/* * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ * */ /*- * Copyright (c) 1999,2000,2001 Jonathan Lemon * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ /* * @(#)kern_event.c 1.0 (3/31/2000) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MALLOC_DEFINE(M_KQUEUE, "kqueue", "memory for kqueue system"); static int kqueue_scan(struct file *fp, int maxevents, struct kevent *ulistp, const struct timespec *timeout, register_t *retval, struct proc *p); static void kqueue_wakeup(struct kqueue *kq); static int kqueue_read __P((struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p)); static int kqueue_write __P((struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p)); static int kqueue_ioctl __P((struct file *fp, u_long com, caddr_t data, struct proc *p)); static int kqueue_select __P((struct file *fp, int which, void *wql, struct proc *p)); static int kqueue_close __P((struct file *fp, struct proc *p)); static int kqueue_kqfilter __P((struct file *fp, struct knote *kn, struct proc *p)); static struct fileops kqueueops = { kqueue_read, kqueue_write, kqueue_ioctl, kqueue_select, kqueue_close, kqueue_kqfilter }; static void knote_fdpattach(struct knote *kn, struct filedesc *fdp); static void knote_drop(struct knote *kn, struct proc *p); static void knote_enqueue(struct knote *kn); static void knote_dequeue(struct knote *kn); static struct knote *knote_alloc(void); static void knote_free(struct knote *kn); static int filt_fileattach(struct knote *kn); static struct filterops file_filtops = { 1, filt_fileattach, NULL, NULL }; static void filt_kqdetach(struct knote *kn); static int filt_kqueue(struct knote *kn, long hint); static struct filterops kqread_filtops = { 1, NULL, filt_kqdetach, filt_kqueue }; /* * JMM - placeholder for not-yet-implemented filters */ static int filt_badattach(struct knote *kn); static struct filterops bad_filtops = { 0, filt_badattach, 0 , 0 }; static int filt_procattach(struct knote *kn); static void filt_procdetach(struct knote *kn); static int filt_proc(struct knote *kn, long hint); static struct filterops proc_filtops = { 0, filt_procattach, filt_procdetach, filt_proc }; extern struct filterops fs_filtops; extern struct filterops sig_filtops; #if 0 /* JMM - We don't implement these now */ static void filt_timerexpire(void *knx); static int filt_timerattach(struct knote *kn); static void filt_timerdetach(struct knote *kn); static int filt_timer(struct knote *kn, long hint); static struct filterops timer_filtops = { 0, filt_timerattach, filt_timerdetach, filt_timer }; static int kq_ncallouts = 0; static int kq_calloutmax = (4 * 1024); SYSCTL_INT(_kern, OID_AUTO, kq_calloutmax, CTLFLAG_RW, &kq_calloutmax, 0, "Maximum number of callouts allocated for kqueue"); #endif /* 0 */ static zone_t knote_zone; #define KNOTE_ACTIVATE(kn) do { \ kn->kn_status |= KN_ACTIVE; \ if ((kn->kn_status & (KN_QUEUED | KN_DISABLED)) == 0) \ knote_enqueue(kn); \ } while(0) #define KN_HASHSIZE 64 /* XXX should be tunable */ #define KN_HASH(val, mask) (((val) ^ (val >> 8)) & (mask)) #if 0 extern struct filterops aio_filtops; #endif /* * Table for for all system-defined filters. */ static struct filterops *sysfilt_ops[] = { &file_filtops, /* EVFILT_READ */ &file_filtops, /* EVFILT_WRITE */ #if 0 &aio_filtops, /* EVFILT_AIO */ #else &bad_filtops, /* EVFILT_AIO */ #endif &file_filtops, /* EVFILT_VNODE */ &proc_filtops, /* EVFILT_PROC */ &sig_filtops, /* EVFILT_SIGNAL */ #if 0 &timer_filtops, /* EVFILT_TIMER */ #else &bad_filtops, /* EVFILT_TIMER */ #endif &bad_filtops, /* EVFILT_MACHPORT */ &fs_filtops /* EVFILT_FS */ }; static int filt_fileattach(struct knote *kn) { return (fo_kqfilter(kn->kn_fp, kn, current_proc())); } static void filt_kqdetach(struct knote *kn) { struct kqueue *kq = (struct kqueue *)kn->kn_fp->f_data; if (kq->kq_state & KQ_SEL) return; KNOTE_DETACH(&kq->kq_sel.si_note, kn); } /*ARGSUSED*/ static int filt_kqueue(struct knote *kn, long hint) { struct kqueue *kq = (struct kqueue *)kn->kn_fp->f_data; kn->kn_data = kq->kq_count; return (kn->kn_data > 0); } static int filt_procattach(struct knote *kn) { struct proc *p; p = pfind(kn->kn_id); if (p == NULL) return (ESRCH); if (! PRISON_CHECK(current_proc(), p)) return (EACCES); kn->kn_ptr.p_proc = p; kn->kn_flags |= EV_CLEAR; /* automatically set */ /* * internal flag indicating registration done by kernel */ if (kn->kn_flags & EV_FLAG1) { kn->kn_data = kn->kn_sdata; /* ppid */ kn->kn_fflags = NOTE_CHILD; kn->kn_flags &= ~EV_FLAG1; } /* XXX lock the proc here while adding to the list? */ KNOTE_ATTACH(&p->p_klist, kn); return (0); } /* * The knote may be attached to a different process, which may exit, * leaving nothing for the knote to be attached to. So when the process * exits, the knote is marked as DETACHED and also flagged as ONESHOT so * it will be deleted when read out. However, as part of the knote deletion, * this routine is called, so a check is needed to avoid actually performing * a detach, because the original process does not exist any more. */ static void filt_procdetach(struct knote *kn) { struct proc *p = kn->kn_ptr.p_proc; if (kn->kn_status & KN_DETACHED) return; /* XXX locking? this might modify another process. */ KNOTE_DETACH(&p->p_klist, kn); } static int filt_proc(struct knote *kn, long hint) { u_int event; /* * mask off extra data */ event = (u_int)hint & NOTE_PCTRLMASK; /* * if the user is interested in this event, record it. */ if (kn->kn_sfflags & event) kn->kn_fflags |= event; /* * process is gone, so flag the event as finished. */ if (event == NOTE_EXIT) { kn->kn_status |= KN_DETACHED; kn->kn_flags |= (EV_EOF | EV_ONESHOT); return (1); } /* * process forked, and user wants to track the new process, * so attach a new knote to it, and immediately report an * event with the parent's pid. */ if ((event == NOTE_FORK) && (kn->kn_sfflags & NOTE_TRACK)) { struct kevent kev; int error; /* * register knote with new process. */ kev.ident = hint & NOTE_PDATAMASK; /* pid */ kev.filter = kn->kn_filter; kev.flags = kn->kn_flags | EV_ADD | EV_ENABLE | EV_FLAG1; kev.fflags = kn->kn_sfflags; kev.data = kn->kn_id; /* parent */ kev.udata = kn->kn_kevent.udata; /* preserve udata */ error = kqueue_register(kn->kn_kq, &kev, NULL); if (error) kn->kn_fflags |= NOTE_TRACKERR; } return (kn->kn_fflags != 0); } #if 0 static void filt_timerexpire(void *knx) { struct knote *kn = knx; struct callout *calloutp; struct timeval tv; int tticks; kn->kn_data++; KNOTE_ACTIVATE(kn); if ((kn->kn_flags & EV_ONESHOT) == 0) { tv.tv_sec = kn->kn_sdata / 1000; tv.tv_usec = (kn->kn_sdata % 1000) * 1000; tticks = tvtohz(&tv); calloutp = (struct callout *)kn->kn_hook; callout_reset(calloutp, tticks, filt_timerexpire, kn); } } /* * data contains amount of time to sleep, in milliseconds */ static int filt_timerattach(struct knote *kn) { struct callout *calloutp; struct timeval tv; int tticks; if (kq_ncallouts >= kq_calloutmax) return (ENOMEM); kq_ncallouts++; tv.tv_sec = kn->kn_sdata / 1000; tv.tv_usec = (kn->kn_sdata % 1000) * 1000; tticks = tvtohz(&tv); kn->kn_flags |= EV_CLEAR; /* automatically set */ MALLOC(calloutp, struct callout *, sizeof(*calloutp), M_KQUEUE, M_WAITOK); callout_init(calloutp); callout_reset(calloutp, tticks, filt_timerexpire, kn); kn->kn_hook = (caddr_t)calloutp; return (0); } static void filt_timerdetach(struct knote *kn) { struct callout *calloutp; calloutp = (struct callout *)kn->kn_hook; callout_stop(calloutp); FREE(calloutp, M_KQUEUE); kq_ncallouts--; } static int filt_timer(struct knote *kn, long hint) { return (kn->kn_data != 0); } #endif /* 0 */ /* * JMM - placeholder for not-yet-implemented filters */ static int filt_badattach(struct knote *kn) { return(EOPNOTSUPP); } #ifndef _SYS_SYSPROTO_H_ struct kqueue_args { int dummy; }; #endif int kqueue(struct proc *p, struct kqueue_args *uap, register_t *retval) { struct filedesc *fdp = p->p_fd; struct kqueue *kq; struct file *fp; int fd, error; error = falloc(p, &fp, &fd); if (error) return (error); fp->f_flag = FREAD | FWRITE; fp->f_type = DTYPE_KQUEUE; fp->f_ops = &kqueueops; kq = (struct kqueue *)_MALLOC(sizeof(struct kqueue), M_KQUEUE, M_WAITOK | M_ZERO); TAILQ_INIT(&kq->kq_head); fp->f_data = (caddr_t)kq; *retval = fd; if (fdp->fd_knlistsize < 0) fdp->fd_knlistsize = 0; /* this process has a kq */ kq->kq_fdp = fdp; return (error); } #ifndef _SYS_SYSPROTO_H_ struct kqueue_portset_np_args { int fd; }; #endif int kqueue_portset_np(struct proc *p, struct kqueue_portset_np_args *uap, register_t *retval) { /* JMM - Placeholder for now */ return (EOPNOTSUPP); } #ifndef _SYS_SYSPROTO_H_ struct kqueue_from_portset_np_args { int fd; }; #endif int kqueue_from_portset_np(struct proc *p, struct kqueue_from_portset_np_args *uap, register_t *retval) { /* JMM - Placeholder for now */ return (EOPNOTSUPP); } #if !0 /* JMM - We don't implement this yet */ #define fhold(fp) #define fdrop(fp, p) #endif /* !0 */ #ifndef _SYS_SYSPROTO_H_ struct kevent_args { int fd; const struct kevent *changelist; int nchanges; struct kevent *eventlist; int nevents; const struct timespec *timeout; }; #endif int kevent(struct proc *p, struct kevent_args *uap, register_t *retval) { struct filedesc* fdp = p->p_fd; struct kqueue *kq; struct file *fp = NULL; struct timespec ts; int i, nerrors, error; if (uap->timeout != NULL) { error = copyin((caddr_t)uap->timeout, (caddr_t)&ts, sizeof(ts)); if (error) goto done; uap->timeout = &ts; } if (((u_int)uap->fd) >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[uap->fd]) == NULL || (fp->f_type != DTYPE_KQUEUE)) return (EBADF); fhold(fp); kq = (struct kqueue *)fp->f_data; nerrors = 0; while (uap->nchanges > 0) { int i; int n = uap->nchanges > KQ_NEVENTS ? KQ_NEVENTS : uap->nchanges; struct kevent kq_kev[n]; error = copyin((caddr_t)uap->changelist, (caddr_t)kq_kev, n * sizeof(struct kevent)); if (error) goto done; for (i = 0; i < n; i++) { struct kevent *kevp = &kq_kev[i]; kevp->flags &= ~EV_SYSFLAGS; error = kqueue_register(kq, kevp, p); if (error) { if (uap->nevents != 0) { kevp->flags = EV_ERROR; kevp->data = error; (void) copyout((caddr_t)kevp, (caddr_t)uap->eventlist, sizeof(*kevp)); uap->eventlist++; uap->nevents--; nerrors++; } else { goto done; } } } uap->nchanges -= n; uap->changelist += n; } if (nerrors) { *retval = nerrors; error = 0; goto done; } error = kqueue_scan(fp, uap->nevents, uap->eventlist, uap->timeout, retval, p); done: if (fp != NULL) fdrop(fp, p); return (error); } int kqueue_register(struct kqueue *kq, struct kevent *kev, struct proc *p) { struct filedesc *fdp = kq->kq_fdp; struct filterops *fops; struct file *fp = NULL; struct knote *kn = NULL; int s, error = 0; if (kev->filter < 0) { if (kev->filter + EVFILT_SYSCOUNT < 0) return (EINVAL); fops = sysfilt_ops[~kev->filter]; /* to 0-base index */ } else { /* * XXX * filter attach routine is responsible for insuring that * the identifier can be attached to it. */ printf("unknown filter: %d\n", kev->filter); return (EINVAL); } if (fops->f_isfd) { /* validate descriptor */ if ((u_int)kev->ident >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[kev->ident]) == NULL) return (EBADF); fhold(fp); if (kev->ident < fdp->fd_knlistsize) { SLIST_FOREACH(kn, &fdp->fd_knlist[kev->ident], kn_link) if (kq == kn->kn_kq && kev->filter == kn->kn_filter) break; } } else { if (fdp->fd_knhashmask != 0) { struct klist *list; list = &fdp->fd_knhash[ KN_HASH((u_long)kev->ident, fdp->fd_knhashmask)]; SLIST_FOREACH(kn, list, kn_link) if (kev->ident == kn->kn_id && kq == kn->kn_kq && kev->filter == kn->kn_filter) break; } } if (kn == NULL && ((kev->flags & EV_ADD) == 0)) { error = ENOENT; goto done; } /* * kn now contains the matching knote, or NULL if no match */ if (kev->flags & EV_ADD) { if (kn == NULL) { kn = knote_alloc(); if (kn == NULL) { error = ENOMEM; goto done; } kn->kn_fp = fp; kn->kn_kq = kq; kn->kn_fop = fops; /* * apply reference count to knote structure, and * do not release it at the end of this routine. */ fp = NULL; kn->kn_sfflags = kev->fflags; kn->kn_sdata = kev->data; kev->fflags = 0; kev->data = 0; kn->kn_kevent = *kev; knote_fdpattach(kn, fdp); if ((error = fops->f_attach(kn)) != 0) { knote_drop(kn, p); goto done; } } else { /* * The user may change some filter values after the * initial EV_ADD, but doing so will not reset any * filter which have already been triggered. */ kn->kn_sfflags = kev->fflags; kn->kn_sdata = kev->data; kn->kn_kevent.udata = kev->udata; } s = splhigh(); if (kn->kn_fop->f_event(kn, 0)) KNOTE_ACTIVATE(kn); splx(s); } else if (kev->flags & EV_DELETE) { kn->kn_fop->f_detach(kn); knote_drop(kn, p); goto done; } if ((kev->flags & EV_DISABLE) && ((kn->kn_status & KN_DISABLED) == 0)) { s = splhigh(); kn->kn_status |= KN_DISABLED; splx(s); } if ((kev->flags & EV_ENABLE) && (kn->kn_status & KN_DISABLED)) { s = splhigh(); kn->kn_status &= ~KN_DISABLED; if ((kn->kn_status & KN_ACTIVE) && ((kn->kn_status & KN_QUEUED) == 0)) knote_enqueue(kn); splx(s); } done: if (fp != NULL) fdrop(fp, p); return (error); } static int kqueue_scan(struct file *fp, int maxevents, struct kevent *ulistp, const struct timespec *tsp, register_t *retval, struct proc *p) { struct kqueue *kq = (struct kqueue *)fp->f_data; struct timeval atv, rtv, ttv; int s, count, timeout, error = 0; struct knote marker; count = maxevents; if (count == 0) goto done; if (tsp != NULL) { TIMESPEC_TO_TIMEVAL(&atv, tsp); if (itimerfix(&atv)) { error = EINVAL; goto done; } if (tsp->tv_sec == 0 && tsp->tv_nsec == 0) timeout = -1; else timeout = atv.tv_sec > 24 * 60 * 60 ? 24 * 60 * 60 * hz : tvtohz(&atv); getmicrouptime(&rtv); timevaladd(&atv, &rtv); } else { atv.tv_sec = 0; atv.tv_usec = 0; timeout = 0; } goto start; retry: if (atv.tv_sec || atv.tv_usec) { getmicrouptime(&rtv); if (timevalcmp(&rtv, &atv, >=)) goto done; ttv = atv; timevalsub(&ttv, &rtv); timeout = ttv.tv_sec > 24 * 60 * 60 ? 24 * 60 * 60 * hz : tvtohz(&ttv); } start: s = splhigh(); if (kq->kq_count == 0) { if (timeout < 0) { error = EWOULDBLOCK; } else { kq->kq_state |= KQ_SLEEP; error = tsleep(kq, PSOCK | PCATCH, "kqread", timeout); } splx(s); if (error == 0) goto retry; /* don't restart after signals... */ if (error == ERESTART) error = EINTR; else if (error == EWOULDBLOCK) error = 0; goto done; } /* JMM - This marker trick doesn't work with multiple threads */ TAILQ_INSERT_TAIL(&kq->kq_head, &marker, kn_tqe); while (count) { int maxkev = (count > KQ_NEVENTS) ? KQ_NEVENTS : count; struct kevent kq_kev[maxkev]; struct kevent *kevp = kq_kev; struct knote *kn; int nkev = 0; while (nkev < maxkev) { kn = TAILQ_FIRST(&kq->kq_head); TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); if (kn == &marker) { if (count == maxevents) goto retry; break; } else if (kn->kn_status & KN_DISABLED) { kn->kn_status &= ~KN_QUEUED; kq->kq_count--; continue; } else if ((kn->kn_flags & EV_ONESHOT) == 0 && kn->kn_fop->f_event(kn, 0) == 0) { kn->kn_status &= ~(KN_QUEUED | KN_ACTIVE); kq->kq_count--; continue; } *kevp = kn->kn_kevent; kevp++; nkev++; count--; if (kn->kn_flags & EV_ONESHOT) { kn->kn_status &= ~KN_QUEUED; kq->kq_count--; splx(s); kn->kn_fop->f_detach(kn); knote_drop(kn, p); s = splhigh(); } else if (kn->kn_flags & EV_CLEAR) { kn->kn_data = 0; kn->kn_fflags = 0; kn->kn_status &= ~(KN_QUEUED | KN_ACTIVE); kq->kq_count--; } else { TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); } } splx(s); error = copyout((caddr_t)kq_kev, (caddr_t)ulistp, sizeof(struct kevent) * nkev); if (kn == &marker) goto done; ulistp += nkev; s = splhigh(); if (error) break; } TAILQ_REMOVE(&kq->kq_head, &marker, kn_tqe); splx(s); done: *retval = maxevents - count; return (error); } /* * XXX * This could be expanded to call kqueue_scan, if desired. */ /*ARGSUSED*/ static int kqueue_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p) { return (ENXIO); } /*ARGSUSED*/ static int kqueue_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p) { return (ENXIO); } /*ARGSUSED*/ static int