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: releng/11.0/sys/kern/kern_event.c 303216 2016-07-23 08:23:57Z kib $"); 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> 51251803Sed#include <sys/stdatomic.h> 5259290Sjlemon#include <sys/queue.h> 5359290Sjlemon#include <sys/event.h> 5459290Sjlemon#include <sys/eventvar.h> 5559290Sjlemon#include <sys/poll.h> 5659290Sjlemon#include <sys/protosw.h> 57256849Skib#include <sys/resourcevar.h> 58132138Salfred#include <sys/sigio.h> 59132138Salfred#include <sys/signalvar.h> 6059290Sjlemon#include <sys/socket.h> 6159290Sjlemon#include <sys/socketvar.h> 6259290Sjlemon#include <sys/stat.h> 6384138Sjlemon#include <sys/sysctl.h> 6459290Sjlemon#include <sys/sysproto.h> 65142934Sps#include <sys/syscallsubr.h> 66133741Sjmg#include <sys/taskqueue.h> 6759290Sjlemon#include <sys/uio.h> 68271976Sjhb#include <sys/user.h> 69162592Sjmg#ifdef KTRACE 70162592Sjmg#include <sys/ktrace.h> 71162592Sjmg#endif 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); 15479989Sjlemonstatic int filt_timer(struct knote *kn, long hint); 155197241Sssonstatic int filt_userattach(struct knote *kn); 156197241Sssonstatic void filt_userdetach(struct knote *kn); 157197241Sssonstatic int filt_user(struct knote *kn, long hint); 158197294Srdivackystatic void filt_usertouch(struct knote *kn, struct kevent *kev, 159197407Srdivacky u_long type); 16072521Sjlemon 161197134Srwatsonstatic struct filterops file_filtops = { 162197134Srwatson .f_isfd = 1, 163197134Srwatson .f_attach = filt_fileattach, 164197134Srwatson}; 165197134Srwatsonstatic struct filterops kqread_filtops = { 166197134Srwatson .f_isfd = 1, 167197134Srwatson .f_detach = filt_kqdetach, 168197134Srwatson .f_event = filt_kqueue, 169197134Srwatson}; 170133741Sjmg/* XXX - move to kern_proc.c? */ 171197134Srwatsonstatic struct filterops proc_filtops = { 172197134Srwatson .f_isfd = 0, 173197134Srwatson .f_attach = filt_procattach, 174197134Srwatson .f_detach = filt_procdetach, 175197134Srwatson .f_event = filt_proc, 176197134Srwatson}; 177197134Srwatsonstatic struct filterops timer_filtops = { 178197134Srwatson .f_isfd = 0, 179197134Srwatson .f_attach = filt_timerattach, 180197134Srwatson .f_detach = filt_timerdetach, 181197134Srwatson .f_event = filt_timer, 182197134Srwatson}; 183197241Sssonstatic struct filterops user_filtops = { 184197241Ssson .f_attach = filt_userattach, 185197241Ssson .f_detach = filt_userdetach, 186197241Ssson .f_event = filt_user, 187197241Ssson .f_touch = filt_usertouch, 188197241Ssson}; 18972521Sjlemon 19092751Sjeffstatic uma_zone_t knote_zone; 191251803Sedstatic atomic_uint kq_ncallouts = ATOMIC_VAR_INIT(0); 192251803Sedstatic unsigned int kq_calloutmax = 4 * 1024; 193251803SedSYSCTL_UINT(_kern, OID_AUTO, kq_calloutmax, CTLFLAG_RW, 19484138Sjlemon &kq_calloutmax, 0, "Maximum number of callouts allocated for kqueue"); 19559290Sjlemon 196133741Sjmg/* XXX - ensure not KN_INFLUX?? */ 197133741Sjmg#define KNOTE_ACTIVATE(kn, islock) do { \ 198133741Sjmg if ((islock)) \ 199133741Sjmg mtx_assert(&(kn)->kn_kq->kq_lock, MA_OWNED); \ 200133741Sjmg else \ 201133741Sjmg KQ_LOCK((kn)->kn_kq); \ 202133741Sjmg (kn)->kn_status |= KN_ACTIVE; \ 203133741Sjmg if (((kn)->kn_status & (KN_QUEUED | KN_DISABLED)) == 0) \ 204133741Sjmg knote_enqueue((kn)); \ 205133741Sjmg if (!(islock)) \ 206133741Sjmg KQ_UNLOCK((kn)->kn_kq); \ 20759290Sjlemon} while(0) 208133741Sjmg#define KQ_LOCK(kq) do { \ 209133741Sjmg mtx_lock(&(kq)->kq_lock); \ 210133741Sjmg} while (0) 211133741Sjmg#define KQ_FLUX_WAKEUP(kq) do { \ 212133741Sjmg if (((kq)->kq_state & KQ_FLUXWAIT) == KQ_FLUXWAIT) { \ 213133741Sjmg (kq)->kq_state &= ~KQ_FLUXWAIT; \ 214133741Sjmg wakeup((kq)); \ 215133741Sjmg } \ 216133741Sjmg} while (0) 217133741Sjmg#define KQ_UNLOCK_FLUX(kq) do { \ 218133741Sjmg KQ_FLUX_WAKEUP(kq); \ 219133741Sjmg mtx_unlock(&(kq)->kq_lock); \ 220133741Sjmg} while (0) 221133741Sjmg#define KQ_UNLOCK(kq) do { \ 222133741Sjmg mtx_unlock(&(kq)->kq_lock); \ 223133741Sjmg} while (0) 224133741Sjmg#define KQ_OWNED(kq) do { \ 225133741Sjmg mtx_assert(&(kq)->kq_lock, MA_OWNED); \ 226133741Sjmg} while (0) 227133741Sjmg#define KQ_NOTOWNED(kq) do { \ 228133741Sjmg mtx_assert(&(kq)->kq_lock, MA_NOTOWNED); \ 229133741Sjmg} while (0) 230302235Skib 231302235Skibstatic struct knlist * 232302235Skibkn_list_lock(struct knote *kn) 233302235Skib{ 234302235Skib struct knlist *knl; 235302235Skib 236302235Skib knl = kn->kn_knlist; 237302235Skib if (knl != NULL) 238302235Skib knl->kl_lock(knl->kl_lockarg); 239302235Skib return (knl); 240302235Skib} 241302235Skib 242302235Skibstatic void 243302235Skibkn_list_unlock(struct knlist *knl) 244302235Skib{ 245302235Skib bool do_free; 246302235Skib 247302235Skib if (knl == NULL) 248302235Skib return; 249302235Skib do_free = knl->kl_autodestroy && knlist_empty(knl); 250302235Skib knl->kl_unlock(knl->kl_lockarg); 251302235Skib if (do_free) { 252302235Skib knlist_destroy(knl); 253302235Skib free(knl, M_KQUEUE); 254302235Skib } 255302235Skib} 256302235Skib 257147730Sssouhlal#define KNL_ASSERT_LOCK(knl, islocked) do { \ 258147730Sssouhlal if (islocked) \ 259147730Sssouhlal KNL_ASSERT_LOCKED(knl); \ 260147730Sssouhlal else \ 261147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); \ 262147730Sssouhlal} while (0) 263147730Sssouhlal#ifdef INVARIANTS 264147730Sssouhlal#define KNL_ASSERT_LOCKED(knl) do { \ 265193951Skib knl->kl_assert_locked((knl)->kl_lockarg); \ 266147730Sssouhlal} while (0) 267193951Skib#define KNL_ASSERT_UNLOCKED(knl) do { \ 268193951Skib knl->kl_assert_unlocked((knl)->kl_lockarg); \ 269147730Sssouhlal} while (0) 270147730Sssouhlal#else /* !INVARIANTS */ 271147730Sssouhlal#define KNL_ASSERT_LOCKED(knl) do {} while(0) 272147730Sssouhlal#define KNL_ASSERT_UNLOCKED(knl) do {} while (0) 273147730Sssouhlal#endif /* INVARIANTS */ 27459290Sjlemon 275260384Sadrian#ifndef KN_HASHSIZE 27659290Sjlemon#define KN_HASHSIZE 64 /* XXX should be tunable */ 277260384Sadrian#endif 278260384Sadrian 27959290Sjlemon#define KN_HASH(val, mask) (((val) ^ (val >> 8)) & (mask)) 28059290Sjlemon 28188633Salfredstatic int 28288633Salfredfilt_nullattach(struct knote *kn) 28388633Salfred{ 28488633Salfred 28588633Salfred return (ENXIO); 28688633Salfred}; 28788633Salfred 288197134Srwatsonstruct filterops null_filtops = { 289197134Srwatson .f_isfd = 0, 290197134Srwatson .f_attach = filt_nullattach, 291197134Srwatson}; 29288633Salfred 293133741Sjmg/* XXX - make SYSINIT to add these, and move into respective modules. */ 29459290Sjlemonextern struct filterops sig_filtops; 295131562Salfredextern struct filterops fs_filtops; 29659290Sjlemon 29759290Sjlemon/* 29872521Sjlemon * Table for for all system-defined filters. 29959290Sjlemon */ 300133741Sjmgstatic struct mtx filterops_lock; 301133741SjmgMTX_SYSINIT(kqueue_filterops, &filterops_lock, "protect sysfilt_ops", 302133741Sjmg MTX_DEF); 303133741Sjmgstatic struct { 304133741Sjmg struct filterops *for_fop; 305274560Sjmg int for_nolock; 306133741Sjmg int for_refcnt; 307133741Sjmg} sysfilt_ops[EVFILT_SYSCOUNT] = { 308274560Sjmg { &file_filtops, 1 }, /* EVFILT_READ */ 309274560Sjmg { &file_filtops, 1 }, /* EVFILT_WRITE */ 310133741Sjmg { &null_filtops }, /* EVFILT_AIO */ 311274560Sjmg { &file_filtops, 1 }, /* EVFILT_VNODE */ 312274560Sjmg { &proc_filtops, 1 }, /* EVFILT_PROC */ 313274560Sjmg { &sig_filtops, 1 }, /* EVFILT_SIGNAL */ 314274560Sjmg { &timer_filtops, 1 }, /* EVFILT_TIMER */ 315274560Sjmg { &file_filtops, 1 }, /* EVFILT_PROCDESC */ 316274560Sjmg { &fs_filtops, 1 }, /* EVFILT_FS */ 317151260Sambrisko { &null_filtops }, /* EVFILT_LIO */ 318274560Sjmg { &user_filtops, 1 }, /* EVFILT_USER */ 319260805Sadrian { &null_filtops }, /* EVFILT_SENDFILE */ 32059290Sjlemon}; 32159290Sjlemon 322133741Sjmg/* 323133741Sjmg * Simple redirection for all cdevsw style objects to call their fo_kqfilter 324133741Sjmg * method. 325133741Sjmg */ 32659290Sjlemonstatic int 32772521Sjlemonfilt_fileattach(struct knote *kn) 32859290Sjlemon{ 329133635Sjmg 33072521Sjlemon return (fo_kqfilter(kn->kn_fp, kn)); 33159290Sjlemon} 33259290Sjlemon 33372521Sjlemon/*ARGSUSED*/ 334255675Srdivackystatic int 33572521Sjlemonkqueue_kqfilter(struct file *fp, struct knote *kn) 33659290Sjlemon{ 337109153Sdillon struct kqueue *kq = kn->kn_fp->f_data; 33859290Sjlemon 33972521Sjlemon if (kn->kn_filter != EVFILT_READ) 340133741Sjmg return (EINVAL); 34159290Sjlemon 342133741Sjmg kn->kn_status |= KN_KQUEUE; 34372521Sjlemon kn->kn_fop = &kqread_filtops; 344133741Sjmg knlist_add(&kq->kq_sel.si_note, kn, 0); 345133741Sjmg 34659290Sjlemon return (0); 34759290Sjlemon} 34859290Sjlemon 34959290Sjlemonstatic void 35059290Sjlemonfilt_kqdetach(struct knote *kn) 35159290Sjlemon{ 352109153Sdillon struct kqueue *kq = kn->kn_fp->f_data; 35359290Sjlemon 354133741Sjmg knlist_remove(&kq->kq_sel.si_note, kn, 0); 35559290Sjlemon} 35659290Sjlemon 35759290Sjlemon/*ARGSUSED*/ 35859290Sjlemonstatic int 35959290Sjlemonfilt_kqueue(struct knote *kn, long hint) 36059290Sjlemon{ 361109153Sdillon struct kqueue *kq = kn->kn_fp->f_data; 36259290Sjlemon 36359290Sjlemon kn->kn_data = kq->kq_count; 36459290Sjlemon return (kn->kn_data > 0); 36559290Sjlemon} 36659290Sjlemon 367133741Sjmg/* XXX - move to kern_proc.c? */ 36859290Sjlemonstatic int 36959290Sjlemonfilt_procattach(struct knote *kn) 37059290Sjlemon{ 37159290Sjlemon struct proc *p; 37275451Srwatson int error; 373302235Skib bool exiting, immediate; 37459290Sjlemon 375302235Skib exiting = immediate = false; 37659290Sjlemon p = pfind(kn->kn_id); 377113377Skbyanc if (p == NULL && (kn->kn_sfflags & NOTE_EXIT)) { 378113377Skbyanc p = zpfind(kn->kn_id); 379302235Skib exiting = true; 380133741Sjmg } else if (p != NULL && (p->p_flag & P_WEXIT)) { 381302235Skib exiting = true; 382113377Skbyanc } 383133741Sjmg 384122019Scognet if (p == NULL) 385122019Scognet return (ESRCH); 386203875Skib if ((error = p_cansee(curthread, p))) { 387203875Skib PROC_UNLOCK(p); 38875451Srwatson return (error); 389203875Skib } 39059290Sjlemon 39159290Sjlemon kn->kn_ptr.p_proc = p; 39259290Sjlemon kn->kn_flags |= EV_CLEAR; /* automatically set */ 39359290Sjlemon 39459290Sjlemon /* 395295012Svangyzen * Internal flag indicating registration done by kernel for the 396295012Svangyzen * purposes of getting a NOTE_CHILD notification. 39759290Sjlemon */ 398295012Svangyzen if (kn->kn_flags & EV_FLAG2) { 399295012Svangyzen kn->kn_flags &= ~EV_FLAG2; 40059290Sjlemon kn->kn_data = kn->kn_sdata; /* ppid */ 40159290Sjlemon kn->kn_fflags = NOTE_CHILD; 402302235Skib kn->kn_sfflags &= ~(NOTE_EXIT | NOTE_EXEC | NOTE_FORK); 403302235Skib immediate = true; /* Force immediate activation of child note. */ 404295012Svangyzen } 405295012Svangyzen /* 406295012Svangyzen * Internal flag indicating registration done by kernel (for other than 407295012Svangyzen * NOTE_CHILD). 408295012Svangyzen */ 409295012Svangyzen if (kn->kn_flags & EV_FLAG1) { 41059290Sjlemon kn->kn_flags &= ~EV_FLAG1; 41159290Sjlemon } 41259290Sjlemon 413302235Skib knlist_add(p->p_klist, kn, 1); 414113377Skbyanc 415113377Skbyanc /* 416295012Svangyzen * Immediately activate any child notes or, in the case of a zombie 417295012Svangyzen * target process, exit notes. The latter is necessary to handle the 418295012Svangyzen * case where the target process, e.g. a child, dies before the kevent 419295012Svangyzen * is registered. 