159290Sjlemon/*- 272969Sjlemon * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org> 3133741Sjmg * Copyright 2004 John-Mark Gurney <jmg@FreeBSD.org> 4197240Ssson * Copyright (c) 2009 Apple, Inc. 559290Sjlemon * All rights reserved. 659290Sjlemon * 759290Sjlemon * Redistribution and use in source and binary forms, with or without 859290Sjlemon * modification, are permitted provided that the following conditions 959290Sjlemon * are met: 1059290Sjlemon * 1. Redistributions of source code must retain the above copyright 1159290Sjlemon * notice, this list of conditions and the following disclaimer. 1259290Sjlemon * 2. Redistributions in binary form must reproduce the above copyright 1359290Sjlemon * notice, this list of conditions and the following disclaimer in the 1459290Sjlemon * documentation and/or other materials provided with the distribution. 1559290Sjlemon * 1659290Sjlemon * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1759290Sjlemon * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1859290Sjlemon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1959290Sjlemon * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2059290Sjlemon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2159290Sjlemon * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2259290Sjlemon * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2359290Sjlemon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2459290Sjlemon * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2559290Sjlemon * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2659290Sjlemon * SUCH DAMAGE. 2759290Sjlemon */ 2859290Sjlemon 29116182Sobrien#include <sys/cdefs.h> 30116182Sobrien__FBSDID("$FreeBSD: stable/11/sys/kern/kern_event.c 369183 2021-01-30 23:42:30Z gbe $"); 31116182Sobrien 32162592Sjmg#include "opt_ktrace.h" 33260384Sadrian#include "opt_kqueue.h" 34162592Sjmg 3559290Sjlemon#include <sys/param.h> 3659290Sjlemon#include <sys/systm.h> 37263233Srwatson#include <sys/capsicum.h> 3859290Sjlemon#include <sys/kernel.h> 3976166Smarkm#include <sys/lock.h> 4076166Smarkm#include <sys/mutex.h> 41233505Smelifaro#include <sys/rwlock.h> 4259290Sjlemon#include <sys/proc.h> 43132138Salfred#include <sys/malloc.h> 4459290Sjlemon#include <sys/unistd.h> 4559290Sjlemon#include <sys/file.h> 46108524Salfred#include <sys/filedesc.h> 47132138Salfred#include <sys/filio.h> 4859290Sjlemon#include <sys/fcntl.h> 49133741Sjmg#include <sys/kthread.h> 5070834Swollman#include <sys/selinfo.h> 5159290Sjlemon#include <sys/queue.h> 5259290Sjlemon#include <sys/event.h> 5359290Sjlemon#include <sys/eventvar.h> 5459290Sjlemon#include <sys/poll.h> 5559290Sjlemon#include <sys/protosw.h> 56256849Skib#include <sys/resourcevar.h> 57132138Salfred#include <sys/sigio.h> 58132138Salfred#include <sys/signalvar.h> 5959290Sjlemon#include <sys/socket.h> 6059290Sjlemon#include <sys/socketvar.h> 6159290Sjlemon#include <sys/stat.h> 6284138Sjlemon#include <sys/sysctl.h> 6359290Sjlemon#include <sys/sysproto.h> 64142934Sps#include <sys/syscallsubr.h> 65133741Sjmg#include <sys/taskqueue.h> 6659290Sjlemon#include <sys/uio.h> 67271976Sjhb#include <sys/user.h> 68162592Sjmg#ifdef KTRACE 69162592Sjmg#include <sys/ktrace.h> 70162592Sjmg#endif 71310469Skib#include <machine/atomic.h> 7259290Sjlemon 7392751Sjeff#include <vm/uma.h> 7459290Sjlemon 75141616Sphkstatic MALLOC_DEFINE(M_KQUEUE, "kqueue", "memory for kqueue system"); 76141616Sphk 77133741Sjmg/* 78133741Sjmg * This lock is used if multiple kq locks are required. This possibly 79133741Sjmg * should be made into a per proc lock. 80133741Sjmg */ 81133741Sjmgstatic struct mtx kq_global; 82133741SjmgMTX_SYSINIT(kq_global, &kq_global, "kqueue order", MTX_DEF); 83133741Sjmg#define KQ_GLOBAL_LOCK(lck, haslck) do { \ 84133741Sjmg if (!haslck) \ 85133741Sjmg mtx_lock(lck); \ 86133741Sjmg haslck = 1; \ 87133741Sjmg} while (0) 88133741Sjmg#define KQ_GLOBAL_UNLOCK(lck, haslck) do { \ 89133741Sjmg if (haslck) \ 90133741Sjmg mtx_unlock(lck); \ 91133741Sjmg haslck = 0; \ 92133741Sjmg} while (0) 9384138Sjlemon 94300627SkibTASKQUEUE_DEFINE_THREAD(kqueue_ctx); 95133741Sjmg 96146950Spsstatic int kevent_copyout(void *arg, struct kevent *kevp, int count); 97146950Spsstatic int kevent_copyin(void *arg, struct kevent *kevp, int count); 98162594Sjmgstatic int kqueue_register(struct kqueue *kq, struct kevent *kev, 99162594Sjmg struct thread *td, int waitok); 100170029Srwatsonstatic int kqueue_acquire(struct file *fp, struct kqueue **kqp); 101133741Sjmgstatic void kqueue_release(struct kqueue *kq, int locked); 102286631Sedstatic void kqueue_destroy(struct kqueue *kq); 103286631Sedstatic void kqueue_drain(struct kqueue *kq, struct thread *td); 104133741Sjmgstatic int kqueue_expand(struct kqueue *kq, struct filterops *fops, 105133741Sjmg uintptr_t ident, int waitok); 106133741Sjmgstatic void kqueue_task(void *arg, int pending); 107133741Sjmgstatic int kqueue_scan(struct kqueue *kq, int maxevents, 108146950Sps struct kevent_copyops *k_ops, 109146950Sps const struct timespec *timeout, 110146950Sps struct kevent *keva, struct thread *td); 11159290Sjlemonstatic void kqueue_wakeup(struct kqueue *kq); 112133741Sjmgstatic struct filterops *kqueue_fo_find(int filt); 113133741Sjmgstatic void kqueue_fo_release(int filt); 11459290Sjlemon 115255675Srdivackystatic fo_ioctl_t kqueue_ioctl; 116255675Srdivackystatic fo_poll_t kqueue_poll; 117255675Srdivackystatic fo_kqfilter_t kqueue_kqfilter; 118255675Srdivackystatic fo_stat_t kqueue_stat; 119255675Srdivackystatic fo_close_t kqueue_close; 120271976Sjhbstatic fo_fill_kinfo_t kqueue_fill_kinfo; 121255675Srdivacky 122255675Srdivackystatic struct fileops kqueueops = { 123271489Sjhb .fo_read = invfo_rdwr, 124271489Sjhb .fo_write = invfo_rdwr, 125271489Sjhb .fo_truncate = invfo_truncate, 126116546Sphk .fo_ioctl = kqueue_ioctl, 127116546Sphk .fo_poll = kqueue_poll, 128116546Sphk .fo_kqfilter = kqueue_kqfilter, 129116546Sphk .fo_stat = kqueue_stat, 130116546Sphk .fo_close = kqueue_close, 131224914Skib .fo_chmod = invfo_chmod, 132224914Skib .fo_chown = invfo_chown, 133254356Sglebius .fo_sendfile = invfo_sendfile, 134271976Sjhb .fo_fill_kinfo = kqueue_fill_kinfo, 13572521Sjlemon}; 13672521Sjlemon 137133741Sjmgstatic int knote_attach(struct knote *kn, struct kqueue *kq); 13883366Sjulianstatic void knote_drop(struct knote *kn, struct thread *td); 13959290Sjlemonstatic void knote_enqueue(struct knote *kn); 14059290Sjlemonstatic void knote_dequeue(struct knote *kn); 14159290Sjlemonstatic void knote_init(void); 142133741Sjmgstatic struct knote *knote_alloc(int waitok); 14359290Sjlemonstatic void knote_free(struct knote *kn); 14459290Sjlemon 14572521Sjlemonstatic void filt_kqdetach(struct knote *kn); 14672521Sjlemonstatic int filt_kqueue(struct knote *kn, long hint); 14772521Sjlemonstatic int filt_procattach(struct knote *kn); 14872521Sjlemonstatic void filt_procdetach(struct knote *kn); 14972521Sjlemonstatic int filt_proc(struct knote *kn, long hint); 15072521Sjlemonstatic int filt_fileattach(struct knote *kn); 15179989Sjlemonstatic void filt_timerexpire(void *knx); 15279989Sjlemonstatic int filt_timerattach(struct knote *kn); 15379989Sjlemonstatic void filt_timerdetach(struct knote *kn); 154337418Sdabstatic void filt_timerstart(struct knote *kn, sbintime_t to); 155337418Sdabstatic void filt_timertouch(struct knote *kn, struct kevent *kev, 156337418Sdab u_long type); 157337418Sdabstatic int filt_timervalidate(struct knote *kn, sbintime_t *to); 15879989Sjlemonstatic int filt_timer(struct knote *kn, long hint); 159197241Sssonstatic int filt_userattach(struct knote *kn); 160197241Sssonstatic void filt_userdetach(struct knote *kn); 161197241Sssonstatic int filt_user(struct knote *kn, long hint); 162197294Srdivackystatic void filt_usertouch(struct knote *kn, struct kevent *kev, 163197407Srdivacky u_long type); 16472521Sjlemon 165197134Srwatsonstatic struct filterops file_filtops = { 166197134Srwatson .f_isfd = 1, 167197134Srwatson .f_attach = filt_fileattach, 168197134Srwatson}; 169197134Srwatsonstatic struct filterops kqread_filtops = { 170197134Srwatson .f_isfd = 1, 171197134Srwatson .f_detach = filt_kqdetach, 172197134Srwatson .f_event = filt_kqueue, 173197134Srwatson}; 174133741Sjmg/* XXX - move to kern_proc.c? */ 175197134Srwatsonstatic struct filterops proc_filtops = { 176197134Srwatson .f_isfd = 0, 177197134Srwatson .f_attach = filt_procattach, 178197134Srwatson .f_detach = filt_procdetach, 179197134Srwatson .f_event = filt_proc, 180197134Srwatson}; 181197134Srwatsonstatic struct filterops timer_filtops = { 182197134Srwatson .f_isfd = 0, 183197134Srwatson .f_attach = filt_timerattach, 184197134Srwatson .f_detach = filt_timerdetach, 185197134Srwatson .f_event = filt_timer, 186337418Sdab .f_touch = filt_timertouch, 187197134Srwatson}; 188197241Sssonstatic struct filterops user_filtops = { 189197241Ssson .f_attach = filt_userattach, 190197241Ssson .f_detach = filt_userdetach, 191197241Ssson .f_event = filt_user, 192197241Ssson .f_touch = filt_usertouch, 193197241Ssson}; 19472521Sjlemon 19592751Sjeffstatic uma_zone_t knote_zone; 196310469Skibstatic unsigned int kq_ncallouts = 0; 197251803Sedstatic unsigned int kq_calloutmax = 4 * 1024; 198251803SedSYSCTL_UINT(_kern, OID_AUTO, kq_calloutmax, CTLFLAG_RW, 19984138Sjlemon &kq_calloutmax, 0, "Maximum number of callouts allocated for kqueue"); 20059290Sjlemon 201133741Sjmg/* XXX - ensure not KN_INFLUX?? */ 202133741Sjmg#define KNOTE_ACTIVATE(kn, islock) do { \ 203133741Sjmg if ((islock)) \ 204133741Sjmg mtx_assert(&(kn)->kn_kq->kq_lock, MA_OWNED); \ 205133741Sjmg else \ 206133741Sjmg KQ_LOCK((kn)->kn_kq); \ 207133741Sjmg (kn)->kn_status |= KN_ACTIVE; \ 208133741Sjmg if (((kn)->kn_status & (KN_QUEUED | KN_DISABLED)) == 0) \ 209133741Sjmg knote_enqueue((kn)); \ 210133741Sjmg if (!(islock)) \ 211133741Sjmg KQ_UNLOCK((kn)->kn_kq); \ 21259290Sjlemon} while(0) 213133741Sjmg#define KQ_LOCK(kq) do { \ 214133741Sjmg mtx_lock(&(kq)->kq_lock); \ 215133741Sjmg} while (0) 216133741Sjmg#define KQ_FLUX_WAKEUP(kq) do { \ 217133741Sjmg if (((kq)->kq_state & KQ_FLUXWAIT) == KQ_FLUXWAIT) { \ 218133741Sjmg (kq)->kq_state &= ~KQ_FLUXWAIT; \ 219133741Sjmg wakeup((kq)); \ 220133741Sjmg } \ 221133741Sjmg} while (0) 222133741Sjmg#define KQ_UNLOCK_FLUX(kq) do { \ 223133741Sjmg KQ_FLUX_WAKEUP(kq); \ 224133741Sjmg mtx_unlock(&(kq)->kq_lock); \ 225133741Sjmg} while (0) 226133741Sjmg#define KQ_UNLOCK(kq) do { \ 227133741Sjmg mtx_unlock(&(kq)->kq_lock); \ 228133741Sjmg} while (0) 229133741Sjmg#define KQ_OWNED(kq) do { \ 230133741Sjmg mtx_assert(&(kq)->kq_lock, MA_OWNED); \ 231133741Sjmg} while (0) 232133741Sjmg#define KQ_NOTOWNED(kq) do { \ 233133741Sjmg mtx_assert(&(kq)->kq_lock, MA_NOTOWNED); \ 234133741Sjmg} while (0) 235302235Skib 236302235Skibstatic struct knlist * 237302235Skibkn_list_lock(struct knote *kn) 238302235Skib{ 239302235Skib struct knlist *knl; 240302235Skib 241302235Skib knl = kn->kn_knlist; 242302235Skib if (knl != NULL) 243302235Skib knl->kl_lock(knl->kl_lockarg); 244302235Skib return (knl); 245302235Skib} 246302235Skib 247302235Skibstatic void 248302235Skibkn_list_unlock(struct knlist *knl) 249302235Skib{ 250302235Skib bool do_free; 251302235Skib 252302235Skib if (knl == NULL) 253302235Skib return; 254302235Skib do_free = knl->kl_autodestroy && knlist_empty(knl); 255302235Skib knl->kl_unlock(knl->kl_lockarg); 256302235Skib if (do_free) { 257302235Skib knlist_destroy(knl); 258302235Skib free(knl, M_KQUEUE); 259302235Skib } 260302235Skib} 261302235Skib 262147730Sssouhlal#define KNL_ASSERT_LOCK(knl, islocked) do { \ 263147730Sssouhlal if (islocked) \ 264147730Sssouhlal KNL_ASSERT_LOCKED(knl); \ 265147730Sssouhlal else \ 266147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); \ 267147730Sssouhlal} while (0) 268147730Sssouhlal#ifdef INVARIANTS 269147730Sssouhlal#define KNL_ASSERT_LOCKED(knl) do { \ 270193951Skib knl->kl_assert_locked((knl)->kl_lockarg); \ 271147730Sssouhlal} while (0) 272193951Skib#define KNL_ASSERT_UNLOCKED(knl) do { \ 273193951Skib knl->kl_assert_unlocked((knl)->kl_lockarg); \ 274147730Sssouhlal} while (0) 275147730Sssouhlal#else /* !INVARIANTS */ 276147730Sssouhlal#define KNL_ASSERT_LOCKED(knl) do {} while(0) 277147730Sssouhlal#define KNL_ASSERT_UNLOCKED(knl) do {} while (0) 278147730Sssouhlal#endif /* INVARIANTS */ 27959290Sjlemon 280260384Sadrian#ifndef KN_HASHSIZE 28159290Sjlemon#define KN_HASHSIZE 64 /* XXX should be tunable */ 282260384Sadrian#endif 283260384Sadrian 28459290Sjlemon#define KN_HASH(val, mask) (((val) ^ (val >> 8)) & (mask)) 28559290Sjlemon 28688633Salfredstatic int 28788633Salfredfilt_nullattach(struct knote *kn) 28888633Salfred{ 28988633Salfred 29088633Salfred return (ENXIO); 29188633Salfred}; 29288633Salfred 293197134Srwatsonstruct filterops null_filtops = { 294197134Srwatson .f_isfd = 0, 295197134Srwatson .f_attach = filt_nullattach, 296197134Srwatson}; 29788633Salfred 298133741Sjmg/* XXX - make SYSINIT to add these, and move into respective modules. */ 29959290Sjlemonextern struct filterops sig_filtops; 300131562Salfredextern struct filterops fs_filtops; 30159290Sjlemon 30259290Sjlemon/* 30372521Sjlemon * Table for for all system-defined filters. 