kern_event.c revision 311046
159290Sjlemon/*- 272969Sjlemon * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org> 3133741Sjmg * Copyright 2004 John-Mark Gurney <jmg@FreeBSD.org> 4197240Ssson * Copyright (c) 2009 Apple, Inc. 559290Sjlemon * All rights reserved. 659290Sjlemon * 759290Sjlemon * Redistribution and use in source and binary forms, with or without 859290Sjlemon * modification, are permitted provided that the following conditions 959290Sjlemon * are met: 1059290Sjlemon * 1. Redistributions of source code must retain the above copyright 1159290Sjlemon * notice, this list of conditions and the following disclaimer. 1259290Sjlemon * 2. Redistributions in binary form must reproduce the above copyright 1359290Sjlemon * notice, this list of conditions and the following disclaimer in the 1459290Sjlemon * documentation and/or other materials provided with the distribution. 1559290Sjlemon * 1659290Sjlemon * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1759290Sjlemon * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1859290Sjlemon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1959290Sjlemon * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2059290Sjlemon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2159290Sjlemon * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2259290Sjlemon * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2359290Sjlemon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2459290Sjlemon * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2559290Sjlemon * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2659290Sjlemon * SUCH DAMAGE. 2759290Sjlemon */ 2859290Sjlemon 29116182Sobrien#include <sys/cdefs.h> 30116182Sobrien__FBSDID("$FreeBSD: stable/11/sys/kern/kern_event.c 311046 2017-01-02 08:20:26Z 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> 5159290Sjlemon#include <sys/queue.h> 5259290Sjlemon#include <sys/event.h> 5359290Sjlemon#include <sys/eventvar.h> 5459290Sjlemon#include <sys/poll.h> 5559290Sjlemon#include <sys/protosw.h> 56256849Skib#include <sys/resourcevar.h> 57132138Salfred#include <sys/sigio.h> 58132138Salfred#include <sys/signalvar.h> 5959290Sjlemon#include <sys/socket.h> 6059290Sjlemon#include <sys/socketvar.h> 6159290Sjlemon#include <sys/stat.h> 6284138Sjlemon#include <sys/sysctl.h> 6359290Sjlemon#include <sys/sysproto.h> 64142934Sps#include <sys/syscallsubr.h> 65133741Sjmg#include <sys/taskqueue.h> 6659290Sjlemon#include <sys/uio.h> 67271976Sjhb#include <sys/user.h> 68162592Sjmg#ifdef KTRACE 69162592Sjmg#include <sys/ktrace.h> 70162592Sjmg#endif 71310469Skib#include <machine/atomic.h> 7259290Sjlemon 7392751Sjeff#include <vm/uma.h> 7459290Sjlemon 75141616Sphkstatic MALLOC_DEFINE(M_KQUEUE, "kqueue", "memory for kqueue system"); 76141616Sphk 77133741Sjmg/* 78133741Sjmg * This lock is used if multiple kq locks are required. This possibly 79133741Sjmg * should be made into a per proc lock. 80133741Sjmg */ 81133741Sjmgstatic struct mtx kq_global; 82133741SjmgMTX_SYSINIT(kq_global, &kq_global, "kqueue order", MTX_DEF); 83133741Sjmg#define KQ_GLOBAL_LOCK(lck, haslck) do { \ 84133741Sjmg if (!haslck) \ 85133741Sjmg mtx_lock(lck); \ 86133741Sjmg haslck = 1; \ 87133741Sjmg} while (0) 88133741Sjmg#define KQ_GLOBAL_UNLOCK(lck, haslck) do { \ 89133741Sjmg if (haslck) \ 90133741Sjmg mtx_unlock(lck); \ 91133741Sjmg haslck = 0; \ 92133741Sjmg} while (0) 9384138Sjlemon 94300627SkibTASKQUEUE_DEFINE_THREAD(kqueue_ctx); 95133741Sjmg 96146950Spsstatic int kevent_copyout(void *arg, struct kevent *kevp, int count); 97146950Spsstatic int kevent_copyin(void *arg, struct kevent *kevp, int count); 98162594Sjmgstatic int kqueue_register(struct kqueue *kq, struct kevent *kev, 99162594Sjmg struct thread *td, int waitok); 100170029Srwatsonstatic int kqueue_acquire(struct file *fp, struct kqueue **kqp); 101133741Sjmgstatic void kqueue_release(struct kqueue *kq, int locked); 102286631Sedstatic void kqueue_destroy(struct kqueue *kq); 103286631Sedstatic void kqueue_drain(struct kqueue *kq, struct thread *td); 104133741Sjmgstatic int kqueue_expand(struct kqueue *kq, struct filterops *fops, 105133741Sjmg uintptr_t ident, int waitok); 106133741Sjmgstatic void kqueue_task(void *arg, int pending); 107133741Sjmgstatic int kqueue_scan(struct kqueue *kq, int maxevents, 108146950Sps struct kevent_copyops *k_ops, 109146950Sps const struct timespec *timeout, 110146950Sps struct kevent *keva, struct thread *td); 11159290Sjlemonstatic void kqueue_wakeup(struct kqueue *kq); 112133741Sjmgstatic struct filterops *kqueue_fo_find(int filt); 113133741Sjmgstatic void kqueue_fo_release(int filt); 11459290Sjlemon 115255675Srdivackystatic fo_ioctl_t kqueue_ioctl; 116255675Srdivackystatic fo_poll_t kqueue_poll; 117255675Srdivackystatic fo_kqfilter_t kqueue_kqfilter; 118255675Srdivackystatic fo_stat_t kqueue_stat; 119255675Srdivackystatic fo_close_t kqueue_close; 120271976Sjhbstatic fo_fill_kinfo_t kqueue_fill_kinfo; 121255675Srdivacky 122255675Srdivackystatic struct fileops kqueueops = { 123271489Sjhb .fo_read = invfo_rdwr, 124271489Sjhb .fo_write = invfo_rdwr, 125271489Sjhb .fo_truncate = invfo_truncate, 126116546Sphk .fo_ioctl = kqueue_ioctl, 127116546Sphk .fo_poll = kqueue_poll, 128116546Sphk .fo_kqfilter = kqueue_kqfilter, 129116546Sphk .fo_stat = kqueue_stat, 130116546Sphk .fo_close = kqueue_close, 131224914Skib .fo_chmod = invfo_chmod, 132224914Skib .fo_chown = invfo_chown, 133254356Sglebius .fo_sendfile = invfo_sendfile, 134271976Sjhb .fo_fill_kinfo = kqueue_fill_kinfo, 13572521Sjlemon}; 13672521Sjlemon 137133741Sjmgstatic int knote_attach(struct knote *kn, struct kqueue *kq); 13883366Sjulianstatic void knote_drop(struct knote *kn, struct thread *td); 13959290Sjlemonstatic void knote_enqueue(struct knote *kn); 14059290Sjlemonstatic void knote_dequeue(struct knote *kn); 14159290Sjlemonstatic void knote_init(void); 142133741Sjmgstatic struct knote *knote_alloc(int waitok); 14359290Sjlemonstatic void knote_free(struct knote *kn); 14459290Sjlemon 14572521Sjlemonstatic void filt_kqdetach(struct knote *kn); 14672521Sjlemonstatic int filt_kqueue(struct knote *kn, long hint); 14772521Sjlemonstatic int filt_procattach(struct knote *kn); 14872521Sjlemonstatic void filt_procdetach(struct knote *kn); 14972521Sjlemonstatic int filt_proc(struct knote *kn, long hint); 15072521Sjlemonstatic int filt_fileattach(struct knote *kn); 15179989Sjlemonstatic void filt_timerexpire(void *knx); 15279989Sjlemonstatic int filt_timerattach(struct knote *kn); 15379989Sjlemonstatic void filt_timerdetach(struct knote *kn); 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; 191310469Skibstatic unsigned int kq_ncallouts = 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)) 594311006Skib 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)) 603311006Skib 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)) 613311006Skib 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)) 623311006Skib return (SBT_MAX); 624296775Sgibbs#endif 625296775Sgibbs return (secs << 32 | US_TO_SBT(data % 1000000000)); 626296775Sgibbs } 627311006Skib return (NS_TO_SBT(data)); 628296775Sgibbs default: 629268843Sbapt break; 630268843Sbapt } 631296775Sgibbs return (-1); 632133741Sjmg} 633133741Sjmg 634311007Skibstruct kq_timer_cb_data { 635311007Skib struct callout c; 636311007Skib sbintime_t next; /* next timer event fires at */ 637311007Skib sbintime_t to; /* precalculated timer period */ 638311007Skib}; 639311007Skib 64079989Sjlemonstatic void 64179989Sjlemonfilt_timerexpire(void *knx) 64279989Sjlemon{ 