420113377Skbyanc */ 421302235Skib if (immediate || (exiting && filt_proc(kn, NOTE_EXIT))) 422133741Sjmg KNOTE_ACTIVATE(kn, 0); 423113377Skbyanc 42471500Sjhb PROC_UNLOCK(p); 42559290Sjlemon 42659290Sjlemon return (0); 42759290Sjlemon} 42859290Sjlemon 42959290Sjlemon/* 43059290Sjlemon * The knote may be attached to a different process, which may exit, 43159290Sjlemon * leaving nothing for the knote to be attached to. So when the process 43259290Sjlemon * exits, the knote is marked as DETACHED and also flagged as ONESHOT so 43359290Sjlemon * it will be deleted when read out. However, as part of the knote deletion, 43459290Sjlemon * this routine is called, so a check is needed to avoid actually performing 43559290Sjlemon * a detach, because the original process does not exist any more. 43659290Sjlemon */ 437133741Sjmg/* XXX - move to kern_proc.c? */ 43859290Sjlemonstatic void 43959290Sjlemonfilt_procdetach(struct knote *kn) 44059290Sjlemon{ 44159290Sjlemon 442302235Skib knlist_remove(kn->kn_knlist, kn, 0); 443133741Sjmg kn->kn_ptr.p_proc = NULL; 44459290Sjlemon} 44559290Sjlemon 446133741Sjmg/* XXX - move to kern_proc.c? */ 44759290Sjlemonstatic int 44859290Sjlemonfilt_proc(struct knote *kn, long hint) 44959290Sjlemon{ 450264231Sed struct proc *p; 45159290Sjlemon u_int event; 45259290Sjlemon 453264231Sed p = kn->kn_ptr.p_proc; 454302308Skib if (p == NULL) /* already activated, from attach filter */ 455302308Skib return (0); 456302308Skib 457264231Sed /* Mask off extra data. */ 45859290Sjlemon event = (u_int)hint & NOTE_PCTRLMASK; 45959290Sjlemon 460264231Sed /* If the user is interested in this event, record it. */ 46159290Sjlemon if (kn->kn_sfflags & event) 46259290Sjlemon kn->kn_fflags |= event; 46359290Sjlemon 464264231Sed /* Process is gone, so flag the event as finished. */ 46559290Sjlemon if (event == NOTE_EXIT) { 466264231Sed kn->kn_flags |= EV_EOF | EV_ONESHOT; 467133741Sjmg kn->kn_ptr.p_proc = NULL; 468254072Sjhb if (kn->kn_fflags & NOTE_EXIT) 469285670Skib kn->kn_data = KW_EXITCODE(p->p_xexit, p->p_xsig); 470254072Sjhb if (kn->kn_fflags == 0) 471254072Sjhb kn->kn_flags |= EV_DROP; 47259290Sjlemon return (1); 47359290Sjlemon } 47459290Sjlemon 475180340Skib return (kn->kn_fflags != 0); 476180340Skib} 47759290Sjlemon 478180340Skib/* 479180340Skib * Called when the process forked. It mostly does the same as the 480180340Skib * knote(), activating all knotes registered to be activated when the 481180340Skib * process forked. Additionally, for each knote attached to the 482180340Skib * parent, check whether user wants to track the new process. If so 483180340Skib * attach a new knote to it, and immediately report an event with the 484180340Skib * child's pid. 485180340Skib */ 486180340Skibvoid 487180340Skibknote_fork(struct knlist *list, int pid) 488180340Skib{ 489180340Skib struct kqueue *kq; 490180340Skib struct knote *kn; 491180340Skib struct kevent kev; 492180340Skib int error; 493180340Skib 494180340Skib if (list == NULL) 495180340Skib return; 496180340Skib list->kl_lock(list->kl_lockarg); 497180340Skib 498180340Skib SLIST_FOREACH(kn, &list->kl_list, kn_selnext) { 499180340Skib kq = kn->kn_kq; 500180340Skib KQ_LOCK(kq); 501264146Skib if ((kn->kn_status & (KN_INFLUX | KN_SCAN)) == KN_INFLUX) { 502180340Skib KQ_UNLOCK(kq); 503180340Skib continue; 504180340Skib } 505180340Skib 50659290Sjlemon /* 507180340Skib * The same as knote(), activate the event. 50859290Sjlemon */ 509180340Skib if ((kn->kn_sfflags & NOTE_TRACK) == 0) { 510180340Skib kn->kn_status |= KN_HASKQLOCK; 511254287Sjhb if (kn->kn_fop->f_event(kn, NOTE_FORK)) 512180340Skib KNOTE_ACTIVATE(kn, 1); 513180340Skib kn->kn_status &= ~KN_HASKQLOCK; 514180340Skib KQ_UNLOCK(kq); 515180340Skib continue; 516180340Skib } 517180340Skib 518180340Skib /* 519180340Skib * The NOTE_TRACK case. In addition to the activation 520295012Svangyzen * of the event, we need to register new events to 521180340Skib * track the child. Drop the locks in preparation for 522180340Skib * the call to kqueue_register(). 523180340Skib */ 524180340Skib kn->kn_status |= KN_INFLUX; 525180340Skib KQ_UNLOCK(kq); 526180340Skib list->kl_unlock(list->kl_lockarg); 527180340Skib 528180340Skib /* 529295012Svangyzen * Activate existing knote and register tracking knotes with 530180340Skib * new process. 531295012Svangyzen * 532295012Svangyzen * First register a knote to get just the child notice. This 533295012Svangyzen * must be a separate note from a potential NOTE_EXIT 534295012Svangyzen * notification since both NOTE_CHILD and NOTE_EXIT are defined 535295012Svangyzen * to use the data field (in conflicting ways). 536180340Skib */ 537180340Skib kev.ident = pid; 53859290Sjlemon kev.filter = kn->kn_filter; 539302235Skib kev.flags = kn->kn_flags | EV_ADD | EV_ENABLE | EV_ONESHOT | 540302235Skib EV_FLAG2; 541295012Svangyzen kev.fflags = kn->kn_sfflags; 542295012Svangyzen kev.data = kn->kn_id; /* parent */ 543295012Svangyzen kev.udata = kn->kn_kevent.udata;/* preserve udata */ 544295012Svangyzen error = kqueue_register(kq, &kev, NULL, 0); 545295012Svangyzen if (error) 546295012Svangyzen kn->kn_fflags |= NOTE_TRACKERR; 547295012Svangyzen 548295012Svangyzen /* 549295012Svangyzen * Then register another knote to track other potential events 550295012Svangyzen * from the new process. 551295012Svangyzen */ 552295012Svangyzen kev.ident = pid; 553295012Svangyzen kev.filter = kn->kn_filter; 55459290Sjlemon kev.flags = kn->kn_flags | EV_ADD | EV_ENABLE | EV_FLAG1; 55559290Sjlemon kev.fflags = kn->kn_sfflags; 556180340Skib kev.data = kn->kn_id; /* parent */ 557180340Skib kev.udata = kn->kn_kevent.udata;/* preserve udata */ 558180340Skib error = kqueue_register(kq, &kev, NULL, 0); 55959290Sjlemon if (error) 56059290Sjlemon kn->kn_fflags |= NOTE_TRACKERR; 561254287Sjhb if (kn->kn_fop->f_event(kn, NOTE_FORK)) 562254287Sjhb KNOTE_ACTIVATE(kn, 0); 563180340Skib KQ_LOCK(kq); 564180340Skib kn->kn_status &= ~KN_INFLUX; 565180340Skib KQ_UNLOCK_FLUX(kq); 566180340Skib list->kl_lock(list->kl_lockarg); 56759290Sjlemon } 568180340Skib list->kl_unlock(list->kl_lockarg); 56959290Sjlemon} 57059290Sjlemon 571238424Sjhb/* 572238424Sjhb * XXX: EVFILT_TIMER should perhaps live in kern_time.c beside the 573238424Sjhb * interval timer support code. 574238424Sjhb */ 575268843Sbapt 576268843Sbapt#define NOTE_TIMER_PRECMASK (NOTE_SECONDS|NOTE_MSECONDS|NOTE_USECONDS| \ 577268843Sbapt NOTE_NSECONDS) 578268843Sbapt 579296775Sgibbsstatic sbintime_t 580268843Sbapttimer2sbintime(intptr_t data, int flags) 581133741Sjmg{ 582259633Sse 583296775Sgibbs /* 584296775Sgibbs * Macros for converting to the fractional second portion of an 585296775Sgibbs * sbintime_t using 64bit multiplication to improve precision. 586296775Sgibbs */ 587296775Sgibbs#define NS_TO_SBT(ns) (((ns) * (((uint64_t)1 << 63) / 500000000)) >> 32) 588296775Sgibbs#define US_TO_SBT(us) (((us) * (((uint64_t)1 << 63) / 500000)) >> 32) 589296775Sgibbs#define MS_TO_SBT(ms) (((ms) * (((uint64_t)1 << 63) / 500)) >> 32) 590268843Sbapt switch (flags & NOTE_TIMER_PRECMASK) { 591268843Sbapt case NOTE_SECONDS: 592296775Sgibbs#ifdef __LP64__ 593296775Sgibbs if (data > (SBT_MAX / SBT_1S)) 594296775Sgibbs return SBT_MAX; 595296775Sgibbs#endif 596296775Sgibbs return ((sbintime_t)data << 32); 597268843Sbapt case NOTE_MSECONDS: /* FALLTHROUGH */ 598268843Sbapt case 0: 599296775Sgibbs if (data >= 1000) { 600296775Sgibbs int64_t secs = data / 1000; 601296775Sgibbs#ifdef __LP64__ 602296775Sgibbs if (secs > (SBT_MAX / SBT_1S)) 603296775Sgibbs return SBT_MAX; 604296775Sgibbs#endif 605296775Sgibbs return (secs << 32 | MS_TO_SBT(data % 1000)); 606296775Sgibbs } 607296775Sgibbs return MS_TO_SBT(data); 608268843Sbapt case NOTE_USECONDS: 609296775Sgibbs if (data >= 1000000) { 610296775Sgibbs int64_t secs = data / 1000000; 611296775Sgibbs#ifdef __LP64__ 612296775Sgibbs if (secs > (SBT_MAX / SBT_1S)) 613296775Sgibbs return SBT_MAX; 614296775Sgibbs#endif 615296775Sgibbs return (secs << 32 | US_TO_SBT(data % 1000000)); 616296775Sgibbs } 617296775Sgibbs return US_TO_SBT(data); 618268843Sbapt case NOTE_NSECONDS: 619296775Sgibbs if (data >= 1000000000) { 620296775Sgibbs int64_t secs = data / 1000000000; 621296775Sgibbs#ifdef __LP64__ 622296775Sgibbs if (secs > (SBT_MAX / SBT_1S)) 623296775Sgibbs return SBT_MAX; 624296775Sgibbs#endif 625296775Sgibbs return (secs << 32 | US_TO_SBT(data % 1000000000)); 626296775Sgibbs } 627296775Sgibbs return NS_TO_SBT(data); 628296775Sgibbs default: 629268843Sbapt break; 630268843Sbapt } 631296775Sgibbs return (-1); 632133741Sjmg} 633133741Sjmg 63479989Sjlemonstatic void 63579989Sjlemonfilt_timerexpire(void *knx) 63679989Sjlemon{ 63784138Sjlemon struct callout *calloutp; 638247804Sdavide struct knote *kn; 63979989Sjlemon 640247804Sdavide kn = knx; 64179989Sjlemon kn->kn_data++; 642133741Sjmg KNOTE_ACTIVATE(kn, 0); /* XXX - handle locking */ 64379989Sjlemon 644133741Sjmg if ((kn->kn_flags & EV_ONESHOT) != EV_ONESHOT) { 64584138Sjlemon calloutp = (struct callout *)kn->kn_hook; 646272528Sian *kn->kn_ptr.p_nexttime += timer2sbintime(kn->kn_sdata, 647272528Sian kn->kn_sfflags); 648272528Sian callout_reset_sbt_on(calloutp, *kn->kn_ptr.p_nexttime, 0, 649272528Sian filt_timerexpire, kn, PCPU_GET(cpuid), C_ABSOLUTE); 65079989Sjlemon } 65179989Sjlemon} 65279989Sjlemon 65379989Sjlemon/* 654268843Sbapt * data contains amount of time to sleep 655133590Srwatson */ 65679989Sjlemonstatic int 65779989Sjlemonfilt_timerattach(struct knote *kn) 65879989Sjlemon{ 65984138Sjlemon struct callout *calloutp; 660255882Skib sbintime_t to; 661251803Sed unsigned int ncallouts; 66279989Sjlemon 663255882Skib if ((intptr_t)kn->kn_sdata < 0) 664255882Skib return (EINVAL); 665255882Skib if ((intptr_t)kn->kn_sdata == 0 && (kn->kn_flags & EV_ONESHOT) == 0) 666255882Skib kn->kn_sdata = 1; 667268843Sbapt /* Only precision unit are supported in flags so far */ 668268843Sbapt if (kn->kn_sfflags & ~NOTE_TIMER_PRECMASK) 669268843Sbapt return (EINVAL); 670268843Sbapt 671268843Sbapt to = timer2sbintime(kn->kn_sdata, kn->kn_sfflags); 672255882Skib if (to < 0) 673255882Skib return (EINVAL); 674255882Skib 675251803Sed ncallouts = atomic_load_explicit(&kq_ncallouts, memory_order_relaxed); 676251803Sed do { 677251803Sed if (ncallouts >= kq_calloutmax) 678251803Sed return (ENOMEM); 679251803Sed } while (!atomic_compare_exchange_weak_explicit(&kq_ncallouts, 680251803Sed &ncallouts, ncallouts + 1, memory_order_relaxed, 681251803Sed memory_order_relaxed)); 682133741Sjmg 68379989Sjlemon kn->kn_flags |= EV_CLEAR; /* automatically set */ 684254932Sjmg kn->kn_status &= ~KN_DETACHED; /* knlist_add clears it */ 685272528Sian kn->kn_ptr.p_nexttime = malloc(sizeof(sbintime_t), M_KQUEUE, M_WAITOK); 686184214Sdes calloutp = malloc(sizeof(*calloutp), M_KQUEUE, M_WAITOK); 687283291Sjkim callout_init(calloutp, 1); 688127982Scperciva kn->kn_hook = calloutp; 689272528Sian *kn->kn_ptr.p_nexttime = to + sbinuptime(); 690272528Sian callout_reset_sbt_on(calloutp, *kn->kn_ptr.p_nexttime, 0, 691272528Sian filt_timerexpire, kn, PCPU_GET(cpuid), C_ABSOLUTE); 69279989Sjlemon 69379989Sjlemon return (0); 69479989Sjlemon} 69579989Sjlemon 69679989Sjlemonstatic void 69779989Sjlemonfilt_timerdetach(struct knote *kn) 69879989Sjlemon{ 69984138Sjlemon struct callout *calloutp; 700251803Sed unsigned int old; 70179989Sjlemon 70284138Sjlemon calloutp = (struct callout *)kn->kn_hook; 703127982Scperciva callout_drain(calloutp); 704184205Sdes free(calloutp, M_KQUEUE); 705272528Sian free(kn->kn_ptr.p_nexttime, M_KQUEUE); 706251803Sed old = atomic_fetch_sub_explicit(&kq_ncallouts, 1, memory_order_relaxed); 707251803Sed KASSERT(old > 0, ("Number of callouts cannot become negative")); 708254932Sjmg kn->kn_status |= KN_DETACHED; /* knlist_remove sets it */ 70979989Sjlemon} 71079989Sjlemon 71179989Sjlemonstatic int 71279989Sjlemonfilt_timer(struct knote *kn, long hint) 71379989Sjlemon{ 71479989Sjlemon 71579989Sjlemon return (kn->kn_data != 0); 71679989Sjlemon} 71779989Sjlemon 718197241Sssonstatic int 719197241Sssonfilt_userattach(struct knote *kn) 720197241Ssson{ 721197241Ssson 722197241Ssson /* 723197241Ssson * EVFILT_USER knotes are not attached to anything in the kernel. 