30459290Sjlemon */ 305133741Sjmgstatic struct mtx filterops_lock; 306133741SjmgMTX_SYSINIT(kqueue_filterops, &filterops_lock, "protect sysfilt_ops", 307133741Sjmg MTX_DEF); 308133741Sjmgstatic struct { 309133741Sjmg struct filterops *for_fop; 310274560Sjmg int for_nolock; 311133741Sjmg int for_refcnt; 312133741Sjmg} sysfilt_ops[EVFILT_SYSCOUNT] = { 313274560Sjmg { &file_filtops, 1 }, /* EVFILT_READ */ 314274560Sjmg { &file_filtops, 1 }, /* EVFILT_WRITE */ 315133741Sjmg { &null_filtops }, /* EVFILT_AIO */ 316274560Sjmg { &file_filtops, 1 }, /* EVFILT_VNODE */ 317274560Sjmg { &proc_filtops, 1 }, /* EVFILT_PROC */ 318274560Sjmg { &sig_filtops, 1 }, /* EVFILT_SIGNAL */ 319274560Sjmg { &timer_filtops, 1 }, /* EVFILT_TIMER */ 320274560Sjmg { &file_filtops, 1 }, /* EVFILT_PROCDESC */ 321274560Sjmg { &fs_filtops, 1 }, /* EVFILT_FS */ 322151260Sambrisko { &null_filtops }, /* EVFILT_LIO */ 323274560Sjmg { &user_filtops, 1 }, /* EVFILT_USER */ 324260805Sadrian { &null_filtops }, /* EVFILT_SENDFILE */ 32559290Sjlemon}; 32659290Sjlemon 327133741Sjmg/* 328133741Sjmg * Simple redirection for all cdevsw style objects to call their fo_kqfilter 329133741Sjmg * method. 330133741Sjmg */ 33159290Sjlemonstatic int 33272521Sjlemonfilt_fileattach(struct knote *kn) 33359290Sjlemon{ 334133635Sjmg 33572521Sjlemon return (fo_kqfilter(kn->kn_fp, kn)); 33659290Sjlemon} 33759290Sjlemon 33872521Sjlemon/*ARGSUSED*/ 339255675Srdivackystatic int 34072521Sjlemonkqueue_kqfilter(struct file *fp, struct knote *kn) 34159290Sjlemon{ 342109153Sdillon struct kqueue *kq = kn->kn_fp->f_data; 34359290Sjlemon 34472521Sjlemon if (kn->kn_filter != EVFILT_READ) 345133741Sjmg return (EINVAL); 34659290Sjlemon 347133741Sjmg kn->kn_status |= KN_KQUEUE; 34872521Sjlemon kn->kn_fop = &kqread_filtops; 349133741Sjmg knlist_add(&kq->kq_sel.si_note, kn, 0); 350133741Sjmg 35159290Sjlemon return (0); 35259290Sjlemon} 35359290Sjlemon 35459290Sjlemonstatic void 35559290Sjlemonfilt_kqdetach(struct knote *kn) 35659290Sjlemon{ 357109153Sdillon struct kqueue *kq = kn->kn_fp->f_data; 35859290Sjlemon 359133741Sjmg knlist_remove(&kq->kq_sel.si_note, kn, 0); 36059290Sjlemon} 36159290Sjlemon 36259290Sjlemon/*ARGSUSED*/ 36359290Sjlemonstatic int 36459290Sjlemonfilt_kqueue(struct knote *kn, long hint) 36559290Sjlemon{ 366109153Sdillon struct kqueue *kq = kn->kn_fp->f_data; 36759290Sjlemon 36859290Sjlemon kn->kn_data = kq->kq_count; 36959290Sjlemon return (kn->kn_data > 0); 37059290Sjlemon} 37159290Sjlemon 372133741Sjmg/* XXX - move to kern_proc.c? */ 37359290Sjlemonstatic int 37459290Sjlemonfilt_procattach(struct knote *kn) 37559290Sjlemon{ 37659290Sjlemon struct proc *p; 37775451Srwatson int error; 378302235Skib bool exiting, immediate; 37959290Sjlemon 380302235Skib exiting = immediate = false; 38159290Sjlemon p = pfind(kn->kn_id); 382113377Skbyanc if (p == NULL && (kn->kn_sfflags & NOTE_EXIT)) { 383113377Skbyanc p = zpfind(kn->kn_id); 384302235Skib exiting = true; 385133741Sjmg } else if (p != NULL && (p->p_flag & P_WEXIT)) { 386302235Skib exiting = true; 387113377Skbyanc } 388133741Sjmg 389122019Scognet if (p == NULL) 390122019Scognet return (ESRCH); 391203875Skib if ((error = p_cansee(curthread, p))) { 392203875Skib PROC_UNLOCK(p); 39375451Srwatson return (error); 394203875Skib } 39559290Sjlemon 39659290Sjlemon kn->kn_ptr.p_proc = p; 39759290Sjlemon kn->kn_flags |= EV_CLEAR; /* automatically set */ 39859290Sjlemon 39959290Sjlemon /* 400295012Svangyzen * Internal flag indicating registration done by kernel for the 401295012Svangyzen * purposes of getting a NOTE_CHILD notification. 40259290Sjlemon */ 403295012Svangyzen if (kn->kn_flags & EV_FLAG2) { 404295012Svangyzen kn->kn_flags &= ~EV_FLAG2; 40559290Sjlemon kn->kn_data = kn->kn_sdata; /* ppid */ 40659290Sjlemon kn->kn_fflags = NOTE_CHILD; 407302235Skib kn->kn_sfflags &= ~(NOTE_EXIT | NOTE_EXEC | NOTE_FORK); 408302235Skib immediate = true; /* Force immediate activation of child note. */ 409295012Svangyzen } 410295012Svangyzen /* 411295012Svangyzen * Internal flag indicating registration done by kernel (for other than 412295012Svangyzen * NOTE_CHILD). 413295012Svangyzen */ 414295012Svangyzen if (kn->kn_flags & EV_FLAG1) { 41559290Sjlemon kn->kn_flags &= ~EV_FLAG1; 41659290Sjlemon } 41759290Sjlemon 418302235Skib knlist_add(p->p_klist, kn, 1); 419113377Skbyanc 420113377Skbyanc /* 421295012Svangyzen * Immediately activate any child notes or, in the case of a zombie 422295012Svangyzen * target process, exit notes. The latter is necessary to handle the 423295012Svangyzen * case where the target process, e.g. a child, dies before the kevent 424295012Svangyzen * is registered. 425113377Skbyanc */ 426302235Skib if (immediate || (exiting && filt_proc(kn, NOTE_EXIT))) 427133741Sjmg KNOTE_ACTIVATE(kn, 0); 428113377Skbyanc 42971500Sjhb PROC_UNLOCK(p); 43059290Sjlemon 43159290Sjlemon return (0); 43259290Sjlemon} 43359290Sjlemon 43459290Sjlemon/* 43559290Sjlemon * The knote may be attached to a different process, which may exit, 43659290Sjlemon * leaving nothing for the knote to be attached to. So when the process 43759290Sjlemon * exits, the knote is marked as DETACHED and also flagged as ONESHOT so 43859290Sjlemon * it will be deleted when read out. However, as part of the knote deletion, 43959290Sjlemon * this routine is called, so a check is needed to avoid actually performing 44059290Sjlemon * a detach, because the original process does not exist any more. 44159290Sjlemon */ 442133741Sjmg/* XXX - move to kern_proc.c? */ 44359290Sjlemonstatic void 44459290Sjlemonfilt_procdetach(struct knote *kn) 44559290Sjlemon{ 44659290Sjlemon 447302235Skib knlist_remove(kn->kn_knlist, kn, 0); 448133741Sjmg kn->kn_ptr.p_proc = NULL; 44959290Sjlemon} 45059290Sjlemon 451133741Sjmg/* XXX - move to kern_proc.c? */ 45259290Sjlemonstatic int 45359290Sjlemonfilt_proc(struct knote *kn, long hint) 45459290Sjlemon{ 455264231Sed struct proc *p; 45659290Sjlemon u_int event; 45759290Sjlemon 458264231Sed p = kn->kn_ptr.p_proc; 459302308Skib if (p == NULL) /* already activated, from attach filter */ 460302308Skib return (0); 461302308Skib 462264231Sed /* Mask off extra data. */ 46359290Sjlemon event = (u_int)hint & NOTE_PCTRLMASK; 46459290Sjlemon 465264231Sed /* If the user is interested in this event, record it. */ 46659290Sjlemon if (kn->kn_sfflags & event) 46759290Sjlemon kn->kn_fflags |= event; 46859290Sjlemon 469264231Sed /* Process is gone, so flag the event as finished. */ 47059290Sjlemon if (event == NOTE_EXIT) { 471264231Sed kn->kn_flags |= EV_EOF | EV_ONESHOT; 472133741Sjmg kn->kn_ptr.p_proc = NULL; 473254072Sjhb if (kn->kn_fflags & NOTE_EXIT) 474285670Skib kn->kn_data = KW_EXITCODE(p->p_xexit, p->p_xsig); 475254072Sjhb if (kn->kn_fflags == 0) 476254072Sjhb kn->kn_flags |= EV_DROP; 47759290Sjlemon return (1); 47859290Sjlemon } 47959290Sjlemon 480180340Skib return (kn->kn_fflags != 0); 481180340Skib} 48259290Sjlemon 483180340Skib/* 484180340Skib * Called when the process forked. It mostly does the same as the 485180340Skib * knote(), activating all knotes registered to be activated when the 486180340Skib * process forked. Additionally, for each knote attached to the 487180340Skib * parent, check whether user wants to track the new process. If so 488180340Skib * attach a new knote to it, and immediately report an event with the 489180340Skib * child's pid. 490180340Skib */ 491180340Skibvoid 492180340Skibknote_fork(struct knlist *list, int pid) 493180340Skib{ 494180340Skib struct kqueue *kq; 495180340Skib struct knote *kn; 496180340Skib struct kevent kev; 497180340Skib int error; 498180340Skib 499180340Skib if (list == NULL) 500180340Skib return; 501341076Smarkj 502341076Smarkj memset(&kev, 0, sizeof(kev)); 503180340Skib list->kl_lock(list->kl_lockarg); 504180340Skib SLIST_FOREACH(kn, &list->kl_list, kn_selnext) { 505180340Skib kq = kn->kn_kq; 506180340Skib KQ_LOCK(kq); 507264146Skib if ((kn->kn_status & (KN_INFLUX | KN_SCAN)) == KN_INFLUX) { 508180340Skib KQ_UNLOCK(kq); 509180340Skib continue; 510180340Skib } 511180340Skib 51259290Sjlemon /* 513180340Skib * The same as knote(), activate the event. 51459290Sjlemon */ 515180340Skib if ((kn->kn_sfflags & NOTE_TRACK) == 0) { 516180340Skib kn->kn_status |= KN_HASKQLOCK; 517254287Sjhb if (kn->kn_fop->f_event(kn, NOTE_FORK)) 518180340Skib KNOTE_ACTIVATE(kn, 1); 519180340Skib kn->kn_status &= ~KN_HASKQLOCK; 520180340Skib KQ_UNLOCK(kq); 521180340Skib continue; 522180340Skib } 523180340Skib 524180340Skib /* 525180340Skib * The NOTE_TRACK case. In addition to the activation 526295012Svangyzen * of the event, we need to register new events to 527180340Skib * track the child. Drop the locks in preparation for 528180340Skib * the call to kqueue_register(). 529180340Skib */ 530180340Skib kn->kn_status |= KN_INFLUX; 531180340Skib KQ_UNLOCK(kq); 532180340Skib list->kl_unlock(list->kl_lockarg); 533180340Skib 534180340Skib /* 535295012Svangyzen * Activate existing knote and register tracking knotes with 536180340Skib * new process. 537295012Svangyzen * 538295012Svangyzen * First register a knote to get just the child notice. This 539295012Svangyzen * must be a separate note from a potential NOTE_EXIT 540295012Svangyzen * notification since both NOTE_CHILD and NOTE_EXIT are defined 541295012Svangyzen * to use the data field (in conflicting ways). 542180340Skib */ 543180340Skib kev.ident = pid; 54459290Sjlemon kev.filter = kn->kn_filter; 545302235Skib kev.flags = kn->kn_flags | EV_ADD | EV_ENABLE | EV_ONESHOT | 546302235Skib EV_FLAG2; 547295012Svangyzen kev.fflags = kn->kn_sfflags; 548295012Svangyzen kev.data = kn->kn_id; /* parent */ 549295012Svangyzen kev.udata = kn->kn_kevent.udata;/* preserve udata */ 550295012Svangyzen error = kqueue_register(kq, &kev, NULL, 0); 551295012Svangyzen if (error) 552295012Svangyzen kn->kn_fflags |= NOTE_TRACKERR; 553295012Svangyzen 554295012Svangyzen /* 555295012Svangyzen * Then register another knote to track other potential events 556295012Svangyzen * from the new process. 557295012Svangyzen */ 558295012Svangyzen kev.ident = pid; 559295012Svangyzen kev.filter = kn->kn_filter; 56059290Sjlemon kev.flags = kn->kn_flags | EV_ADD | EV_ENABLE | EV_FLAG1; 56159290Sjlemon kev.fflags = kn->kn_sfflags; 562180340Skib kev.data = kn->kn_id; /* parent */ 563180340Skib kev.udata = kn->kn_kevent.udata;/* preserve udata */ 564180340Skib error = kqueue_register(kq, &kev, NULL, 0); 56559290Sjlemon if (error) 56659290Sjlemon kn->kn_fflags |= NOTE_TRACKERR; 567254287Sjhb if (kn->kn_fop->f_event(kn, NOTE_FORK)) 568254287Sjhb KNOTE_ACTIVATE(kn, 0); 569341078Smarkj list->kl_lock(list->kl_lockarg); 570180340Skib KQ_LOCK(kq); 571180340Skib kn->kn_status &= ~KN_INFLUX; 572180340Skib KQ_UNLOCK_FLUX(kq); 57359290Sjlemon } 574180340Skib list->kl_unlock(list->kl_lockarg); 57559290Sjlemon} 57659290Sjlemon 577238424Sjhb/* 578238424Sjhb * XXX: EVFILT_TIMER should perhaps live in kern_time.c beside the 579238424Sjhb * interval timer support code. 580238424Sjhb */ 581268843Sbapt 582320290Skib#define NOTE_TIMER_PRECMASK \ 583320290Skib (NOTE_SECONDS | NOTE_MSECONDS | NOTE_USECONDS | NOTE_NSECONDS) 584268843Sbapt 585296775Sgibbsstatic sbintime_t 586268843Sbapttimer2sbintime(intptr_t data, int flags) 587133741Sjmg{ 588320290Skib int64_t secs; 589259633Sse 590296775Sgibbs /* 591296775Sgibbs * Macros for converting to the fractional second portion of an 592296775Sgibbs * sbintime_t using 64bit multiplication to improve precision. 