kqueue_ioctl(struct file *fp, u_long com, caddr_t data, struct proc *p) { return (ENOTTY); } /*ARGSUSED*/ static int kqueue_select(struct file *fp, int which, void *wql, struct proc *p) { struct kqueue *kq = (struct kqueue *)fp->f_data; int retnum = 0; int s = splnet(); if (which == FREAD) { if (kq->kq_count) { retnum = 1; } else { selrecord(p, &kq->kq_sel, wql); kq->kq_state |= KQ_SEL; } } splx(s); return (retnum); } /*ARGSUSED*/ static int kqueue_close(struct file *fp, struct proc *p) { struct kqueue *kq = (struct kqueue *)fp->f_data; struct filedesc *fdp = p->p_fd; struct knote **knp, *kn, *kn0; int i; for (i = 0; i < fdp->fd_knlistsize; i++) { knp = &SLIST_FIRST(&fdp->fd_knlist[i]); kn = *knp; while (kn != NULL) { kn0 = SLIST_NEXT(kn, kn_link); if (kq == kn->kn_kq) { kn->kn_fop->f_detach(kn); fdrop(kn->kn_fp, p); knote_free(kn); *knp = kn0; } else { knp = &SLIST_NEXT(kn, kn_link); } kn = kn0; } } if (fdp->fd_knhashmask != 0) { for (i = 0; i < fdp->fd_knhashmask + 1; i++) { knp = &SLIST_FIRST(&fdp->fd_knhash[i]); kn = *knp; while (kn != NULL) { kn0 = SLIST_NEXT(kn, kn_link); if (kq == kn->kn_kq) { kn->kn_fop->f_detach(kn); /* XXX non-fd release of kn->kn_ptr */ knote_free(kn); *knp = kn0; } else { knp = &SLIST_NEXT(kn, kn_link); } kn = kn0; } } } _FREE(kq, M_KQUEUE); fp->f_data = NULL; return (0); } /*ARGSUSED*/ static int kqueue_kqfilter(struct file *fp, struct knote *kn, struct proc *p) { struct kqueue *kq = (struct kqueue *)kn->kn_fp->f_data; if (kn->kn_filter != EVFILT_READ || (kq->kq_state & KQ_SEL)) return (1); kn->kn_fop = &kqread_filtops; KNOTE_ATTACH(&kq->kq_sel.si_note, kn); return (0); } /*ARGSUSED*/ int kqueue_stat(struct file *fp, struct stat *st, struct proc *p) { struct kqueue *kq = (struct kqueue *)fp->f_data; bzero((void *)st, sizeof(*st)); st->st_size = kq->kq_count; st->st_blksize = sizeof(struct kevent); st->st_mode = S_IFIFO; return (0); } static void kqueue_wakeup(struct kqueue *kq) { if (kq->kq_state & KQ_SLEEP) { kq->kq_state &= ~KQ_SLEEP; wakeup(kq); } if (kq->kq_state & KQ_SEL) { // kq->kq_state &= ~KQ_SEL; /* remove for now */ selwakeup(&kq->kq_sel); } else KNOTE(&kq->kq_sel.si_note, 0); } void klist_init(struct klist *list) { SLIST_INIT(list); } /* * walk down a list of knotes, activating them if their event has triggered. */ void knote(struct klist *list, long hint) { struct knote *kn; SLIST_FOREACH(kn, list, kn_selnext) if (kn->kn_fop->f_event(kn, hint)) KNOTE_ACTIVATE(kn); } /* * attach a knote to the specified list. Return true if this is the first entry. */ int knote_attach(struct klist *list, struct knote *kn) { int ret = SLIST_EMPTY(list); SLIST_INSERT_HEAD(list, kn, kn_selnext); return ret; } /* * detach a knote from the specified list. Return true if that was the last entry. */ int knote_detach(struct klist *list, struct knote *kn) { SLIST_REMOVE(list, kn, knote, kn_selnext); return SLIST_EMPTY(list); } /* * remove all knotes from a specified klist */ void knote_remove(struct proc *p, struct klist *list) { struct knote *kn; while ((kn = SLIST_FIRST(list)) != NULL) { kn->kn_fop->f_detach(kn); knote_drop(kn, p); } } /* * remove all knotes referencing a specified fd */ void knote_fdclose(struct