724197241Ssson */ 725197241Ssson kn->kn_hook = NULL; 726197241Ssson if (kn->kn_fflags & NOTE_TRIGGER) 727197241Ssson kn->kn_hookid = 1; 728197241Ssson else 729197241Ssson kn->kn_hookid = 0; 730197241Ssson return (0); 731197241Ssson} 732197241Ssson 733197241Sssonstatic void 734197241Sssonfilt_userdetach(__unused struct knote *kn) 735197241Ssson{ 736197241Ssson 737197241Ssson /* 738197241Ssson * EVFILT_USER knotes are not attached to anything in the kernel. 739197241Ssson */ 740197241Ssson} 741197241Ssson 742197241Sssonstatic int 743197241Sssonfilt_user(struct knote *kn, __unused long hint) 744197241Ssson{ 745197241Ssson 746197241Ssson return (kn->kn_hookid); 747197241Ssson} 748197241Ssson 749197241Sssonstatic void 750197407Srdivackyfilt_usertouch(struct knote *kn, struct kevent *kev, u_long type) 751197241Ssson{ 752197407Srdivacky u_int ffctrl; 753197241Ssson 754197241Ssson switch (type) { 755197241Ssson case EVENT_REGISTER: 756197241Ssson if (kev->fflags & NOTE_TRIGGER) 757197241Ssson kn->kn_hookid = 1; 758197241Ssson 759197241Ssson ffctrl = kev->fflags & NOTE_FFCTRLMASK; 760197241Ssson kev->fflags &= NOTE_FFLAGSMASK; 761197241Ssson switch (ffctrl) { 762197241Ssson case NOTE_FFNOP: 763197241Ssson break; 764197241Ssson 765197241Ssson case NOTE_FFAND: 766197241Ssson kn->kn_sfflags &= kev->fflags; 767197241Ssson break; 768197241Ssson 769197241Ssson case NOTE_FFOR: 770197241Ssson kn->kn_sfflags |= kev->fflags; 771197241Ssson break; 772197241Ssson 773197241Ssson case NOTE_FFCOPY: 774197241Ssson kn->kn_sfflags = kev->fflags; 775197241Ssson break; 776197241Ssson 777197241Ssson default: 778197241Ssson /* XXX Return error? */ 779197241Ssson break; 780197241Ssson } 781197241Ssson kn->kn_sdata = kev->data; 782197241Ssson if (kev->flags & EV_CLEAR) { 783197241Ssson kn->kn_hookid = 0; 784197241Ssson kn->kn_data = 0; 785197241Ssson kn->kn_fflags = 0; 786197241Ssson } 787197241Ssson break; 788197241Ssson 789197241Ssson case EVENT_PROCESS: 790197241Ssson *kev = kn->kn_kevent; 791197241Ssson kev->fflags = kn->kn_sfflags; 792197241Ssson kev->data = kn->kn_sdata; 793197241Ssson if (kn->kn_flags & EV_CLEAR) { 794197241Ssson kn->kn_hookid = 0; 795197241Ssson kn->kn_data = 0; 796197241Ssson kn->kn_fflags = 0; 797197241Ssson } 798197241Ssson break; 799197241Ssson 800197241Ssson default: 801197241Ssson panic("filt_usertouch() - invalid type (%ld)", type); 802197241Ssson break; 803197241Ssson } 804197241Ssson} 805197241Ssson 80661468Sjlemonint 807225617Skmacysys_kqueue(struct thread *td, struct kqueue_args *uap) 80859290Sjlemon{ 809283440Sdchagin 810286309Sed return (kern_kqueue(td, 0, NULL)); 811283440Sdchagin} 812283440Sdchagin 813286631Sedstatic void 814286631Sedkqueue_init(struct kqueue *kq) 815286631Sed{ 816286631Sed 817286631Sed mtx_init(&kq->kq_lock, "kqueue", NULL, MTX_DEF | MTX_DUPOK); 818286631Sed TAILQ_INIT(&kq->kq_head); 819286631Sed knlist_init_mtx(&kq->kq_sel.si_note, &kq->kq_lock); 820286631Sed TASK_INIT(&kq->kq_task, 0, kqueue_task, kq); 821286631Sed} 822286631Sed 823283440Sdchaginint 824286309Sedkern_kqueue(struct thread *td, int flags, struct filecaps *fcaps) 825283440Sdchagin{ 826255675Srdivacky struct filedesc *fdp; 827255675Srdivacky struct kqueue *kq; 828255675Srdivacky struct file *fp; 829256849Skib struct ucred *cred; 830255675Srdivacky int fd, error; 831255675Srdivacky 832288145Smjg fdp = td->td_proc->p_fd; 833256849Skib cred = td->td_ucred; 834288145Smjg if (!chgkqcnt(cred->cr_ruidinfo, 1, lim_cur(td, RLIMIT_KQUEUES))) 835257597Sjilles return (ENOMEM); 836256849Skib 837286309Sed error = falloc_caps(td, &fp, &fd, flags, fcaps); 838288145Smjg if (error != 0) { 839288145Smjg chgkqcnt(cred->cr_ruidinfo, -1, 0); 840288145Smjg return (error); 841288145Smjg } 842255675Srdivacky 843255675Srdivacky /* An extra reference on `fp' has been held for us by falloc(). */ 844255675Srdivacky kq = malloc(sizeof *kq, M_KQUEUE, M_WAITOK | M_ZERO); 845286631Sed kqueue_init(kq); 846255675Srdivacky kq->kq_fdp = fdp; 847288145Smjg kq->kq_cred = crhold(cred); 848255675Srdivacky 849255675Srdivacky FILEDESC_XLOCK(fdp); 850255675Srdivacky TAILQ_INSERT_HEAD(&fdp->fd_kqlist, kq, kq_list); 851255675Srdivacky FILEDESC_XUNLOCK(fdp); 852255675Srdivacky 853255675Srdivacky finit(fp, FREAD | FWRITE, DTYPE_KQUEUE, kq, &kqueueops); 854255675Srdivacky fdrop(fp, td); 855255675Srdivacky 856255675Srdivacky td->td_retval[0] = fd; 857288145Smjg return (0); 85859290Sjlemon} 85959290Sjlemon 86059290Sjlemon#ifndef _SYS_SYSPROTO_H_ 86159290Sjlemonstruct kevent_args { 86259290Sjlemon int fd; 86363977Speter const struct kevent *changelist; 86459290Sjlemon int nchanges; 86563452Sjlemon struct kevent *eventlist; 86659290Sjlemon int nevents; 86763977Speter const struct timespec *timeout; 86859290Sjlemon}; 86959290Sjlemon#endif 87059290Sjlemonint 871225617Skmacysys_kevent(struct thread *td, struct kevent_args *uap) 87259290Sjlemon{ 873142934Sps struct timespec ts, *tsp; 874146950Sps struct kevent_copyops k_ops = { uap, 875146950Sps kevent_copyout, 876146950Sps kevent_copyin}; 877142934Sps int error; 878162592Sjmg#ifdef KTRACE 879162592Sjmg struct uio ktruio; 880162592Sjmg struct iovec ktriov; 881162592Sjmg struct uio *ktruioin = NULL; 882162592Sjmg struct uio *ktruioout = NULL; 883162592Sjmg#endif 884142934Sps 885142934Sps if (uap->timeout != NULL) { 886142934Sps error = copyin(uap->timeout, &ts, sizeof(ts)); 887142934Sps if (error) 888142934Sps return (error); 889142934Sps tsp = &ts; 890142934Sps } else 891142934Sps tsp = NULL; 892142934Sps 893162592Sjmg#ifdef KTRACE 894162592Sjmg if (KTRPOINT(td, KTR_GENIO)) { 895162592Sjmg ktriov.iov_base = uap->changelist; 896162592Sjmg ktriov.iov_len = uap->nchanges * sizeof(struct kevent); 897162592Sjmg ktruio = (struct uio){ .uio_iov = &ktriov, .uio_iovcnt = 1, 898162592Sjmg .uio_segflg = UIO_USERSPACE, .uio_rw = UIO_READ, 899162592Sjmg .uio_td = td }; 900162592Sjmg ktruioin = cloneuio(&ktruio); 901162592Sjmg ktriov.iov_base = uap->eventlist; 902162592Sjmg ktriov.iov_len = uap->nevents * sizeof(struct kevent); 903162592Sjmg ktruioout = cloneuio(&ktruio); 904162592Sjmg } 905162592Sjmg#endif 906162592Sjmg 907162592Sjmg error = kern_kevent(td, uap->fd, uap->nchanges, uap->nevents, 908162592Sjmg &k_ops, tsp); 909162592Sjmg 910162592Sjmg#ifdef KTRACE 911162592Sjmg if (ktruioin != NULL) { 912162592Sjmg ktruioin->uio_resid = uap->nchanges * sizeof(struct kevent); 913162592Sjmg ktrgenio(uap->fd, UIO_WRITE, ktruioin, 0); 914162592Sjmg ktruioout->uio_resid = td->td_retval[0] * sizeof(struct kevent); 915162592Sjmg ktrgenio(uap->fd, UIO_READ, ktruioout, error); 916162592Sjmg } 917162592Sjmg#endif 918162592Sjmg 919162592Sjmg return (error); 920142934Sps} 921142934Sps 922142934Sps/* 923146950Sps * Copy 'count' items into the destination list pointed to by uap->eventlist. 924142934Sps */ 925142934Spsstatic int 926146950Spskevent_copyout(void *arg, struct kevent *kevp, int count) 927142934Sps{ 928146950Sps struct kevent_args *uap; 929142934Sps int error; 930142934Sps 931146950Sps KASSERT(count <= KQ_NEVENTS, ("count (%d) > KQ_NEVENTS", count)); 932146950Sps uap = (struct kevent_args *)arg; 933146950Sps 934146950Sps error = copyout(kevp, uap->eventlist, count * sizeof *kevp); 935146950Sps if (error == 0) 936146950Sps uap->eventlist += count; 937142934Sps return (error); 938142934Sps} 939142934Sps 940146950Sps/* 941146950Sps * Copy 'count' items from the list pointed to by uap->changelist. 942146950Sps */ 943146950Spsstatic int 944146950Spskevent_copyin(void *arg, struct kevent *kevp, int count) 945146950Sps{ 946146950Sps struct kevent_args *uap; 947146950Sps int error; 948146950Sps 949146950Sps KASSERT(count <= KQ_NEVENTS, ("count (%d) > KQ_NEVENTS", count)); 950146950Sps uap = (struct kevent_args *)arg; 951146950Sps 952146950Sps error = copyin(uap->changelist, kevp, count * sizeof *kevp); 953146950Sps if (error == 0) 954146950Sps uap->changelist += count; 955146950Sps return (error); 956146950Sps} 957146950Sps 958142934Spsint 959146950Spskern_kevent(struct thread *td, int fd, int nchanges, int nevents, 960146950Sps struct kevent_copyops *k_ops, const struct timespec *timeout) 961142934Sps{ 962283440Sdchagin cap_rights_t rights; 963255675Srdivacky struct file *fp; 964283440Sdchagin int error; 96559290Sjlemon 966258181Spjd cap_rights_init(&rights); 967258181Spjd if (nchanges > 0) 968258181Spjd cap_rights_set(&rights, CAP_KQUEUE_CHANGE); 969258181Spjd if (nevents > 0) 970258181Spjd cap_rights_set(&rights, CAP_KQUEUE_EVENT); 971258181Spjd error = fget(td, fd, &rights, &fp); 972255675Srdivacky if (error != 0) 973255675Srdivacky return (error); 974258181Spjd 975283440Sdchagin error = kern_kevent_fp(td, fp, nchanges, nevents, k_ops, timeout); 976283440Sdchagin fdrop(fp, td); 977283440Sdchagin 978283440Sdchagin return (error); 979283440Sdchagin} 980283440Sdchagin 981286631Sedstatic int 982286631Sedkqueue_kevent(struct kqueue *kq, struct thread *td, int nchanges, int nevents, 983283440Sdchagin struct kevent_copyops *k_ops, const struct timespec *timeout) 984283440Sdchagin{ 985283440Sdchagin struct kevent keva[KQ_NEVENTS]; 986283440Sdchagin struct kevent *kevp, *changes; 987283440Sdchagin int i, n, nerrors, error; 988283440Sdchagin 98959290Sjlemon nerrors = 0; 990142934Sps while (nchanges > 0) { 991146950Sps n = nchanges > KQ_NEVENTS ? KQ_NEVENTS : nchanges; 992146950Sps error = k_ops->k_copyin(k_ops->arg, keva, n); 993146950Sps if (error) 994286631Sed return (error); 995146950Sps changes = keva; 99659290Sjlemon for (i = 0; i < n; i++) { 997142934Sps kevp = &changes[i]; 998151260Sambrisko if (!kevp->filter) 999151260Sambrisko continue; 100063452Sjlemon kevp->flags &= ~EV_SYSFLAGS; 1001133741Sjmg error = kqueue_register(kq, kevp, td, 1); 1002197243Ssson if (error || (kevp->flags & EV_RECEIPT)) { 1003286631Sed if (nevents == 0) 1004286631Sed return (error); 1005286631Sed kevp->flags = EV_ERROR; 1006286631Sed kevp->data = error; 1007286631Sed (void)k_ops->k_copyout(k_ops->arg, kevp, 1); 1008286631Sed nevents--; 1009286631Sed nerrors++; 101059290Sjlemon } 101159290Sjlemon } 1012142934Sps nchanges -= n; 101359290Sjlemon } 101459290Sjlemon if (nerrors) { 1015133741Sjmg td->td_retval[0] = nerrors; 1016286631Sed return (0); 101759290Sjlemon } 101859290Sjlemon 1019286631Sed return (kqueue_scan(kq, nevents, k_ops, timeout, keva, td)); 1020286631Sed} 1021286631Sed 1022286631Sedint 1023286631Sedkern_kevent_fp(struct thread *td, struct file *fp, int nchanges, int nevents, 1024286631Sed struct kevent_copyops *k_ops, const struct timespec *timeout) 1025286631Sed{ 1026286631Sed struct kqueue *kq; 1027286631Sed int error; 1028286631Sed 1029286631Sed error = kqueue_acquire(fp, &kq); 1030286631Sed if (error != 0) 1031286631Sed return (error); 1032286631Sed error = kqueue_kevent(kq, td, nchanges, nevents, k_ops, timeout); 1033133741Sjmg kqueue_release(kq, 0); 103459290Sjlemon return (error); 103559290Sjlemon} 103659290Sjlemon 1037286681Sed/* 1038286681Sed * Performs a kevent() call on a temporarily created kqueue. This can be 1039286681Sed * used to perform one-shot polling, similar to poll() and select(). 