593296775Sgibbs */ 594296775Sgibbs#define NS_TO_SBT(ns) (((ns) * (((uint64_t)1 << 63) / 500000000)) >> 32) 595296775Sgibbs#define US_TO_SBT(us) (((us) * (((uint64_t)1 << 63) / 500000)) >> 32) 596296775Sgibbs#define MS_TO_SBT(ms) (((ms) * (((uint64_t)1 << 63) / 500)) >> 32) 597268843Sbapt switch (flags & NOTE_TIMER_PRECMASK) { 598268843Sbapt case NOTE_SECONDS: 599296775Sgibbs#ifdef __LP64__ 600296775Sgibbs if (data > (SBT_MAX / SBT_1S)) 601311006Skib return (SBT_MAX); 602296775Sgibbs#endif 603296775Sgibbs return ((sbintime_t)data << 32); 604268843Sbapt case NOTE_MSECONDS: /* FALLTHROUGH */ 605268843Sbapt case 0: 606296775Sgibbs if (data >= 1000) { 607320290Skib secs = data / 1000; 608296775Sgibbs#ifdef __LP64__ 609296775Sgibbs if (secs > (SBT_MAX / SBT_1S)) 610311006Skib return (SBT_MAX); 611296775Sgibbs#endif 612296775Sgibbs return (secs << 32 | MS_TO_SBT(data % 1000)); 613296775Sgibbs } 614320290Skib return (MS_TO_SBT(data)); 615268843Sbapt case NOTE_USECONDS: 616296775Sgibbs if (data >= 1000000) { 617320290Skib secs = data / 1000000; 618296775Sgibbs#ifdef __LP64__ 619296775Sgibbs if (secs > (SBT_MAX / SBT_1S)) 620311006Skib return (SBT_MAX); 621296775Sgibbs#endif 622296775Sgibbs return (secs << 32 | US_TO_SBT(data % 1000000)); 623296775Sgibbs } 624320290Skib return (US_TO_SBT(data)); 625268843Sbapt case NOTE_NSECONDS: 626296775Sgibbs if (data >= 1000000000) { 627320290Skib secs = data / 1000000000; 628296775Sgibbs#ifdef __LP64__ 629296775Sgibbs if (secs > (SBT_MAX / SBT_1S)) 630311006Skib return (SBT_MAX); 631296775Sgibbs#endif 632369183Sgbe return (secs << 32 | NS_TO_SBT(data % 1000000000)); 633296775Sgibbs } 634311006Skib return (NS_TO_SBT(data)); 635296775Sgibbs default: 636268843Sbapt break; 637268843Sbapt } 638296775Sgibbs return (-1); 639133741Sjmg} 640133741Sjmg 641311007Skibstruct kq_timer_cb_data { 642311007Skib struct callout c; 643311007Skib sbintime_t next; /* next timer event fires at */ 644311007Skib sbintime_t to; /* precalculated timer period */ 645311007Skib}; 646311007Skib 64779989Sjlemonstatic void 64879989Sjlemonfilt_timerexpire(void *knx) 64979989Sjlemon{ 650247804Sdavide struct knote *kn; 651311007Skib struct kq_timer_cb_data *kc; 65279989Sjlemon 653247804Sdavide kn = knx; 65479989Sjlemon kn->kn_data++; 655133741Sjmg KNOTE_ACTIVATE(kn, 0); /* XXX - handle locking */ 65679989Sjlemon 657311007Skib if ((kn->kn_flags & EV_ONESHOT) != 0) 658311007Skib return; 659311007Skib 660311007Skib kc = kn->kn_ptr.p_v; 661311007Skib kc->next += kc->to; 662311007Skib callout_reset_sbt_on(&kc->c, kc->next, 0, filt_timerexpire, kn, 663311007Skib PCPU_GET(cpuid), C_ABSOLUTE); 66479989Sjlemon} 66579989Sjlemon 66679989Sjlemon/* 667268843Sbapt * data contains amount of time to sleep 668133590Srwatson */ 66979989Sjlemonstatic int 670337418Sdabfilt_timervalidate(struct knote *kn, sbintime_t *to) 67179989Sjlemon{ 67279989Sjlemon 673311007Skib if (kn->kn_sdata < 0) 674255882Skib return (EINVAL); 675311007Skib if (kn->kn_sdata == 0 && (kn->kn_flags & EV_ONESHOT) == 0) 676255882Skib kn->kn_sdata = 1; 677337418Sdab /* 678337418Sdab * The only fflags values supported are the timer unit 679337418Sdab * (precision) and the absolute time indicator. 680337418Sdab */ 681311007Skib if ((kn->kn_sfflags & ~NOTE_TIMER_PRECMASK) != 0) 682268843Sbapt return (EINVAL); 683268843Sbapt 684337418Sdab *to = timer2sbintime(kn->kn_sdata, kn->kn_sfflags); 685337418Sdab if (*to < 0) 686255882Skib return (EINVAL); 687337418Sdab return (0); 688337418Sdab} 689255882Skib 690337418Sdabstatic int 691337418Sdabfilt_timerattach(struct knote *kn) 692337418Sdab{ 693337418Sdab struct kq_timer_cb_data *kc; 694337418Sdab sbintime_t to; 695337418Sdab unsigned int ncallouts; 696337418Sdab int error; 697337418Sdab 698337418Sdab error = filt_timervalidate(kn, &to); 699337418Sdab if (error != 0) 700337418Sdab return (error); 701337418Sdab 702251803Sed do { 703310469Skib ncallouts = kq_ncallouts; 704251803Sed if (ncallouts >= kq_calloutmax) 705251803Sed return (ENOMEM); 706310469Skib } while (!atomic_cmpset_int(&kq_ncallouts, ncallouts, ncallouts + 1)); 707133741Sjmg 70879989Sjlemon kn->kn_flags |= EV_CLEAR; /* automatically set */ 709254932Sjmg kn->kn_status &= ~KN_DETACHED; /* knlist_add clears it */ 710311007Skib kn->kn_ptr.p_v = kc = malloc(sizeof(*kc), M_KQUEUE, M_WAITOK); 711311007Skib callout_init(&kc->c, 1); 712337418Sdab filt_timerstart(kn, to); 713337418Sdab 714337418Sdab return (0); 715337418Sdab} 716337418Sdab 717337418Sdabstatic void 718337418Sdabfilt_timerstart(struct knote *kn, sbintime_t to) 719337418Sdab{ 720337418Sdab struct kq_timer_cb_data *kc; 721337418Sdab 722337418Sdab kc = kn->kn_ptr.p_v; 723311007Skib kc->next = to + sbinuptime(); 724311007Skib kc->to = to; 725311007Skib callout_reset_sbt_on(&kc->c, kc->next, 0, filt_timerexpire, kn, 726311007Skib PCPU_GET(cpuid), C_ABSOLUTE); 72779989Sjlemon} 72879989Sjlemon 72979989Sjlemonstatic void 73079989Sjlemonfilt_timerdetach(struct knote *kn) 73179989Sjlemon{ 732311007Skib struct kq_timer_cb_data *kc; 733251803Sed unsigned int old; 73479989Sjlemon 735311007Skib kc = kn->kn_ptr.p_v; 736311007Skib callout_drain(&kc->c); 737311007Skib free(kc, M_KQUEUE); 738310469Skib old = atomic_fetchadd_int(&kq_ncallouts, -1); 739251803Sed KASSERT(old > 0, ("Number of callouts cannot become negative")); 740254932Sjmg kn->kn_status |= KN_DETACHED; /* knlist_remove sets it */ 74179989Sjlemon} 74279989Sjlemon 743337418Sdabstatic void 744337418Sdabfilt_timertouch(struct knote *kn, struct kevent *kev, u_long type) 745337418Sdab{ 746337418Sdab struct kq_timer_cb_data *kc; 747337418Sdab struct kqueue *kq; 748337418Sdab sbintime_t to; 749337418Sdab int error; 750337418Sdab 751337418Sdab switch (type) { 752337418Sdab case EVENT_REGISTER: 753337418Sdab /* Handle re-added timers that update data/fflags */ 754337418Sdab if (kev->flags & EV_ADD) { 755337418Sdab kc = kn->kn_ptr.p_v; 756337418Sdab 757337418Sdab /* Drain any existing callout. */ 758337418Sdab callout_drain(&kc->c); 759337418Sdab 760337418Sdab /* Throw away any existing undelivered record 761337418Sdab * of the timer expiration. This is done under 762337418Sdab * the presumption that if a process is 763337418Sdab * re-adding this timer with new parameters, 764337418Sdab * it is no longer interested in what may have 765337418Sdab * happened under the old parameters. If it is 766337418Sdab * interested, it can wait for the expiration, 767337418Sdab * delete the old timer definition, and then 768337418Sdab * add the new one. 769337418Sdab * 770337418Sdab * This has to be done while the kq is locked: 771337418Sdab * - if enqueued, dequeue 772337418Sdab * - make it no longer active 773337418Sdab * - clear the count of expiration events 774337418Sdab */ 775337418Sdab kq = kn->kn_kq; 776337418Sdab KQ_LOCK(kq); 777337418Sdab if (kn->kn_status & KN_QUEUED) 778337418Sdab knote_dequeue(kn); 779337418Sdab 780337418Sdab kn->kn_status &= ~KN_ACTIVE; 781337418Sdab kn->kn_data = 0; 782337418Sdab KQ_UNLOCK(kq); 783337418Sdab 784337418Sdab /* Reschedule timer based on new data/fflags */ 785337418Sdab kn->kn_sfflags = kev->fflags; 786337418Sdab kn->kn_sdata = kev->data; 787337418Sdab error = filt_timervalidate(kn, &to); 788337418Sdab if (error != 0) { 789337418Sdab kn->kn_flags |= EV_ERROR; 790337418Sdab kn->kn_data = error; 791337418Sdab } else 792337418Sdab filt_timerstart(kn, to); 793337418Sdab } 794337418Sdab break; 795337418Sdab 796337418Sdab case EVENT_PROCESS: 797337418Sdab *kev = kn->kn_kevent; 798337418Sdab if (kn->kn_flags & EV_CLEAR) { 799337418Sdab kn->kn_data = 0; 800337418Sdab kn->kn_fflags = 0; 801337418Sdab } 802337418Sdab break; 803337418Sdab 804337418Sdab default: 805337418Sdab panic("filt_timertouch() - invalid type (%ld)", type); 806337418Sdab break; 807337418Sdab } 808337418Sdab} 809337418Sdab 81079989Sjlemonstatic int 81179989Sjlemonfilt_timer(struct knote *kn, long hint) 81279989Sjlemon{ 81379989Sjlemon 81479989Sjlemon return (kn->kn_data != 0); 81579989Sjlemon} 81679989Sjlemon 817197241Sssonstatic int 818197241Sssonfilt_userattach(struct knote *kn) 819197241Ssson{ 820197241Ssson 821197241Ssson /* 822197241Ssson * EVFILT_USER knotes are not attached to anything in the kernel. 823197241Ssson */ 824197241Ssson kn->kn_hook = NULL; 825197241Ssson if (kn->kn_fflags & NOTE_TRIGGER) 826197241Ssson kn->kn_hookid = 1; 827197241Ssson else 828197241Ssson kn->kn_hookid = 0; 829197241Ssson return (0); 830197241Ssson} 831197241Ssson 832197241Sssonstatic void 833197241Sssonfilt_userdetach(__unused struct knote *kn) 834197241Ssson{ 835197241Ssson 836197241Ssson /* 837197241Ssson * EVFILT_USER knotes are not attached to anything in the kernel. 838197241Ssson */ 839197241Ssson} 840197241Ssson 841197241Sssonstatic int 842197241Sssonfilt_user(struct knote *kn, __unused long hint) 843197241Ssson{ 844197241Ssson 845197241Ssson return (kn->kn_hookid); 846197241Ssson} 847197241Ssson 848197241Sssonstatic void 849197407Srdivackyfilt_usertouch(struct knote *kn, struct kevent *kev, u_long type) 850197241Ssson{ 851197407Srdivacky u_int ffctrl; 852197241Ssson 853197241Ssson switch (type) { 854197241Ssson case EVENT_REGISTER: 855197241Ssson if (kev->fflags & NOTE_TRIGGER) 856197241Ssson kn->kn_hookid = 1; 857197241Ssson 858197241Ssson ffctrl = kev->fflags & NOTE_FFCTRLMASK; 859197241Ssson kev->fflags &= NOTE_FFLAGSMASK; 860197241Ssson switch (ffctrl) { 861197241Ssson case NOTE_FFNOP: 862197241Ssson break; 863197241Ssson 864197241Ssson case NOTE_FFAND: 865197241Ssson kn->kn_sfflags &= kev->fflags; 866197241Ssson break; 867197241Ssson 868197241Ssson case NOTE_FFOR: 869197241Ssson kn->kn_sfflags |= kev->fflags; 870197241Ssson break; 871197241Ssson 872197241Ssson case NOTE_FFCOPY: 873197241Ssson kn->kn_sfflags = kev->fflags; 874197241Ssson break; 875197241Ssson 876197241Ssson default: 877197241Ssson /* XXX Return error? */ 878197241Ssson break; 879197241Ssson } 880197241Ssson kn->kn_sdata = kev->data; 881197241Ssson if (kev->flags & EV_CLEAR) { 882197241Ssson kn->kn_hookid = 0; 883197241Ssson kn->kn_data = 0; 884197241Ssson kn->kn_fflags = 0; 885197241Ssson } 886197241Ssson break; 887197241Ssson 888197241Ssson case EVENT_PROCESS: 889197241Ssson *kev = kn->kn_kevent; 890197241Ssson kev->fflags = kn->kn_sfflags; 891197241Ssson kev->data = kn->kn_sdata; 892197241Ssson if (kn->kn_flags & EV_CLEAR) { 893197241Ssson kn->kn_hookid = 0; 894197241Ssson kn->kn_data = 0; 895197241Ssson kn->kn_fflags = 0; 896197241Ssson } 897197241Ssson break; 898197241Ssson 899197241Ssson default: 900197241Ssson panic("filt_usertouch() - invalid type (%ld)", type); 901197241Ssson break; 902197241Ssson } 903197241Ssson} 904197241Ssson 90561468Sjlemonint 906225617Skmacysys_kqueue(struct thread *td, struct kqueue_args *uap) 90759290Sjlemon{ 908283440Sdchagin 909286309Sed return (kern_kqueue(td, 0, NULL)); 910283440Sdchagin} 911283440Sdchagin 912286631Sedstatic void 913286631Sedkqueue_init(struct kqueue *kq) 914286631Sed{ 915286631Sed 916286631Sed mtx_init(&kq->kq_lock, "kqueue", NULL, MTX_DEF | MTX_DUPOK); 917286631Sed TAILQ_INIT(&kq->kq_head); 918286631Sed knlist_init_mtx(&kq->kq_sel.si_note, &kq->kq_lock); 919286631Sed TASK_INIT(&kq->kq_task, 0, kqueue_task, kq); 920286631Sed} 921286631Sed 922283440Sdchaginint 923286309Sedkern_kqueue(struct thread *td, int flags, struct filecaps *fcaps) 924283440Sdchagin{ 925255675Srdivacky struct filedesc *fdp; 926255675Srdivacky struct kqueue *kq; 927255675Srdivacky struct file *fp; 928256849Skib struct ucred *cred; 929255675Srdivacky int fd, error; 930255675Srdivacky 931288145Smjg fdp = td->td_proc->p_fd; 932256849Skib cred = td->td_ucred; 933288145Smjg if (!chgkqcnt(cred->cr_ruidinfo, 1, lim_cur(td, RLIMIT_KQUEUES))) 934257597Sjilles return (ENOMEM); 935256849Skib 936286309Sed error = falloc_caps(td, &fp, &fd, flags, fcaps); 937288145Smjg if (error != 0) { 938288145Smjg chgkqcnt(cred->cr_ruidinfo, -1, 0); 939288145Smjg return (error); 940288145Smjg } 941255675Srdivacky 942255675Srdivacky /* An extra reference on `fp' has been held for us by falloc(). */ 943255675Srdivacky kq = malloc(sizeof *kq, M_KQUEUE, M_WAITOK | M_ZERO); 944286631Sed kqueue_init(kq); 945255675Srdivacky kq->kq_fdp = fdp; 946288145Smjg kq->kq_cred = crhold(cred); 947255675Srdivacky 