wsevent.c revision 1.7
1 /* $NetBSD: wsevent.c,v 1.7 2001/10/24 14:07:32 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 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: wsevent.c,v 1.7 2001/10/24 14:07:32 augustss Exp $"); 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. All advertising materials mentioning features or use of this software 58 * must display the following acknowledgement: 59 * This product includes software developed by the University of 60 * California, Berkeley and its contributors. 61 * 4. Neither the name of the University nor the names of its contributors 62 * may be used to endorse or promote products derived from this software 63 * without specific prior written permission. 64 * 65 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 66 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 68 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 69 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 75 * SUCH DAMAGE. 76 * 77 * @(#)event.c 8.1 (Berkeley) 6/11/93 78 */ 79 80 /* 81 * Internal "wscons_event" queue interface for the keyboard and mouse drivers. 82 */ 83 84 #include <sys/param.h> 85 #include <sys/fcntl.h> 86 #include <sys/malloc.h> 87 #include <sys/proc.h> 88 #include <sys/systm.h> 89 #include <sys/vnode.h> 90 #include <sys/select.h> 91 #include <sys/poll.h> 92 93 #include <dev/wscons/wsconsio.h> 94 #include <dev/wscons/wseventvar.h> 95 96 /* 97 * Initialize a wscons_event queue. 98 */ 99 void 100 wsevent_init(struct wseventvar *ev) 101 { 102 103 #ifdef DIAGNOSTIC 104 if (ev->q != NULL) { 105 printf("wsevent_init: already init\n"); 106 return; 107 } 108 #endif 109 ev->get = ev->put = 0; 110 ev->q = malloc((u_long)WSEVENT_QSIZE * sizeof(struct wscons_event), 111 M_DEVBUF, M_WAITOK); 112 memset(ev->q, 0, WSEVENT_QSIZE * sizeof(struct wscons_event)); 113 } 114 115 /* 116 * Tear down a wscons_event queue. 117 */ 118 void 119 wsevent_fini(struct wseventvar *ev) 120 { 121 122 free(ev->q, M_DEVBUF); 123 ev->q = NULL; 124 } 125 126 /* 127 * Allocate a wseventvar. 128 */ 129 struct wseventvar * 130 wsevent_alloc(void) 131 { 132 struct wseventvar *ev; 133 134 ev = malloc(sizeof(*ev), M_DEVBUF, M_WAITOK); 135 memset(ev, 0, sizeof *ev); 136 wsevent_init(ev); 137 return (ev); 138 } 139 140 /* 141 * Deallocate a wseventvar. 142 */ 143 void 144 wsevent_free(struct wseventvar *ev) 145 { 146 wsevent_fini(ev); 147 free(ev, M_DEVBUF); 148 } 149 150 /* 151 * User-level interface: read, poll. 152 * (User cannot write an event queue.) 153 */ 154 int 155 wsevent_read(struct wseventvar *ev, struct uio *uio, int flags) 156 { 157 int s, n, cnt, error; 158 159 /* 160 * Make sure we can return at least 1. 161 */ 162 if (uio->uio_resid < sizeof(struct wscons_event)) 163 return (EMSGSIZE); /* ??? */ 164 s = splwsevent(); 165 while (ev->get == ev->put) { 166 if (flags & IO_NDELAY) { 167 splx(s); 168 return (EWOULDBLOCK); 169 } 170 ev->wanted = 1; 171 error = tsleep(ev, PWSEVENT | PCATCH, 172 "wsevent_read", 0); 173 if (error) { 174 splx(s); 175 return (error); 176 } 177 } 178 /* 179 * Move wscons_event from tail end of queue (there is at least one 180 * there). 181 */ 182 if (ev->put < ev->get) 183 cnt = WSEVENT_QSIZE - ev->get; /* events in [get..QSIZE) */ 184 else 185 cnt = ev->put - ev->get; /* events in [get..put) */ 186 splx(s); 187 n = howmany(uio->uio_resid, sizeof(struct wscons_event)); 188 if (cnt > n) 189 cnt = n; 190 error = uiomove(&ev->q[ev->get], 191 cnt * sizeof(struct wscons_event), uio); 192 n -= cnt; 193 /* 194 * If we do not wrap to 0, used up all our space, or had an error, 195 * stop. Otherwise move from front of queue to put index, if there 196 * is anything there to move. 197 */ 198 if ((ev->get = (ev->get + cnt) % WSEVENT_QSIZE) != 0 || 199 n == 0 || error || (cnt = ev->put) == 0) 200 return (error); 201 if (cnt > n) 202 cnt = n; 203 error = uiomove(&ev->q[0], 204 cnt * sizeof(struct wscons_event), uio); 205 ev->get = cnt; 206 return (error); 207 } 208 209 int 210 wsevent_poll(struct wseventvar *ev, int events, struct proc *p) 211 { 212 int revents = 0; 213 int s = splwsevent(); 214 215 if (events & (POLLIN | POLLRDNORM)) { 216 if (ev->get != ev->put) 217 revents |= events & (POLLIN | POLLRDNORM); 218 else 219 selrecord(p, &ev->sel); 220 } 221 222 splx(s); 223 return (revents); 224 } 225
Indexes created Thu Sep 25 16:09:42 GMT 2025