643247804Sdavide struct knote *kn; 644311007Skib struct kq_timer_cb_data *kc; 64579989Sjlemon 646247804Sdavide kn = knx; 64779989Sjlemon kn->kn_data++; 648133741Sjmg KNOTE_ACTIVATE(kn, 0); /* XXX - handle locking */ 64979989Sjlemon 650311007Skib if ((kn->kn_flags & EV_ONESHOT) != 0) 651311007Skib return; 652311007Skib 653311007Skib kc = kn->kn_ptr.p_v; 654311007Skib kc->next += kc->to; 655311007Skib callout_reset_sbt_on(&kc->c, kc->next, 0, filt_timerexpire, kn, 656311007Skib PCPU_GET(cpuid), C_ABSOLUTE); 65779989Sjlemon} 65879989Sjlemon 65979989Sjlemon/* 660268843Sbapt * data contains amount of time to sleep 661133590Srwatson */ 66279989Sjlemonstatic int 66379989Sjlemonfilt_timerattach(struct knote *kn) 66479989Sjlemon{ 665311007Skib struct kq_timer_cb_data *kc; 666255882Skib sbintime_t to; 667251803Sed unsigned int ncallouts; 66879989Sjlemon 669311007Skib if (kn->kn_sdata < 0) 670255882Skib return (EINVAL); 671311007Skib if (kn->kn_sdata == 0 && (kn->kn_flags & EV_ONESHOT) == 0) 672255882Skib kn->kn_sdata = 1; 673268843Sbapt /* Only precision unit are supported in flags so far */ 674311007Skib if ((kn->kn_sfflags & ~NOTE_TIMER_PRECMASK) != 0) 675268843Sbapt return (EINVAL); 676268843Sbapt 677268843Sbapt to = timer2sbintime(kn->kn_sdata, kn->kn_sfflags); 678255882Skib if (to < 0) 679255882Skib return (EINVAL); 680255882Skib 681251803Sed do { 682310469Skib ncallouts = kq_ncallouts; 683251803Sed if (ncallouts >= kq_calloutmax) 684251803Sed return (ENOMEM); 685310469Skib } while (!atomic_cmpset_int(&kq_ncallouts, ncallouts, ncallouts + 1)); 686133741Sjmg 68779989Sjlemon kn->kn_flags |= EV_CLEAR; /* automatically set */ 688254932Sjmg kn->kn_status &= ~KN_DETACHED; /* knlist_add clears it */ 689311007Skib kn->kn_ptr.p_v = kc = malloc(sizeof(*kc), M_KQUEUE, M_WAITOK); 690311007Skib callout_init(&kc->c, 1); 691311007Skib kc->next = to + sbinuptime(); 692311007Skib kc->to = to; 693311007Skib callout_reset_sbt_on(&kc->c, kc->next, 0, filt_timerexpire, kn, 694311007Skib PCPU_GET(cpuid), C_ABSOLUTE); 69579989Sjlemon 69679989Sjlemon return (0); 69779989Sjlemon} 69879989Sjlemon 69979989Sjlemonstatic void 70079989Sjlemonfilt_timerdetach(struct knote *kn) 70179989Sjlemon{ 702311007Skib struct kq_timer_cb_data *kc; 703251803Sed unsigned int old; 70479989Sjlemon 705311007Skib kc = kn->kn_ptr.p_v; 706311007Skib callout_drain(&kc->c); 707311007Skib free(kc, M_KQUEUE); 708310469Skib old = atomic_fetchadd_int(&kq_ncallouts, -1); 709251803Sed KASSERT(old > 0, ("Number of callouts cannot become negative")); 710254932Sjmg kn->kn_status |= KN_DETACHED; /* knlist_remove sets it */ 71179989Sjlemon} 71279989Sjlemon 71379989Sjlemonstatic int 71479989Sjlemonfilt_timer(struct knote *kn, long hint) 71579989Sjlemon{ 71679989Sjlemon 71779989Sjlemon return (kn->kn_data != 0); 71879989Sjlemon} 71979989Sjlemon 720197241Sssonstatic int 721197241Sssonfilt_userattach(struct knote *kn) 722197241Ssson{ 723197241Ssson 724197241Ssson /* 725197241Ssson * EVFILT_USER knotes are not attached to anything in the kernel. 726197241Ssson */ 727197241Ssson kn->kn_hook = NULL; 728197241Ssson if (kn->kn_fflags & NOTE_TRIGGER) 729197241Ssson kn->kn_hookid = 1; 730197241Ssson else 731197241Ssson kn->kn_hookid = 0; 732197241Ssson return (0); 733197241Ssson} 734197241Ssson 735197241Sssonstatic void 736197241Sssonfilt_userdetach(__unused struct knote *kn) 737197241Ssson{ 738197241Ssson 739197241Ssson /* 740197241Ssson * EVFILT_USER knotes are not attached to anything in the kernel. 741197241Ssson */ 742197241Ssson} 743197241Ssson 744197241Sssonstatic int 745197241Sssonfilt_user(struct knote *kn, __unused long hint) 746197241Ssson{ 747197241Ssson 748197241Ssson return (kn->kn_hookid); 749197241Ssson} 750197241Ssson 751197241Sssonstatic void 752197407Srdivackyfilt_usertouch(struct knote *kn, struct kevent *kev, u_long type) 753197241Ssson{ 754197407Srdivacky u_int ffctrl; 755197241Ssson 756197241Ssson switch (type) { 757197241Ssson case EVENT_REGISTER: 758197241Ssson if (kev->fflags & NOTE_TRIGGER) 759197241Ssson kn->kn_hookid = 1; 760197241Ssson 761197241Ssson ffctrl = kev->fflags & NOTE_FFCTRLMASK; 762197241Ssson kev->fflags &= NOTE_FFLAGSMASK; 763197241Ssson switch (ffctrl) { 764197241Ssson case NOTE_FFNOP: 765197241Ssson break; 766197241Ssson 767197241Ssson case NOTE_FFAND: 768197241Ssson kn->kn_sfflags &= kev->fflags; 769197241Ssson break; 770197241Ssson 771197241Ssson case NOTE_FFOR: 772197241Ssson kn->kn_sfflags |= kev->fflags; 773197241Ssson break; 774197241Ssson 775197241Ssson case NOTE_FFCOPY: 776197241Ssson kn->kn_sfflags = kev->fflags; 777197241Ssson break; 778197241Ssson 779197241Ssson default: 780197241Ssson /* XXX Return error? */ 781197241Ssson break; 782197241Ssson } 783197241Ssson kn->kn_sdata = kev->data; 784197241Ssson if (kev->flags & EV_CLEAR) { 785197241Ssson kn->kn_hookid = 0; 786197241Ssson kn->kn_data = 0; 787197241Ssson kn->kn_fflags = 0; 788197241Ssson } 789197241Ssson break; 790197241Ssson 791197241Ssson case EVENT_PROCESS: 792197241Ssson *kev = kn->kn_kevent; 793197241Ssson kev->fflags = kn->kn_sfflags; 794197241Ssson kev->data = kn->kn_sdata; 795197241Ssson if (kn->kn_flags & EV_CLEAR) { 796197241Ssson kn->kn_hookid = 0; 797197241Ssson kn->kn_data = 0; 798197241Ssson kn->kn_fflags = 0; 799197241Ssson } 800197241Ssson break; 801197241Ssson 802197241Ssson default: 803197241Ssson panic("filt_usertouch() - invalid type (%ld)", type); 804197241Ssson break; 805197241Ssson } 806197241Ssson} 807197241Ssson 80861468Sjlemonint 809225617Skmacysys_kqueue(struct thread *td, struct kqueue_args *uap) 81059290Sjlemon{ 811283440Sdchagin 812286309Sed return (kern_kqueue(td, 0, NULL)); 813283440Sdchagin} 814283440Sdchagin 815286631Sedstatic void 816286631Sedkqueue_init(struct kqueue *kq) 817286631Sed{ 818286631Sed 819286631Sed mtx_init(&kq->kq_lock, "kqueue", NULL, MTX_DEF | MTX_DUPOK); 820286631Sed TAILQ_INIT(&kq->kq_head); 821286631Sed knlist_init_mtx(&kq->kq_sel.si_note, &kq->kq_lock); 822286631Sed TASK_INIT(&kq->kq_task, 0, kqueue_task, kq); 823286631Sed} 824286631Sed 825283440Sdchaginint 826286309Sedkern_kqueue(struct thread *td, int flags, struct filecaps *fcaps) 827283440Sdchagin{ 828255675Srdivacky struct filedesc *fdp; 829255675Srdivacky struct kqueue *kq; 830255675Srdivacky struct file *fp; 831256849Skib struct ucred *cred; 832255675Srdivacky int fd, error; 833255675Srdivacky 834288145Smjg fdp = td->td_proc->p_fd; 835256849Skib cred = td->td_ucred; 836288145Smjg if (!chgkqcnt(cred->cr_ruidinfo, 1, lim_cur(td, RLIMIT_KQUEUES))) 837257597Sjilles return (ENOMEM); 838256849Skib 839286309Sed error = falloc_caps(td, &fp, &fd, flags, fcaps); 840288145Smjg if (error != 0) { 841288145Smjg chgkqcnt(cred->cr_ruidinfo, -1, 0); 842288145Smjg return (error); 843288145Smjg } 844255675Srdivacky 845255675Srdivacky /* An extra reference on `fp' has been held for us by falloc(). */ 846255675Srdivacky kq = malloc(sizeof *kq, M_KQUEUE, M_WAITOK | M_ZERO); 847286631Sed kqueue_init(kq); 848255675Srdivacky kq->kq_fdp = fdp; 849288145Smjg kq->kq_cred = crhold(cred); 850255675Srdivacky 851255675Srdivacky FILEDESC_XLOCK(fdp); 852255675Srdivacky TAILQ_INSERT_HEAD(&fdp->fd_kqlist, kq, kq_list); 853255675Srdivacky FILEDESC_XUNLOCK(fdp); 854255675Srdivacky 855255675Srdivacky finit(fp, FREAD | FWRITE, DTYPE_KQUEUE, kq, &kqueueops); 856255675Srdivacky fdrop(fp, td); 857255675Srdivacky 858255675Srdivacky td->td_retval[0] = fd; 859288145Smjg return (0); 86059290Sjlemon} 86159290Sjlemon 86259290Sjlemon#ifndef _SYS_SYSPROTO_H_ 86359290Sjlemonstruct kevent_args { 86459290Sjlemon