1040286681Sed */ 104159290Sjlemonint 1042286631Sedkern_kevent_anonymous(struct thread *td, int nevents, 1043286631Sed struct kevent_copyops *k_ops) 1044286631Sed{ 1045286631Sed struct kqueue kq = {}; 1046286631Sed int error; 1047286631Sed 1048286631Sed kqueue_init(&kq); 1049286631Sed kq.kq_refcnt = 1; 1050286631Sed error = kqueue_kevent(&kq, td, nevents, nevents, k_ops, NULL); 1051286631Sed kqueue_drain(&kq, td); 1052286631Sed kqueue_destroy(&kq); 1053286631Sed return (error); 1054286631Sed} 1055286631Sed 1056286631Sedint 105788633Salfredkqueue_add_filteropts(int filt, struct filterops *filtops) 105888633Salfred{ 1059133741Sjmg int error; 106088633Salfred 1061201352Sbrooks error = 0; 1062133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) { 1063133741Sjmg printf( 1064133741Sjmg"trying to add a filterop that is out of range: %d is beyond %d\n", 1065133741Sjmg ~filt, EVFILT_SYSCOUNT); 1066133741Sjmg return EINVAL; 1067133741Sjmg } 1068133741Sjmg mtx_lock(&filterops_lock); 1069133741Sjmg if (sysfilt_ops[~filt].for_fop != &null_filtops && 1070133741Sjmg sysfilt_ops[~filt].for_fop != NULL) 1071133741Sjmg error = EEXIST; 1072133741Sjmg else { 1073133741Sjmg sysfilt_ops[~filt].for_fop = filtops; 1074133741Sjmg sysfilt_ops[~filt].for_refcnt = 0; 1075133741Sjmg } 1076133741Sjmg mtx_unlock(&filterops_lock); 1077133741Sjmg 1078201352Sbrooks return (error); 107988633Salfred} 108088633Salfred 108188633Salfredint 108288633Salfredkqueue_del_filteropts(int filt) 108388633Salfred{ 1084133741Sjmg int error; 108588633Salfred 1086133741Sjmg error = 0; 1087133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1088133741Sjmg return EINVAL; 1089133741Sjmg 1090133741Sjmg mtx_lock(&filterops_lock); 1091133741Sjmg if (sysfilt_ops[~filt].for_fop == &null_filtops || 1092133741Sjmg sysfilt_ops[~filt].for_fop == NULL) 1093133741Sjmg error = EINVAL; 1094133741Sjmg else if (sysfilt_ops[~filt].for_refcnt != 0) 1095133741Sjmg error = EBUSY; 1096133741Sjmg else { 1097133741Sjmg sysfilt_ops[~filt].for_fop = &null_filtops; 1098133741Sjmg sysfilt_ops[~filt].for_refcnt = 0; 1099133741Sjmg } 1100133741Sjmg mtx_unlock(&filterops_lock); 1101133741Sjmg 1102133741Sjmg return error; 110388633Salfred} 110488633Salfred 1105133741Sjmgstatic struct filterops * 1106133741Sjmgkqueue_fo_find(int filt) 1107133741Sjmg{ 1108133741Sjmg 1109133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1110133741Sjmg return NULL; 1111133741Sjmg 1112274560Sjmg if (sysfilt_ops[~filt].for_nolock) 1113274560Sjmg return sysfilt_ops[~filt].for_fop; 1114274560Sjmg 1115133741Sjmg mtx_lock(&filterops_lock); 1116133741Sjmg sysfilt_ops[~filt].for_refcnt++; 1117133741Sjmg if (sysfilt_ops[~filt].for_fop == NULL) 1118133741Sjmg sysfilt_ops[~filt].for_fop = &null_filtops; 1119133741Sjmg mtx_unlock(&filterops_lock); 1120133741Sjmg 1121133741Sjmg return sysfilt_ops[~filt].for_fop; 1122133741Sjmg} 1123133741Sjmg 1124133741Sjmgstatic void 1125133741Sjmgkqueue_fo_release(int filt) 1126133741Sjmg{ 1127133741Sjmg 1128133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1129133741Sjmg return; 1130133741Sjmg 1131274560Sjmg if (sysfilt_ops[~filt].for_nolock) 1132274560Sjmg return; 1133274560Sjmg 1134133741Sjmg mtx_lock(&filterops_lock); 1135133741Sjmg KASSERT(sysfilt_ops[~filt].for_refcnt > 0, 1136133741Sjmg ("filter object refcount not valid on release")); 1137133741Sjmg sysfilt_ops[~filt].for_refcnt--; 1138133741Sjmg mtx_unlock(&filterops_lock); 1139133741Sjmg} 1140133741Sjmg 1141133741Sjmg/* 1142170029Srwatson * A ref to kq (obtained via kqueue_acquire) must be held. waitok will 1143133741Sjmg * influence if memory allocation should wait. Make sure it is 0 if you 1144133741Sjmg * hold any mutexes. 1145133741Sjmg */ 1146162594Sjmgstatic int 1147133741Sjmgkqueue_register(struct kqueue *kq, struct kevent *kev, struct thread *td, int waitok) 114859290Sjlemon{ 114959290Sjlemon struct filterops *fops; 1150133741Sjmg struct file *fp; 1151133741Sjmg struct knote *kn, *tkn; 1152302235Skib struct knlist *knl; 1153255219Spjd cap_rights_t rights; 1154133741Sjmg int error, filt, event; 1155255798Skib int haskqglobal, filedesc_unlock; 115659290Sjlemon 1157295785Smarkj if ((kev->flags & (EV_ENABLE | EV_DISABLE)) == (EV_ENABLE | EV_DISABLE)) 1158295785Smarkj return (EINVAL); 1159295785Smarkj 1160133741Sjmg fp = NULL; 1161133741Sjmg kn = NULL; 1162302235Skib knl = NULL; 1163133741Sjmg error = 0; 1164133741Sjmg haskqglobal = 0; 1165255798Skib filedesc_unlock = 0; 116659290Sjlemon 1167133741Sjmg filt = kev->filter; 1168133741Sjmg fops = kqueue_fo_find(filt); 1169133741Sjmg if (fops == NULL) 1170133741Sjmg return EINVAL; 1171133741Sjmg 1172287362Skib if (kev->flags & EV_ADD) { 1173287362Skib /* 1174287362Skib * Prevent waiting with locks. Non-sleepable 1175287362Skib * allocation failures are handled in the loop, only 1176287362Skib * if the spare knote appears to be actually required. 1177287362Skib */ 1178287362Skib tkn = knote_alloc(waitok); 1179287362Skib } else { 1180274560Sjmg tkn = NULL; 1181287362Skib } 1182133741Sjmg 1183133741Sjmgfindkn: 118459290Sjlemon if (fops->f_isfd) { 1185133741Sjmg KASSERT(td != NULL, ("td is NULL")); 1186303216Skib if (kev->ident > INT_MAX) 1187303216Skib error = EBADF; 1188303216Skib else 1189303216Skib error = fget(td, kev->ident, 1190303216Skib cap_rights_init(&rights, CAP_EVENT), &fp); 1191159553Sjhb if (error) 1192133741Sjmg goto done; 119359290Sjlemon 1194133741Sjmg if ((kev->flags & EV_ADD) == EV_ADD && kqueue_expand(kq, fops, 1195133741Sjmg kev->ident, 0) != 0) { 1196159553Sjhb /* try again */ 1197133741Sjmg fdrop(fp, td); 1198133741Sjmg fp = NULL; 1199133741Sjmg error = kqueue_expand(kq, fops, kev->ident, waitok); 1200133741Sjmg if (error) 1201133741Sjmg goto done; 1202133741Sjmg goto findkn; 1203133741Sjmg } 1204133741Sjmg 1205133741Sjmg if (fp->f_type == DTYPE_KQUEUE) { 1206133741Sjmg /* 1207295012Svangyzen * If we add some intelligence about what we are doing, 1208133741Sjmg * we should be able to support events on ourselves. 1209133741Sjmg * We need to know when we are doing this to prevent 1210133741Sjmg * getting both the knlist lock and the kq lock since 1211133741Sjmg * they are the same thing. 1212133741Sjmg */ 1213133741Sjmg if (fp->f_data == kq) { 1214133741Sjmg error = EINVAL; 1215159172Spjd goto done; 1216133741Sjmg } 1217133741Sjmg 1218255798Skib /* 1219255798Skib * Pre-lock the filedesc before the global 1220255798Skib * lock mutex, see the comment in 1221255798Skib * kqueue_close(). 1222255798Skib */ 1223255798Skib FILEDESC_XLOCK(td->td_proc->p_fd); 1224255798Skib filedesc_unlock = 1; 1225133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1226133741Sjmg } 1227133741Sjmg 1228133741Sjmg KQ_LOCK(kq); 1229133741Sjmg if (kev->ident < kq->kq_knlistsize) { 1230133741Sjmg SLIST_FOREACH(kn, &kq->kq_knlist[kev->ident], kn_link) 1231133741Sjmg if (kev->filter == kn->kn_filter) 123259290Sjlemon break; 123359290Sjlemon } 123459290Sjlemon } else { 1235133741Sjmg if ((kev->flags & EV_ADD) == EV_ADD) 1236133741Sjmg kqueue_expand(kq, fops, kev->ident, waitok); 1237133741Sjmg 1238133741Sjmg KQ_LOCK(kq); 1239295012Svangyzen 1240295012Svangyzen /* 1241295012Svangyzen * If possible, find an existing knote to use for this kevent. 1242295012Svangyzen */ 1243295012Svangyzen if (kev->filter == EVFILT_PROC && 1244295012Svangyzen (kev->flags & (EV_FLAG1 | EV_FLAG2)) != 0) { 1245295012Svangyzen /* This is an internal creation of a process tracking 1246295012Svangyzen * note. Don't attempt to coalesce this with an 1247295012Svangyzen * existing note. 1248295012Svangyzen */ 1249295012Svangyzen ; 1250295012Svangyzen } else if (kq->kq_knhashmask != 0) { 125159290Sjlemon struct klist *list; 1252133635Sjmg 1253133741Sjmg list = &kq->kq_knhash[ 1254133741Sjmg KN_HASH((u_long)kev->ident, kq->kq_knhashmask)]; 125559290Sjlemon SLIST_FOREACH(kn, list, kn_link) 125659290Sjlemon if (kev->ident == kn->kn_id && 125759290Sjlemon kev->filter == kn->kn_filter) 125859290Sjlemon break; 125959290Sjlemon } 126059290Sjlemon } 126159290Sjlemon 1262295012Svangyzen /* knote is in the process of changing, wait for it to stabilize. */ 1263133741Sjmg if (kn != NULL && (kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1264197930Skib KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1265255798Skib if (filedesc_unlock) { 1266255798Skib FILEDESC_XUNLOCK(td->td_proc->p_fd); 1267255798Skib filedesc_unlock = 0; 1268255798Skib } 1269197930Skib kq->kq_state |= KQ_FLUXWAIT; 1270197930Skib msleep(kq, &kq->kq_lock, PSOCK | PDROP, "kqflxwt", 0); 1271133741Sjmg if (fp != NULL) { 1272133741Sjmg fdrop(fp, td); 1273133741Sjmg fp = NULL; 1274133741Sjmg } 1275133741Sjmg goto findkn; 1276133741Sjmg } 1277133741Sjmg 127859290Sjlemon /* 127959290Sjlemon * kn now contains the matching knote, or NULL if no match 128059290Sjlemon */ 1281197240Ssson if (kn == NULL) { 1282197240Ssson if (kev->flags & EV_ADD) { 1283133741Sjmg kn = tkn; 1284133741Sjmg tkn = NULL; 128568883Sdillon if (kn == NULL) { 1286159173Spjd KQ_UNLOCK(kq); 128768883Sdillon error = ENOMEM; 128868883Sdillon goto done; 128968883Sdillon } 129059290Sjlemon kn->kn_fp = fp; 129159290Sjlemon kn->kn_kq = kq; 129259290Sjlemon kn->kn_fop = fops; 129368883Sdillon /* 1294133741Sjmg * apply reference counts to knote structure, and 129568883Sdillon * do not release it at the end of this routine. 