proc *p, int fd) { struct filedesc *fdp = p->p_fd; struct klist *list = &fdp->fd_knlist[fd]; knote_remove(p, list); } static void knote_fdpattach(struct knote *kn, struct filedesc *fdp) { struct klist *list; int size; if (! kn->kn_fop->f_isfd) { if (fdp->fd_knhashmask == 0) fdp->fd_knhash = hashinit(KN_HASHSIZE, M_KQUEUE, &fdp->fd_knhashmask); list = &fdp->fd_knhash[KN_HASH(kn->kn_id, fdp->fd_knhashmask)]; goto done; } if (fdp->fd_knlistsize <= kn->kn_id) { size = fdp->fd_knlistsize; while (size <= kn->kn_id) size += KQEXTENT; MALLOC(list, struct klist *, size * sizeof(struct klist *), M_KQUEUE, M_WAITOK); bcopy((caddr_t)fdp->fd_knlist, (caddr_t)list, fdp->fd_knlistsize * sizeof(struct klist *)); bzero((caddr_t)list + fdp->fd_knlistsize * sizeof(struct klist *), (size - fdp->fd_knlistsize) * sizeof(struct klist *)); if (fdp->fd_knlist != NULL) FREE(fdp->fd_knlist, M_KQUEUE); fdp->fd_knlistsize = size; fdp->fd_knlist = list; } list = &fdp->fd_knlist[kn->kn_id]; done: SLIST_INSERT_HEAD(list, kn, kn_link); kn->kn_status = 0; } /* * should be called at spl == 0, since we don't want to hold spl * while calling fdrop and free. */ static void knote_drop(struct knote *kn, struct proc *p) { struct filedesc *fdp = p->p_fd; struct klist *list; if (kn->kn_fop->f_isfd) list = &fdp->fd_knlist[kn->kn_id]; else list = &fdp->fd_knhash[KN_HASH(kn->kn_id, fdp->fd_knhashmask)]; SLIST_REMOVE(list, kn, knote, kn_link); if (kn->kn_status & KN_QUEUED) knote_dequeue(kn); if (kn->kn_fop->f_isfd) fdrop(kn->kn_fp, p); knote_free(kn); } static void knote_enqueue(struct knote *kn) { struct kqueue *kq = kn->kn_kq; int s = splhigh(); KASSERT((kn->kn_status & KN_QUEUED) == 0, ("knote already queued")); TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); kn->kn_status |= KN_QUEUED; kq->kq_count++; splx(s); kqueue_wakeup(kq); } static void knote_dequeue(struct knote *kn) { struct kqueue *kq = kn->kn_kq; int s = splhigh(); KASSERT(kn->kn_status & KN_QUEUED, ("knote not queued")); TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); kn->kn_status &= ~KN_QUEUED; kq->kq_count--; splx(s); } void knote_init(void) { knote_zone = zinit(sizeof(struct knote), 8192*sizeof(struct knote), 8192, "knote zone"); } SYSINIT(knote, SI_SUB_PSEUDO, SI_ORDER_ANY, knote_init, NULL) static struct knote * knote_alloc(void) { return ((struct knote *)zalloc(knote_zone)); } static void knote_free(struct knote *kn) { zfree(knote_zone, (vm_offset_t)kn); } #include #include #include #include #include #include #include #include #include int raw_usrreq(); struct pr_usrreqs event_usrreqs; struct protosw eventsw[] = { { SOCK_RAW, &systemdomain, SYSPROTO_EVENT, PR_ATOMIC, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &event_usrreqs } }; static struct kern_event_head kern_event_head; static u_long static_event_id = 0; /* * Install the protosw's for the NKE manager. Invoked at * extension load time */ int kern_event_init(void) { int retval; if ((retval = net_add_proto(eventsw, &systemdomain)) == 0) return(KERN_SUCCESS); log(LOG_WARNING, "Can't install kernel events protocol (%d)\n", retval); return(retval); } int kev_attach(struct socket *so, int proto, struct proc *p) { int