int fd; 86563977Speter const struct kevent *changelist; 86659290Sjlemon int nchanges; 86763452Sjlemon struct kevent *eventlist; 86859290Sjlemon int nevents; 86963977Speter const struct timespec *timeout; 87059290Sjlemon}; 87159290Sjlemon#endif 87259290Sjlemonint 873225617Skmacysys_kevent(struct thread *td, struct kevent_args *uap) 87459290Sjlemon{ 875142934Sps struct timespec ts, *tsp; 876146950Sps struct kevent_copyops k_ops = { uap, 877146950Sps kevent_copyout, 878146950Sps kevent_copyin}; 879142934Sps int error; 880162592Sjmg#ifdef KTRACE 881162592Sjmg struct uio ktruio; 882162592Sjmg struct iovec ktriov; 883162592Sjmg struct uio *ktruioin = NULL; 884162592Sjmg struct uio *ktruioout = NULL; 885162592Sjmg#endif 886142934Sps 887142934Sps if (uap->timeout != NULL) { 888142934Sps error = copyin(uap->timeout, &ts, sizeof(ts)); 889142934Sps if (error) 890142934Sps return (error); 891142934Sps tsp = &ts; 892142934Sps } else 893142934Sps tsp = NULL; 894142934Sps 895162592Sjmg#ifdef KTRACE 896162592Sjmg if (KTRPOINT(td, KTR_GENIO)) { 897162592Sjmg ktriov.iov_base = uap->changelist; 898162592Sjmg ktriov.iov_len = uap->nchanges * sizeof(struct kevent); 899162592Sjmg ktruio = (struct uio){ .uio_iov = &ktriov, .uio_iovcnt = 1, 900162592Sjmg .uio_segflg = UIO_USERSPACE, .uio_rw = UIO_READ, 901162592Sjmg .uio_td = td }; 902162592Sjmg ktruioin = cloneuio(&ktruio); 903162592Sjmg ktriov.iov_base = uap->eventlist; 904162592Sjmg ktriov.iov_len = uap->nevents * sizeof(struct kevent); 905162592Sjmg ktruioout = cloneuio(&ktruio); 906162592Sjmg } 907162592Sjmg#endif 908162592Sjmg 909162592Sjmg error = kern_kevent(td, uap->fd, uap->nchanges, uap->nevents, 910162592Sjmg &k_ops, tsp); 911162592Sjmg 912162592Sjmg#ifdef KTRACE 913162592Sjmg if (ktruioin != NULL) { 914162592Sjmg ktruioin->uio_resid = uap->nchanges * sizeof(struct kevent); 915162592Sjmg ktrgenio(uap->fd, UIO_WRITE, ktruioin, 0); 916162592Sjmg ktruioout->uio_resid = td->td_retval[0] * sizeof(struct kevent); 917162592Sjmg ktrgenio(uap->fd, UIO_READ, ktruioout, error); 918162592Sjmg } 919162592Sjmg#endif 920162592Sjmg 921162592Sjmg return (error); 922142934Sps} 923142934Sps 924142934Sps/* 925146950Sps * Copy 'count' items into the destination list pointed to by uap->eventlist. 926142934Sps */ 927142934Spsstatic int 928146950Spskevent_copyout(void *arg, struct kevent *kevp, int count) 929142934Sps{ 930146950Sps struct kevent_args *uap; 931142934Sps int error; 932142934Sps 933146950Sps KASSERT(count <= KQ_NEVENTS, ("count (%d) > KQ_NEVENTS", count)); 934146950Sps uap = (struct kevent_args *)arg; 935146950Sps 936146950Sps error = copyout(kevp, uap->eventlist, count * sizeof *kevp); 937146950Sps if (error == 0) 938146950Sps uap->eventlist += count; 939142934Sps return (error); 940142934Sps} 941142934Sps 942146950Sps/* 943146950Sps * Copy 'count' items from the list pointed to by uap->changelist. 944146950Sps */ 945146950Spsstatic int 946146950Spskevent_copyin(void *arg, struct kevent *kevp, int count) 947146950Sps{ 948146950Sps struct kevent_args *uap; 949146950Sps int error; 950146950Sps 951146950Sps KASSERT(count <= KQ_NEVENTS, ("count (%d) > KQ_NEVENTS", count)); 952146950Sps uap = (struct kevent_args *)arg; 953146950Sps 954146950Sps error = copyin(uap->changelist, kevp, count * sizeof *kevp); 955146950Sps if (error == 0) 956146950Sps uap->changelist += count; 957146950Sps return (error); 958146950Sps} 959146950Sps 960142934Spsint 961146950Spskern_kevent(struct thread *td, int fd, int nchanges, int nevents, 962146950Sps struct kevent_copyops *k_ops, const struct timespec *timeout) 963142934Sps{ 964283440Sdchagin cap_rights_t rights; 965255675Srdivacky struct file *fp; 966283440Sdchagin int error; 96759290Sjlemon 968258181Spjd cap_rights_init(&rights); 969258181Spjd if (nchanges > 0) 970258181Spjd cap_rights_set(&rights, CAP_KQUEUE_CHANGE); 971258181Spjd if (nevents > 0) 972258181Spjd cap_rights_set(&rights, CAP_KQUEUE_EVENT); 973258181Spjd error = fget(td, fd, &rights, &fp); 974255675Srdivacky if (error != 0) 975255675Srdivacky return (error); 976258181Spjd 977283440Sdchagin error = kern_kevent_fp(td, fp, nchanges, nevents, k_ops, timeout); 978283440Sdchagin fdrop(fp, td); 979283440Sdchagin 980283440Sdchagin return (error); 981283440Sdchagin} 982283440Sdchagin 983286631Sedstatic int 984286631Sedkqueue_kevent(struct kqueue *kq, struct thread *td, int nchanges, int nevents, 985283440Sdchagin struct kevent_copyops *k_ops, const struct timespec *timeout) 986283440Sdchagin{ 987283440Sdchagin struct kevent keva[KQ_NEVENTS]; 988283440Sdchagin struct kevent *kevp, *changes; 989283440Sdchagin int i, n, nerrors, error; 990283440Sdchagin 99159290Sjlemon nerrors = 0; 992142934Sps while (nchanges > 0) { 993146950Sps n = nchanges > KQ_NEVENTS ? KQ_NEVENTS : nchanges; 994146950Sps error = k_ops->k_copyin(k_ops->arg, keva, n); 995146950Sps if (error) 996286631Sed return (error); 997146950Sps changes = keva; 99859290Sjlemon for (i = 0; i < n; i++) { 999142934Sps kevp = &changes[i]; 1000151260Sambrisko if (!kevp->filter) 1001151260Sambrisko continue; 100263452Sjlemon kevp->flags &= ~EV_SYSFLAGS; 1003133741Sjmg error = kqueue_register(kq, kevp, td, 1); 1004197243Ssson if (error || (kevp->flags & EV_RECEIPT)) { 1005286631Sed if (nevents == 0) 1006286631Sed return (error); 1007286631Sed kevp->flags = EV_ERROR; 1008286631Sed kevp->data = error; 1009286631Sed (void)k_ops->k_copyout(k_ops->arg, kevp, 1); 1010286631Sed nevents--; 1011286631Sed nerrors++; 101259290Sjlemon } 101359290Sjlemon } 1014142934Sps nchanges -= n; 101559290Sjlemon } 101659290Sjlemon if (nerrors) { 1017133741Sjmg td->td_retval[0] = nerrors; 1018286631Sed return (0); 101959290Sjlemon } 102059290Sjlemon 1021286631Sed return (kqueue_scan(kq, nevents, k_ops, timeout, keva, td)); 1022286631Sed} 1023286631Sed 1024286631Sedint 1025286631Sedkern_kevent_fp(struct thread *td, struct file *fp, int nchanges, int nevents, 1026286631Sed struct kevent_copyops *k_ops, const struct timespec *timeout) 1027286631Sed{ 1028286631Sed struct kqueue *kq; 1029286631Sed int error; 1030286631Sed 1031286631Sed error = kqueue_acquire(fp, &kq); 1032286631Sed if (error != 0) 1033286631Sed return (error); 1034286631Sed error = kqueue_kevent(kq, td, nchanges, nevents, k_ops, timeout); 1035133741Sjmg kqueue_release(kq, 0); 103659290Sjlemon return (error); 103759290Sjlemon} 103859290Sjlemon 1039286681Sed/* 1040286681Sed * Performs a kevent() call on a temporarily created kqueue. This can be 1041286681Sed * used to perform one-shot polling, similar to poll() and select(). 