/* $OpenBSD: wsevent.c,v 1.28 2024/03/25 13:01:49 mvs 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 void filt_wseventdetach(struct knote *); int filt_wseventread(struct knote *, long); const struct filterops wsevent_filtops = { .f_flags = FILTEROP_ISFD, .f_attach = NULL, .f_detach = filt_wseventdetach, .f_event = filt_wseventread, }; /* * Initialize a wscons_event queue. */ int wsevent_init(struct wseventvar *ev) { struct wscons_event *queue; if (ev->ws_q != NULL) return (0); queue = mallocarray(WSEVENT_QSIZE, sizeof(struct wscons_event), M_DEVBUF, M_WAITOK | M_ZERO); if (ev->ws_q != NULL) { free(queue, M_DEVBUF, WSEVENT_QSIZE * sizeof(struct wscons_event)); return (1); } ev->ws_q = queue; ev->ws_get = ev->ws_put = 0; sigio_init(&ev->ws_sigio); return (0); } /* * Tear down a wscons_event queue. */ void wsevent_fini(struct wseventvar *ev) { if (ev->ws_q == NULL) { #ifdef DIAGNOSTIC printf("wsevent_fini: already invoked\n"); #endif return; } free(ev->ws_q, M_DEVBUF, WSEVENT_QSIZE * sizeof(struct wscons_event)); ev->ws_q = NULL; klist_invalidate(&ev->ws_sel.si_note); sigio_free(&ev->ws_sigio); } /* * User-level interface: read, kqueue. * (User cannot write an event queue.) */ int wsevent_read(struct wseventvar *ev, struct uio *uio, int flags) { int s, error; u_int cnt; size_t n; /* * Make sure we can return at least 1. */ if (uio->uio_resid < sizeof(struct wscons_event)) return (EMSGSIZE); /* ??? */ s = splwsevent(); while (ev->ws_get == ev->ws_put) { if (flags & IO_NDELAY) { splx(s); return (EWOULDBLOCK); } ev->ws_wanted = 1; error = tsleep_nsec(ev, PWSEVENT | PCATCH, "wsevent_read", INFSLP); if (error) { splx(s); return (error); } } /* * Move wscons_event from tail end of queue (there is at least one * there). */ if (ev->ws_put < ev->ws_get) cnt = WSEVENT_QSIZE - ev->ws_get; /* events in [get..QSIZE) */ else cnt = ev->ws_put - ev->ws_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->ws_q[ev->ws_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->ws_get = (ev->ws_get + cnt) % WSEVENT_QSIZE) != 0 || n == 0 || error || (cnt = ev->ws_put) == 0) return (error); if (cnt > n) cnt = n; error = uiomove((caddr_t)&ev->ws_q[0], cnt * sizeof(struct wscons_event), uio); ev->ws_get = cnt; return (error); } int wsevent_kqfilter(struct wseventvar *ev, struct knote *kn) { struct klist *klist; int s; klist = &ev->ws_sel.si_note; switch (kn->kn_filter) { case EVFILT_READ: kn->kn_fop = &wsevent_filtops; break; default: return (EINVAL); } kn->kn_hook = ev; s = splwsevent(); klist_insert_locked(klist, kn); splx(s); return (0); } void filt_wseventdetach(struct knote *kn) { struct wseventvar *ev = kn->kn_hook; struct klist *klist = &ev->ws_sel.si_note; int s; s = splwsevent(); klist_remove_locked(klist, kn); splx(s); } int filt_wseventread(struct knote *kn, long hint) { struct wseventvar *ev = kn->kn_hook; if (ev->ws_get == ev->ws_put) return (0); if (ev->ws_get < ev->ws_put) kn->kn_data = ev->ws_put - ev->ws_get; else kn->kn_data = (WSEVENT_QSIZE - ev->ws_get) + ev->ws_put; return (1); }