wsevent.c revision 1.3
1 /* $NetBSD: wsevent.c,v 1.3 1999/01/10 00:28:21 augustss Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 1997 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 static const char _copyright[] __attribute__ ((unused)) = 34 "Copyright (c) 1996, 1997 Christopher G. Demetriou. All rights reserved."; 35 static const char _rcsid[] __attribute__ ((unused)) = 36 "$NetBSD: wsevent.c,v 1.3 1999/01/10 00:28:21 augustss Exp $"; 37 38 /* 39 * Copyright (c) 1992, 1993 40 * The Regents of the University of California. All rights reserved. 41 * 42 * This software was developed by the Computer Systems Engineering group 43 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 44 * contributed to Berkeley. 45 * 46 * All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Lawrence Berkeley Laboratory. 50 * 51 * Redistribution and use in source and binary forms, with or without 52 * modification, are permitted provided that the following conditions 53 * are met: 54 * 1. Redistributions of source code must retain the above copyright 55 * notice, this list of conditions and the following disclaimer. 56 * 2. Redistributions in binary form must reproduce the above copyright 57 * notice, this list of conditions and the following disclaimer in the 58 * documentation and/or other materials provided with the distribution. 59 * 3. All advertising materials mentioning features or use of this software 60 * must display the following acknowledgement: 61 * This product includes software developed by the University of 62 * California, Berkeley and its contributors. 63 * 4. Neither the name of the University nor the names of its contributors 64 * may be used to endorse or promote products derived from this software 65 * without specific prior written permission. 66 * 67 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 68 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 69 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 70 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 71 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 72 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 73 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 74 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 75 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 76 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 77 * SUCH DAMAGE. 78 * 79 * @(#)event.c 8.1 (Berkeley) 6/11/93 80 */ 81 82 /* 83 * Internal "wscons_event" queue interface for the keyboard and mouse drivers. 84 */ 85 86 #include <sys/param.h> 87 #include <sys/fcntl.h> 88 #include <sys/malloc.h> 89 #include <sys/proc.h> 90 #include <sys/systm.h> 91 #include <sys/vnode.h> 92 #include <sys/select.h> 93 #include <sys/poll.h> 94 95 #include <dev/wscons/wsconsio.h> 96 #include <dev/wscons/wseventvar.h> 97 98 /* 99 * Initialize a wscons_event queue. 100 */ 101 void 102 wsevent_init(ev) 103 register struct wseventvar *ev; 104 { 105 106 ev->get = ev->put = 0; 107 ev->q = malloc((u_long)WSEVENT_QSIZE * sizeof(struct wscons_event), 108 M_DEVBUF, M_WAITOK); 109 memset((caddr_t)ev->q, 0, WSEVENT_QSIZE * sizeof(struct wscons_event)); 110 } 111 112 /* 113 * Tear down a wscons_event queue. 114 */ 115 void 116 wsevent_fini(ev) 117 register struct wseventvar *ev; 118 { 119 120 free(ev->q, M_DEVBUF); 121 } 122 123 /* 124 * User-level interface: read, poll. 125 * (User cannot write an event queue.) 126 */ 127 int 128 wsevent_read(ev, uio, flags) 129 register struct wseventvar *ev; 130 struct uio *uio; 131 int flags; 132 { 133 int s, n, cnt, error; 134 135 /* 136 * Make sure we can return at least 1. 137 */ 138 if (uio->uio_resid < sizeof(struct wscons_event)) 139 return (EMSGSIZE); /* ??? */ 140 s = splwsevent(); 141 while (ev->get == ev->put) { 142 if (flags & IO_NDELAY) { 143 splx(s); 144 return (EWOULDBLOCK); 145 } 146 ev->wanted = 1; 147 error = tsleep((caddr_t)ev, PWSEVENT | PCATCH, 148 "wsevent_read", 0); 149 if (error) { 150 splx(s); 151 return (error); 152 } 153 } 154 /* 155 * Move wscons_event from tail end of queue (there is at least one 156 * there). 157 */ 158 if (ev->put < ev->get) 159 cnt = WSEVENT_QSIZE - ev->get; /* events in [get..QSIZE) */ 160 else 161 cnt = ev->put - ev->get; /* events in [get..put) */ 162 splx(s); 163 n = howmany(uio->uio_resid, sizeof(struct wscons_event)); 164 if (cnt > n) 165 cnt = n; 166 error = uiomove((caddr_t)&ev->q[ev->get], 167 cnt * sizeof(struct wscons_event), uio); 168 n -= cnt; 169 /* 170 * If we do not wrap to 0, used up all our space, or had an error, 171 * stop. Otherwise move from front of queue to put index, if there 172 * is anything there to move. 173 */ 174 if ((ev->get = (ev->get + cnt) % WSEVENT_QSIZE) != 0 || 175 n == 0 || error || (cnt = ev->put) == 0) 176 return (error); 177 if (cnt > n) 178 cnt = n; 179 error = uiomove((caddr_t)&ev->q[0], 180 cnt * sizeof(struct wscons_event), uio); 181 ev->get = cnt; 182 return (error); 183 } 184 185 int 186 wsevent_poll(ev, events, p) 187 register struct wseventvar *ev; 188 int events; 189 struct proc *p; 190 { 191 int revents = 0; 192 int s = splwsevent(); 193 194 if (events & (POLLIN | POLLRDNORM)) { 195 if (ev->get != ev->put) 196 revents |= events & (POLLIN | POLLRDNORM); 197 else 198 selrecord(p, &ev->sel); 199 } 200 201 splx(s); 202 return (revents); 203 } 204
Indexes created Thu Sep 25 16:09:42 GMT 2025