1042286681Sed */ 104359290Sjlemonint 1044286631Sedkern_kevent_anonymous(struct thread *td, int nevents, 1045286631Sed struct kevent_copyops *k_ops) 1046286631Sed{ 1047286631Sed struct kqueue kq = {}; 1048286631Sed int error; 1049286631Sed 1050286631Sed kqueue_init(&kq); 1051286631Sed kq.kq_refcnt = 1; 1052286631Sed error = kqueue_kevent(&kq, td, nevents, nevents, k_ops, NULL); 1053286631Sed kqueue_drain(&kq, td); 1054286631Sed kqueue_destroy(&kq); 1055286631Sed return (error); 1056286631Sed} 1057286631Sed 1058286631Sedint 105988633Salfredkqueue_add_filteropts(int filt, struct filterops *filtops) 106088633Salfred{ 1061133741Sjmg int error; 106288633Salfred 1063201352Sbrooks error = 0; 1064133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) { 1065133741Sjmg printf( 1066133741Sjmg"trying to add a filterop that is out of range: %d is beyond %d\n", 1067133741Sjmg ~filt, EVFILT_SYSCOUNT); 1068133741Sjmg return EINVAL; 1069133741Sjmg } 1070133741Sjmg mtx_lock(&filterops_lock); 1071133741Sjmg if (sysfilt_ops[~filt].for_fop != &null_filtops && 1072133741Sjmg sysfilt_ops[~filt].for_fop != NULL) 1073133741Sjmg error = EEXIST; 1074133741Sjmg else { 1075133741Sjmg sysfilt_ops[~filt].for_fop = filtops; 1076133741Sjmg sysfilt_ops[~filt].for_refcnt = 0; 1077133741Sjmg } 1078133741Sjmg mtx_unlock(&filterops_lock); 1079133741Sjmg 1080201352Sbrooks return (error); 108188633Salfred} 108288633Salfred 108388633Salfredint 108488633Salfredkqueue_del_filteropts(int filt) 108588633Salfred{ 1086133741Sjmg int error; 108788633Salfred 1088133741Sjmg error = 0; 1089133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1090133741Sjmg return EINVAL; 1091133741Sjmg 1092133741Sjmg mtx_lock(&filterops_lock); 1093133741Sjmg if (sysfilt_ops[~filt].for_fop == &null_filtops || 1094133741Sjmg sysfilt_ops[~filt].for_fop == NULL) 1095133741Sjmg error = EINVAL; 1096133741Sjmg else if (sysfilt_ops[~filt].for_refcnt != 0) 1097133741Sjmg error = EBUSY; 1098133741Sjmg else { 1099133741Sjmg sysfilt_ops[~filt].for_fop = &null_filtops; 1100133741Sjmg sysfilt_ops[~filt].for_refcnt = 0; 1101133741Sjmg } 1102133741Sjmg mtx_unlock(&filterops_lock); 1103133741Sjmg 1104133741Sjmg return error; 110588633Salfred} 110688633Salfred 1107133741Sjmgstatic struct filterops * 1108133741Sjmgkqueue_fo_find(int filt) 1109133741Sjmg{ 1110133741Sjmg 1111133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1112133741Sjmg return NULL; 1113133741Sjmg 1114274560Sjmg if (sysfilt_ops[~filt].for_nolock) 1115274560Sjmg return sysfilt_ops[~filt].for_fop; 1116274560Sjmg 1117133741Sjmg mtx_lock(&filterops_lock); 1118133741Sjmg sysfilt_ops[~filt].for_refcnt++; 1119133741Sjmg if (sysfilt_ops[~filt].for_fop == NULL) 1120133741Sjmg sysfilt_ops[~filt].for_fop = &null_filtops; 1121133741Sjmg mtx_unlock(&filterops_lock); 1122133741Sjmg 1123133741Sjmg return sysfilt_ops[~filt].for_fop; 1124133741Sjmg} 1125133741Sjmg 1126133741Sjmgstatic void 1127133741Sjmgkqueue_fo_release(int filt) 1128133741Sjmg{ 1129133741Sjmg 1130133741Sjmg if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) 1131133741Sjmg return; 1132133741Sjmg 1133274560Sjmg if (sysfilt_ops[~filt].for_nolock) 1134274560Sjmg return; 1135274560Sjmg 1136133741Sjmg mtx_lock(&filterops_lock); 1137133741Sjmg KASSERT(sysfilt_ops[~filt].for_refcnt > 0, 1138133741Sjmg ("filter object refcount not valid on release")); 1139133741Sjmg sysfilt_ops[~filt].for_refcnt--; 1140133741Sjmg mtx_unlock(&filterops_lock); 1141133741Sjmg} 1142133741Sjmg 1143133741Sjmg/* 1144170029Srwatson * A ref to kq (obtained via kqueue_acquire) must be held. waitok will 1145133741Sjmg * influence if memory allocation should wait. Make sure it is 0 if you 1146133741Sjmg * hold any mutexes. 1147133741Sjmg */ 1148162594Sjmgstatic int 1149133741Sjmgkqueue_register(struct kqueue *kq, struct kevent *kev, struct thread *td, int waitok) 115059290Sjlemon{ 115159290Sjlemon struct filterops *fops; 1152133741Sjmg struct file *fp; 1153133741Sjmg struct knote *kn, *tkn; 1154302235Skib struct knlist *knl; 1155255219Spjd cap_rights_t rights; 1156133741Sjmg int error, filt, event; 1157255798Skib int haskqglobal, filedesc_unlock; 115859290Sjlemon 1159295785Smarkj if ((kev->flags & (EV_ENABLE | EV_DISABLE)) == (EV_ENABLE | EV_DISABLE)) 1160295785Smarkj return (EINVAL); 1161295785Smarkj 1162133741Sjmg fp = NULL; 1163133741Sjmg kn = NULL; 1164302235Skib knl = NULL; 1165133741Sjmg error = 0; 1166133741Sjmg haskqglobal = 0; 1167255798Skib filedesc_unlock = 0; 116859290Sjlemon 1169133741Sjmg filt = kev->filter; 1170133741Sjmg fops = kqueue_fo_find(filt); 1171133741Sjmg if (fops == NULL) 1172133741Sjmg return EINVAL; 1173133741Sjmg 1174287362Skib if (kev->flags & EV_ADD) { 1175287362Skib /* 1176287362Skib * Prevent waiting with locks. Non-sleepable 1177287362Skib * allocation failures are handled in the loop, only 1178287362Skib * if the spare knote appears to be actually required. 1179287362Skib */ 1180287362Skib tkn = knote_alloc(waitok); 1181287362Skib } else { 1182274560Sjmg tkn = NULL; 1183287362Skib } 1184133741Sjmg 1185133741Sjmgfindkn: 118659290Sjlemon if (fops->f_isfd) { 1187133741Sjmg KASSERT(td != NULL, ("td is NULL")); 1188303216Skib if (kev->ident > INT_MAX) 1189303216Skib error = EBADF; 1190303216Skib else 1191303216Skib error = fget(td, kev->ident, 1192303216Skib cap_rights_init(&rights, CAP_EVENT), &fp); 1193159553Sjhb if (error) 1194133741Sjmg goto done; 119559290Sjlemon 1196133741Sjmg if ((kev->flags & EV_ADD) == EV_ADD && kqueue_expand(kq, fops, 1197133741Sjmg kev->ident, 0) != 0) { 1198159553Sjhb /* try again */ 1199133741Sjmg fdrop(fp, td); 1200133741Sjmg fp = NULL; 1201133741Sjmg error = kqueue_expand(kq, fops, kev->ident, waitok); 1202133741Sjmg if (error) 1203133741Sjmg goto done; 1204133741Sjmg goto findkn; 1205133741Sjmg } 1206133741Sjmg 1207133741Sjmg if (fp->f_type == DTYPE_KQUEUE) { 1208133741Sjmg /* 1209295012Svangyzen * If we add some intelligence about what we are doing, 1210133741Sjmg * we should be able to support events on ourselves. 1211133741Sjmg * We need to know when we are doing this to prevent 1212133741Sjmg * getting both the knlist lock and the kq lock since 1213133741Sjmg * they are the same thing. 1214133741Sjmg */ 1215133741Sjmg if (fp->f_data == kq) { 1216133741Sjmg error = EINVAL; 1217159172Spjd goto done; 1218133741Sjmg } 1219133741Sjmg 1220255798Skib /* 1221255798Skib * Pre-lock the filedesc before the global 1222255798Skib * lock mutex, see the comment in 1223255798Skib * kqueue_close(). 1224255798Skib */ 1225255798Skib FILEDESC_XLOCK(td->td_proc->p_fd); 1226255798Skib filedesc_unlock = 1; 1227133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1228133741Sjmg } 1229133741Sjmg 1230133741Sjmg KQ_LOCK(kq); 1231133741Sjmg if (kev->ident < kq->kq_knlistsize) { 1232133741Sjmg SLIST_FOREACH(kn, &kq->kq_knlist[kev->ident], kn_link) 1233133741Sjmg if (kev->filter == kn->kn_filter) 123459290Sjlemon break; 123559290Sjlemon } 123659290Sjlemon } else { 1237133741Sjmg if ((kev->flags & EV_ADD) == EV_ADD) 1238133741Sjmg kqueue_expand(kq, fops, kev->ident, waitok); 1239133741Sjmg 1240133741Sjmg KQ_LOCK(kq); 1241295012Svangyzen 1242295012Svangyzen /* 1243295012Svangyzen * If possible, find an existing knote to use for this kevent. 1244295012Svangyzen */ 1245295012Svangyzen if (kev->filter == EVFILT_PROC && 1246295012Svangyzen (kev->flags & (EV_FLAG1 | EV_FLAG2)) != 0) { 1247295012Svangyzen /* This is an internal creation of a process tracking 1248295012Svangyzen * note. Don't attempt to coalesce this with an 1249295012Svangyzen * existing note. 1250295012Svangyzen */ 1251295012Svangyzen ; 1252295012Svangyzen } else if (kq->kq_knhashmask != 0) { 125359290Sjlemon struct klist *list; 1254133635Sjmg 1255133741Sjmg list = &kq->kq_knhash[ 1256133741Sjmg KN_HASH((u_long)kev->ident, kq->kq_knhashmask)]; 125759290Sjlemon SLIST_FOREACH(kn, list, kn_link) 125859290Sjlemon if (kev->ident == kn->kn_id && 125959290Sjlemon kev->filter == kn->kn_filter) 126059290Sjlemon break; 126159290Sjlemon } 126259290Sjlemon } 126359290Sjlemon 1264295012Svangyzen /* knote is in the process of changing, wait for it to stabilize. */ 1265133741Sjmg if (kn != NULL && (kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1266197930Skib KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1267255798Skib if (filedesc_unlock) { 1268255798Skib FILEDESC_XUNLOCK(td->td_proc->p_fd); 1269255798Skib filedesc_unlock = 0; 1270255798Skib } 1271197930Skib kq->kq_state |= KQ_FLUXWAIT; 1272197930Skib msleep(kq, &kq->kq_lock, PSOCK | PDROP, "kqflxwt", 0); 1273133741Sjmg if (fp != NULL) { 1274133741Sjmg fdrop(fp, td); 1275133741Sjmg fp = NULL; 1276133741Sjmg } 1277133741Sjmg goto findkn; 1278133741Sjmg } 1279133741Sjmg 128059290Sjlemon /* 128159290Sjlemon * kn now contains the matching knote, or NULL if no match 128259290Sjlemon */ 1283197240Ssson if (kn == NULL) { 1284197240Ssson if (kev->flags & EV_ADD) { 1285133741Sjmg kn = tkn; 1286133741Sjmg tkn = NULL; 128768883Sdillon if (kn == NULL) { 1288159173Spjd KQ_UNLOCK(kq); 128968883Sdillon error = ENOMEM; 129068883Sdillon goto done; 129168883Sdillon } 129259290Sjlemon kn->kn_fp = fp; 129359290Sjlemon kn->kn_kq = kq; 129459290Sjlemon kn->kn_fop = fops; 129568883Sdillon /* 1296133741Sjmg * apply reference counts to knote structure, and 129768883Sdillon * do not release it at the end of this routine. 