948255675Srdivacky FILEDESC_XLOCK(fdp); 949255675Srdivacky TAILQ_INSERT_HEAD(&fdp->fd_kqlist, kq, kq_list); 950255675Srdivacky FILEDESC_XUNLOCK(fdp); 951255675Srdivacky 952255675Srdivacky finit(fp, FREAD | FWRITE, DTYPE_KQUEUE, kq, &kqueueops); 953255675Srdivacky fdrop(fp, td); 954255675Srdivacky 955255675Srdivacky td->td_retval[0] = fd; 956288145Smjg return (0); 95759290Sjlemon} 95859290Sjlemon 95959290Sjlemon#ifndef _SYS_SYSPROTO_H_ 96059290Sjlemonstruct kevent_args { 96159290Sjlemon int fd; 96263977Speter const struct kevent *changelist; 96359290Sjlemon int nchanges; 96463452Sjlemon struct kevent *eventlist; 96559290Sjlemon int nevents; 96663977Speter const struct timespec *timeout; 96759290Sjlemon}; 96859290Sjlemon#endif 96959290Sjlemonint 970225617Skmacysys_kevent(struct thread *td, struct kevent_args *uap) 97159290Sjlemon{ 972142934Sps struct timespec ts, *tsp; 973315471Skib struct kevent_copyops k_ops = { 974315471Skib .arg = uap, 975315471Skib .k_copyout = kevent_copyout, 976315471Skib .k_copyin = kevent_copyin, 977315471Skib }; 978162592Sjmg#ifdef KTRACE 979328454Sjhb struct kevent *eventlist = uap->eventlist; 980162592Sjmg#endif 981328454Sjhb int error; 982142934Sps 983142934Sps if (uap->timeout != NULL) { 984142934Sps error = copyin(uap->timeout, &ts, sizeof(ts)); 985142934Sps if (error) 986142934Sps return (error); 987142934Sps tsp = &ts; 988142934Sps } else 989142934Sps tsp = NULL; 990142934Sps 991162592Sjmg#ifdef KTRACE 992328454Sjhb if (KTRPOINT(td, KTR_STRUCT_ARRAY)) 993328454Sjhb ktrstructarray("kevent", UIO_USERSPACE, uap->changelist, 994328454Sjhb uap->nchanges, sizeof(struct kevent)); 995162592Sjmg#endif 996162592Sjmg 997162592Sjmg error = kern_kevent(td, uap->fd, uap->nchanges, uap->nevents, 998162592Sjmg &k_ops, tsp); 999162592Sjmg 1000162592Sjmg#ifdef KTRACE 1001328454Sjhb if (error == 0 && KTRPOINT(td, KTR_STRUCT_ARRAY)) 1002328454Sjhb ktrstructarray("kevent", UIO_USERSPACE, eventlist, 1003328454Sjhb td->td_retval[0], sizeof(struct kevent)); 1004162592Sjmg#endif 1005162592Sjmg 1006162592Sjmg return (error); 1007142934Sps} 1008142934Sps 1009142934Sps/* 1010146950Sps * Copy 'count' items into the destination list pointed to by uap->eventlist. 1011142934Sps */ 1012142934Spsstatic int 1013146950Spskevent_copyout(void *arg, struct kevent *kevp, int count) 1014142934Sps{ 1015146950Sps struct kevent_args *uap; 1016142934Sps int error; 1017142934Sps 1018146950Sps KASSERT(count <= KQ_NEVENTS, ("count (%d) > KQ_NEVENTS", count)); 1019146950Sps uap = (struct kevent_args *)arg; 1020146950Sps 1021146950Sps error = copyout(kevp, uap->eventlist, count * sizeof *kevp); 1022146950Sps if (error == 0) 1023146950Sps uap->eventlist += count; 1024142934Sps return (error); 1025142934Sps} 1026142934Sps 1027146950Sps/* 1028146950Sps * Copy 'count' items from the list pointed to by uap->changelist. 1029146950Sps */ 1030146950Spsstatic int 1031146950Spskevent_copyin(void *arg, struct kevent *kevp, int count) 1032146950Sps{ 1033146950Sps struct kevent_args *uap; 1034146950Sps int error; 1035146950Sps 1036146950Sps KASSERT(count <= KQ_NEVENTS, ("count (%d) > KQ_NEVENTS", count)); 1037146950Sps uap = (struct kevent_args *)arg; 1038146950Sps 1039146950Sps error = copyin(uap->changelist, kevp, count * sizeof *kevp); 1040146950Sps if (error == 0) 1041146950Sps uap->changelist += count; 1042146950Sps return (error); 1043146950Sps} 1044146950Sps 1045142934Spsint 1046146950Spskern_kevent(struct thread *td, int fd, int nchanges, int nevents, 1047146950Sps struct kevent_copyops *k_ops, const struct timespec *timeout) 1048142934Sps{ 1049283440Sdchagin cap_rights_t rights; 1050255675Srdivacky struct file *fp; 1051283440Sdchagin int error; 105259290Sjlemon 1053258181Spjd cap_rights_init(&rights); 1054258181Spjd if (nchanges > 0) 1055258181Spjd cap_rights_set(&rights, CAP_KQUEUE_CHANGE); 1056258181Spjd if (nevents > 0) 1057258181Spjd cap_rights_set(&rights, CAP_KQUEUE_EVENT); 1058258181Spjd error = fget(td, fd, &rights, &fp); 1059255675Srdivacky if (error != 0) 1060255675Srdivacky return (error); 1061258181Spjd 1062283440Sdchagin error = kern_kevent_fp(td, fp, nchanges, nevents, k_ops, timeout); 1063283440Sdchagin fdrop(fp, td); 1064283440Sdchagin 1065283440Sdchagin return (error); 1066283440Sdchagin} 1067283440Sdchagin 1068286631Sedstatic int 1069286631Sedkqueue_kevent(struct kqueue *kq, struct thread *td, int nchanges, int nevents, 1070283440Sdchagin struct kevent_copyops *k_ops, const struct timespec *timeout) 1071283440Sdchagin{ 1072283440Sdchagin struct kevent keva[KQ_NEVENTS]; 1073283440Sdchagin struct kevent *kevp, *changes; 1074283440Sdchagin int i, n, nerrors, error; 1075283440Sdchagin 107659290Sjlemon nerrors = 0; 1077142934Sps while (nchanges > 0) { 1078146950Sps n = nchanges > KQ_NEVENTS ? KQ_NEVENTS : nchanges; 1079146950Sps error = k_ops->k_copyin(k_ops->arg, keva, n); 1080146950Sps if (error) 1081286631Sed return (error); 1082146950Sps changes = keva; 108359290Sjlemon for (i = 0; i < n; i++) { 1084142934Sps kevp = &changes[i]; 1085151260Sambrisko if (!kevp->filter) 1086151260Sambrisko continue; 108763452Sjlemon kevp->flags &= ~EV_SYSFLAGS; 1088133741Sjmg error = kqueue_register(kq, kevp, td, 1); 1089197243Ssson if (error || (kevp->flags & EV_RECEIPT)) { 1090286631Sed if (nevents == 0) 1091286631Sed return (error); 1092286631Sed kevp->flags = EV_ERROR; 1093286631Sed kevp->data = error; 1094286631Sed (void)k_ops->k_copyout(k_ops->arg, kevp, 1); 1095286631Sed nevents--; 1096286631Sed nerrors++; 109759290Sjlemon } 109859290Sjlemon } 1099142934Sps nchanges -= n; 110059290Sjlemon } 110159290Sjlemon if (nerrors) { 1102133741Sjmg td->td_retval[0] = nerrors; 1103286631Sed return (0); 110459290Sjlemon } 110559290Sjlemon 1106286631Sed return (kqueue_scan(kq, nevents, k_ops, timeout, keva, td)); 1107286631Sed} 1108286631Sed 1109286631Sedint 1110286631Sedkern_kevent_fp(struct thread *td, struct file *fp, int nchanges, int nevents, 1111286631Sed struct kevent_copyops *k_ops, const struct timespec *timeout) 1112286631Sed{ 1113286631Sed struct kqueue *kq; 1114286631Sed int error; 1115286631Sed 1116286631Sed error = kqueue_acquire(fp, &kq); 1117286631Sed if (error != 0) 1118286631Sed return (error); 1119286631Sed error = kqueue_kevent(kq, td, nchanges, nevents, k_ops, timeout); 1120133741Sjmg kqueue_release(kq, 0); 112159290Sjlemon return (error); 112259290Sjlemon} 112359290Sjlemon 1124286681Sed/* 1125286681Sed * Performs a kevent() call on a temporarily created kqueue. This can be 1126286681Sed * used to perform one-shot polling, similar to poll() and select(). 1127286681Sed */ 112859290Sjlemonint 1129286631Sedkern_kevent_anonymous(struct thread *td, int nevents, 1130286631Sed struct kevent_copyops *k_ops) 1131286631Sed{ 1132286631Sed struct kqueue kq = {}; 1133286631Sed int error; 1134286631Sed 1135286631Sed kqueue_init(&kq); 1136286631Sed kq.kq_refcnt = 1; 1137286631Sed error = kqueue_kevent(&kq, td, nevents, nevents, k_ops, NULL); 1138286631Sed kqueue_drain(&kq, td); 1139286631Sed kqueue_destroy(&kq); 1140286631Sed return (error); 1141286631Sed} 1142286631Sed 1143286631Sedint 114488633Salfredkqueue_add_filteropts(int filt, struct filterops *filtops) 114588633Salfred{ 1146133741Sjmg int error; 114788633Salfred 1148201352Sbrooks error = 0; 1149133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) { 1150133741Sjmg printf( 1151133741Sjmg"trying to add a filterop that is out of range: %d is beyond %d\n", 1152133741Sjmg ~filt, EVFILT_SYSCOUNT); 1153133741Sjmg return EINVAL; 1154133741Sjmg } 1155133741Sjmg mtx_lock(&filterops_lock); 1156133741Sjmg if (sysfilt_ops[~filt].for_fop != &null_filtops && 1157133741Sjmg sysfilt_ops[~filt].for_fop != NULL) 1158133741Sjmg error = EEXIST; 1159133741Sjmg else { 1160133741Sjmg sysfilt_ops[~filt].for_fop = filtops; 1161133741Sjmg sysfilt_ops[~filt].for_refcnt = 0; 1162133741Sjmg } 1163133741Sjmg mtx_unlock(&filterops_lock); 1164133741Sjmg 1165201352Sbrooks return (error); 116688633Salfred} 116788633Salfred 116888633Salfredint 116988633Salfredkqueue_del_filteropts(int filt) 117088633Salfred{ 1171133741Sjmg int error; 117288633Salfred 1173133741Sjmg error = 0; 1174133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1175133741Sjmg return EINVAL; 1176133741Sjmg 1177133741Sjmg mtx_lock(&filterops_lock); 1178133741Sjmg if (sysfilt_ops[~filt].for_fop == &null_filtops || 1179133741Sjmg sysfilt_ops[~filt].for_fop == NULL) 1180133741Sjmg error = EINVAL; 1181133741Sjmg else if (sysfilt_ops[~filt].for_refcnt != 0) 1182133741Sjmg error = EBUSY; 1183133741Sjmg else { 1184133741Sjmg sysfilt_ops[~filt].for_fop = &null_filtops; 1185133741Sjmg sysfilt_ops[~filt].for_refcnt = 0; 1186133741Sjmg } 1187133741Sjmg mtx_unlock(&filterops_lock); 1188133741Sjmg 1189133741Sjmg return error; 119088633Salfred} 119188633Salfred 1192133741Sjmgstatic struct filterops * 1193133741Sjmgkqueue_fo_find(int filt) 1194133741Sjmg{ 1195133741Sjmg 1196133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1197133741Sjmg return NULL; 1198133741Sjmg 1199274560Sjmg if (sysfilt_ops[~filt].for_nolock) 1200274560Sjmg return sysfilt_ops[~filt].for_fop; 1201274560Sjmg 1202133741Sjmg mtx_lock(&filterops_lock); 1203133741Sjmg sysfilt_ops[~filt].for_refcnt++; 1204133741Sjmg if (sysfilt_ops[~filt].for_fop == NULL) 1205133741Sjmg sysfilt_ops[~filt].for_fop = &null_filtops; 1206133741Sjmg mtx_unlock(&filterops_lock); 1207133741Sjmg 1208133741Sjmg return sysfilt_ops[~filt].for_fop; 1209133741Sjmg} 1210133741Sjmg 1211133741Sjmgstatic void 1212133741Sjmgkqueue_fo_release(int filt) 1213133741Sjmg{ 1214133741Sjmg 1215133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1216133741Sjmg return; 1217133741Sjmg 1218274560Sjmg if (sysfilt_ops[~filt].for_nolock) 1219274560Sjmg return; 1220274560Sjmg 1221133741Sjmg mtx_lock(&filterops_lock); 1222133741Sjmg KASSERT(sysfilt_ops[~filt].for_refcnt > 0, 1223133741Sjmg ("filter object refcount not valid on release")); 1224133741Sjmg sysfilt_ops[~filt].for_refcnt--; 1225133741Sjmg mtx_unlock(&filterops_lock); 1226133741Sjmg} 1227133741Sjmg 1228133741Sjmg/* 1229170029Srwatson * A ref to kq (obtained via kqueue_acquire) must be held. waitok will 1230133741Sjmg * influence if memory allocation should wait. Make sure it is 0 if you 1231133741Sjmg * hold any mutexes. 1232133741Sjmg */ 1233162594Sjmgstatic int 1234133741Sjmgkqueue_register(struct kqueue *kq, struct kevent *kev, struct thread *td, int waitok) 123559290Sjlemon{ 123659290Sjlemon struct filterops *fops; 1237133741Sjmg struct file *fp; 1238133741Sjmg struct knote *kn, *tkn; 1239302235Skib struct knlist *knl; 1240255219Spjd cap_rights_t rights; 1241133741Sjmg int error, filt, event; 1242255798Skib int haskqglobal, filedesc_unlock; 124359290Sjlemon 1244295785Smarkj if ((kev->flags & (EV_ENABLE | EV_DISABLE)) == (EV_ENABLE | EV_DISABLE)) 1245295785Smarkj return (EINVAL); 1246295785Smarkj 1247133741Sjmg fp = NULL; 1248133741Sjmg kn = NULL; 1249302235Skib knl = NULL; 1250133741Sjmg error = 0; 1251133741Sjmg haskqglobal = 0; 1252255798Skib filedesc_unlock = 0; 125359290Sjlemon 1254133741Sjmg filt = kev->filter; 1255133741Sjmg fops = kqueue_fo_find(filt); 1256133741Sjmg if (fops == NULL) 1257133741Sjmg return EINVAL; 1258133741Sjmg 1259287362Skib if (kev->flags & EV_ADD) { 1260287362Skib /* 1261287362Skib * Prevent waiting with locks. Non-sleepable 1262287362Skib * allocation failures are handled in the loop, only 1263287362Skib * if the spare knote appears to be actually required. 1264287362Skib */ 1265287362Skib tkn = knote_alloc(waitok); 1266287362Skib } else { 1267274560Sjmg tkn = NULL; 1268287362Skib } 1269133741Sjmg 1270133741Sjmgfindkn: 127159290Sjlemon if (fops->f_isfd) { 1272133741Sjmg KASSERT(td != NULL, ("td is NULL")); 1273303216Skib if (kev->ident > INT_MAX) 1274303216Skib error = EBADF; 1275303216Skib else 1276303216Skib error = fget(td, kev->ident, 1277303216Skib cap_rights_init(&rights, CAP_EVENT), &fp); 1278159553Sjhb if (error) 1279133741Sjmg goto done; 128059290Sjlemon 1281133741Sjmg if ((kev->flags & EV_ADD) == EV_ADD && kqueue_expand(kq, fops, 1282133741Sjmg kev->ident, 0) != 0) { 1283159553Sjhb /* try again */ 1284133741Sjmg fdrop(fp, td); 1285133741Sjmg fp = NULL; 1286133741Sjmg error = kqueue_expand(kq, fops, kev->ident, waitok); 1287133741Sjmg if (error) 1288133741Sjmg goto done; 1289133741Sjmg goto findkn; 1290133741Sjmg } 1291133741Sjmg 1292133741Sjmg if (fp->f_type == DTYPE_KQUEUE) { 1293133741Sjmg /* 1294295012Svangyzen * If we add some intelligence about what we are doing, 1295133741Sjmg * we should be able to support events on ourselves. 