129668883Sdillon */ 1297133741Sjmg fops = NULL; 129868883Sdillon fp = NULL; 129968883Sdillon 130061962Sjlemon kn->kn_sfflags = kev->fflags; 130161962Sjlemon kn->kn_sdata = kev->data; 130261962Sjlemon kev->fflags = 0; 130361962Sjlemon kev->data = 0; 130461962Sjlemon kn->kn_kevent = *kev; 1305157383Sjmg kn->kn_kevent.flags &= ~(EV_ADD | EV_DELETE | 1306274560Sjmg EV_ENABLE | EV_DISABLE | EV_FORCEONESHOT); 1307133741Sjmg kn->kn_status = KN_INFLUX|KN_DETACHED; 130861962Sjlemon 1309133741Sjmg error = knote_attach(kn, kq); 1310133741Sjmg KQ_UNLOCK(kq); 1311133741Sjmg if (error != 0) { 1312133741Sjmg tkn = kn; 1313133741Sjmg goto done; 1314133741Sjmg } 1315133741Sjmg 1316133741Sjmg if ((error = kn->kn_fop->f_attach(kn)) != 0) { 131783366Sjulian knote_drop(kn, td); 131859290Sjlemon goto done; 131959290Sjlemon } 1320302235Skib knl = kn_list_lock(kn); 1321197240Ssson goto done_ev_add; 132261962Sjlemon } else { 1323197240Ssson /* No matching knote and the EV_ADD flag is not set. */ 1324133741Sjmg KQ_UNLOCK(kq); 1325197240Ssson error = ENOENT; 1326197240Ssson goto done; 132759290Sjlemon } 1328197240Ssson } 1329197240Ssson 1330197240Ssson if (kev->flags & EV_DELETE) { 1331133741Sjmg kn->kn_status |= KN_INFLUX; 1332133741Sjmg KQ_UNLOCK(kq); 1333134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1334134859Sjmg kn->kn_fop->f_detach(kn); 133583366Sjulian knote_drop(kn, td); 133659290Sjlemon goto done; 133759290Sjlemon } 133859290Sjlemon 1339274560Sjmg if (kev->flags & EV_FORCEONESHOT) { 1340274560Sjmg kn->kn_flags |= EV_ONESHOT; 1341274560Sjmg KNOTE_ACTIVATE(kn, 1); 1342274560Sjmg } 1343274560Sjmg 1344197240Ssson /* 1345197240Ssson * The user may change some filter values after the initial EV_ADD, 1346197240Ssson * but doing so will not reset any filter which has already been 1347197240Ssson * triggered. 1348197240Ssson */ 1349264146Skib kn->kn_status |= KN_INFLUX | KN_SCAN; 1350197240Ssson KQ_UNLOCK(kq); 1351302235Skib knl = kn_list_lock(kn); 1352197240Ssson kn->kn_kevent.udata = kev->udata; 1353197240Ssson if (!fops->f_isfd && fops->f_touch != NULL) { 1354197240Ssson fops->f_touch(kn, kev, EVENT_REGISTER); 1355197240Ssson } else { 1356197240Ssson kn->kn_sfflags = kev->fflags; 1357197240Ssson kn->kn_sdata = kev->data; 1358197240Ssson } 1359197240Ssson 1360197240Ssson /* 1361197240Ssson * We can get here with kn->kn_knlist == NULL. This can happen when 1362197240Ssson * the initial attach event decides that the event is "completed" 1363197240Ssson * already. i.e. filt_procattach is called on a zombie process. It 1364197240Ssson * will call filt_proc which will remove it from the list, and NULL 1365197240Ssson * kn_knlist. 1366197240Ssson */ 1367197240Sssondone_ev_add: 1368295786Smarkj if ((kev->flags & EV_ENABLE) != 0) 1369295786Smarkj kn->kn_status &= ~KN_DISABLED; 1370295786Smarkj else if ((kev->flags & EV_DISABLE) != 0) 1371274560Sjmg kn->kn_status |= KN_DISABLED; 1372274560Sjmg 1373274560Sjmg if ((kn->kn_status & KN_DISABLED) == 0) 1374274560Sjmg event = kn->kn_fop->f_event(kn, 0); 1375274560Sjmg else 1376274560Sjmg event = 0; 1377295786Smarkj 1378197240Ssson KQ_LOCK(kq); 1379197240Ssson if (event) 1380295786Smarkj kn->kn_status |= KN_ACTIVE; 1381295786Smarkj if ((kn->kn_status & (KN_ACTIVE | KN_DISABLED | KN_QUEUED)) == 1382295786Smarkj KN_ACTIVE) 1383295786Smarkj knote_enqueue(kn); 1384264146Skib kn->kn_status &= ~(KN_INFLUX | KN_SCAN); 1385302235Skib kn_list_unlock(knl); 1386133741Sjmg KQ_UNLOCK_FLUX(kq); 138759290Sjlemon 138859290Sjlemondone: 1389133741Sjmg KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1390255798Skib if (filedesc_unlock) 1391255798Skib FILEDESC_XUNLOCK(td->td_proc->p_fd); 139268883Sdillon if (fp != NULL) 139383366Sjulian fdrop(fp, td); 1394287362Skib knote_free(tkn); 1395133741Sjmg if (fops != NULL) 1396133741Sjmg kqueue_fo_release(filt); 139759290Sjlemon return (error); 139859290Sjlemon} 139959290Sjlemon 140059290Sjlemonstatic int 1401170029Srwatsonkqueue_acquire(struct file *fp, struct kqueue **kqp) 140259290Sjlemon{ 1403133741Sjmg int error; 140489306Salfred struct kqueue *kq; 1405133741Sjmg 1406133741Sjmg error = 0; 1407133741Sjmg 1408174988Sjeff kq = fp->f_data; 1409174988Sjeff if (fp->f_type != DTYPE_KQUEUE || kq == NULL) 1410174988Sjeff return (EBADF); 1411174988Sjeff *kqp = kq; 1412174988Sjeff KQ_LOCK(kq); 1413174988Sjeff if ((kq->kq_state & KQ_CLOSING) == KQ_CLOSING) { 1414133741Sjmg KQ_UNLOCK(kq); 1415174988Sjeff return (EBADF); 1416174988Sjeff } 1417174988Sjeff kq->kq_refcnt++; 1418174988Sjeff KQ_UNLOCK(kq); 1419133741Sjmg 1420133741Sjmg return error; 1421133741Sjmg} 1422133741Sjmg 1423133741Sjmgstatic void 1424133741Sjmgkqueue_release(struct kqueue *kq, int locked) 1425133741Sjmg{ 1426133741Sjmg if (locked) 1427133741Sjmg KQ_OWNED(kq); 1428133741Sjmg else 1429133741Sjmg KQ_LOCK(kq); 1430133741Sjmg kq->kq_refcnt--; 1431133741Sjmg if (kq->kq_refcnt == 1) 1432133741Sjmg wakeup(&kq->kq_refcnt); 1433133741Sjmg if (!locked) 1434133741Sjmg KQ_UNLOCK(kq); 1435133741Sjmg} 1436133741Sjmg 1437133741Sjmgstatic void 1438133741Sjmgkqueue_schedtask(struct kqueue *kq) 1439133741Sjmg{ 1440133741Sjmg 1441133741Sjmg KQ_OWNED(kq); 1442133741Sjmg KASSERT(((kq->kq_state & KQ_TASKDRAIN) != KQ_TASKDRAIN), 1443133741Sjmg ("scheduling kqueue task while draining")); 1444133741Sjmg 1445133741Sjmg if ((kq->kq_state & KQ_TASKSCHED) != KQ_TASKSCHED) { 1446300627Skib taskqueue_enqueue(taskqueue_kqueue_ctx, &kq->kq_task); 1447133741Sjmg kq->kq_state |= KQ_TASKSCHED; 1448133741Sjmg } 1449133741Sjmg} 1450133741Sjmg 1451133741Sjmg/* 1452133741Sjmg * Expand the kq to make sure we have storage for fops/ident pair. 1453133741Sjmg * 1454133741Sjmg * Return 0 on success (or no work necessary), return errno on failure. 1455133741Sjmg * 1456133741Sjmg * Not calling hashinit w/ waitok (proper malloc flag) should be safe. 1457133741Sjmg * If kqueue_register is called from a non-fd context, there usually/should 1458133741Sjmg * be no locks held. 1459133741Sjmg */ 1460133741Sjmgstatic int 1461133741Sjmgkqueue_expand(struct kqueue *kq, struct filterops *fops, uintptr_t ident, 1462133741Sjmg int waitok) 1463133741Sjmg{ 1464205886Sjhb struct klist *list, *tmp_knhash, *to_free; 1465133741Sjmg u_long tmp_knhashmask; 1466133741Sjmg int size; 1467133741Sjmg int fd; 1468133741Sjmg int mflag = waitok ? M_WAITOK : M_NOWAIT; 1469133741Sjmg 1470133741Sjmg KQ_NOTOWNED(kq); 1471133741Sjmg 1472205886Sjhb to_free = NULL; 1473133741Sjmg if (fops->f_isfd) { 1474133741Sjmg fd = ident; 1475133741Sjmg if (kq->kq_knlistsize <= fd) { 1476133741Sjmg size = kq->kq_knlistsize; 1477133741Sjmg while (size <= fd) 1478133741Sjmg size += KQEXTENT; 1479197575Sdelphij list = malloc(size * sizeof(*list), M_KQUEUE, mflag); 1480133741Sjmg if (list == NULL) 1481133741Sjmg return ENOMEM; 1482133741Sjmg KQ_LOCK(kq); 1483133741Sjmg if (kq->kq_knlistsize > fd) { 1484205886Sjhb to_free = list; 1485133741Sjmg list = NULL; 1486133741Sjmg } else { 1487133741Sjmg if (kq->kq_knlist != NULL) { 1488133741Sjmg bcopy(kq->kq_knlist, list, 1489197575Sdelphij kq->kq_knlistsize * sizeof(*list)); 1490205886Sjhb to_free = kq->kq_knlist; 1491133741Sjmg kq->kq_knlist = NULL; 1492133741Sjmg } 1493133741Sjmg bzero((caddr_t)list + 1494197575Sdelphij kq->kq_knlistsize * sizeof(*list), 1495197575Sdelphij (size - kq->kq_knlistsize) * sizeof(*list)); 1496133741Sjmg kq->kq_knlistsize = size; 1497133741Sjmg kq->kq_knlist = list; 1498133741Sjmg } 1499133741Sjmg KQ_UNLOCK(kq); 1500133741Sjmg } 1501133741Sjmg } else { 1502133741Sjmg if (kq->kq_knhashmask == 0) { 1503133741Sjmg tmp_knhash = hashinit(KN_HASHSIZE, M_KQUEUE, 1504133741Sjmg &tmp_knhashmask); 1505133741Sjmg if (tmp_knhash == NULL) 1506133741Sjmg return ENOMEM; 1507133741Sjmg KQ_LOCK(kq); 1508133741Sjmg if (kq->kq_knhashmask == 0) { 1509133741Sjmg kq->kq_knhash = tmp_knhash; 1510133741Sjmg kq->kq_knhashmask = tmp_knhashmask; 1511133741Sjmg } else { 1512205886Sjhb to_free = tmp_knhash; 1513133741Sjmg } 1514133741Sjmg KQ_UNLOCK(kq); 1515133741Sjmg } 1516133741Sjmg } 1517205886Sjhb free(to_free, M_KQUEUE); 1518133741Sjmg 1519133741Sjmg KQ_NOTOWNED(kq); 1520133741Sjmg return 0; 1521133741Sjmg} 1522133741Sjmg 1523133741Sjmgstatic void 1524133741Sjmgkqueue_task(void *arg, int pending) 1525133741Sjmg{ 1526133741Sjmg struct kqueue *kq; 1527133741Sjmg int haskqglobal; 1528133741Sjmg 1529133741Sjmg haskqglobal = 0; 1530133741Sjmg kq = arg; 1531133741Sjmg 1532133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1533133741Sjmg KQ_LOCK(kq); 1534133741Sjmg 1535133741Sjmg KNOTE_LOCKED(&kq->kq_sel.si_note, 0); 1536133741Sjmg 1537133741Sjmg kq->kq_state &= ~KQ_TASKSCHED; 1538133741Sjmg if ((kq->kq_state & KQ_TASKDRAIN) == KQ_TASKDRAIN) { 1539133741Sjmg wakeup(&kq->kq_state); 1540133741Sjmg } 1541133741Sjmg KQ_UNLOCK(kq); 1542133741Sjmg KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1543133741Sjmg} 1544133741Sjmg 1545133741Sjmg/* 1546133741Sjmg * Scan, update kn_data (if not ONESHOT), and copyout triggered events. 1547133741Sjmg * We treat KN_MARKER knotes as if they are INFLUX. 1548133741Sjmg */ 1549133741Sjmgstatic int 1550146950Spskqueue_scan(struct kqueue *kq, int maxevents, struct kevent_copyops *k_ops, 1551146950Sps const struct timespec *tsp, struct kevent *keva, struct thread *td) 1552133741Sjmg{ 155359290Sjlemon struct kevent *kevp; 1554133794Sgreen struct knote *kn, *marker; 1555302235Skib struct knlist *knl; 1556247804Sdavide sbintime_t asbt, rsbt; 1557247804Sdavide int count, error, haskqglobal, influx, nkev, touch; 155859290Sjlemon 155959290Sjlemon count = maxevents; 1560133741Sjmg nkev = 0; 1561133741Sjmg error = 0; 1562133741Sjmg haskqglobal = 0; 156359290Sjlemon 1564133741Sjmg if (maxevents == 0) 1565133741Sjmg goto done_nl; 1566133741Sjmg 1567247804Sdavide rsbt = 0; 156864343Sjlemon if (tsp != NULL) { 1569247804Sdavide if (tsp->tv_sec < 0 || tsp->tv_nsec < 0 || 1570247917Smav tsp->tv_nsec >= 1000000000) { 157159290Sjlemon error = EINVAL; 1572133741Sjmg goto done_nl; 157359290Sjlemon } 1574247804Sdavide if (timespecisset(tsp)) { 1575248092Smav if (tsp->tv_sec <= INT32_MAX) { 1576247898Smav rsbt = tstosbt(*tsp); 1577247898Smav if (TIMESEL(&asbt, rsbt)) 1578247898Smav asbt += tc_tick_sbt; 1579264388Sdavide if (asbt <= SBT_MAX - rsbt) 1580248092Smav asbt += rsbt; 1581248092Smav else 1582247898Smav asbt = 0; 1583247898Smav rsbt >>= tc_precexp; 1584247898Smav } else 1585247898Smav asbt = 0; 1586247804Sdavide } else 1587247804Sdavide asbt = -1; 1588247804Sdavide } else 1589247804Sdavide asbt = 0; 1590133794Sgreen marker = knote_alloc(1); 1591133794Sgreen marker->kn_status = KN_MARKER; 1592133741Sjmg KQ_LOCK(kq); 159359290Sjlemon 159459290Sjlemonretry: 1595133741Sjmg kevp = keva; 159659290Sjlemon if (kq->kq_count == 0) { 1597247804Sdavide if (asbt == -1) { 159864343Sjlemon error = EWOULDBLOCK; 159964343Sjlemon } else { 160064343Sjlemon kq->kq_state |= KQ_SLEEP; 1601247804Sdavide error = msleep_sbt(kq, &kq->kq_lock, PSOCK | PCATCH, 1602247804Sdavide "kqread", asbt, rsbt, C_ABSOLUTE); 160364343Sjlemon } 160464084Sjlemon if (error == 0) 160559290Sjlemon goto retry; 160664084Sjlemon /* don't restart after signals... */ 160764084Sjlemon if (error == ERESTART) 160864084Sjlemon error = EINTR; 160964084Sjlemon else if (error == EWOULDBLOCK) 161059290Sjlemon error = 0; 161159290Sjlemon goto done; 161259290Sjlemon } 161359290Sjlemon 1614133794Sgreen TAILQ_INSERT_TAIL(&kq->kq_head, marker, kn_tqe); 1615178914Skib influx = 0; 161659290Sjlemon while (count) { 1617133741Sjmg KQ_OWNED(kq); 161859290Sjlemon kn = TAILQ_FIRST(&kq->kq_head); 1619133741Sjmg 1620133794Sgreen if ((kn->kn_status == KN_MARKER && kn != marker) || 1621133741Sjmg (kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1622178914Skib if (influx) { 1623178914Skib influx = 0; 1624178914Skib KQ_FLUX_WAKEUP(kq); 1625178914Skib } 1626180336Skib kq->kq_state |= KQ_FLUXWAIT; 1627133741Sjmg error = msleep(kq, &kq->kq_lock, PSOCK, 1628133741Sjmg "kqflxwt", 0); 1629133741Sjmg continue; 1630133741Sjmg } 1631133741Sjmg 1632133590Srwatson TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); 1633133741Sjmg if ((kn->kn_status & KN_DISABLED) == KN_DISABLED) { 1634133741Sjmg kn->kn_status &= ~KN_QUEUED; 1635133741Sjmg kq->kq_count--; 1636133741Sjmg continue; 1637133741Sjmg } 1638133794Sgreen if (kn == marker) { 1639133741Sjmg KQ_FLUX_WAKEUP(kq); 164059290Sjlemon if (count == maxevents) 164159290Sjlemon goto retry; 164259290Sjlemon goto done; 164359290Sjlemon } 1644133741Sjmg KASSERT((kn->kn_status & KN_INFLUX) == 0, 1645133741Sjmg ("KN_INFLUX set when not suppose to be")); 1646133741Sjmg 1647254072Sjhb if ((kn->kn_flags & EV_DROP) == EV_DROP) { 164859290Sjlemon kn->kn_status &= ~KN_QUEUED; 1649133741Sjmg kn->kn_status |= KN_INFLUX; 165059290Sjlemon kq->kq_count--; 1651133741Sjmg KQ_UNLOCK(kq); 1652133741Sjmg /* 1653133741Sjmg * We don't need to lock the list since we've marked 1654133741Sjmg * it _INFLUX. 