129868883Sdillon */ 1299133741Sjmg fops = NULL; 130068883Sdillon fp = NULL; 130168883Sdillon 130261962Sjlemon kn->kn_sfflags = kev->fflags; 130361962Sjlemon kn->kn_sdata = kev->data; 130461962Sjlemon kev->fflags = 0; 130561962Sjlemon kev->data = 0; 130661962Sjlemon kn->kn_kevent = *kev; 1307157383Sjmg kn->kn_kevent.flags &= ~(EV_ADD | EV_DELETE | 1308274560Sjmg EV_ENABLE | EV_DISABLE | EV_FORCEONESHOT); 1309133741Sjmg kn->kn_status = KN_INFLUX|KN_DETACHED; 131061962Sjlemon 1311133741Sjmg error = knote_attach(kn, kq); 1312133741Sjmg KQ_UNLOCK(kq); 1313133741Sjmg if (error != 0) { 1314133741Sjmg tkn = kn; 1315133741Sjmg goto done; 1316133741Sjmg } 1317133741Sjmg 1318133741Sjmg if ((error = kn->kn_fop->f_attach(kn)) != 0) { 131983366Sjulian knote_drop(kn, td); 132059290Sjlemon goto done; 132159290Sjlemon } 1322302235Skib knl = kn_list_lock(kn); 1323197240Ssson goto done_ev_add; 132461962Sjlemon } else { 1325197240Ssson /* No matching knote and the EV_ADD flag is not set. */ 1326133741Sjmg KQ_UNLOCK(kq); 1327197240Ssson error = ENOENT; 1328197240Ssson goto done; 132959290Sjlemon } 1330197240Ssson } 1331197240Ssson 1332197240Ssson if (kev->flags & EV_DELETE) { 1333133741Sjmg kn->kn_status |= KN_INFLUX; 1334133741Sjmg KQ_UNLOCK(kq); 1335134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1336134859Sjmg kn->kn_fop->f_detach(kn); 133783366Sjulian knote_drop(kn, td); 133859290Sjlemon goto done; 133959290Sjlemon } 134059290Sjlemon 1341274560Sjmg if (kev->flags & EV_FORCEONESHOT) { 1342274560Sjmg kn->kn_flags |= EV_ONESHOT; 1343274560Sjmg KNOTE_ACTIVATE(kn, 1); 1344274560Sjmg } 1345274560Sjmg 1346197240Ssson /* 1347197240Ssson * The user may change some filter values after the initial EV_ADD, 1348197240Ssson * but doing so will not reset any filter which has already been 1349197240Ssson * triggered. 1350197240Ssson */ 1351264146Skib kn->kn_status |= KN_INFLUX | KN_SCAN; 1352197240Ssson KQ_UNLOCK(kq); 1353302235Skib knl = kn_list_lock(kn); 1354197240Ssson kn->kn_kevent.udata = kev->udata; 1355197240Ssson if (!fops->f_isfd && fops->f_touch != NULL) { 1356197240Ssson fops->f_touch(kn, kev, EVENT_REGISTER); 1357197240Ssson } else { 1358197240Ssson kn->kn_sfflags = kev->fflags; 1359197240Ssson kn->kn_sdata = kev->data; 1360197240Ssson } 1361197240Ssson 1362197240Ssson /* 1363197240Ssson * We can get here with kn->kn_knlist == NULL. This can happen when 1364197240Ssson * the initial attach event decides that the event is "completed" 1365197240Ssson * already. i.e. filt_procattach is called on a zombie process. It 1366197240Ssson * will call filt_proc which will remove it from the list, and NULL 1367197240Ssson * kn_knlist. 1368197240Ssson */ 1369197240Sssondone_ev_add: 1370295786Smarkj if ((kev->flags & EV_ENABLE) != 0) 1371295786Smarkj kn->kn_status &= ~KN_DISABLED; 1372295786Smarkj else if ((kev->flags & EV_DISABLE) != 0) 1373274560Sjmg kn->kn_status |= KN_DISABLED; 1374274560Sjmg 1375274560Sjmg if ((kn->kn_status & KN_DISABLED) == 0) 1376274560Sjmg event = kn->kn_fop->f_event(kn, 0); 1377274560Sjmg else 1378274560Sjmg event = 0; 1379295786Smarkj 1380197240Ssson KQ_LOCK(kq); 1381197240Ssson if (event) 1382295786Smarkj kn->kn_status |= KN_ACTIVE; 1383295786Smarkj if ((kn->kn_status & (KN_ACTIVE | KN_DISABLED | KN_QUEUED)) == 1384295786Smarkj KN_ACTIVE) 1385295786Smarkj knote_enqueue(kn); 1386264146Skib kn->kn_status &= ~(KN_INFLUX | KN_SCAN); 1387302235Skib kn_list_unlock(knl); 1388133741Sjmg KQ_UNLOCK_FLUX(kq); 138959290Sjlemon 139059290Sjlemondone: 1391133741Sjmg KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1392255798Skib if (filedesc_unlock) 1393255798Skib FILEDESC_XUNLOCK(td->td_proc->p_fd); 139468883Sdillon if (fp != NULL) 139583366Sjulian fdrop(fp, td); 1396287362Skib knote_free(tkn); 1397133741Sjmg if (fops != NULL) 1398133741Sjmg kqueue_fo_release(filt); 139959290Sjlemon return (error); 140059290Sjlemon} 140159290Sjlemon 140259290Sjlemonstatic int 1403170029Srwatsonkqueue_acquire(struct file *fp, struct kqueue **kqp) 140459290Sjlemon{ 1405133741Sjmg int error; 140689306Salfred struct kqueue *kq; 1407133741Sjmg 1408133741Sjmg error = 0; 1409133741Sjmg 1410174988Sjeff kq = fp->f_data; 1411174988Sjeff if (fp->f_type != DTYPE_KQUEUE || kq == NULL) 1412174988Sjeff return (EBADF); 1413174988Sjeff *kqp = kq; 1414174988Sjeff KQ_LOCK(kq); 1415174988Sjeff if ((kq->kq_state & KQ_CLOSING) == KQ_CLOSING) { 1416133741Sjmg KQ_UNLOCK(kq); 1417174988Sjeff return (EBADF); 1418174988Sjeff } 1419174988Sjeff kq->kq_refcnt++; 1420174988Sjeff KQ_UNLOCK(kq); 1421133741Sjmg 1422133741Sjmg return error; 1423133741Sjmg} 1424133741Sjmg 1425133741Sjmgstatic void 1426133741Sjmgkqueue_release(struct kqueue *kq, int locked) 1427133741Sjmg{ 1428133741Sjmg if (locked) 1429133741Sjmg KQ_OWNED(kq); 1430133741Sjmg else 1431133741Sjmg KQ_LOCK(kq); 1432133741Sjmg kq->kq_refcnt--; 1433133741Sjmg if (kq->kq_refcnt == 1) 1434133741Sjmg wakeup(&kq->kq_refcnt); 1435133741Sjmg if (!locked) 1436133741Sjmg KQ_UNLOCK(kq); 1437133741Sjmg} 1438133741Sjmg 1439133741Sjmgstatic void 1440133741Sjmgkqueue_schedtask(struct kqueue *kq) 1441133741Sjmg{ 1442133741Sjmg 1443133741Sjmg KQ_OWNED(kq); 1444133741Sjmg KASSERT(((kq->kq_state & KQ_TASKDRAIN) != KQ_TASKDRAIN), 1445133741Sjmg ("scheduling kqueue task while draining")); 1446133741Sjmg 1447133741Sjmg if ((kq->kq_state & KQ_TASKSCHED) != KQ_TASKSCHED) { 1448300627Skib taskqueue_enqueue(taskqueue_kqueue_ctx, &kq->kq_task); 1449133741Sjmg kq->kq_state |= KQ_TASKSCHED; 1450133741Sjmg } 1451133741Sjmg} 1452133741Sjmg 1453133741Sjmg/* 1454133741Sjmg * Expand the kq to make sure we have storage for fops/ident pair. 1455133741Sjmg * 1456133741Sjmg * Return 0 on success (or no work necessary), return errno on failure. 