1296133741Sjmg * We need to know when we are doing this to prevent 1297133741Sjmg * getting both the knlist lock and the kq lock since 1298133741Sjmg * they are the same thing. 1299133741Sjmg */ 1300133741Sjmg if (fp->f_data == kq) { 1301133741Sjmg error = EINVAL; 1302159172Spjd goto done; 1303133741Sjmg } 1304133741Sjmg 1305255798Skib /* 1306255798Skib * Pre-lock the filedesc before the global 1307255798Skib * lock mutex, see the comment in 1308255798Skib * kqueue_close(). 1309255798Skib */ 1310255798Skib FILEDESC_XLOCK(td->td_proc->p_fd); 1311255798Skib filedesc_unlock = 1; 1312133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1313133741Sjmg } 1314133741Sjmg 1315133741Sjmg KQ_LOCK(kq); 1316133741Sjmg if (kev->ident < kq->kq_knlistsize) { 1317133741Sjmg SLIST_FOREACH(kn, &kq->kq_knlist[kev->ident], kn_link) 1318133741Sjmg if (kev->filter == kn->kn_filter) 131959290Sjlemon break; 132059290Sjlemon } 132159290Sjlemon } else { 1322341083Smarkj if ((kev->flags & EV_ADD) == EV_ADD) { 1323341083Smarkj error = kqueue_expand(kq, fops, kev->ident, waitok); 1324341083Smarkj if (error != 0) 1325341083Smarkj goto done; 1326341083Smarkj } 1327133741Sjmg 1328133741Sjmg KQ_LOCK(kq); 1329295012Svangyzen 1330295012Svangyzen /* 1331295012Svangyzen * If possible, find an existing knote to use for this kevent. 1332295012Svangyzen */ 1333295012Svangyzen if (kev->filter == EVFILT_PROC && 1334295012Svangyzen (kev->flags & (EV_FLAG1 | EV_FLAG2)) != 0) { 1335295012Svangyzen /* This is an internal creation of a process tracking 1336295012Svangyzen * note. Don't attempt to coalesce this with an 1337295012Svangyzen * existing note. 1338295012Svangyzen */ 1339295012Svangyzen ; 1340295012Svangyzen } else if (kq->kq_knhashmask != 0) { 134159290Sjlemon struct klist *list; 1342133635Sjmg 1343133741Sjmg list = &kq->kq_knhash[ 1344133741Sjmg KN_HASH((u_long)kev->ident, kq->kq_knhashmask)]; 134559290Sjlemon SLIST_FOREACH(kn, list, kn_link) 134659290Sjlemon if (kev->ident == kn->kn_id && 134759290Sjlemon kev->filter == kn->kn_filter) 134859290Sjlemon break; 134959290Sjlemon } 135059290Sjlemon } 135159290Sjlemon 1352295012Svangyzen /* knote is in the process of changing, wait for it to stabilize. */ 1353133741Sjmg if (kn != NULL && (kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1354197930Skib KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1355255798Skib if (filedesc_unlock) { 1356255798Skib FILEDESC_XUNLOCK(td->td_proc->p_fd); 1357255798Skib filedesc_unlock = 0; 1358255798Skib } 1359197930Skib kq->kq_state |= KQ_FLUXWAIT; 1360197930Skib msleep(kq, &kq->kq_lock, PSOCK | PDROP, "kqflxwt", 0); 1361133741Sjmg if (fp != NULL) { 1362133741Sjmg fdrop(fp, td); 1363133741Sjmg fp = NULL; 1364133741Sjmg } 1365133741Sjmg goto findkn; 1366133741Sjmg } 1367133741Sjmg 136859290Sjlemon /* 136959290Sjlemon * kn now contains the matching knote, or NULL if no match 137059290Sjlemon */ 1371197240Ssson if (kn == NULL) { 1372197240Ssson if (kev->flags & EV_ADD) { 1373133741Sjmg kn = tkn; 1374133741Sjmg tkn = NULL; 137568883Sdillon if (kn == NULL) { 1376159173Spjd KQ_UNLOCK(kq); 137768883Sdillon error = ENOMEM; 137868883Sdillon goto done; 137968883Sdillon } 138059290Sjlemon kn->kn_fp = fp; 138159290Sjlemon kn->kn_kq = kq; 138259290Sjlemon kn->kn_fop = fops; 138368883Sdillon /* 1384133741Sjmg * apply reference counts to knote structure, and 138568883Sdillon * do not release it at the end of this routine. 138668883Sdillon */ 1387133741Sjmg fops = NULL; 138868883Sdillon fp = NULL; 138968883Sdillon 139061962Sjlemon kn->kn_sfflags = kev->fflags; 139161962Sjlemon kn->kn_sdata = kev->data; 139261962Sjlemon kev->fflags = 0; 139361962Sjlemon kev->data = 0; 139461962Sjlemon kn->kn_kevent = *kev; 1395157383Sjmg kn->kn_kevent.flags &= ~(EV_ADD | EV_DELETE | 1396274560Sjmg EV_ENABLE | EV_DISABLE | EV_FORCEONESHOT); 1397133741Sjmg kn->kn_status = KN_INFLUX|KN_DETACHED; 1398340904Smarkj if ((kev->flags & EV_DISABLE) != 0) 1399340904Smarkj kn->kn_status |= KN_DISABLED; 140061962Sjlemon 1401133741Sjmg error = knote_attach(kn, kq); 1402133741Sjmg KQ_UNLOCK(kq); 1403133741Sjmg if (error != 0) { 1404133741Sjmg tkn = kn; 1405133741Sjmg goto done; 1406133741Sjmg } 1407133741Sjmg 1408133741Sjmg if ((error = kn->kn_fop->f_attach(kn)) != 0) { 140983366Sjulian knote_drop(kn, td); 141059290Sjlemon goto done; 141159290Sjlemon } 1412302235Skib knl = kn_list_lock(kn); 1413197240Ssson goto done_ev_add; 141461962Sjlemon } else { 1415197240Ssson /* No matching knote and the EV_ADD flag is not set. */ 1416133741Sjmg KQ_UNLOCK(kq); 1417197240Ssson error = ENOENT; 1418197240Ssson goto done; 141959290Sjlemon } 1420197240Ssson } 1421197240Ssson 1422197240Ssson if (kev->flags & EV_DELETE) { 1423133741Sjmg kn->kn_status |= KN_INFLUX; 1424133741Sjmg KQ_UNLOCK(kq); 1425134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1426134859Sjmg kn->kn_fop->f_detach(kn); 142783366Sjulian knote_drop(kn, td); 142859290Sjlemon goto done; 142959290Sjlemon } 143059290Sjlemon 1431274560Sjmg if (kev->flags & EV_FORCEONESHOT) { 1432274560Sjmg kn->kn_flags |= EV_ONESHOT; 1433274560Sjmg KNOTE_ACTIVATE(kn, 1); 1434274560Sjmg } 1435274560Sjmg 1436340904Smarkj if ((kev->flags & EV_ENABLE) != 0) 1437340904Smarkj kn->kn_status &= ~KN_DISABLED; 1438340904Smarkj else if ((kev->flags & EV_DISABLE) != 0) 1439340904Smarkj kn->kn_status |= KN_DISABLED; 1440340904Smarkj 1441197240Ssson /* 1442197240Ssson * The user may change some filter values after the initial EV_ADD, 1443197240Ssson * but doing so will not reset any filter which has already been 1444197240Ssson * triggered. 1445197240Ssson */ 1446264146Skib kn->kn_status |= KN_INFLUX | KN_SCAN; 1447197240Ssson KQ_UNLOCK(kq); 1448302235Skib knl = kn_list_lock(kn); 1449197240Ssson kn->kn_kevent.udata = kev->udata; 1450197240Ssson if (!fops->f_isfd && fops->f_touch != NULL) { 1451197240Ssson fops->f_touch(kn, kev, EVENT_REGISTER); 1452197240Ssson } else { 1453197240Ssson kn->kn_sfflags = kev->fflags; 1454197240Ssson kn->kn_sdata = kev->data; 1455197240Ssson } 1456197240Ssson 1457340904Smarkjdone_ev_add: 1458197240Ssson /* 1459197240Ssson * We can get here with kn->kn_knlist == NULL. This can happen when 1460197240Ssson * the initial attach event decides that the event is "completed" 1461340904Smarkj * already, e.g., filt_procattach() is called on a zombie process. It 1462340904Smarkj * will call filt_proc() which will remove it from the list, and NULL 1463197240Ssson * kn_knlist. 1464340904Smarkj * 1465340904Smarkj * KN_DISABLED will be stable while the knote is in flux, so the 1466340904Smarkj * unlocked read will not race with an update. 1467197240Ssson */ 1468274560Sjmg if ((kn->kn_status & KN_DISABLED) == 0) 1469274560Sjmg event = kn->kn_fop->f_event(kn, 0); 1470274560Sjmg else 1471274560Sjmg event = 0; 1472295786Smarkj 1473197240Ssson KQ_LOCK(kq); 1474197240Ssson if (event) 1475295786Smarkj kn->kn_status |= KN_ACTIVE; 1476295786Smarkj if ((kn->kn_status & (KN_ACTIVE | KN_DISABLED | KN_QUEUED)) == 1477295786Smarkj KN_ACTIVE) 1478295786Smarkj knote_enqueue(kn); 1479264146Skib kn->kn_status &= ~(KN_INFLUX | KN_SCAN); 1480302235Skib kn_list_unlock(knl); 1481133741Sjmg KQ_UNLOCK_FLUX(kq); 148259290Sjlemon 148359290Sjlemondone: 1484133741Sjmg KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1485255798Skib if (filedesc_unlock) 1486255798Skib FILEDESC_XUNLOCK(td->td_proc->p_fd); 148768883Sdillon if (fp != NULL) 148883366Sjulian fdrop(fp, td); 1489287362Skib knote_free(tkn); 1490133741Sjmg if (fops != NULL) 1491133741Sjmg kqueue_fo_release(filt); 149259290Sjlemon return (error); 149359290Sjlemon} 149459290Sjlemon 149559290Sjlemonstatic int 1496170029Srwatsonkqueue_acquire(struct file *fp, struct kqueue **kqp) 149759290Sjlemon{ 1498133741Sjmg int error; 149989306Salfred struct kqueue *kq; 1500133741Sjmg 1501133741Sjmg error = 0; 1502133741Sjmg 1503174988Sjeff kq = fp->f_data; 1504174988Sjeff if (fp->f_type != DTYPE_KQUEUE || kq == NULL) 1505174988Sjeff return (EBADF); 1506174988Sjeff *kqp = kq; 1507174988Sjeff KQ_LOCK(kq); 1508174988Sjeff if ((kq->kq_state & KQ_CLOSING) == KQ_CLOSING) { 1509133741Sjmg KQ_UNLOCK(kq); 1510174988Sjeff return (EBADF); 1511174988Sjeff } 1512174988Sjeff kq->kq_refcnt++; 1513174988Sjeff KQ_UNLOCK(kq); 1514133741Sjmg 1515133741Sjmg return error; 1516133741Sjmg} 1517133741Sjmg 1518133741Sjmgstatic void 1519133741Sjmgkqueue_release(struct kqueue *kq, int locked) 1520133741Sjmg{ 1521133741Sjmg if (locked) 1522133741Sjmg KQ_OWNED(kq); 1523133741Sjmg else 1524133741Sjmg KQ_LOCK(kq); 1525133741Sjmg kq->kq_refcnt--; 1526133741Sjmg if (kq->kq_refcnt == 1) 1527133741Sjmg wakeup(&kq->kq_refcnt); 1528133741Sjmg if (!locked) 1529133741Sjmg KQ_UNLOCK(kq); 1530133741Sjmg} 1531133741Sjmg 1532133741Sjmgstatic void 1533133741Sjmgkqueue_schedtask(struct kqueue *kq) 1534133741Sjmg{ 1535133741Sjmg 1536133741Sjmg KQ_OWNED(kq); 1537133741Sjmg KASSERT(((kq->kq_state & KQ_TASKDRAIN) != KQ_TASKDRAIN), 1538133741Sjmg ("scheduling kqueue task while draining")); 1539133741Sjmg 1540133741Sjmg if ((kq->kq_state & KQ_TASKSCHED) != KQ_TASKSCHED) { 1541300627Skib taskqueue_enqueue(taskqueue_kqueue_ctx, &kq->kq_task); 1542133741Sjmg kq->kq_state |= KQ_TASKSCHED; 1543133741Sjmg } 1544133741Sjmg} 1545133741Sjmg 1546133741Sjmg/* 1547133741Sjmg * Expand the kq to make sure we have storage for fops/ident pair. 1548133741Sjmg * 1549133741Sjmg * Return 0 on success (or no work necessary), return errno on failure. 1550133741Sjmg * 1551133741Sjmg * Not calling hashinit w/ waitok (proper malloc flag) should be safe. 1552133741Sjmg * If kqueue_register is called from a non-fd context, there usually/should 1553133741Sjmg * be no locks held. 1554133741Sjmg */ 1555133741Sjmgstatic int 1556133741Sjmgkqueue_expand(struct kqueue *kq, struct filterops *fops, uintptr_t ident, 1557133741Sjmg int waitok) 1558133741Sjmg{ 1559205886Sjhb struct klist *list, *tmp_knhash, *to_free; 1560133741Sjmg u_long tmp_knhashmask; 1561341083Smarkj int error, fd, size; 1562133741Sjmg int mflag = waitok ? M_WAITOK : M_NOWAIT; 1563133741Sjmg 1564133741Sjmg KQ_NOTOWNED(kq); 1565133741Sjmg 1566341083Smarkj error = 0; 1567205886Sjhb to_free = NULL; 1568133741Sjmg if (fops->f_isfd) { 1569133741Sjmg fd = ident; 1570133741Sjmg if (kq->kq_knlistsize <= fd) { 1571133741Sjmg size = kq->kq_knlistsize; 1572133741Sjmg while (size <= fd) 1573133741Sjmg size += KQEXTENT; 1574197575Sdelphij list = malloc(size * sizeof(*list), M_KQUEUE, mflag); 1575133741Sjmg if (list == NULL) 1576133741Sjmg return ENOMEM; 1577133741Sjmg KQ_LOCK(kq); 1578341083Smarkj if ((kq->kq_state & KQ_CLOSING) != 0) { 1579205886Sjhb to_free = list; 1580341083Smarkj error = EBADF; 1581341083Smarkj } else if (kq->kq_knlistsize > fd) { 1582341083Smarkj to_free = list; 1583133741Sjmg } else { 1584133741Sjmg if (kq->kq_knlist != NULL) { 1585133741Sjmg bcopy(kq->kq_knlist, list, 1586197575Sdelphij kq->kq_knlistsize * sizeof(*list)); 1587205886Sjhb to_free = kq->kq_knlist; 1588133741Sjmg kq->kq_knlist = NULL; 1589133741Sjmg } 1590133741Sjmg bzero((caddr_t)list + 1591197575Sdelphij kq->kq_knlistsize * sizeof(*list), 1592197575Sdelphij (size - kq->kq_knlistsize) * sizeof(*list)); 1593133741Sjmg kq->kq_knlistsize = size; 1594133741Sjmg kq->kq_knlist = list; 1595133741Sjmg } 1596133741Sjmg KQ_UNLOCK(kq); 1597133741Sjmg } 1598133741Sjmg } else { 1599133741Sjmg if (kq->kq_knhashmask == 0) { 1600133741Sjmg tmp_knhash = hashinit(KN_HASHSIZE, M_KQUEUE, 1601133741Sjmg &tmp_knhashmask); 1602133741Sjmg if (tmp_knhash == NULL) 1603341083Smarkj return (ENOMEM); 1604133741Sjmg KQ_LOCK(kq); 1605341083Smarkj if ((kq->kq_state & KQ_CLOSING) != 0) { 1606341083Smarkj to_free = tmp_knhash; 1607341083Smarkj error = EBADF; 1608341083Smarkj } else if (kq->kq_knhashmask == 0) { 1609133741Sjmg kq->kq_knhash = tmp_knhash; 1610133741Sjmg kq->kq_knhashmask = tmp_knhashmask; 1611133741Sjmg } else { 1612205886Sjhb to_free = tmp_knhash; 1613133741Sjmg } 1614133741Sjmg KQ_UNLOCK(kq); 1615133741Sjmg } 1616133741Sjmg } 1617205886Sjhb free(to_free, M_KQUEUE); 1618133741Sjmg 1619133741Sjmg KQ_NOTOWNED(kq); 1620341083Smarkj return (error); 1621133741Sjmg} 1622133741Sjmg 1623133741Sjmgstatic void 1624133741Sjmgkqueue_task(void *arg, int pending) 1625133741Sjmg{ 1626133741Sjmg struct kqueue *kq; 1627133741Sjmg int haskqglobal; 1628133741Sjmg 1629133741Sjmg haskqglobal = 0; 1630133741Sjmg kq = arg; 1631133741Sjmg 1632133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1633133741Sjmg KQ_LOCK(kq); 1634133741Sjmg 1635133741Sjmg KNOTE_LOCKED(&kq->kq_sel.si_note, 0); 1636133741Sjmg 1637133741Sjmg kq->kq_state &= ~KQ_TASKSCHED; 1638133741Sjmg if ((kq->kq_state & KQ_TASKDRAIN) == KQ_TASKDRAIN) { 1639133741Sjmg wakeup(&kq->kq_state); 1640133741Sjmg } 1641133741Sjmg KQ_UNLOCK(kq); 1642133741Sjmg KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1643133741Sjmg} 1644133741Sjmg 1645133741Sjmg/* 1646133741Sjmg * Scan, update kn_data (if not ONESHOT), and copyout triggered events. 