! 102: #endif
! 103: return;
! 104: }
! 105: ev->get = ev->put = 0;
! 106: ev->q = malloc((u_long)WSEVENT_QSIZE * sizeof(struct wscons_event),
! 107: M_DEVBUF, M_WAITOK);
! 108: bzero((caddr_t)ev->q, WSEVENT_QSIZE * sizeof(struct wscons_event));
! 109: }
! 110:
! 111: /*
! 112: * Tear down a wscons_event queue.
! 113: */
! 114: void
! 115: wsevent_fini(struct wseventvar *ev)
! 116: {
! 117: if (ev->q == NULL) {
! 118: #ifdef DIAGNOSTIC
! 119: printf("wsevent_fini: already invoked\n");
! 120: #endif
! 121: return;
! 122: }
! 123: free(ev->q, M_DEVBUF);
! 124: ev->q = NULL;
! 125: }
! 126:
! 127: /*
! 128: * User-level interface: read, poll.
! 129: * (User cannot write an event queue.)
! 130: */
! 131: int
! 132: wsevent_read(struct wseventvar *ev, struct uio *uio, int flags)
! 133: {
! 134: int s, n, cnt, error;
! 135:
! 136: /*
! 137: * Make sure we can return at least 1.
! 138: */
! 139: if (uio->uio_resid < sizeof(struct wscons_event))
! 140: return (EMSGSIZE); /* ??? */
! 141: s = splwsevent();
! 142: while (ev->get == ev->put) {
! 143: if (flags & IO_NDELAY) {
! 144: splx(s);
! 145: return (EWOULDBLOCK);
! 146: }
! 147: ev->wanted = 1;
! 148: error = tsleep(ev, PWSEVENT | PCATCH,
! 149: "wsevent_read", 0);
! 150: if (error) {
! 151: splx(s);
! 152: return (error);
! 153: }
! 154: }
! 155: /*
! 156: * Move wscons_event from tail end of queue (there is at least one
! 157: * there).
! 158: */
! 159: if (ev->put < ev->get)
! 160: cnt = WSEVENT_QSIZE - ev->get; /* events in [get..QSIZE) */
! 161: else
! 162: cnt = ev->put - ev->get; /* events in [get..put) */
! 163: splx(s);
! 164: n = howmany(uio->uio_resid, sizeof(struct wscons_event));
! 165: if (cnt > n)
! 166: cnt = n;
! 167: error = uiomove((caddr_t)&ev->q[ev->get],
! 168: cnt * sizeof(struct wscons_event), uio);
! 169: n -= cnt;
! 170: /*
! 171: * If we do not wrap to 0, used up all our space, or had an error,
! 172: * stop. Otherwise move from front of queue to put index, if there
! 173: * is anything there to move.
! 174: */
! 175: if ((ev->get = (ev->get + cnt) % WSEVENT_QSIZE) != 0 ||
! 176: n == 0 || error || (cnt = ev->put) == 0)
! 177: return (error);
! 178: if (cnt > n)
! 179: cnt = n;
! 180: error = uiomove((caddr_t)&ev->q[0],
! 181: cnt * sizeof(struct wscons_event), uio);
! 182: ev->get = cnt;
! 183: return (error);
! 184: }
! 185:
! 186: int
! 187: wsevent_poll(struct wseventvar *ev, int events, struct proc *p)
! 188: {
! 189: int revents = 0;
! 190: int s = splwsevent();
! 191:
! 192: if (events & (POLLIN | POLLRDNORM)) {
! 193: if (ev->get != ev->put)
! 194: revents |= events & (POLLIN | POLLRDNORM);
! 195: else
! 196: selrecord(p, &ev->sel);
! 197: }
! 198:
! 199: splx(s);
! 200: return (revents);
! 201: }
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