1457133741Sjmg * 1458133741Sjmg * Not calling hashinit w/ waitok (proper malloc flag) should be safe. 1459133741Sjmg * If kqueue_register is called from a non-fd context, there usually/should 1460133741Sjmg * be no locks held. 1461133741Sjmg */ 1462133741Sjmgstatic int 1463133741Sjmgkqueue_expand(struct kqueue *kq, struct filterops *fops, uintptr_t ident, 1464133741Sjmg int waitok) 1465133741Sjmg{ 1466205886Sjhb struct klist *list, *tmp_knhash, *to_free; 1467133741Sjmg u_long tmp_knhashmask; 1468133741Sjmg int size; 1469133741Sjmg int fd; 1470133741Sjmg int mflag = waitok ? M_WAITOK : M_NOWAIT; 1471133741Sjmg 1472133741Sjmg KQ_NOTOWNED(kq); 1473133741Sjmg 1474205886Sjhb to_free = NULL; 1475133741Sjmg if (fops->f_isfd) { 1476133741Sjmg fd = ident; 1477133741Sjmg if (kq->kq_knlistsize <= fd) { 1478133741Sjmg size = kq->kq_knlistsize; 1479133741Sjmg while (size <= fd) 1480133741Sjmg size += KQEXTENT; 1481197575Sdelphij list = malloc(size * sizeof(*list), M_KQUEUE, mflag); 1482133741Sjmg if (list == NULL) 1483133741Sjmg return ENOMEM; 1484133741Sjmg KQ_LOCK(kq); 1485133741Sjmg if (kq->kq_knlistsize > fd) { 1486205886Sjhb to_free = list; 1487133741Sjmg list = NULL; 1488133741Sjmg } else { 1489133741Sjmg if (kq->kq_knlist != NULL) { 1490133741Sjmg bcopy(kq->kq_knlist, list, 1491197575Sdelphij kq->kq_knlistsize * sizeof(*list)); 1492205886Sjhb to_free = kq->kq_knlist; 1493133741Sjmg kq->kq_knlist = NULL; 1494133741Sjmg } 1495133741Sjmg bzero((caddr_t)list + 1496197575Sdelphij kq->kq_knlistsize * sizeof(*list), 1497197575Sdelphij (size - kq->kq_knlistsize) * sizeof(*list)); 1498133741Sjmg kq->kq_knlistsize = size; 1499133741Sjmg kq->kq_knlist = list; 1500133741Sjmg } 1501133741Sjmg KQ_UNLOCK(kq); 1502133741Sjmg } 1503133741Sjmg } else { 1504133741Sjmg if (kq->kq_knhashmask == 0) { 1505133741Sjmg tmp_knhash = hashinit(KN_HASHSIZE, M_KQUEUE, 1506133741Sjmg &tmp_knhashmask); 1507133741Sjmg if (tmp_knhash == NULL) 1508133741Sjmg return ENOMEM; 1509133741Sjmg KQ_LOCK(kq); 1510133741Sjmg if (kq->kq_knhashmask == 0) { 1511133741Sjmg kq->kq_knhash = tmp_knhash; 1512133741Sjmg kq->kq_knhashmask = tmp_knhashmask; 1513133741Sjmg } else { 1514205886Sjhb to_free = tmp_knhash; 1515133741Sjmg } 1516133741Sjmg KQ_UNLOCK(kq); 1517133741Sjmg } 1518133741Sjmg } 1519205886Sjhb free(to_free, M_KQUEUE); 1520133741Sjmg 1521133741Sjmg KQ_NOTOWNED(kq); 1522133741Sjmg return 0; 1523133741Sjmg} 1524133741Sjmg 1525133741Sjmgstatic void 1526133741Sjmgkqueue_task(void *arg, int pending) 1527133741Sjmg{ 1528133741Sjmg struct kqueue *kq; 1529133741Sjmg int haskqglobal; 1530133741Sjmg 1531133741Sjmg haskqglobal = 0; 1532133741Sjmg kq = arg; 1533133741Sjmg 1534133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1535133741Sjmg KQ_LOCK(kq); 1536133741Sjmg 1537133741Sjmg KNOTE_LOCKED(&kq->kq_sel.si_note, 0); 1538133741Sjmg 1539133741Sjmg kq->kq_state &= ~KQ_TASKSCHED; 1540133741Sjmg if ((kq->kq_state & KQ_TASKDRAIN) == KQ_TASKDRAIN) { 1541133741Sjmg wakeup(&kq->kq_state); 1542133741Sjmg } 1543133741Sjmg KQ_UNLOCK(kq); 1544133741Sjmg KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1545133741Sjmg} 1546133741Sjmg 1547133741Sjmg/* 1548133741Sjmg * Scan, update kn_data (if not ONESHOT), and copyout triggered events. 1549133741Sjmg * We treat KN_MARKER knotes as if they are INFLUX. 1550133741Sjmg */ 1551133741Sjmgstatic int 1552146950Spskqueue_scan(struct kqueue *kq, int maxevents, struct kevent_copyops *k_ops, 1553146950Sps const struct timespec *tsp, struct kevent *keva, struct thread *td) 1554133741Sjmg{ 155559290Sjlemon struct kevent *kevp; 1556133794Sgreen struct knote *kn, *marker; 1557302235Skib struct knlist *knl; 1558247804Sdavide sbintime_t asbt, rsbt; 1559247804Sdavide int count, error, haskqglobal, influx, nkev, touch; 156059290Sjlemon 156159290Sjlemon count = maxevents; 1562133741Sjmg nkev = 0; 1563133741Sjmg error = 0; 1564133741Sjmg haskqglobal = 0; 156559290Sjlemon 1566133741Sjmg if (maxevents == 0) 1567133741Sjmg goto done_nl; 1568133741Sjmg 1569247804Sdavide rsbt = 0; 157064343Sjlemon if (tsp != NULL) { 1571247804Sdavide if (tsp->tv_sec < 0 || tsp->tv_nsec < 0 || 1572247917Smav tsp->tv_nsec >= 1000000000) { 157359290Sjlemon error = EINVAL; 1574133741Sjmg goto done_nl; 157559290Sjlemon } 1576247804Sdavide if (timespecisset(tsp)) { 1577248092Smav if (tsp->tv_sec <= INT32_MAX) { 1578247898Smav rsbt = tstosbt(*tsp); 1579247898Smav if (TIMESEL(&asbt, rsbt)) 1580247898Smav asbt += tc_tick_sbt; 1581264388Sdavide if (asbt <= SBT_MAX - rsbt) 1582248092Smav asbt += rsbt; 1583248092Smav else 1584247898Smav asbt = 0; 1585247898Smav rsbt >>= tc_precexp; 1586247898Smav } else 1587247898Smav asbt = 0; 1588247804Sdavide } else 1589247804Sdavide asbt = -1; 1590247804Sdavide } else 1591247804Sdavide asbt = 0; 1592133794Sgreen marker = knote_alloc(1); 1593133794Sgreen marker->kn_status = KN_MARKER; 1594133741Sjmg KQ_LOCK(kq); 159559290Sjlemon 159659290Sjlemonretry: 1597133741Sjmg kevp = keva; 159859290Sjlemon if (kq->kq_count == 0) { 1599247804Sdavide if (asbt == -1) { 160064343Sjlemon error = EWOULDBLOCK; 160164343Sjlemon } else { 160264343Sjlemon kq->kq_state |= KQ_SLEEP; 1603247804Sdavide error = msleep_sbt(kq, &kq->kq_lock, PSOCK | PCATCH, 1604247804Sdavide "kqread", asbt, rsbt, C_ABSOLUTE); 160564343Sjlemon } 160664084Sjlemon if (error == 0) 160759290Sjlemon goto retry; 160864084Sjlemon /* don't restart after signals... */ 160964084Sjlemon if (error == ERESTART) 161064084Sjlemon error = EINTR; 161164084Sjlemon else if (error == EWOULDBLOCK) 161259290Sjlemon error = 0; 161359290Sjlemon goto done; 161459290Sjlemon } 161559290Sjlemon 1616133794Sgreen TAILQ_INSERT_TAIL(&kq->kq_head, marker, kn_tqe); 1617178914Skib influx = 0; 161859290Sjlemon while (count) { 1619133741Sjmg KQ_OWNED(kq); 162059290Sjlemon kn = TAILQ_FIRST(&kq->kq_head); 1621133741Sjmg 1622133794Sgreen if ((kn->kn_status == KN_MARKER && kn != marker) || 1623133741Sjmg (kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1624178914Skib if (influx) { 1625178914Skib influx = 0; 1626178914Skib KQ_FLUX_WAKEUP(kq); 1627178914Skib } 1628180336Skib kq->kq_state |= KQ_FLUXWAIT; 1629133741Sjmg error = msleep(kq, &kq->kq_lock, PSOCK, 1630133741Sjmg "kqflxwt", 0); 1631133741Sjmg continue; 1632133741Sjmg } 1633133741Sjmg 1634133590Srwatson TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); 1635133741Sjmg if ((kn->kn_status & KN_DISABLED) == KN_DISABLED) { 1636133741Sjmg kn->kn_status &= ~KN_QUEUED; 1637133741Sjmg kq->kq_count--; 1638133741Sjmg continue; 1639133741Sjmg } 1640133794Sgreen if (kn == marker) { 1641133741Sjmg KQ_FLUX_WAKEUP(kq); 164259290Sjlemon if (count == maxevents) 164359290Sjlemon goto retry; 164459290Sjlemon goto done; 164559290Sjlemon } 1646133741Sjmg KASSERT((kn->kn_status & KN_INFLUX) == 0, 1647133741Sjmg ("KN_INFLUX set when not suppose to be")); 1648133741Sjmg 1649254072Sjhb if ((kn->kn_flags & EV_DROP) == EV_DROP) { 165059290Sjlemon kn->kn_status &= ~KN_QUEUED; 1651133741Sjmg kn->kn_status |= KN_INFLUX; 165259290Sjlemon kq->kq_count--; 1653133741Sjmg KQ_UNLOCK(kq); 1654133741Sjmg /* 1655133741Sjmg * We don't need to lock the list since we've marked 1656133741Sjmg * it _INFLUX. 1657133741Sjmg */ 1658254072Sjhb if (!(kn->kn_status & KN_DETACHED)) 1659254072Sjhb kn->kn_fop->f_detach(kn); 1660254072Sjhb knote_drop(kn, td); 1661254072Sjhb KQ_LOCK(kq); 1662254072Sjhb continue; 1663254072Sjhb } else if ((kn->kn_flags & EV_ONESHOT) == EV_ONESHOT) { 1664254072Sjhb kn->kn_status &= ~KN_QUEUED; 1665254072Sjhb kn->kn_status |= KN_INFLUX; 1666254072Sjhb kq->kq_count--; 1667254072Sjhb KQ_UNLOCK(kq); 1668254072Sjhb /* 1669254072Sjhb * We don't need to lock the list since we've marked 1670254072Sjhb * it _INFLUX. 