1647133741Sjmg * We treat KN_MARKER knotes as if they are INFLUX. 1648133741Sjmg */ 1649133741Sjmgstatic int 1650146950Spskqueue_scan(struct kqueue *kq, int maxevents, struct kevent_copyops *k_ops, 1651146950Sps const struct timespec *tsp, struct kevent *keva, struct thread *td) 1652133741Sjmg{ 165359290Sjlemon struct kevent *kevp; 1654133794Sgreen struct knote *kn, *marker; 1655302235Skib struct knlist *knl; 1656247804Sdavide sbintime_t asbt, rsbt; 1657247804Sdavide int count, error, haskqglobal, influx, nkev, touch; 165859290Sjlemon 165959290Sjlemon count = maxevents; 1660133741Sjmg nkev = 0; 1661133741Sjmg error = 0; 1662133741Sjmg haskqglobal = 0; 166359290Sjlemon 1664133741Sjmg if (maxevents == 0) 1665133741Sjmg goto done_nl; 1666133741Sjmg 1667247804Sdavide rsbt = 0; 166864343Sjlemon if (tsp != NULL) { 1669247804Sdavide if (tsp->tv_sec < 0 || tsp->tv_nsec < 0 || 1670247917Smav tsp->tv_nsec >= 1000000000) { 167159290Sjlemon error = EINVAL; 1672133741Sjmg goto done_nl; 167359290Sjlemon } 1674247804Sdavide if (timespecisset(tsp)) { 1675248092Smav if (tsp->tv_sec <= INT32_MAX) { 1676247898Smav rsbt = tstosbt(*tsp); 1677247898Smav if (TIMESEL(&asbt, rsbt)) 1678247898Smav asbt += tc_tick_sbt; 1679264388Sdavide if (asbt <= SBT_MAX - rsbt) 1680248092Smav asbt += rsbt; 1681248092Smav else 1682247898Smav asbt = 0; 1683247898Smav rsbt >>= tc_precexp; 1684247898Smav } else 1685247898Smav asbt = 0; 1686247804Sdavide } else 1687247804Sdavide asbt = -1; 1688247804Sdavide } else 1689247804Sdavide asbt = 0; 1690133794Sgreen marker = knote_alloc(1); 1691133794Sgreen marker->kn_status = KN_MARKER; 1692133741Sjmg KQ_LOCK(kq); 169359290Sjlemon 169459290Sjlemonretry: 1695133741Sjmg kevp = keva; 169659290Sjlemon if (kq->kq_count == 0) { 1697247804Sdavide if (asbt == -1) { 169864343Sjlemon error = EWOULDBLOCK; 169964343Sjlemon } else { 170064343Sjlemon kq->kq_state |= KQ_SLEEP; 1701247804Sdavide error = msleep_sbt(kq, &kq->kq_lock, PSOCK | PCATCH, 1702247804Sdavide "kqread", asbt, rsbt, C_ABSOLUTE); 170364343Sjlemon } 170464084Sjlemon if (error == 0) 170559290Sjlemon goto retry; 170664084Sjlemon /* don't restart after signals... */ 170764084Sjlemon if (error == ERESTART) 170864084Sjlemon error = EINTR; 170964084Sjlemon else if (error == EWOULDBLOCK) 171059290Sjlemon error = 0; 171159290Sjlemon goto done; 171259290Sjlemon } 171359290Sjlemon 1714133794Sgreen TAILQ_INSERT_TAIL(&kq->kq_head, marker, kn_tqe); 1715178914Skib influx = 0; 171659290Sjlemon while (count) { 1717133741Sjmg KQ_OWNED(kq); 171859290Sjlemon kn = TAILQ_FIRST(&kq->kq_head); 1719133741Sjmg 1720133794Sgreen if ((kn->kn_status == KN_MARKER && kn != marker) || 1721133741Sjmg (kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1722178914Skib if (influx) { 1723178914Skib influx = 0; 1724178914Skib KQ_FLUX_WAKEUP(kq); 1725178914Skib } 1726180336Skib kq->kq_state |= KQ_FLUXWAIT; 1727133741Sjmg error = msleep(kq, &kq->kq_lock, PSOCK, 1728133741Sjmg "kqflxwt", 0); 1729133741Sjmg continue; 1730133741Sjmg } 1731133741Sjmg 1732133590Srwatson TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); 1733133741Sjmg if ((kn->kn_status & KN_DISABLED) == KN_DISABLED) { 1734133741Sjmg kn->kn_status &= ~KN_QUEUED; 1735133741Sjmg kq->kq_count--; 1736133741Sjmg continue; 1737133741Sjmg } 1738133794Sgreen if (kn == marker) { 1739133741Sjmg KQ_FLUX_WAKEUP(kq); 174059290Sjlemon if (count == maxevents) 174159290Sjlemon goto retry; 174259290Sjlemon goto done; 174359290Sjlemon } 1744133741Sjmg KASSERT((kn->kn_status & KN_INFLUX) == 0, 1745133741Sjmg ("KN_INFLUX set when not suppose to be")); 1746133741Sjmg 1747254072Sjhb if ((kn->kn_flags & EV_DROP) == EV_DROP) { 174859290Sjlemon kn->kn_status &= ~KN_QUEUED; 1749133741Sjmg kn->kn_status |= KN_INFLUX; 175059290Sjlemon kq->kq_count--; 1751133741Sjmg KQ_UNLOCK(kq); 1752133741Sjmg /* 1753133741Sjmg * We don't need to lock the list since we've marked 1754133741Sjmg * it _INFLUX. 1755133741Sjmg */ 1756254072Sjhb if (!(kn->kn_status & KN_DETACHED)) 1757254072Sjhb kn->kn_fop->f_detach(kn); 1758254072Sjhb knote_drop(kn, td); 1759254072Sjhb KQ_LOCK(kq); 1760254072Sjhb continue; 1761254072Sjhb } else if ((kn->kn_flags & EV_ONESHOT) == EV_ONESHOT) { 1762254072Sjhb kn->kn_status &= ~KN_QUEUED; 1763254072Sjhb kn->kn_status |= KN_INFLUX; 1764254072Sjhb kq->kq_count--; 1765254072Sjhb KQ_UNLOCK(kq); 1766254072Sjhb /* 1767254072Sjhb * We don't need to lock the list since we've marked 1768254072Sjhb * it _INFLUX. 1769254072Sjhb */ 1770133741Sjmg *kevp = kn->kn_kevent; 1771134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1772134859Sjmg kn->kn_fop->f_detach(kn); 177383366Sjulian knote_drop(kn, td); 1774133741Sjmg KQ_LOCK(kq); 1775133741Sjmg kn = NULL; 177659290Sjlemon } else { 1777264146Skib kn->kn_status |= KN_INFLUX | KN_SCAN; 1778133741Sjmg KQ_UNLOCK(kq); 1779133741Sjmg if ((kn->kn_status & KN_KQUEUE) == KN_KQUEUE) 1780133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1781302235Skib knl = kn_list_lock(kn); 1782133741Sjmg if (kn->kn_fop->f_event(kn, 0) == 0) { 1783133741Sjmg KQ_LOCK(kq); 1784157754Sjhb KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1785133741Sjmg kn->kn_status &= 1786264146Skib ~(KN_QUEUED | KN_ACTIVE | KN_INFLUX | 1787264146Skib KN_SCAN); 1788133741Sjmg kq->kq_count--; 1789302235Skib kn_list_unlock(knl); 1790178914Skib influx = 1; 1791133741Sjmg continue; 1792133741Sjmg } 1793197240Ssson touch = (!kn->kn_fop->f_isfd && 1794197240Ssson kn->kn_fop->f_touch != NULL); 1795197240Ssson if (touch) 1796197240Ssson kn->kn_fop->f_touch(kn, kevp, EVENT_PROCESS); 1797197240Ssson else 1798197240Ssson *kevp = kn->kn_kevent; 1799133741Sjmg KQ_LOCK(kq); 1800157754Sjhb KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1801254932Sjmg if (kn->kn_flags & (EV_CLEAR | EV_DISPATCH)) { 1802197240Ssson /* 1803197240Ssson * Manually clear knotes who weren't 1804197240Ssson * 'touch'ed. 1805197240Ssson */ 1806197242Ssson if (touch == 0 && kn->kn_flags & EV_CLEAR) { 1807197240Ssson kn->kn_data = 0; 1808197240Ssson kn->kn_fflags = 0; 1809197240Ssson } 1810197242Ssson if (kn->kn_flags & EV_DISPATCH) 1811197242Ssson kn->kn_status |= KN_DISABLED; 1812133741Sjmg kn->kn_status &= ~(KN_QUEUED | KN_ACTIVE); 1813133741Sjmg kq->kq_count--; 1814133741Sjmg } else 1815133741Sjmg TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); 1816150199Sups 1817264146Skib kn->kn_status &= ~(KN_INFLUX | KN_SCAN); 1818302235Skib kn_list_unlock(knl); 1819178914Skib influx = 1; 182059290Sjlemon } 1821133741Sjmg 1822133741Sjmg /* we are returning a copy to the user */ 1823133741Sjmg kevp++; 1824133741Sjmg nkev++; 182559290Sjlemon count--; 1826133741Sjmg 182759290Sjlemon if (nkev == KQ_NEVENTS) { 1828178914Skib influx = 0; 1829133741Sjmg KQ_UNLOCK_FLUX(kq); 1830146950Sps error = k_ops->k_copyout(k_ops->arg, keva, nkev); 183159290Sjlemon nkev = 0; 1832133741Sjmg kevp = keva; 1833133741Sjmg KQ_LOCK(kq); 183459997Sjlemon if (error) 183559997Sjlemon break; 183659290Sjlemon } 183759290Sjlemon } 1838133794Sgreen TAILQ_REMOVE(&kq->kq_head, marker, kn_tqe); 183959290Sjlemondone: 1840133741Sjmg KQ_OWNED(kq); 1841133741Sjmg KQ_UNLOCK_FLUX(kq); 1842133794Sgreen knote_free(marker); 1843133741Sjmgdone_nl: 1844133741Sjmg KQ_NOTOWNED(kq); 184559290Sjlemon if (nkev != 0) 1846146950Sps error = k_ops->k_copyout(k_ops->arg, keva, nkev); 1847133741Sjmg td->td_retval[0] = maxevents - count; 184859290Sjlemon return (error); 184959290Sjlemon} 185059290Sjlemon 185159290Sjlemon/*ARGSUSED*/ 1852255675Srdivackystatic int 1853132138Salfredkqueue_ioctl(struct file *fp, u_long cmd, void *data, 1854102003Srwatson struct ucred *active_cred, struct thread *td) 185559290Sjlemon{ 1856132174Salfred /* 1857132174Salfred * Enabling sigio causes two major problems: 1858132174Salfred * 1) infinite recursion: 1859132174Salfred * Synopsys: kevent is being used to track signals and have FIOASYNC 1860132174Salfred * set. On receipt of a signal this will cause a kqueue to recurse 1861132174Salfred * into itself over and over. Sending the sigio causes the kqueue 1862132174Salfred * to become ready, which in turn posts sigio again, forever. 1863132174Salfred * Solution: this can be solved by setting a flag in the kqueue that 1864132174Salfred * we have a SIGIO in progress. 1865132174Salfred * 2) locking problems: 1866132174Salfred * Synopsys: Kqueue is a leaf subsystem, but adding signalling puts 1867132174Salfred * us above the proc and pgrp locks. 1868132174Salfred * Solution: Post a signal using an async mechanism, being sure to 1869132174Salfred * record a generation count in the delivery so that we do not deliver 1870132174Salfred * a signal to the wrong process. 1871132174Salfred * 1872132174Salfred * Note, these two mechanisms are somewhat mutually exclusive! 1873132174Salfred */ 1874132174Salfred#if 0 1875132138Salfred struct kqueue *kq; 1876132138Salfred 1877132138Salfred kq = fp->f_data; 1878132138Salfred switch (cmd) { 1879132138Salfred case FIOASYNC: 1880132138Salfred if (*(int *)data) { 1881132138Salfred kq->kq_state |= KQ_ASYNC; 1882132138Salfred } else { 1883132138Salfred kq->kq_state &= ~KQ_ASYNC; 1884132138Salfred } 1885132138Salfred return (0); 1886132138Salfred 1887132138Salfred case FIOSETOWN: 1888132138Salfred return (fsetown(*(int *)data, &kq->kq_sigio)); 1889132138Salfred 1890132138Salfred case FIOGETOWN: 1891132138Salfred *(int *)data = fgetown(&kq->kq_sigio); 1892132138Salfred return (0); 1893132138Salfred } 1894132174Salfred#endif 1895132138Salfred 189659290Sjlemon return (ENOTTY); 189759290Sjlemon} 189859290Sjlemon 189959290Sjlemon/*ARGSUSED*/ 1900255675Srdivackystatic int 1901101983Srwatsonkqueue_poll(struct file *fp, int events, struct ucred *active_cred, 1902101987Srwatson struct thread *td) 190359290Sjlemon{ 190489306Salfred struct kqueue *kq; 190559290Sjlemon int revents = 0; 1906133741Sjmg int error; 190759290Sjlemon 1908170029Srwatson if ((error = kqueue_acquire(fp, &kq))) 1909133741Sjmg return POLLERR; 1910133741Sjmg 1911133741Sjmg KQ_LOCK(kq); 1912133741Sjmg if (events & (POLLIN | POLLRDNORM)) { 1913133741Sjmg if (kq->kq_count) { 1914133741Sjmg revents |= events & (POLLIN | POLLRDNORM); 191559290Sjlemon } else { 1916133741Sjmg selrecord(td, &kq->kq_sel); 1917174647Sjeff if (SEL_WAITING(&kq->kq_sel)) 1918174647Sjeff kq->kq_state |= KQ_SEL; 191959290Sjlemon } 192059290Sjlemon } 1921133741Sjmg kqueue_release(kq, 1); 1922133741Sjmg KQ_UNLOCK(kq); 192359290Sjlemon return (revents); 192459290Sjlemon} 192559290Sjlemon 192659290Sjlemon/*ARGSUSED*/ 1927255675Srdivackystatic int 1928101983Srwatsonkqueue_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 1929101987Srwatson struct thread *td) 193059290Sjlemon{ 193159290Sjlemon 1932146603Sjmg bzero((void *)st, sizeof *st); 1933146603Sjmg /* 1934146603Sjmg * We no longer return kq_count because the unlocked value is useless. 1935146603Sjmg * If you spent all this time getting the count, why not spend your 1936146603Sjmg * syscall better by calling kevent? 