1655133741Sjmg */ 1656254072Sjhb if (!(kn->kn_status & KN_DETACHED)) 1657254072Sjhb kn->kn_fop->f_detach(kn); 1658254072Sjhb knote_drop(kn, td); 1659254072Sjhb KQ_LOCK(kq); 1660254072Sjhb continue; 1661254072Sjhb } else if ((kn->kn_flags & EV_ONESHOT) == EV_ONESHOT) { 1662254072Sjhb kn->kn_status &= ~KN_QUEUED; 1663254072Sjhb kn->kn_status |= KN_INFLUX; 1664254072Sjhb kq->kq_count--; 1665254072Sjhb KQ_UNLOCK(kq); 1666254072Sjhb /* 1667254072Sjhb * We don't need to lock the list since we've marked 1668254072Sjhb * it _INFLUX. 1669254072Sjhb */ 1670133741Sjmg *kevp = kn->kn_kevent; 1671134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1672134859Sjmg kn->kn_fop->f_detach(kn); 167383366Sjulian knote_drop(kn, td); 1674133741Sjmg KQ_LOCK(kq); 1675133741Sjmg kn = NULL; 167659290Sjlemon } else { 1677264146Skib kn->kn_status |= KN_INFLUX | KN_SCAN; 1678133741Sjmg KQ_UNLOCK(kq); 1679133741Sjmg if ((kn->kn_status & KN_KQUEUE) == KN_KQUEUE) 1680133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1681302235Skib knl = kn_list_lock(kn); 1682133741Sjmg if (kn->kn_fop->f_event(kn, 0) == 0) { 1683133741Sjmg KQ_LOCK(kq); 1684157754Sjhb KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1685133741Sjmg kn->kn_status &= 1686264146Skib ~(KN_QUEUED | KN_ACTIVE | KN_INFLUX | 1687264146Skib KN_SCAN); 1688133741Sjmg kq->kq_count--; 1689302235Skib kn_list_unlock(knl); 1690178914Skib influx = 1; 1691133741Sjmg continue; 1692133741Sjmg } 1693197240Ssson touch = (!kn->kn_fop->f_isfd && 1694197240Ssson kn->kn_fop->f_touch != NULL); 1695197240Ssson if (touch) 1696197240Ssson kn->kn_fop->f_touch(kn, kevp, EVENT_PROCESS); 1697197240Ssson else 1698197240Ssson *kevp = kn->kn_kevent; 1699133741Sjmg KQ_LOCK(kq); 1700157754Sjhb KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1701254932Sjmg if (kn->kn_flags & (EV_CLEAR | EV_DISPATCH)) { 1702197240Ssson /* 1703197240Ssson * Manually clear knotes who weren't 1704197240Ssson * 'touch'ed. 1705197240Ssson */ 1706197242Ssson if (touch == 0 && kn->kn_flags & EV_CLEAR) { 1707197240Ssson kn->kn_data = 0; 1708197240Ssson kn->kn_fflags = 0; 1709197240Ssson } 1710197242Ssson if (kn->kn_flags & EV_DISPATCH) 1711197242Ssson kn->kn_status |= KN_DISABLED; 1712133741Sjmg kn->kn_status &= ~(KN_QUEUED | KN_ACTIVE); 1713133741Sjmg kq->kq_count--; 1714133741Sjmg } else 1715133741Sjmg TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); 1716150199Sups 1717264146Skib kn->kn_status &= ~(KN_INFLUX | KN_SCAN); 1718302235Skib kn_list_unlock(knl); 1719178914Skib influx = 1; 172059290Sjlemon } 1721133741Sjmg 1722133741Sjmg /* we are returning a copy to the user */ 1723133741Sjmg kevp++; 1724133741Sjmg nkev++; 172559290Sjlemon count--; 1726133741Sjmg 172759290Sjlemon if (nkev == KQ_NEVENTS) { 1728178914Skib influx = 0; 1729133741Sjmg KQ_UNLOCK_FLUX(kq); 1730146950Sps error = k_ops->k_copyout(k_ops->arg, keva, nkev); 173159290Sjlemon nkev = 0; 1732133741Sjmg kevp = keva; 1733133741Sjmg KQ_LOCK(kq); 173459997Sjlemon if (error) 173559997Sjlemon break; 173659290Sjlemon } 173759290Sjlemon } 1738133794Sgreen TAILQ_REMOVE(&kq->kq_head, marker, kn_tqe); 173959290Sjlemondone: 1740133741Sjmg KQ_OWNED(kq); 1741133741Sjmg KQ_UNLOCK_FLUX(kq); 1742133794Sgreen knote_free(marker); 1743133741Sjmgdone_nl: 1744133741Sjmg KQ_NOTOWNED(kq); 174559290Sjlemon if (nkev != 0) 1746146950Sps error = k_ops->k_copyout(k_ops->arg, keva, nkev); 1747133741Sjmg td->td_retval[0] = maxevents - count; 174859290Sjlemon return (error); 174959290Sjlemon} 175059290Sjlemon 175159290Sjlemon/*ARGSUSED*/ 1752255675Srdivackystatic int 1753132138Salfredkqueue_ioctl(struct file *fp, u_long cmd, void *data, 1754102003Srwatson struct ucred *active_cred, struct thread *td) 175559290Sjlemon{ 1756132174Salfred /* 1757132174Salfred * Enabling sigio causes two major problems: 1758132174Salfred * 1) infinite recursion: 1759132174Salfred * Synopsys: kevent is being used to track signals and have FIOASYNC 1760132174Salfred * set. On receipt of a signal this will cause a kqueue to recurse 1761132174Salfred * into itself over and over. Sending the sigio causes the kqueue 1762132174Salfred * to become ready, which in turn posts sigio again, forever. 1763132174Salfred * Solution: this can be solved by setting a flag in the kqueue that 1764132174Salfred * we have a SIGIO in progress. 1765132174Salfred * 2) locking problems: 1766132174Salfred * Synopsys: Kqueue is a leaf subsystem, but adding signalling puts 1767132174Salfred * us above the proc and pgrp locks. 1768132174Salfred * Solution: Post a signal using an async mechanism, being sure to 1769132174Salfred * record a generation count in the delivery so that we do not deliver 1770132174Salfred * a signal to the wrong process. 1771132174Salfred * 1772132174Salfred * Note, these two mechanisms are somewhat mutually exclusive! 1773132174Salfred */ 1774132174Salfred#if 0 1775132138Salfred struct kqueue *kq; 1776132138Salfred 1777132138Salfred kq = fp->f_data; 1778132138Salfred switch (cmd) { 1779132138Salfred case FIOASYNC: 1780132138Salfred if (*(int *)data) { 1781132138Salfred kq->kq_state |= KQ_ASYNC; 1782132138Salfred } else { 1783132138Salfred kq->kq_state &= ~KQ_ASYNC; 1784132138Salfred } 1785132138Salfred return (0); 1786132138Salfred 1787132138Salfred case FIOSETOWN: 1788132138Salfred return (fsetown(*(int *)data, &kq->kq_sigio)); 1789132138Salfred 1790132138Salfred case FIOGETOWN: 1791132138Salfred *(int *)data = fgetown(&kq->kq_sigio); 1792132138Salfred return (0); 1793132138Salfred } 1794132174Salfred#endif 1795132138Salfred 179659290Sjlemon return (ENOTTY); 179759290Sjlemon} 179859290Sjlemon 179959290Sjlemon/*ARGSUSED*/ 1800255675Srdivackystatic int 1801101983Srwatsonkqueue_poll(struct file *fp, int events, struct ucred *active_cred, 1802101987Srwatson struct thread *td) 180359290Sjlemon{ 180489306Salfred struct kqueue *kq; 180559290Sjlemon int revents = 0; 1806133741Sjmg int error; 180759290Sjlemon 1808170029Srwatson if ((error = kqueue_acquire(fp, &kq))) 1809133741Sjmg return POLLERR; 1810133741Sjmg 1811133741Sjmg KQ_LOCK(kq); 1812133741Sjmg if (events & (POLLIN | POLLRDNORM)) { 1813133741Sjmg if (kq->kq_count) { 1814133741Sjmg revents |= events & (POLLIN | POLLRDNORM); 181559290Sjlemon } else { 1816133741Sjmg selrecord(td, &kq->kq_sel); 1817174647Sjeff if (SEL_WAITING(&kq->kq_sel)) 1818174647Sjeff kq->kq_state |= KQ_SEL; 181959290Sjlemon } 182059290Sjlemon } 1821133741Sjmg kqueue_release(kq, 1); 1822133741Sjmg KQ_UNLOCK(kq); 182359290Sjlemon return (revents); 182459290Sjlemon} 182559290Sjlemon 182659290Sjlemon/*ARGSUSED*/ 1827255675Srdivackystatic int 1828101983Srwatsonkqueue_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 1829101987Srwatson struct thread *td) 183059290Sjlemon{ 183159290Sjlemon 1832146603Sjmg bzero((void *)st, sizeof *st); 1833146603Sjmg /* 1834146603Sjmg * We no longer return kq_count because the unlocked value is useless. 1835146603Sjmg * If you spent all this time getting the count, why not spend your 1836146603Sjmg * syscall better by calling kevent? 1837146603Sjmg * 1838146603Sjmg * XXX - This is needed for libc_r. 1839146603Sjmg */ 1840146603Sjmg st->st_mode = S_IFIFO; 1841146603Sjmg return (0); 184259290Sjlemon} 184359290Sjlemon 1844286631Sedstatic void 1845286631Sedkqueue_drain(struct kqueue *kq, struct thread *td) 184659290Sjlemon{ 1847133741Sjmg struct knote *kn; 184859290Sjlemon int i; 184959290Sjlemon 1850133741Sjmg KQ_LOCK(kq); 1851133741Sjmg 1852133741Sjmg KASSERT((kq->kq_state & KQ_CLOSING) != KQ_CLOSING, 1853133741Sjmg ("kqueue already closing")); 1854133741Sjmg kq->kq_state |= KQ_CLOSING; 1855133741Sjmg if (kq->kq_refcnt > 1) 1856133741Sjmg msleep(&kq->kq_refcnt, &kq->kq_lock, PSOCK, "kqclose", 0); 1857133741Sjmg 1858133741Sjmg KASSERT(kq->kq_refcnt == 1, ("other refs are out there!")); 1859133741Sjmg 1860133741Sjmg KASSERT(knlist_empty(&kq->kq_sel.si_note), 1861133741Sjmg ("kqueue's knlist not empty")); 1862133741Sjmg 1863133741Sjmg for (i = 0; i < kq->kq_knlistsize; i++) { 1864133741Sjmg while ((kn = SLIST_FIRST(&kq->kq_knlist[i])) != NULL) { 1865178913Skib if ((kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1866178913Skib kq->kq_state |= KQ_FLUXWAIT; 1867178913Skib msleep(kq, &kq->kq_lock, PSOCK, "kqclo1", 0); 1868178913Skib continue; 1869178913Skib } 1870133741Sjmg kn->kn_status |= KN_INFLUX; 1871133741Sjmg KQ_UNLOCK(kq); 1872134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1873134859Sjmg kn->kn_fop->f_detach(kn); 1874133741Sjmg knote_drop(kn, td); 1875133741Sjmg KQ_LOCK(kq); 187659290Sjlemon } 187759290Sjlemon } 1878133741Sjmg if (kq->kq_knhashmask != 0) { 1879133741Sjmg for (i = 0; i <= kq->kq_knhashmask; i++) { 1880133741Sjmg while ((kn = SLIST_FIRST(&kq->kq_knhash[i])) != NULL) { 1881178913Skib if ((kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1882178913Skib kq->kq_state |= KQ_FLUXWAIT; 1883178913Skib msleep(kq, &kq->kq_lock, PSOCK, 1884178913Skib "kqclo2", 0); 1885178913Skib continue; 1886178913Skib } 1887133741Sjmg kn->kn_status |= KN_INFLUX; 1888133741Sjmg KQ_UNLOCK(kq); 1889134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1890134859Sjmg kn->kn_fop->f_detach(kn); 1891133741Sjmg knote_drop(kn, td); 1892133741Sjmg KQ_LOCK(kq); 189359290Sjlemon } 189459290Sjlemon } 189559290Sjlemon } 1896133741Sjmg 1897133741Sjmg if ((kq->kq_state & KQ_TASKSCHED) == KQ_TASKSCHED) { 1898133741Sjmg kq->kq_state |= KQ_TASKDRAIN; 1899133741Sjmg msleep(&kq->kq_state, &kq->kq_lock, PSOCK, "kqtqdr", 0); 1900133741Sjmg } 1901133741Sjmg 1902133741Sjmg if ((kq->kq_state & KQ_SEL) == KQ_SEL) { 1903126033Sgreen selwakeuppri(&kq->kq_sel, PSOCK); 1904174647Sjeff if (!SEL_WAITING(&kq->kq_sel)) 1905174647Sjeff kq->kq_state &= ~KQ_SEL; 1906126033Sgreen } 1907133741Sjmg 1908133741Sjmg KQ_UNLOCK(kq); 1909286631Sed} 1910133741Sjmg 1911286631Sedstatic void 1912286631Sedkqueue_destroy(struct kqueue *kq) 1913286631Sed{ 1914286631Sed 1915286681Sed KASSERT(kq->kq_fdp == NULL, 1916286681Sed ("kqueue still attached to a file descriptor")); 1917286631Sed seldrain(&kq->kq_sel); 1918286631Sed knlist_destroy(&kq->kq_sel.si_note); 1919286631Sed mtx_destroy(&kq->kq_lock); 1920286631Sed 1921286631Sed if (kq->kq_knhash != NULL) 1922286631Sed free(kq->kq_knhash, M_KQUEUE); 1923286631Sed if (kq->kq_knlist != NULL) 1924286631Sed free(kq->kq_knlist, M_KQUEUE); 1925286631Sed 1926286631Sed funsetown(&kq->kq_sigio); 1927286631Sed} 1928286631Sed 1929286631Sed/*ARGSUSED*/ 1930286631Sedstatic int 1931286631Sedkqueue_close(struct file *fp, struct thread *td) 1932286631Sed{ 1933286631Sed struct kqueue *kq = fp->f_data; 1934286631Sed struct filedesc *fdp; 1935286631Sed int error; 1936286631Sed int filedesc_unlock; 1937286631Sed 1938286631Sed if ((error = kqueue_acquire(fp, &kq))) 1939286631Sed return error; 1940286631Sed kqueue_drain(kq, td); 1941286631Sed 1942255798Skib /* 1943255798Skib * We could be called due to the knote_drop() doing fdrop(), 1944255798Skib * called from kqueue_register(). In this case the global 1945255798Skib * lock is owned, and filedesc sx is locked before, to not 1946255798Skib * take the sleepable lock after non-sleepable. 