1671254072Sjhb */ 1672133741Sjmg *kevp = kn->kn_kevent; 1673134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1674134859Sjmg kn->kn_fop->f_detach(kn); 167583366Sjulian knote_drop(kn, td); 1676133741Sjmg KQ_LOCK(kq); 1677133741Sjmg kn = NULL; 167859290Sjlemon } else { 1679264146Skib kn->kn_status |= KN_INFLUX | KN_SCAN; 1680133741Sjmg KQ_UNLOCK(kq); 1681133741Sjmg if ((kn->kn_status & KN_KQUEUE) == KN_KQUEUE) 1682133741Sjmg KQ_GLOBAL_LOCK(&kq_global, haskqglobal); 1683302235Skib knl = kn_list_lock(kn); 1684133741Sjmg if (kn->kn_fop->f_event(kn, 0) == 0) { 1685133741Sjmg KQ_LOCK(kq); 1686157754Sjhb KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1687133741Sjmg kn->kn_status &= 1688264146Skib ~(KN_QUEUED | KN_ACTIVE | KN_INFLUX | 1689264146Skib KN_SCAN); 1690133741Sjmg kq->kq_count--; 1691302235Skib kn_list_unlock(knl); 1692178914Skib influx = 1; 1693133741Sjmg continue; 1694133741Sjmg } 1695197240Ssson touch = (!kn->kn_fop->f_isfd && 1696197240Ssson kn->kn_fop->f_touch != NULL); 1697197240Ssson if (touch) 1698197240Ssson kn->kn_fop->f_touch(kn, kevp, EVENT_PROCESS); 1699197240Ssson else 1700197240Ssson *kevp = kn->kn_kevent; 1701133741Sjmg KQ_LOCK(kq); 1702157754Sjhb KQ_GLOBAL_UNLOCK(&kq_global, haskqglobal); 1703254932Sjmg if (kn->kn_flags & (EV_CLEAR | EV_DISPATCH)) { 1704197240Ssson /* 1705197240Ssson * Manually clear knotes who weren't 1706197240Ssson * 'touch'ed. 1707197240Ssson */ 1708197242Ssson if (touch == 0 && kn->kn_flags & EV_CLEAR) { 1709197240Ssson kn->kn_data = 0; 1710197240Ssson kn->kn_fflags = 0; 1711197240Ssson } 1712197242Ssson if (kn->kn_flags & EV_DISPATCH) 1713197242Ssson kn->kn_status |= KN_DISABLED; 1714133741Sjmg kn->kn_status &= ~(KN_QUEUED | KN_ACTIVE); 1715133741Sjmg kq->kq_count--; 1716133741Sjmg } else 1717133741Sjmg TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); 1718150199Sups 1719264146Skib kn->kn_status &= ~(KN_INFLUX | KN_SCAN); 1720302235Skib kn_list_unlock(knl); 1721178914Skib influx = 1; 172259290Sjlemon } 1723133741Sjmg 1724133741Sjmg /* we are returning a copy to the user */ 1725133741Sjmg kevp++; 1726133741Sjmg nkev++; 172759290Sjlemon count--; 1728133741Sjmg 172959290Sjlemon if (nkev == KQ_NEVENTS) { 1730178914Skib influx = 0; 1731133741Sjmg KQ_UNLOCK_FLUX(kq); 1732146950Sps error = k_ops->k_copyout(k_ops->arg, keva, nkev); 173359290Sjlemon nkev = 0; 1734133741Sjmg kevp = keva; 1735133741Sjmg KQ_LOCK(kq); 173659997Sjlemon if (error) 173759997Sjlemon break; 173859290Sjlemon } 173959290Sjlemon } 1740133794Sgreen TAILQ_REMOVE(&kq->kq_head, marker, kn_tqe); 174159290Sjlemondone: 1742133741Sjmg KQ_OWNED(kq); 1743133741Sjmg KQ_UNLOCK_FLUX(kq); 1744133794Sgreen knote_free(marker); 1745133741Sjmgdone_nl: 1746133741Sjmg KQ_NOTOWNED(kq); 174759290Sjlemon if (nkev != 0) 1748146950Sps error = k_ops->k_copyout(k_ops->arg, keva, nkev); 1749133741Sjmg td->td_retval[0] = maxevents - count; 175059290Sjlemon return (error); 175159290Sjlemon} 175259290Sjlemon 175359290Sjlemon/*ARGSUSED*/ 1754255675Srdivackystatic int 1755132138Salfredkqueue_ioctl(struct file *fp, u_long cmd, void *data, 1756102003Srwatson struct ucred *active_cred, struct thread *td) 175759290Sjlemon{ 1758132174Salfred /* 1759132174Salfred * Enabling sigio causes two major problems: 1760132174Salfred * 1) infinite recursion: 1761132174Salfred * Synopsys: kevent is being used to track signals and have FIOASYNC 1762132174Salfred * set. On receipt of a signal this will cause a kqueue to recurse 1763132174Salfred * into itself over and over. Sending the sigio causes the kqueue 1764132174Salfred * to become ready, which in turn posts sigio again, forever. 1765132174Salfred * Solution: this can be solved by setting a flag in the kqueue that 1766132174Salfred * we have a SIGIO in progress. 1767132174Salfred * 2) locking problems: 1768132174Salfred * Synopsys: Kqueue is a leaf subsystem, but adding signalling puts 1769132174Salfred * us above the proc and pgrp locks. 1770132174Salfred * Solution: Post a signal using an async mechanism, being sure to 1771132174Salfred * record a generation count in the delivery so that we do not deliver 1772132174Salfred * a signal to the wrong process. 1773132174Salfred * 1774132174Salfred * Note, these two mechanisms are somewhat mutually exclusive! 1775132174Salfred */ 1776132174Salfred#if 0 1777132138Salfred struct kqueue *kq; 1778132138Salfred 1779132138Salfred kq = fp->f_data; 1780132138Salfred switch (cmd) { 1781132138Salfred case FIOASYNC: 1782132138Salfred if (*(int *)data) { 1783132138Salfred kq->kq_state |= KQ_ASYNC; 1784132138Salfred } else { 1785132138Salfred kq->kq_state &= ~KQ_ASYNC; 1786132138Salfred } 1787132138Salfred return (0); 1788132138Salfred 1789132138Salfred case FIOSETOWN: 1790132138Salfred return (fsetown(*(int *)data, &kq->kq_sigio)); 1791132138Salfred 1792132138Salfred case FIOGETOWN: 1793132138Salfred *(int *)data = fgetown(&kq->kq_sigio); 1794132138Salfred return (0); 1795132138Salfred } 1796132174Salfred#endif 1797132138Salfred 179859290Sjlemon return (ENOTTY); 179959290Sjlemon} 180059290Sjlemon 180159290Sjlemon/*ARGSUSED*/ 1802255675Srdivackystatic int 1803101983Srwatsonkqueue_poll(struct file *fp, int events, struct ucred *active_cred, 1804101987Srwatson struct thread *td) 180559290Sjlemon{ 180689306Salfred struct kqueue *kq; 180759290Sjlemon int revents = 0; 1808133741Sjmg int error; 180959290Sjlemon 1810170029Srwatson if ((error = kqueue_acquire(fp, &kq))) 1811133741Sjmg return POLLERR; 1812133741Sjmg 1813133741Sjmg KQ_LOCK(kq); 1814133741Sjmg if (events & (POLLIN | POLLRDNORM)) { 1815133741Sjmg if (kq->kq_count) { 1816133741Sjmg revents |= events & (POLLIN | POLLRDNORM); 181759290Sjlemon } else { 1818133741Sjmg selrecord(td, &kq->kq_sel); 1819174647Sjeff if (SEL_WAITING(&kq->kq_sel)) 1820174647Sjeff kq->kq_state |= KQ_SEL; 182159290Sjlemon } 182259290Sjlemon } 1823133741Sjmg kqueue_release(kq, 1); 1824133741Sjmg KQ_UNLOCK(kq); 182559290Sjlemon return (revents); 182659290Sjlemon} 182759290Sjlemon 182859290Sjlemon/*ARGSUSED*/ 1829255675Srdivackystatic int 1830101983Srwatsonkqueue_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 1831101987Srwatson struct thread *td) 183259290Sjlemon{ 183359290Sjlemon 1834146603Sjmg bzero((void *)st, sizeof *st); 1835146603Sjmg /* 1836146603Sjmg * We no longer return kq_count because the unlocked value is useless. 1837146603Sjmg * If you spent all this time getting the count, why not spend your 1838146603Sjmg * syscall better by calling kevent? 1839146603Sjmg * 1840146603Sjmg * XXX - This is needed for libc_r. 1841146603Sjmg */ 1842146603Sjmg st->st_mode = S_IFIFO; 1843146603Sjmg return (0); 184459290Sjlemon} 184559290Sjlemon 1846286631Sedstatic void 1847286631Sedkqueue_drain(struct kqueue *kq, struct thread *td) 184859290Sjlemon{ 1849133741Sjmg struct knote *kn; 185059290Sjlemon int i; 185159290Sjlemon 1852133741Sjmg KQ_LOCK(kq); 1853133741Sjmg 1854133741Sjmg KASSERT((kq->kq_state & KQ_CLOSING) != KQ_CLOSING, 1855133741Sjmg ("kqueue already closing")); 1856133741Sjmg kq->kq_state |= KQ_CLOSING; 1857133741Sjmg if (kq->kq_refcnt > 1) 1858133741Sjmg msleep(&kq->kq_refcnt, &kq->kq_lock, PSOCK, "kqclose", 0); 1859133741Sjmg 1860133741Sjmg KASSERT(kq->kq_refcnt == 1, ("other refs are out there!")); 1861133741Sjmg 1862133741Sjmg KASSERT(knlist_empty(&kq->kq_sel.si_note), 1863133741Sjmg ("kqueue's knlist not empty")); 1864133741Sjmg 1865133741Sjmg for (i = 0; i < kq->kq_knlistsize; i++) { 1866133741Sjmg while ((kn = SLIST_FIRST(&kq->kq_knlist[i])) != NULL) { 1867178913Skib if ((kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1868178913Skib kq->kq_state |= KQ_FLUXWAIT; 1869178913Skib msleep(kq, &kq->kq_lock, PSOCK, "kqclo1", 0); 1870178913Skib continue; 1871178913Skib } 1872133741Sjmg kn->kn_status |= KN_INFLUX; 1873133741Sjmg KQ_UNLOCK(kq); 1874134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1875134859Sjmg kn->kn_fop->f_detach(kn); 1876133741Sjmg knote_drop(kn, td); 1877133741Sjmg KQ_LOCK(kq); 187859290Sjlemon } 187959290Sjlemon } 1880133741Sjmg if (kq->kq_knhashmask != 0) { 1881133741Sjmg for (i = 0; i <= kq->kq_knhashmask; i++) { 1882133741Sjmg while ((kn = SLIST_FIRST(&kq->kq_knhash[i])) != NULL) { 1883178913Skib if ((kn->kn_status & KN_INFLUX) == KN_INFLUX) { 1884178913Skib kq->kq_state |= KQ_FLUXWAIT; 1885178913Skib msleep(kq, &kq->kq_lock, PSOCK, 1886178913Skib "kqclo2", 0); 1887178913Skib continue; 1888178913Skib } 1889133741Sjmg