1937146603Sjmg * 1938146603Sjmg * XXX - This is needed for libc_r. 1939146603Sjmg */ 1940146603Sjmg st->st_mode = S_IFIFO; 1941146603Sjmg return (0); 194259290Sjlemon} 194359290Sjlemon 1944286631Sedstatic void 1945286631Sedkqueue_drain(struct kqueue *kq, struct thread *td) 194659290Sjlemon{ 1947133741Sjmg struct knote *kn; 194859290Sjlemon int i; 194959290Sjlemon 1950133741Sjmg KQ_LOCK(kq); 1951133741Sjmg 1952133741Sjmg KASSERT((kq->kq_state & KQ_CLOSING) != KQ_CLOSING, 1953133741Sjmg ("kqueue already closing")); 1954133741Sjmg kq->kq_state |= KQ_CLOSING; 1955133741Sjmg if (kq->kq_refcnt > 1) 1956133741Sjmg msleep(&kq->kq_refcnt, &kq->kq_lock, PSOCK, "kqclose", 0); 1957133741Sjmg 1958133741Sjmg KASSERT(kq->kq_refcnt == 1, ("other refs are out there!")); 1959133741Sjmg 1960133741Sjmg KASSERT(knlist_empty(&kq->kq_sel.si_note), 1961133741Sjmg ("kqueue's knlist not empty")); 1962133741Sjmg 1963133741Sjmg for (i = 0; i < kq->kq_knlistsize; i++) { 1964133741Sjmg while ((kn = SLIST_FIRST(&kq->kq_knlist[i])) != NULL) { 1965178913Skib if ((kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1966178913Skib kq->kq_state |= KQ_FLUXWAIT; 1967178913Skib msleep(kq, &kq->kq_lock, PSOCK, "kqclo1", 0); 1968178913Skib continue; 1969178913Skib } 1970133741Sjmg kn->kn_status |= KN_INFLUX; 1971133741Sjmg KQ_UNLOCK(kq); 1972134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1973134859Sjmg kn->kn_fop->f_detach(kn); 1974133741Sjmg knote_drop(kn, td); 1975133741Sjmg KQ_LOCK(kq); 197659290Sjlemon } 197759290Sjlemon } 1978133741Sjmg if (kq->kq_knhashmask != 0) { 1979133741Sjmg for (i = 0; i <= kq->kq_knhashmask; i++) { 1980133741Sjmg while ((kn = SLIST_FIRST(&kq->kq_knhash[i])) != NULL) { 1981178913Skib if ((kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1982178913Skib kq->kq_state |= KQ_FLUXWAIT; 1983178913Skib msleep(kq, &kq->kq_lock, PSOCK, 1984178913Skib "kqclo2", 0); 1985178913Skib continue; 1986178913Skib } 1987133741Sjmg kn->kn_status |= KN_INFLUX; 1988133741Sjmg KQ_UNLOCK(kq); 1989134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1990134859Sjmg kn->kn_fop->f_detach(kn); 1991133741Sjmg knote_drop(kn, td); 1992133741Sjmg KQ_LOCK(kq); 199359290Sjlemon } 199459290Sjlemon } 199559290Sjlemon } 1996133741Sjmg 1997133741Sjmg if ((kq->kq_state & KQ_TASKSCHED) == KQ_TASKSCHED) { 1998133741Sjmg kq->kq_state |= KQ_TASKDRAIN; 1999133741Sjmg msleep(&kq->kq_state, &kq->kq_lock, PSOCK, "kqtqdr", 0); 2000133741Sjmg } 2001133741Sjmg 2002133741Sjmg if ((kq->kq_state & KQ_SEL) == KQ_SEL) { 2003126033Sgreen selwakeuppri(&kq->kq_sel, PSOCK); 2004174647Sjeff if (!SEL_WAITING(&kq->kq_sel)) 2005174647Sjeff kq->kq_state &= ~KQ_SEL; 2006126033Sgreen } 2007133741Sjmg 2008133741Sjmg KQ_UNLOCK(kq); 2009286631Sed} 2010133741Sjmg 2011286631Sedstatic void 2012286631Sedkqueue_destroy(struct kqueue *kq) 2013286631Sed{ 2014286631Sed 2015286681Sed KASSERT(kq->kq_fdp == NULL, 2016286681Sed ("kqueue still attached to a file descriptor")); 2017286631Sed seldrain(&kq->kq_sel); 2018286631Sed knlist_destroy(&kq->kq_sel.si_note); 2019286631Sed mtx_destroy(&kq->kq_lock); 2020286631Sed 2021286631Sed if (kq->kq_knhash != NULL) 2022286631Sed free(kq->kq_knhash, M_KQUEUE); 2023286631Sed if (kq->kq_knlist != NULL) 2024286631Sed free(kq->kq_knlist, M_KQUEUE); 2025286631Sed 2026286631Sed funsetown(&kq->kq_sigio); 2027286631Sed} 2028286631Sed 2029286631Sed/*ARGSUSED*/ 2030286631Sedstatic int 2031286631Sedkqueue_close(struct file *fp, struct thread *td) 2032286631Sed{ 2033286631Sed struct kqueue *kq = fp->f_data; 2034286631Sed struct filedesc *fdp; 2035286631Sed int error; 2036286631Sed int filedesc_unlock; 2037286631Sed 2038286631Sed if ((error = kqueue_acquire(fp, &kq))) 2039286631Sed return error; 2040286631Sed kqueue_drain(kq, td); 2041286631Sed 2042255798Skib /* 2043255798Skib * We could be called due to the knote_drop() doing fdrop(), 2044255798Skib * called from kqueue_register(). In this case the global 2045255798Skib * lock is owned, and filedesc sx is locked before, to not 2046255798Skib * take the sleepable lock after non-sleepable. 2047255798Skib */ 2048286631Sed fdp = kq->kq_fdp; 2049286681Sed kq->kq_fdp = NULL; 2050255798Skib if (!sx_xlocked(FILEDESC_LOCK(fdp))) { 2051255798Skib FILEDESC_XLOCK(fdp); 2052255798Skib filedesc_unlock = 1; 2053255798Skib } else 2054255798Skib filedesc_unlock = 0; 2055255527Skib TAILQ_REMOVE(&fdp->fd_kqlist, kq, kq_list); 2056255798Skib if (filedesc_unlock) 2057255798Skib FILEDESC_XUNLOCK(fdp); 2058133741Sjmg 2059286631Sed kqueue_destroy(kq); 2060256849Skib chgkqcnt(kq->kq_cred->cr_ruidinfo, -1, 0); 2061256849Skib crfree(kq->kq_cred); 206284138Sjlemon free(kq, M_KQUEUE); 2063109153Sdillon fp->f_data = NULL; 206459290Sjlemon 206559290Sjlemon return (0); 206659290Sjlemon} 206759290Sjlemon 2068271976Sjhbstatic int 2069271976Sjhbkqueue_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 2070271976Sjhb{ 2071271976Sjhb 2072271976Sjhb kif->kf_type = KF_TYPE_KQUEUE; 2073271976Sjhb return (0); 2074271976Sjhb} 2075271976Sjhb 207659290Sjlemonstatic void 207759290Sjlemonkqueue_wakeup(struct kqueue *kq) 207859290Sjlemon{ 2079133741Sjmg KQ_OWNED(kq); 208059290Sjlemon 2081133741Sjmg if ((kq->kq_state & KQ_SLEEP) == KQ_SLEEP) { 208259290Sjlemon kq->kq_state &= ~KQ_SLEEP; 208359290Sjlemon wakeup(kq); 208459290Sjlemon } 2085133741Sjmg if ((kq->kq_state & KQ_SEL) == KQ_SEL) { 2086122352Stanimura selwakeuppri(&kq->kq_sel, PSOCK); 2087174647Sjeff if (!SEL_WAITING(&kq->kq_sel)) 2088174647Sjeff kq->kq_state &= ~KQ_SEL; 208959290Sjlemon } 2090133741Sjmg if (!knlist_empty(&kq->kq_sel.si_note)) 2091133741Sjmg kqueue_schedtask(kq); 2092133741Sjmg if ((kq->kq_state & KQ_ASYNC) == KQ_ASYNC) { 2093132138Salfred pgsigio(&kq->kq_sigio, SIGIO, 0); 2094132138Salfred } 209559290Sjlemon} 209659290Sjlemon 209759290Sjlemon/* 2098133741Sjmg * Walk down a list of knotes, activating them if their event has triggered. 2099133741Sjmg * 2100133741Sjmg * There is a possibility to optimize in the case of one kq watching another. 2101133741Sjmg * Instead of scheduling a task to wake it up, you could pass enough state 2102133741Sjmg * down the chain to make up the parent kqueue. Make this code functional 2103133741Sjmg * first. 210459290Sjlemon */ 210559290Sjlemonvoid 2106195148Sstasknote(struct knlist *list, long hint, int lockflags) 210759290Sjlemon{ 2108133741Sjmg struct kqueue *kq; 2109287366Skib struct knote *kn, *tkn; 2110195148Sstas int error; 2111310578Skib bool own_influx; 211259290Sjlemon 2113133741Sjmg if (list == NULL) 2114133741Sjmg return; 2115133741Sjmg 2116195148Sstas KNL_ASSERT_LOCK(list, lockflags & KNF_LISTLOCKED); 2117147730Sssouhlal 2118195148Sstas if ((lockflags & KNF_LISTLOCKED) == 0) 2119147730Sssouhlal list->kl_lock(list->kl_lockarg); 2120147730Sssouhlal 2121133741Sjmg /* 2122287366Skib * If we unlock the list lock (and set KN_INFLUX), we can 2123287366Skib * eliminate the kqueue scheduling, but this will introduce 2124287366Skib * four lock/unlock's for each knote to test. Also, marker 2125287366Skib * would be needed to keep iteration position, since filters 2126287366Skib * or other threads could remove events. 2127133741Sjmg */ 2128287366Skib SLIST_FOREACH_SAFE(kn, &list->kl_list, kn_selnext, tkn) { 2129133741Sjmg kq = kn->kn_kq; 2130264146Skib KQ_LOCK(kq); 2131264146Skib if ((kn->kn_status & (KN_INFLUX | KN_SCAN)) == KN_INFLUX) { 2132264146Skib /* 2133264146Skib * Do not process the influx notes, except for 2134264146Skib * the influx coming from the kq unlock in the 2135264146Skib * kqueue_scan(). In the later case, we do 2136264146Skib * not interfere with the scan, since the code 2137264146Skib * fragment in kqueue_scan() locks the knlist, 2138264146Skib * and cannot proceed until we finished. 2139264146Skib */ 2140264146Skib KQ_UNLOCK(kq); 2141264146Skib } else if ((lockflags & KNF_NOKQLOCK) != 0) { 2142310578Skib own_influx = (kn->kn_status & KN_INFLUX) == 0; 2143310578Skib if (own_influx) 2144310578Skib kn->kn_status |= KN_INFLUX; 2145264146Skib KQ_UNLOCK(kq); 2146264146Skib error = kn->kn_fop->f_event(kn, hint); 2147133741Sjmg KQ_LOCK(kq); 2148310578Skib if (own_influx) 2149310578Skib kn->kn_status &= ~KN_INFLUX; 2150264146Skib if (error) 2151264146Skib KNOTE_ACTIVATE(kn, 1); 2152264146Skib KQ_UNLOCK_FLUX(kq); 2153264146Skib } else { 2154264146Skib kn->kn_status |= KN_HASKQLOCK; 2155264146Skib if (kn->kn_fop->f_event(kn, hint)) 2156264146Skib KNOTE_ACTIVATE(kn, 1); 2157264146Skib kn->kn_status &= ~KN_HASKQLOCK; 2158264146Skib KQ_UNLOCK(kq); 2159133741Sjmg } 2160133741Sjmg } 2161195148Sstas if ((lockflags & KNF_LISTLOCKED) == 0) 2162147730Sssouhlal list->kl_unlock(list->kl_lockarg); 216359290Sjlemon} 216459290Sjlemon 216559290Sjlemon/* 2166133741Sjmg * add a knote to a knlist 2167133741Sjmg */ 2168133741Sjmgvoid 2169133741Sjmgknlist_add(struct knlist *knl, struct knote *kn, int islocked) 2170133741Sjmg{ 2171147730Sssouhlal KNL_ASSERT_LOCK(knl, islocked); 2172133741Sjmg KQ_NOTOWNED(kn->kn_kq); 2173133741Sjmg KASSERT((kn->kn_status & (KN_INFLUX|KN_DETACHED)) == 2174133741Sjmg (KN_INFLUX|KN_DETACHED), ("knote not KN_INFLUX and KN_DETACHED")); 2175133741Sjmg if (!islocked) 2176147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 2177133741Sjmg SLIST_INSERT_HEAD(&knl->kl_list, kn, kn_selnext); 2178133741Sjmg if (!islocked) 2179147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2180133741Sjmg KQ_LOCK(kn->kn_kq); 2181133741Sjmg kn->kn_knlist = knl; 2182133741Sjmg kn->kn_status &= ~KN_DETACHED; 2183133741Sjmg KQ_UNLOCK(kn->kn_kq); 2184133741Sjmg} 2185133741Sjmg 2186133741Sjmgstatic void 2187302235Skibknlist_remove_kq(struct knlist *knl, struct knote *kn, int knlislocked, 2188302235Skib int kqislocked) 2189133741Sjmg{ 2190133741Sjmg KASSERT(!(!!kqislocked && !knlislocked), ("kq locked w/o knl locked")); 2191147730Sssouhlal KNL_ASSERT_LOCK(knl, knlislocked); 2192133741Sjmg mtx_assert(&kn->kn_kq->kq_lock, kqislocked ? MA_OWNED : MA_NOTOWNED); 2193133741Sjmg if (!kqislocked) 2194133741Sjmg KASSERT((kn->kn_status & (KN_INFLUX|KN_DETACHED)) == KN_INFLUX, 2195133741Sjmg ("knlist_remove called w/o knote being KN_INFLUX or already removed")); 2196133741Sjmg if (!knlislocked) 2197147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 2198133741Sjmg SLIST_REMOVE(&knl->kl_list, kn, knote, kn_selnext); 2199133741Sjmg kn->kn_knlist = NULL; 2200133741Sjmg if (!knlislocked) 2201302235Skib kn_list_unlock(knl); 2202133741Sjmg if (!kqislocked) 2203133741Sjmg KQ_LOCK(kn->kn_kq); 2204133741Sjmg kn->kn_status |= KN_DETACHED; 2205133741Sjmg if (!kqislocked) 2206133741Sjmg KQ_UNLOCK(kn->kn_kq); 2207133741Sjmg} 2208133741Sjmg 2209133741Sjmg/* 2210254932Sjmg * remove knote from the specified knlist 221159290Sjlemon */ 221259290Sjlemonvoid 2213133741Sjmgknlist_remove(struct knlist *knl, struct knote *kn, int islocked) 221459290Sjlemon{ 2215133741Sjmg 2216133741Sjmg knlist_remove_kq(knl, kn, islocked, 0); 2217133741Sjmg} 2218133741Sjmg 2219133741Sjmgint 2220133741Sjmgknlist_empty(struct knlist *knl) 2221133741Sjmg{ 2222233505Smelifaro 2223147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2224311046Skib return (SLIST_EMPTY(&knl->kl_list)); 2225133741Sjmg} 2226133741Sjmg 2227311046Skibstatic struct mtx knlist_lock; 2228133741SjmgMTX_SYSINIT(knlist_lock, &knlist_lock, "knlist lock for lockless objects", 2229311046Skib MTX_DEF); 2230147730Sssouhlalstatic void knlist_mtx_lock(void *arg); 2231147730Sssouhlalstatic void knlist_mtx_unlock(void *arg); 2232133741Sjmg 2233147730Sssouhlalstatic void 2234147730Sssouhlalknlist_mtx_lock(void *arg) 2235147730Sssouhlal{ 2236233505Smelifaro 2237147730Sssouhlal mtx_lock((struct mtx *)arg); 2238147730Sssouhlal} 2239147730Sssouhlal 2240147730Sssouhlalstatic void 2241147730Sssouhlalknlist_mtx_unlock(void *arg) 2242147730Sssouhlal{ 2243233505Smelifaro 2244147730Sssouhlal mtx_unlock((struct mtx *)arg); 2245147730Sssouhlal} 2246147730Sssouhlal 2247193951Skibstatic void 2248193951Skibknlist_mtx_assert_locked(void *arg) 2249147730Sssouhlal{ 2250233505Smelifaro 2251193951Skib mtx_assert((struct mtx *)arg, MA_OWNED); 2252147730Sssouhlal} 2253147730Sssouhlal 2254193951Skibstatic void 2255193951Skibknlist_mtx_assert_unlocked(void *arg) 2256193951Skib{ 2257233505Smelifaro 2258193951Skib mtx_assert((struct mtx *)arg, MA_NOTOWNED); 2259193951Skib} 2260193951Skib 2261233505Smelifarostatic void 2262233505Smelifaroknlist_rw_rlock(void *arg) 2263233505Smelifaro{ 2264233505Smelifaro 2265233505Smelifaro rw_rlock((struct rwlock *)arg); 2266233505Smelifaro} 2267233505Smelifaro 2268233505Smelifarostatic void 2269233505Smelifaroknlist_rw_runlock(void *arg) 2270233505Smelifaro{ 2271233505Smelifaro 2272233505Smelifaro