error; struct kern_event_pcb *ev_pcb; error = soreserve(so, KEV_SNDSPACE, KEV_RECVSPACE); if (error) return error; ev_pcb = _MALLOC(sizeof(struct kern_event_pcb), M_PCB, M_WAITOK); if (ev_pcb == 0) return ENOBUFS; ev_pcb->ev_socket = so; ev_pcb->vendor_code_filter = 0xffffffff; so->so_pcb = (caddr_t) ev_pcb; LIST_INSERT_HEAD(&kern_event_head, ev_pcb, ev_link); return 0; } int kev_detach(struct socket *so) { struct kern_event_pcb *ev_pcb = (struct kern_event_pcb *) so->so_pcb; if (ev_pcb != 0) { LIST_REMOVE(ev_pcb, ev_link); FREE(ev_pcb, M_PCB); so->so_pcb = 0; } return 0; } int kev_post_msg(struct kev_msg *event_msg) { struct mbuf *m, *m2; struct kern_event_pcb *ev_pcb; struct kern_event_msg *ev; char *tmp; int total_size; int i; m = m_get(M_DONTWAIT, MT_DATA); if (m == 0) return ENOBUFS; ev = mtod(m, struct kern_event_msg *); total_size = KEV_MSG_HEADER_SIZE; tmp = (char *) &ev->event_data[0]; for (i = 0; i < 5; i++) { if (event_msg->dv[i].data_length == 0) break; total_size += event_msg->dv[i].data_length; bcopy(event_msg->dv[i].data_ptr, tmp, event_msg->dv[i].data_length); tmp += event_msg->dv[i].data_length; } ev->id = ++static_event_id; ev->total_size = total_size; ev->vendor_code = event_msg->vendor_code; ev->kev_class = event_msg->kev_class; ev->kev_subclass = event_msg->kev_subclass; ev->event_code = event_msg->event_code; m->m_len = total_size; for (ev_pcb = LIST_FIRST(&kern_event_head); ev_pcb; ev_pcb = LIST_NEXT(ev_pcb, ev_link)) { if (ev_pcb->vendor_code_filter != KEV_ANY_VENDOR) { if (ev_pcb->vendor_code_filter != ev->vendor_code) continue; if (ev_pcb->class_filter != KEV_ANY_CLASS) { if (ev_pcb->class_filter != ev->kev_class) continue; if ((ev_pcb->subclass_filter != KEV_ANY_SUBCLASS) && (ev_pcb->subclass_filter != ev->kev_subclass)) continue; } } m2 = m_copym(m, 0, m->m_len, M_NOWAIT); if (m2 == 0) { m_free(m); return ENOBUFS; } sbappendrecord(&ev_pcb->ev_socket->so_rcv, m2); sorwakeup(ev_pcb->ev_socket); } m_free(m); return 0; } int kev_control(so, cmd, data, ifp, p) struct socket *so; u_long cmd; caddr_t data; register struct ifnet *ifp; struct proc *p; { struct kev_request *kev_req = (struct kev_request *) data; int stat = 0; struct kern_event_pcb *ev_pcb; u_long *id_value = (u_long *) data; switch (cmd) { case SIOCGKEVID: *id_value = static_event_id; break; case SIOCSKEVFILT: ev_pcb = (struct kern_event_pcb *) so->so_pcb; ev_pcb->vendor_code_filter = kev_req->vendor_code; ev_pcb->class_filter = kev_req->kev_class; ev_pcb->subclass_filter = kev_req->kev_subclass; break; case SIOCGKEVFILT: ev_pcb = (struct kern_event_pcb *) so->so_pcb; kev_req->vendor_code = ev_pcb->vendor_code_filter; kev_req->kev_class = ev_pcb->class_filter; kev_req->kev_subclass = ev_pcb->subclass_filter; break; default: return EOPNOTSUPP; } return 0; } struct pr_usrreqs event_usrreqs = { pru_abort_notsupp, pru_accept_notsupp, kev_attach, pru_bind_notsupp, pru_connect_notsupp, pru_connect2_notsupp, kev_control, kev_detach, pru_disconnect_notsupp, pru_listen_notsupp, pru_peeraddr_notsupp, pru_rcvd_notsupp, pru_rcvoob_notsupp, pru_send_notsupp, pru_sense_null, pru_shutdown_notsupp, pru_sockaddr_notsupp, pru_sosend_notsupp, soreceive, sopoll };