1947255798Skib */ 1948286631Sed fdp = kq->kq_fdp; 1949286681Sed kq->kq_fdp = NULL; 1950255798Skib if (!sx_xlocked(FILEDESC_LOCK(fdp))) { 1951255798Skib FILEDESC_XLOCK(fdp); 1952255798Skib filedesc_unlock = 1; 1953255798Skib } else 1954255798Skib filedesc_unlock = 0; 1955255527Skib TAILQ_REMOVE(&fdp->fd_kqlist, kq, kq_list); 1956255798Skib if (filedesc_unlock) 1957255798Skib FILEDESC_XUNLOCK(fdp); 1958133741Sjmg 1959286631Sed kqueue_destroy(kq); 1960256849Skib chgkqcnt(kq->kq_cred->cr_ruidinfo, -1, 0); 1961256849Skib crfree(kq->kq_cred); 196284138Sjlemon free(kq, M_KQUEUE); 1963109153Sdillon fp->f_data = NULL; 196459290Sjlemon 196559290Sjlemon return (0); 196659290Sjlemon} 196759290Sjlemon 1968271976Sjhbstatic int 1969271976Sjhbkqueue_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 1970271976Sjhb{ 1971271976Sjhb 1972271976Sjhb kif->kf_type = KF_TYPE_KQUEUE; 1973271976Sjhb return (0); 1974271976Sjhb} 1975271976Sjhb 197659290Sjlemonstatic void 197759290Sjlemonkqueue_wakeup(struct kqueue *kq) 197859290Sjlemon{ 1979133741Sjmg KQ_OWNED(kq); 198059290Sjlemon 1981133741Sjmg if ((kq->kq_state & KQ_SLEEP) == KQ_SLEEP) { 198259290Sjlemon kq->kq_state &= ~KQ_SLEEP; 198359290Sjlemon wakeup(kq); 198459290Sjlemon } 1985133741Sjmg if ((kq->kq_state & KQ_SEL) == KQ_SEL) { 1986122352Stanimura selwakeuppri(&kq->kq_sel, PSOCK); 1987174647Sjeff if (!SEL_WAITING(&kq->kq_sel)) 1988174647Sjeff kq->kq_state &= ~KQ_SEL; 198959290Sjlemon } 1990133741Sjmg if (!knlist_empty(&kq->kq_sel.si_note)) 1991133741Sjmg kqueue_schedtask(kq); 1992133741Sjmg if ((kq->kq_state & KQ_ASYNC) == KQ_ASYNC) { 1993132138Salfred pgsigio(&kq->kq_sigio, SIGIO, 0); 1994132138Salfred } 199559290Sjlemon} 199659290Sjlemon 199759290Sjlemon/* 1998133741Sjmg * Walk down a list of knotes, activating them if their event has triggered. 1999133741Sjmg * 2000133741Sjmg * There is a possibility to optimize in the case of one kq watching another. 2001133741Sjmg * Instead of scheduling a task to wake it up, you could pass enough state 2002133741Sjmg * down the chain to make up the parent kqueue. Make this code functional 2003133741Sjmg * first. 200459290Sjlemon */ 200559290Sjlemonvoid 2006195148Sstasknote(struct knlist *list, long hint, int lockflags) 200759290Sjlemon{ 2008133741Sjmg struct kqueue *kq; 2009287366Skib struct knote *kn, *tkn; 2010195148Sstas int error; 201159290Sjlemon 2012133741Sjmg if (list == NULL) 2013133741Sjmg return; 2014133741Sjmg 2015195148Sstas KNL_ASSERT_LOCK(list, lockflags & KNF_LISTLOCKED); 2016147730Sssouhlal 2017195148Sstas if ((lockflags & KNF_LISTLOCKED) == 0) 2018147730Sssouhlal list->kl_lock(list->kl_lockarg); 2019147730Sssouhlal 2020133741Sjmg /* 2021287366Skib * If we unlock the list lock (and set KN_INFLUX), we can 2022287366Skib * eliminate the kqueue scheduling, but this will introduce 2023287366Skib * four lock/unlock's for each knote to test. Also, marker 2024287366Skib * would be needed to keep iteration position, since filters 2025287366Skib * or other threads could remove events. 2026133741Sjmg */ 2027287366Skib SLIST_FOREACH_SAFE(kn, &list->kl_list, kn_selnext, tkn) { 2028133741Sjmg kq = kn->kn_kq; 2029264146Skib KQ_LOCK(kq); 2030264146Skib if ((kn->kn_status & (KN_INFLUX | KN_SCAN)) == KN_INFLUX) { 2031264146Skib /* 2032264146Skib * Do not process the influx notes, except for 2033264146Skib * the influx coming from the kq unlock in the 2034264146Skib * kqueue_scan(). In the later case, we do 2035264146Skib * not interfere with the scan, since the code 2036264146Skib * fragment in kqueue_scan() locks the knlist, 2037264146Skib * and cannot proceed until we finished. 2038264146Skib */ 2039264146Skib KQ_UNLOCK(kq); 2040264146Skib } else if ((lockflags & KNF_NOKQLOCK) != 0) { 2041264146Skib kn->kn_status |= KN_INFLUX; 2042264146Skib KQ_UNLOCK(kq); 2043264146Skib error = kn->kn_fop->f_event(kn, hint); 2044133741Sjmg KQ_LOCK(kq); 2045264146Skib kn->kn_status &= ~KN_INFLUX; 2046264146Skib if (error) 2047264146Skib KNOTE_ACTIVATE(kn, 1); 2048264146Skib KQ_UNLOCK_FLUX(kq); 2049264146Skib } else { 2050264146Skib kn->kn_status |= KN_HASKQLOCK; 2051264146Skib if (kn->kn_fop->f_event(kn, hint)) 2052264146Skib KNOTE_ACTIVATE(kn, 1); 2053264146Skib kn->kn_status &= ~KN_HASKQLOCK; 2054264146Skib KQ_UNLOCK(kq); 2055133741Sjmg } 2056133741Sjmg } 2057195148Sstas if ((lockflags & KNF_LISTLOCKED) == 0) 2058147730Sssouhlal list->kl_unlock(list->kl_lockarg); 205959290Sjlemon} 206059290Sjlemon 206159290Sjlemon/* 2062133741Sjmg * add a knote to a knlist 2063133741Sjmg */ 2064133741Sjmgvoid 2065133741Sjmgknlist_add(struct knlist *knl, struct knote *kn, int islocked) 2066133741Sjmg{ 2067147730Sssouhlal KNL_ASSERT_LOCK(knl, islocked); 2068133741Sjmg KQ_NOTOWNED(kn->kn_kq); 2069133741Sjmg KASSERT((kn->kn_status & (KN_INFLUX|KN_DETACHED)) == 2070133741Sjmg (KN_INFLUX|KN_DETACHED), ("knote not KN_INFLUX and KN_DETACHED")); 2071133741Sjmg if (!islocked) 2072147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 2073133741Sjmg SLIST_INSERT_HEAD(&knl->kl_list, kn, kn_selnext); 2074133741Sjmg if (!islocked) 2075147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2076133741Sjmg KQ_LOCK(kn->kn_kq); 2077133741Sjmg kn->kn_knlist = knl; 2078133741Sjmg kn->kn_status &= ~KN_DETACHED; 2079133741Sjmg KQ_UNLOCK(kn->kn_kq); 2080133741Sjmg} 2081133741Sjmg 2082133741Sjmgstatic void 2083302235Skibknlist_remove_kq(struct knlist *knl, struct knote *kn, int knlislocked, 2084302235Skib int kqislocked) 2085133741Sjmg{ 2086133741Sjmg KASSERT(!(!!kqislocked && !knlislocked), ("kq locked w/o knl locked")); 2087147730Sssouhlal KNL_ASSERT_LOCK(knl, knlislocked); 2088133741Sjmg mtx_assert(&kn->kn_kq->kq_lock, kqislocked ? MA_OWNED : MA_NOTOWNED); 2089133741Sjmg if (!kqislocked) 2090133741Sjmg KASSERT((kn->kn_status & (KN_INFLUX|KN_DETACHED)) == KN_INFLUX, 2091133741Sjmg ("knlist_remove called w/o knote being KN_INFLUX or already removed")); 2092133741Sjmg if (!knlislocked) 2093147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 2094133741Sjmg SLIST_REMOVE(&knl->kl_list, kn, knote, kn_selnext); 2095133741Sjmg kn->kn_knlist = NULL; 2096133741Sjmg if (!knlislocked) 2097302235Skib kn_list_unlock(knl); 2098133741Sjmg if (!kqislocked) 2099133741Sjmg KQ_LOCK(kn->kn_kq); 2100133741Sjmg kn->kn_status |= KN_DETACHED; 2101133741Sjmg if (!kqislocked) 2102133741Sjmg KQ_UNLOCK(kn->kn_kq); 2103133741Sjmg} 2104133741Sjmg 2105133741Sjmg/* 2106254932Sjmg * remove knote from the specified knlist 210759290Sjlemon */ 210859290Sjlemonvoid 2109133741Sjmgknlist_remove(struct knlist *knl, struct knote *kn, int islocked) 211059290Sjlemon{ 2111133741Sjmg 2112133741Sjmg knlist_remove_kq(knl, kn, islocked, 0); 2113133741Sjmg} 2114133741Sjmg 2115133741Sjmgint 2116133741Sjmgknlist_empty(struct knlist *knl) 2117133741Sjmg{ 2118233505Smelifaro 2119147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2120133741Sjmg return SLIST_EMPTY(&knl->kl_list); 2121133741Sjmg} 2122133741Sjmg 2123133741Sjmgstatic struct mtx knlist_lock; 2124133741SjmgMTX_SYSINIT(knlist_lock, &knlist_lock, "knlist lock for lockless objects", 2125133741Sjmg MTX_DEF); 2126147730Sssouhlalstatic void knlist_mtx_lock(void *arg); 2127147730Sssouhlalstatic void knlist_mtx_unlock(void *arg); 2128133741Sjmg 2129147730Sssouhlalstatic void 2130147730Sssouhlalknlist_mtx_lock(void *arg) 2131147730Sssouhlal{ 2132233505Smelifaro 2133147730Sssouhlal mtx_lock((struct mtx *)arg); 2134147730Sssouhlal} 2135147730Sssouhlal 2136147730Sssouhlalstatic void 2137147730Sssouhlalknlist_mtx_unlock(void *arg) 2138147730Sssouhlal{ 2139233505Smelifaro 2140147730Sssouhlal mtx_unlock((struct mtx *)arg); 2141147730Sssouhlal} 2142147730Sssouhlal 2143193951Skibstatic void 2144193951Skibknlist_mtx_assert_locked(void *arg) 2145147730Sssouhlal{ 2146233505Smelifaro 2147193951Skib mtx_assert((struct mtx *)arg, MA_OWNED); 2148147730Sssouhlal} 2149147730Sssouhlal 2150193951Skibstatic void 2151193951Skibknlist_mtx_assert_unlocked(void *arg) 2152193951Skib{ 2153233505Smelifaro 2154193951Skib mtx_assert((struct mtx *)arg, MA_NOTOWNED); 2155193951Skib} 2156193951Skib 2157233505Smelifarostatic void 2158233505Smelifaroknlist_rw_rlock(void *arg) 2159233505Smelifaro{ 2160233505Smelifaro 2161233505Smelifaro rw_rlock((struct rwlock *)arg); 2162233505Smelifaro} 2163233505Smelifaro 2164233505Smelifarostatic void 2165233505Smelifaroknlist_rw_runlock(void *arg) 2166233505Smelifaro{ 2167233505Smelifaro 2168233505Smelifaro rw_runlock((struct rwlock *)arg); 2169233505Smelifaro} 2170233505Smelifaro 2171233505Smelifarostatic void 2172233505Smelifaroknlist_rw_assert_locked(void *arg) 2173233505Smelifaro{ 2174233505Smelifaro 2175233505Smelifaro rw_assert((struct rwlock *)arg, RA_LOCKED); 2176233505Smelifaro} 2177233505Smelifaro 2178233505Smelifarostatic void 2179233505Smelifaroknlist_rw_assert_unlocked(void *arg) 2180233505Smelifaro{ 2181233505Smelifaro 2182233505Smelifaro rw_assert((struct rwlock *)arg, RA_UNLOCKED); 2183233505Smelifaro} 2184233505Smelifaro 2185133741Sjmgvoid 2186147730Sssouhlalknlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *), 2187193951Skib void (*kl_unlock)(void *), 2188193951Skib void (*kl_assert_locked)(void *), void (*kl_assert_unlocked)(void *)) 2189133741Sjmg{ 2190133741Sjmg 2191147730Sssouhlal if (lock == NULL) 2192147730Sssouhlal knl->kl_lockarg = &knlist_lock; 2193133741Sjmg else 2194147730Sssouhlal knl->kl_lockarg = lock; 2195133741Sjmg 2196147730Sssouhlal if (kl_lock == NULL) 2197147730Sssouhlal knl->kl_lock = knlist_mtx_lock; 2198147730Sssouhlal else 2199147730Sssouhlal knl->kl_lock = kl_lock; 2200157582Sjmg if (kl_unlock == NULL) 2201147730Sssouhlal knl->kl_unlock = knlist_mtx_unlock; 2202147730Sssouhlal else 2203147730Sssouhlal knl->kl_unlock = kl_unlock; 2204193951Skib if (kl_assert_locked == NULL) 2205193951Skib knl->kl_assert_locked = knlist_mtx_assert_locked; 2206147730Sssouhlal else 2207193951Skib knl->kl_assert_locked = kl_assert_locked; 2208193951Skib if (kl_assert_unlocked == NULL) 2209193951Skib knl->kl_assert_unlocked = knlist_mtx_assert_unlocked; 2210193951Skib else 2211193951Skib knl->kl_assert_unlocked = kl_assert_unlocked; 2212147730Sssouhlal 2213302242Skib knl->kl_autodestroy = 0; 2214133741Sjmg SLIST_INIT(&knl->kl_list); 2215133741Sjmg} 2216133741Sjmg 2217133741Sjmgvoid 2218193951Skibknlist_init_mtx(struct knlist *knl, struct mtx *lock) 2219193951Skib{ 2220193951Skib 2221193951Skib knlist_init(knl, lock, NULL, NULL, NULL, NULL); 2222193951Skib} 2223193951Skib 2224302235Skibstruct knlist * 2225302235Skibknlist_alloc(struct mtx *lock) 2226302235Skib{ 2227302235Skib struct knlist *knl; 2228302235Skib 2229302235Skib knl = malloc(sizeof(struct knlist), M_KQUEUE, M_WAITOK); 2230302235Skib knlist_init_mtx(knl, lock); 2231302235Skib return (knl); 2232302235Skib} 2233302235Skib 2234193951Skibvoid 2235233505Smelifaroknlist_init_rw_reader(struct knlist *knl, struct rwlock *lock) 2236233505Smelifaro{ 2237233505Smelifaro 2238233505Smelifaro knlist_init(knl, lock, knlist_rw_rlock, knlist_rw_runlock, 2239233505Smelifaro knlist_rw_assert_locked, knlist_rw_assert_unlocked); 2240233505Smelifaro} 2241233505Smelifaro 2242233505Smelifarovoid 2243133741Sjmgknlist_destroy(struct knlist *knl) 2244133741Sjmg{ 2245133741Sjmg 2246133741Sjmg#ifdef INVARIANTS 2247133741Sjmg /* 2248133741Sjmg * if we run across this error, we need to find the offending 2249254932Sjmg * driver and have it call knlist_clear or knlist_delete. 