rw_runlock((struct rwlock *)arg); 2273233505Smelifaro} 2274233505Smelifaro 2275233505Smelifarostatic void 2276233505Smelifaroknlist_rw_assert_locked(void *arg) 2277233505Smelifaro{ 2278233505Smelifaro 2279233505Smelifaro rw_assert((struct rwlock *)arg, RA_LOCKED); 2280233505Smelifaro} 2281233505Smelifaro 2282233505Smelifarostatic void 2283233505Smelifaroknlist_rw_assert_unlocked(void *arg) 2284233505Smelifaro{ 2285233505Smelifaro 2286233505Smelifaro rw_assert((struct rwlock *)arg, RA_UNLOCKED); 2287233505Smelifaro} 2288233505Smelifaro 2289133741Sjmgvoid 2290147730Sssouhlalknlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *), 2291193951Skib void (*kl_unlock)(void *), 2292193951Skib void (*kl_assert_locked)(void *), void (*kl_assert_unlocked)(void *)) 2293133741Sjmg{ 2294133741Sjmg 2295147730Sssouhlal if (lock == NULL) 2296147730Sssouhlal knl->kl_lockarg = &knlist_lock; 2297133741Sjmg else 2298147730Sssouhlal knl->kl_lockarg = lock; 2299133741Sjmg 2300147730Sssouhlal if (kl_lock == NULL) 2301147730Sssouhlal knl->kl_lock = knlist_mtx_lock; 2302147730Sssouhlal else 2303147730Sssouhlal knl->kl_lock = kl_lock; 2304157582Sjmg if (kl_unlock == NULL) 2305147730Sssouhlal knl->kl_unlock = knlist_mtx_unlock; 2306147730Sssouhlal else 2307147730Sssouhlal knl->kl_unlock = kl_unlock; 2308193951Skib if (kl_assert_locked == NULL) 2309193951Skib knl->kl_assert_locked = knlist_mtx_assert_locked; 2310147730Sssouhlal else 2311193951Skib knl->kl_assert_locked = kl_assert_locked; 2312193951Skib if (kl_assert_unlocked == NULL) 2313193951Skib knl->kl_assert_unlocked = knlist_mtx_assert_unlocked; 2314193951Skib else 2315193951Skib knl->kl_assert_unlocked = kl_assert_unlocked; 2316147730Sssouhlal 2317302242Skib knl->kl_autodestroy = 0; 2318133741Sjmg SLIST_INIT(&knl->kl_list); 2319133741Sjmg} 2320133741Sjmg 2321133741Sjmgvoid 2322193951Skibknlist_init_mtx(struct knlist *knl, struct mtx *lock) 2323193951Skib{ 2324193951Skib 2325193951Skib knlist_init(knl, lock, NULL, NULL, NULL, NULL); 2326193951Skib} 2327193951Skib 2328302235Skibstruct knlist * 2329302235Skibknlist_alloc(struct mtx *lock) 2330302235Skib{ 2331302235Skib struct knlist *knl; 2332302235Skib 2333302235Skib knl = malloc(sizeof(struct knlist), M_KQUEUE, M_WAITOK); 2334302235Skib knlist_init_mtx(knl, lock); 2335302235Skib return (knl); 2336302235Skib} 2337302235Skib 2338193951Skibvoid 2339233505Smelifaroknlist_init_rw_reader(struct knlist *knl, struct rwlock *lock) 2340233505Smelifaro{ 2341233505Smelifaro 2342233505Smelifaro knlist_init(knl, lock, knlist_rw_rlock, knlist_rw_runlock, 2343233505Smelifaro knlist_rw_assert_locked, knlist_rw_assert_unlocked); 2344233505Smelifaro} 2345233505Smelifaro 2346233505Smelifarovoid 2347133741Sjmgknlist_destroy(struct knlist *knl) 2348133741Sjmg{ 2349133741Sjmg 2350311771Skib KASSERT(KNLIST_EMPTY(knl), 2351311771Skib ("destroying knlist %p with knotes on it", knl)); 2352133741Sjmg} 2353133741Sjmg 2354302235Skibvoid 2355302235Skibknlist_detach(struct knlist *knl) 2356302235Skib{ 2357302235Skib 2358302235Skib KNL_ASSERT_LOCKED(knl); 2359302242Skib knl->kl_autodestroy = 1; 2360302235Skib if (knlist_empty(knl)) { 2361302235Skib knlist_destroy(knl); 2362302235Skib free(knl, M_KQUEUE); 2363302235Skib } 2364302235Skib} 2365302235Skib 2366133741Sjmg/* 2367133741Sjmg * Even if we are locked, we may need to drop the lock to allow any influx 2368133741Sjmg * knotes time to "settle". 2369133741Sjmg */ 2370133741Sjmgvoid 2371143776Sjmgknlist_cleardel(struct knlist *knl, struct thread *td, int islocked, int killkn) 2372133741Sjmg{ 2373159171Spjd struct knote *kn, *kn2; 2374133741Sjmg struct kqueue *kq; 237559290Sjlemon 2376302235Skib KASSERT(!knl->kl_autodestroy, ("cleardel for autodestroy %p", knl)); 2377133741Sjmg if (islocked) 2378147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2379133741Sjmg else { 2380147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); 2381170029Srwatsonagain: /* need to reacquire lock since we have dropped it */ 2382147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 238359290Sjlemon } 2384133741Sjmg 2385159171Spjd SLIST_FOREACH_SAFE(kn, &knl->kl_list, kn_selnext, kn2) { 2386133741Sjmg kq = kn->kn_kq; 2387133741Sjmg KQ_LOCK(kq); 2388143776Sjmg if ((kn->kn_status & KN_INFLUX)) { 2389133741Sjmg KQ_UNLOCK(kq); 2390133741Sjmg continue; 2391133741Sjmg } 2392133741Sjmg knlist_remove_kq(knl, kn, 1, 1); 2393143776Sjmg if (killkn) { 2394143776Sjmg kn->kn_status |= KN_INFLUX | KN_DETACHED; 2395143776Sjmg KQ_UNLOCK(kq); 2396143776Sjmg knote_drop(kn, td); 2397143776Sjmg } else { 2398143776Sjmg /* Make sure cleared knotes disappear soon */ 2399143776Sjmg kn->kn_flags |= (EV_EOF | EV_ONESHOT); 2400143776Sjmg KQ_UNLOCK(kq); 2401143776Sjmg } 2402133741Sjmg kq = NULL; 2403133741Sjmg } 2404133741Sjmg 2405133741Sjmg if (!SLIST_EMPTY(&knl->kl_list)) { 2406133741Sjmg /* there are still KN_INFLUX remaining */ 2407133741Sjmg kn = SLIST_FIRST(&knl->kl_list); 2408133741Sjmg kq = kn->kn_kq; 2409133741Sjmg KQ_LOCK(kq); 2410133741Sjmg KASSERT(kn->kn_status & KN_INFLUX, 2411133741Sjmg ("knote removed w/o list lock")); 2412147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2413133741Sjmg kq->kq_state |= KQ_FLUXWAIT; 2414133741Sjmg msleep(kq, &kq->kq_lock, PSOCK | PDROP, "kqkclr", 0); 2415133741Sjmg kq = NULL; 2416133741Sjmg goto again; 2417133741Sjmg } 2418133741Sjmg 2419133741Sjmg if (islocked) 2420147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2421133741Sjmg else { 2422147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2423147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); 2424133741Sjmg } 242559290Sjlemon} 242659290Sjlemon 242759290Sjlemon/* 2428168355Srwatson * Remove all knotes referencing a specified fd must be called with FILEDESC 2429168355Srwatson * lock. This prevents a race where a new fd comes along and occupies the 2430168355Srwatson * entry and we attach a knote to the fd. 243159290Sjlemon */ 243259290Sjlemonvoid 243383366Sjulianknote_fdclose(struct thread *td, int fd) 243459290Sjlemon{ 243583366Sjulian struct filedesc *fdp = td->td_proc->p_fd; 2436133741Sjmg struct kqueue *kq; 2437133741Sjmg struct knote *kn; 2438133741Sjmg int influx; 243959290Sjlemon 2440168355Srwatson FILEDESC_XLOCK_ASSERT(fdp); 2441133741Sjmg 2442133741Sjmg /* 2443133741Sjmg * We shouldn't have to worry about new kevents appearing on fd 2444133741Sjmg * since filedesc is locked. 2445133741Sjmg */ 2446255527Skib TAILQ_FOREACH(kq, &fdp->fd_kqlist, kq_list) { 2447133741Sjmg KQ_LOCK(kq); 2448133741Sjmg 2449133741Sjmgagain: 2450133741Sjmg influx = 0; 2451133741Sjmg while (kq->kq_knlistsize > fd && 2452133741Sjmg (kn = SLIST_FIRST(&kq->kq_knlist[fd])) != NULL) { 2453133741Sjmg if (kn->kn_status & KN_INFLUX) { 2454133741Sjmg /* someone else might be waiting on our knote */ 2455133741Sjmg if (influx) 2456133741Sjmg wakeup(kq); 2457133741Sjmg kq->kq_state |= KQ_FLUXWAIT; 2458133741Sjmg msleep(kq, &kq->kq_lock, PSOCK, "kqflxwt", 0); 2459133741Sjmg goto again; 2460133741Sjmg } 2461133741Sjmg kn->kn_status |= KN_INFLUX; 2462133741Sjmg KQ_UNLOCK(kq); 2463134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 2464134859Sjmg kn->kn_fop->f_detach(kn); 2465133741Sjmg knote_drop(kn, td); 2466133741Sjmg influx = 1; 2467133741Sjmg KQ_LOCK(kq); 2468133741Sjmg } 2469133741Sjmg KQ_UNLOCK_FLUX(kq); 2470133741Sjmg } 247159290Sjlemon} 247259290Sjlemon 2473133741Sjmgstatic int 2474133741Sjmgknote_attach(struct knote *kn, struct kqueue *kq) 247559290Sjlemon{ 2476133741Sjmg struct klist *list; 247759290Sjlemon 2478133741Sjmg KASSERT(kn->kn_status & KN_INFLUX, ("knote not marked INFLUX")); 2479133741Sjmg KQ_OWNED(kq); 248089306Salfred 2481341083Smarkj if ((kq->kq_state & KQ_CLOSING) != 0) 2482341083Smarkj return (EBADF); 2483133741Sjmg if (kn->kn_fop->f_isfd) { 2484133741Sjmg if (kn->kn_id >= kq->kq_knlistsize) 2485311046Skib return (ENOMEM); 2486133741Sjmg list = &kq->kq_knlist[kn->kn_id]; 2487133741Sjmg } else { 2488133741Sjmg if (kq->kq_knhash == NULL) 2489311046Skib return (ENOMEM); 2490133741Sjmg list = &kq->kq_knhash[KN_HASH(kn->kn_id, kq->kq_knhashmask)]; 249159290Sjlemon } 249259290Sjlemon SLIST_INSERT_HEAD(list, kn, kn_link); 2493311046Skib return (0); 249459290Sjlemon} 249559290Sjlemon 249659290Sjlemon/* 2497151260Sambrisko * knote must already have been detached using the f_detach method. 2498133741Sjmg * no lock need to be held, it is assumed that the KN_INFLUX flag is set 2499133741Sjmg * to prevent other removal. 250059290Sjlemon */ 250159290Sjlemonstatic void 250283366Sjulianknote_drop(struct knote *kn, struct thread *td) 250359290Sjlemon{ 2504133741Sjmg struct kqueue *kq; 250559290Sjlemon struct klist *list; 250659290Sjlemon 2507133741Sjmg kq = kn->kn_kq; 2508133741Sjmg 2509133741Sjmg KQ_NOTOWNED(kq); 2510133741Sjmg KASSERT((kn->kn_status & KN_INFLUX) == KN_INFLUX, 2511133741Sjmg ("knote_drop called without KN_INFLUX set in kn_status")); 2512133741Sjmg 2513133741Sjmg KQ_LOCK(kq); 251459290Sjlemon if (kn->kn_fop->f_isfd) 2515133741Sjmg list = &kq->kq_knlist[kn->kn_id]; 251659290Sjlemon else 2517133741Sjmg list = &kq->kq_knhash[KN_HASH(kn->kn_id, kq->kq_knhashmask)]; 251859290Sjlemon 2519151260Sambrisko if (!SLIST_EMPTY(list)) 2520151260Sambrisko SLIST_REMOVE(list, kn, knote, kn_link); 252159290Sjlemon if (kn->kn_status & KN_QUEUED) 252259290Sjlemon knote_dequeue(kn); 2523133741Sjmg KQ_UNLOCK_FLUX(kq); 2524133741Sjmg 2525133741Sjmg if (kn->kn_fop->f_isfd) { 2526133741Sjmg fdrop(kn->kn_fp, td); 2527133741Sjmg kn->kn_fp = NULL; 2528133741Sjmg } 2529133741Sjmg kqueue_fo_release(kn->kn_kevent.filter); 2530133741Sjmg kn->kn_fop = NULL; 253159290Sjlemon knote_free(kn); 253259290Sjlemon} 253359290Sjlemon 253459290Sjlemonstatic void 253559290Sjlemonknote_enqueue(struct knote *kn) 253659290Sjlemon{ 253759290Sjlemon struct kqueue *kq = kn->kn_kq; 253859290Sjlemon 2539133741Sjmg KQ_OWNED(kn->kn_kq); 254059997Sjlemon KASSERT((kn->kn_status & KN_QUEUED) == 0, ("knote already queued")); 254159997Sjlemon 2542133590Srwatson TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); 254359290Sjlemon kn->kn_status |= KN_QUEUED; 254459290Sjlemon kq->kq_count++; 254559290Sjlemon kqueue_wakeup(kq); 254659290Sjlemon} 254759290Sjlemon 254859290Sjlemonstatic void 254959290Sjlemonknote_dequeue(struct knote *kn) 255059290Sjlemon{ 255159290Sjlemon struct kqueue *kq = kn->kn_kq; 255259290Sjlemon 2553133741Sjmg KQ_OWNED(kn->kn_kq); 255459997Sjlemon KASSERT(kn->kn_status & KN_QUEUED, ("knote not queued")); 255559997Sjlemon 2556133590Srwatson TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); 255759290Sjlemon kn->kn_status &= ~KN_QUEUED; 255859290Sjlemon kq->kq_count--; 255959290Sjlemon} 256059290Sjlemon 256159290Sjlemonstatic void 256259290Sjlemonknote_init(void) 256359290Sjlemon{ 2564133741Sjmg 256592751Sjeff knote_zone = uma_zcreate("KNOTE", sizeof(struct knote), NULL, NULL, 256692751Sjeff NULL, NULL, UMA_ALIGN_PTR, 0); 256759290Sjlemon} 2568177253SrwatsonSYSINIT(knote, SI_SUB_PSEUDO, SI_ORDER_ANY, knote_init, NULL); 256959290Sjlemon 257059290Sjlemonstatic struct knote * 2571133741Sjmgknote_alloc(int waitok) 257259290Sjlemon{ 2573287362Skib 2574287362Skib return (uma_zalloc(knote_zone, (waitok ? M_WAITOK : M_NOWAIT) | 2575287362Skib M_ZERO)); 257659290Sjlemon} 257759290Sjlemon 257859290Sjlemonstatic void 257959290Sjlemonknote_free(struct knote *kn) 258059290Sjlemon{ 2581287362Skib 2582287362Skib uma_zfree(knote_zone, kn); 258359290Sjlemon} 2584162594Sjmg 2585162594Sjmg/* 2586162594Sjmg * Register the kev w/ the kq specified by fd. 2587162594Sjmg */ 2588162594Sjmgint 2589162594Sjmgkqfd_register(int fd, struct kevent *kev, struct thread *td, int waitok) 2590162594Sjmg{ 2591162594Sjmg struct kqueue *kq; 2592162594Sjmg struct file *fp; 2593255219Spjd cap_rights_t rights; 2594162594Sjmg int error; 2595162594Sjmg 2596258181Spjd error = fget(td, fd, cap_rights_init(&rights, CAP_KQUEUE_CHANGE), &fp); 2597255219Spjd if (error != 0) 2598162594Sjmg return (error); 2599170029Srwatson if ((error = kqueue_acquire(fp, &kq)) != 0) 2600170029Srwatson goto noacquire; 2601162594Sjmg 2602162594Sjmg error = kqueue_register(kq, kev, td, waitok); 2603162594Sjmg kqueue_release(kq, 0); 2604162594Sjmg 2605170029Srwatsonnoacquire: 2606162608Sjmg fdrop(fp, td); 2607311046Skib return (error); 2608162594Sjmg} 2609