2250133741Sjmg */ 2251133741Sjmg if (!SLIST_EMPTY(&knl->kl_list)) 2252133741Sjmg printf("WARNING: destroying knlist w/ knotes on it!\n"); 2253133741Sjmg#endif 2254133741Sjmg 2255147730Sssouhlal knl->kl_lockarg = knl->kl_lock = knl->kl_unlock = NULL; 2256133741Sjmg SLIST_INIT(&knl->kl_list); 2257133741Sjmg} 2258133741Sjmg 2259302235Skibvoid 2260302235Skibknlist_detach(struct knlist *knl) 2261302235Skib{ 2262302235Skib 2263302235Skib KNL_ASSERT_LOCKED(knl); 2264302242Skib knl->kl_autodestroy = 1; 2265302235Skib if (knlist_empty(knl)) { 2266302235Skib knlist_destroy(knl); 2267302235Skib free(knl, M_KQUEUE); 2268302235Skib } 2269302235Skib} 2270302235Skib 2271133741Sjmg/* 2272133741Sjmg * Even if we are locked, we may need to drop the lock to allow any influx 2273133741Sjmg * knotes time to "settle". 2274133741Sjmg */ 2275133741Sjmgvoid 2276143776Sjmgknlist_cleardel(struct knlist *knl, struct thread *td, int islocked, int killkn) 2277133741Sjmg{ 2278159171Spjd struct knote *kn, *kn2; 2279133741Sjmg struct kqueue *kq; 228059290Sjlemon 2281302235Skib KASSERT(!knl->kl_autodestroy, ("cleardel for autodestroy %p", knl)); 2282133741Sjmg if (islocked) 2283147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2284133741Sjmg else { 2285147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); 2286170029Srwatsonagain: /* need to reacquire lock since we have dropped it */ 2287147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 228859290Sjlemon } 2289133741Sjmg 2290159171Spjd SLIST_FOREACH_SAFE(kn, &knl->kl_list, kn_selnext, kn2) { 2291133741Sjmg kq = kn->kn_kq; 2292133741Sjmg KQ_LOCK(kq); 2293143776Sjmg if ((kn->kn_status & KN_INFLUX)) { 2294133741Sjmg KQ_UNLOCK(kq); 2295133741Sjmg continue; 2296133741Sjmg } 2297133741Sjmg knlist_remove_kq(knl, kn, 1, 1); 2298143776Sjmg if (killkn) { 2299143776Sjmg kn->kn_status |= KN_INFLUX | KN_DETACHED; 2300143776Sjmg KQ_UNLOCK(kq); 2301143776Sjmg knote_drop(kn, td); 2302143776Sjmg } else { 2303143776Sjmg /* Make sure cleared knotes disappear soon */ 2304143776Sjmg kn->kn_flags |= (EV_EOF | EV_ONESHOT); 2305143776Sjmg KQ_UNLOCK(kq); 2306143776Sjmg } 2307133741Sjmg kq = NULL; 2308133741Sjmg } 2309133741Sjmg 2310133741Sjmg if (!SLIST_EMPTY(&knl->kl_list)) { 2311133741Sjmg /* there are still KN_INFLUX remaining */ 2312133741Sjmg kn = SLIST_FIRST(&knl->kl_list); 2313133741Sjmg kq = kn->kn_kq; 2314133741Sjmg KQ_LOCK(kq); 2315133741Sjmg KASSERT(kn->kn_status & KN_INFLUX, 2316133741Sjmg ("knote removed w/o list lock")); 2317147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2318133741Sjmg kq->kq_state |= KQ_FLUXWAIT; 2319133741Sjmg msleep(kq, &kq->kq_lock, PSOCK | PDROP, "kqkclr", 0); 2320133741Sjmg kq = NULL; 2321133741Sjmg goto again; 2322133741Sjmg } 2323133741Sjmg 2324133741Sjmg if (islocked) 2325147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2326133741Sjmg else { 2327147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2328147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); 2329133741Sjmg } 233059290Sjlemon} 233159290Sjlemon 233259290Sjlemon/* 2333168355Srwatson * Remove all knotes referencing a specified fd must be called with FILEDESC 2334168355Srwatson * lock. This prevents a race where a new fd comes along and occupies the 2335168355Srwatson * entry and we attach a knote to the fd. 233659290Sjlemon */ 233759290Sjlemonvoid 233883366Sjulianknote_fdclose(struct thread *td, int fd) 233959290Sjlemon{ 234083366Sjulian struct filedesc *fdp = td->td_proc->p_fd; 2341133741Sjmg struct kqueue *kq; 2342133741Sjmg struct knote *kn; 2343133741Sjmg int influx; 234459290Sjlemon 2345168355Srwatson FILEDESC_XLOCK_ASSERT(fdp); 2346133741Sjmg 2347133741Sjmg /* 2348133741Sjmg * We shouldn't have to worry about new kevents appearing on fd 2349133741Sjmg * since filedesc is locked. 2350133741Sjmg */ 2351255527Skib TAILQ_FOREACH(kq, &fdp->fd_kqlist, kq_list) { 2352133741Sjmg KQ_LOCK(kq); 2353133741Sjmg 2354133741Sjmgagain: 2355133741Sjmg influx = 0; 2356133741Sjmg while (kq->kq_knlistsize > fd && 2357133741Sjmg (kn = SLIST_FIRST(&kq->kq_knlist[fd])) != NULL) { 2358133741Sjmg if (kn->kn_status & KN_INFLUX) { 2359133741Sjmg /* someone else might be waiting on our knote */ 2360133741Sjmg if (influx) 2361133741Sjmg wakeup(kq); 2362133741Sjmg kq->kq_state |= KQ_FLUXWAIT; 2363133741Sjmg msleep(kq, &kq->kq_lock, PSOCK, "kqflxwt", 0); 2364133741Sjmg goto again; 2365133741Sjmg } 2366133741Sjmg kn->kn_status |= KN_INFLUX; 2367133741Sjmg KQ_UNLOCK(kq); 2368134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 2369134859Sjmg kn->kn_fop->f_detach(kn); 2370133741Sjmg knote_drop(kn, td); 2371133741Sjmg influx = 1; 2372133741Sjmg KQ_LOCK(kq); 2373133741Sjmg } 2374133741Sjmg KQ_UNLOCK_FLUX(kq); 2375133741Sjmg } 237659290Sjlemon} 237759290Sjlemon 2378133741Sjmgstatic int 2379133741Sjmgknote_attach(struct knote *kn, struct kqueue *kq) 238059290Sjlemon{ 2381133741Sjmg struct klist *list; 238259290Sjlemon 2383133741Sjmg KASSERT(kn->kn_status & KN_INFLUX, ("knote not marked INFLUX")); 2384133741Sjmg KQ_OWNED(kq); 238589306Salfred 2386133741Sjmg if (kn->kn_fop->f_isfd) { 2387133741Sjmg if (kn->kn_id >= kq->kq_knlistsize) 2388133741Sjmg return ENOMEM; 2389133741Sjmg list = &kq->kq_knlist[kn->kn_id]; 2390133741Sjmg } else { 2391133741Sjmg if (kq->kq_knhash == NULL) 2392133741Sjmg return ENOMEM; 2393133741Sjmg list = &kq->kq_knhash[KN_HASH(kn->kn_id, kq->kq_knhashmask)]; 239459290Sjlemon } 239559290Sjlemon 239659290Sjlemon SLIST_INSERT_HEAD(list, kn, kn_link); 2397133741Sjmg 2398133741Sjmg return 0; 239959290Sjlemon} 240059290Sjlemon 240159290Sjlemon/* 2402151260Sambrisko * knote must already have been detached using the f_detach method. 2403133741Sjmg * no lock need to be held, it is assumed that the KN_INFLUX flag is set 2404133741Sjmg * to prevent other removal. 240559290Sjlemon */ 240659290Sjlemonstatic void 240783366Sjulianknote_drop(struct knote *kn, struct thread *td) 240859290Sjlemon{ 2409133741Sjmg struct kqueue *kq; 241059290Sjlemon struct klist *list; 241159290Sjlemon 2412133741Sjmg kq = kn->kn_kq; 2413133741Sjmg 2414133741Sjmg KQ_NOTOWNED(kq); 2415133741Sjmg KASSERT((kn->kn_status & KN_INFLUX) == KN_INFLUX, 2416133741Sjmg ("knote_drop called without KN_INFLUX set in kn_status")); 2417133741Sjmg 2418133741Sjmg KQ_LOCK(kq); 241959290Sjlemon if (kn->kn_fop->f_isfd) 2420133741Sjmg list = &kq->kq_knlist[kn->kn_id]; 242159290Sjlemon else 2422133741Sjmg list = &kq->kq_knhash[KN_HASH(kn->kn_id, kq->kq_knhashmask)]; 242359290Sjlemon 2424151260Sambrisko if (!SLIST_EMPTY(list)) 2425151260Sambrisko SLIST_REMOVE(list, kn, knote, kn_link); 242659290Sjlemon if (kn->kn_status & KN_QUEUED) 242759290Sjlemon knote_dequeue(kn); 2428133741Sjmg KQ_UNLOCK_FLUX(kq); 2429133741Sjmg 2430133741Sjmg if (kn->kn_fop->f_isfd) { 2431133741Sjmg fdrop(kn->kn_fp, td); 2432133741Sjmg kn->kn_fp = NULL; 2433133741Sjmg } 2434133741Sjmg kqueue_fo_release(kn->kn_kevent.filter); 2435133741Sjmg kn->kn_fop = NULL; 243659290Sjlemon knote_free(kn); 243759290Sjlemon} 243859290Sjlemon 243959290Sjlemonstatic void 244059290Sjlemonknote_enqueue(struct knote *kn) 244159290Sjlemon{ 244259290Sjlemon struct kqueue *kq = kn->kn_kq; 244359290Sjlemon 2444133741Sjmg KQ_OWNED(kn->kn_kq); 244559997Sjlemon KASSERT((kn->kn_status & KN_QUEUED) == 0, ("knote already queued")); 244659997Sjlemon 2447133590Srwatson TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); 244859290Sjlemon kn->kn_status |= KN_QUEUED; 244959290Sjlemon kq->kq_count++; 245059290Sjlemon kqueue_wakeup(kq); 245159290Sjlemon} 245259290Sjlemon 245359290Sjlemonstatic void 245459290Sjlemonknote_dequeue(struct knote *kn) 245559290Sjlemon{ 245659290Sjlemon struct kqueue *kq = kn->kn_kq; 245759290Sjlemon 2458133741Sjmg KQ_OWNED(kn->kn_kq); 245959997Sjlemon KASSERT(kn->kn_status & KN_QUEUED, ("knote not queued")); 246059997Sjlemon 2461133590Srwatson TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); 246259290Sjlemon kn->kn_status &= ~KN_QUEUED; 246359290Sjlemon kq->kq_count--; 246459290Sjlemon} 246559290Sjlemon 246659290Sjlemonstatic void 246759290Sjlemonknote_init(void) 246859290Sjlemon{ 2469133741Sjmg 247092751Sjeff knote_zone = uma_zcreate("KNOTE", sizeof(struct knote), NULL, NULL, 247192751Sjeff NULL, NULL, UMA_ALIGN_PTR, 0); 247259290Sjlemon} 2473177253SrwatsonSYSINIT(knote, SI_SUB_PSEUDO, SI_ORDER_ANY, knote_init, NULL); 247459290Sjlemon 247559290Sjlemonstatic struct knote * 2476133741Sjmgknote_alloc(int waitok) 247759290Sjlemon{ 2478287362Skib 2479287362Skib return (uma_zalloc(knote_zone, (waitok ? M_WAITOK : M_NOWAIT) | 2480287362Skib M_ZERO)); 248159290Sjlemon} 248259290Sjlemon 248359290Sjlemonstatic void 248459290Sjlemonknote_free(struct knote *kn) 248559290Sjlemon{ 2486287362Skib 2487287362Skib uma_zfree(knote_zone, kn); 248859290Sjlemon} 2489162594Sjmg 2490162594Sjmg/* 2491162594Sjmg * Register the kev w/ the kq specified by fd. 2492162594Sjmg */ 2493162594Sjmgint 2494162594Sjmgkqfd_register(int fd, struct kevent *kev, struct thread *td, int waitok) 2495162594Sjmg{ 2496162594Sjmg struct kqueue *kq; 2497162594Sjmg struct file *fp; 2498255219Spjd cap_rights_t rights; 2499162594Sjmg int error; 2500162594Sjmg 2501258181Spjd error = fget(td, fd, cap_rights_init(&rights, CAP_KQUEUE_CHANGE), &fp); 2502255219Spjd if (error != 0) 2503162594Sjmg return (error); 2504170029Srwatson if ((error = kqueue_acquire(fp, &kq)) != 0) 2505170029Srwatson goto noacquire; 2506162594Sjmg 2507162594Sjmg error = kqueue_register(kq, kev, td, waitok); 2508162594Sjmg 2509162594Sjmg kqueue_release(kq, 0); 2510162594Sjmg 2511170029Srwatsonnoacquire: 2512162608Sjmg fdrop(fp, td); 2513162594Sjmg 2514162594Sjmg return error; 2515162594Sjmg} 2516