kn->kn_status |= KN_INFLUX; 1890133741Sjmg KQ_UNLOCK(kq); 1891134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 1892134859Sjmg kn->kn_fop->f_detach(kn); 1893133741Sjmg knote_drop(kn, td); 1894133741Sjmg KQ_LOCK(kq); 189559290Sjlemon } 189659290Sjlemon } 189759290Sjlemon } 1898133741Sjmg 1899133741Sjmg if ((kq->kq_state & KQ_TASKSCHED) == KQ_TASKSCHED) { 1900133741Sjmg kq->kq_state |= KQ_TASKDRAIN; 1901133741Sjmg msleep(&kq->kq_state, &kq->kq_lock, PSOCK, "kqtqdr", 0); 1902133741Sjmg } 1903133741Sjmg 1904133741Sjmg if ((kq->kq_state & KQ_SEL) == KQ_SEL) { 1905126033Sgreen selwakeuppri(&kq->kq_sel, PSOCK); 1906174647Sjeff if (!SEL_WAITING(&kq->kq_sel)) 1907174647Sjeff kq->kq_state &= ~KQ_SEL; 1908126033Sgreen } 1909133741Sjmg 1910133741Sjmg KQ_UNLOCK(kq); 1911286631Sed} 1912133741Sjmg 1913286631Sedstatic void 1914286631Sedkqueue_destroy(struct kqueue *kq) 1915286631Sed{ 1916286631Sed 1917286681Sed KASSERT(kq->kq_fdp == NULL, 1918286681Sed ("kqueue still attached to a file descriptor")); 1919286631Sed seldrain(&kq->kq_sel); 1920286631Sed knlist_destroy(&kq->kq_sel.si_note); 1921286631Sed mtx_destroy(&kq->kq_lock); 1922286631Sed 1923286631Sed if (kq->kq_knhash != NULL) 1924286631Sed free(kq->kq_knhash, M_KQUEUE); 1925286631Sed if (kq->kq_knlist != NULL) 1926286631Sed free(kq->kq_knlist, M_KQUEUE); 1927286631Sed 1928286631Sed funsetown(&kq->kq_sigio); 1929286631Sed} 1930286631Sed 1931286631Sed/*ARGSUSED*/ 1932286631Sedstatic int 1933286631Sedkqueue_close(struct file *fp, struct thread *td) 1934286631Sed{ 1935286631Sed struct kqueue *kq = fp->f_data; 1936286631Sed struct filedesc *fdp; 1937286631Sed int error; 1938286631Sed int filedesc_unlock; 1939286631Sed 1940286631Sed if ((error = kqueue_acquire(fp, &kq))) 1941286631Sed return error; 1942286631Sed kqueue_drain(kq, td); 1943286631Sed 1944255798Skib /* 1945255798Skib * We could be called due to the knote_drop() doing fdrop(), 1946255798Skib * called from kqueue_register(). In this case the global 1947255798Skib * lock is owned, and filedesc sx is locked before, to not 1948255798Skib * take the sleepable lock after non-sleepable. 1949255798Skib */ 1950286631Sed fdp = kq->kq_fdp; 1951286681Sed kq->kq_fdp = NULL; 1952255798Skib if (!sx_xlocked(FILEDESC_LOCK(fdp))) { 1953255798Skib FILEDESC_XLOCK(fdp); 1954255798Skib filedesc_unlock = 1; 1955255798Skib } else 1956255798Skib filedesc_unlock = 0; 1957255527Skib TAILQ_REMOVE(&fdp->fd_kqlist, kq, kq_list); 1958255798Skib if (filedesc_unlock) 1959255798Skib FILEDESC_XUNLOCK(fdp); 1960133741Sjmg 1961286631Sed kqueue_destroy(kq); 1962256849Skib chgkqcnt(kq->kq_cred->cr_ruidinfo, -1, 0); 1963256849Skib crfree(kq->kq_cred); 196484138Sjlemon free(kq, M_KQUEUE); 1965109153Sdillon fp->f_data = NULL; 196659290Sjlemon 196759290Sjlemon return (0); 196859290Sjlemon} 196959290Sjlemon 1970271976Sjhbstatic int 1971271976Sjhbkqueue_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 1972271976Sjhb{ 1973271976Sjhb 1974271976Sjhb kif->kf_type = KF_TYPE_KQUEUE; 1975271976Sjhb return (0); 1976271976Sjhb} 1977271976Sjhb 197859290Sjlemonstatic void 197959290Sjlemonkqueue_wakeup(struct kqueue *kq) 198059290Sjlemon{ 1981133741Sjmg KQ_OWNED(kq); 198259290Sjlemon 1983133741Sjmg if ((kq->kq_state & KQ_SLEEP) == KQ_SLEEP) { 198459290Sjlemon kq->kq_state &= ~KQ_SLEEP; 198559290Sjlemon wakeup(kq); 198659290Sjlemon } 1987133741Sjmg if ((kq->kq_state & KQ_SEL) == KQ_SEL) { 1988122352Stanimura selwakeuppri(&kq->kq_sel, PSOCK); 1989174647Sjeff if (!SEL_WAITING(&kq->kq_sel)) 1990174647Sjeff kq->kq_state &= ~KQ_SEL; 199159290Sjlemon } 1992133741Sjmg if (!knlist_empty(&kq->kq_sel.si_note)) 1993133741Sjmg kqueue_schedtask(kq); 1994133741Sjmg if ((kq->kq_state & KQ_ASYNC) == KQ_ASYNC) { 1995132138Salfred pgsigio(&kq->kq_sigio, SIGIO, 0); 1996132138Salfred } 199759290Sjlemon} 199859290Sjlemon 199959290Sjlemon/* 2000133741Sjmg * Walk down a list of knotes, activating them if their event has triggered. 2001133741Sjmg * 2002133741Sjmg * There is a possibility to optimize in the case of one kq watching another. 2003133741Sjmg * Instead of scheduling a task to wake it up, you could pass enough state 2004133741Sjmg * down the chain to make up the parent kqueue. Make this code functional 2005133741Sjmg * first. 200659290Sjlemon */ 200759290Sjlemonvoid 2008195148Sstasknote(struct knlist *list, long hint, int lockflags) 200959290Sjlemon{ 2010133741Sjmg struct kqueue *kq; 2011287366Skib struct knote *kn, *tkn; 2012195148Sstas int error; 2013310578Skib bool own_influx; 201459290Sjlemon 2015133741Sjmg if (list == NULL) 2016133741Sjmg return; 2017133741Sjmg 2018195148Sstas KNL_ASSERT_LOCK(list, lockflags & KNF_LISTLOCKED); 2019147730Sssouhlal 2020195148Sstas if ((lockflags & KNF_LISTLOCKED) == 0) 2021147730Sssouhlal list->kl_lock(list->kl_lockarg); 2022147730Sssouhlal 2023133741Sjmg /* 2024287366Skib * If we unlock the list lock (and set KN_INFLUX), we can 2025287366Skib * eliminate the kqueue scheduling, but this will introduce 2026287366Skib * four lock/unlock's for each knote to test. Also, marker 2027287366Skib * would be needed to keep iteration position, since filters 2028287366Skib * or other threads could remove events. 2029133741Sjmg */ 2030287366Skib SLIST_FOREACH_SAFE(kn, &list->kl_list, kn_selnext, tkn) { 2031133741Sjmg kq = kn->kn_kq; 2032264146Skib KQ_LOCK(kq); 2033264146Skib if ((kn->kn_status & (KN_INFLUX | KN_SCAN)) == KN_INFLUX) { 2034264146Skib /* 2035264146Skib * Do not process the influx notes, except for 2036264146Skib * the influx coming from the kq unlock in the 2037264146Skib * kqueue_scan(). In the later case, we do 2038264146Skib * not interfere with the scan, since the code 2039264146Skib * fragment in kqueue_scan() locks the knlist, 2040264146Skib * and cannot proceed until we finished. 2041264146Skib */ 2042264146Skib KQ_UNLOCK(kq); 2043264146Skib } else if ((lockflags & KNF_NOKQLOCK) != 0) { 2044310578Skib own_influx = (kn->kn_status & KN_INFLUX) == 0; 2045310578Skib if (own_influx) 2046310578Skib kn->kn_status |= KN_INFLUX; 2047264146Skib KQ_UNLOCK(kq); 2048264146Skib error = kn->kn_fop->f_event(kn, hint); 2049133741Sjmg KQ_LOCK(kq); 2050310578Skib if (own_influx) 2051310578Skib kn->kn_status &= ~KN_INFLUX; 2052264146Skib if (error) 2053264146Skib KNOTE_ACTIVATE(kn, 1); 2054264146Skib KQ_UNLOCK_FLUX(kq); 2055264146Skib } else { 2056264146Skib kn->kn_status |= KN_HASKQLOCK; 2057264146Skib if (kn->kn_fop->f_event(kn, hint)) 2058264146Skib KNOTE_ACTIVATE(kn, 1); 2059264146Skib kn->kn_status &= ~KN_HASKQLOCK; 2060264146Skib KQ_UNLOCK(kq); 2061133741Sjmg } 2062133741Sjmg } 2063195148Sstas if ((lockflags & KNF_LISTLOCKED) == 0) 2064147730Sssouhlal list->kl_unlock(list->kl_lockarg); 206559290Sjlemon} 206659290Sjlemon 206759290Sjlemon/* 2068133741Sjmg * add a knote to a knlist 2069133741Sjmg */ 2070133741Sjmgvoid 2071133741Sjmgknlist_add(struct knlist *knl, struct knote *kn, int islocked) 2072133741Sjmg{ 2073147730Sssouhlal KNL_ASSERT_LOCK(knl, islocked); 2074133741Sjmg KQ_NOTOWNED(kn->kn_kq); 2075133741Sjmg KASSERT((kn->kn_status & (KN_INFLUX|KN_DETACHED)) == 2076133741Sjmg (KN_INFLUX|KN_DETACHED), ("knote not KN_INFLUX and KN_DETACHED")); 2077133741Sjmg if (!islocked) 2078147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 2079133741Sjmg SLIST_INSERT_HEAD(&knl->kl_list, kn, kn_selnext); 2080133741Sjmg if (!islocked) 2081147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2082133741Sjmg KQ_LOCK(kn->kn_kq); 2083133741Sjmg kn->kn_knlist = knl; 2084133741Sjmg kn->kn_status &= ~KN_DETACHED; 2085133741Sjmg KQ_UNLOCK(kn->kn_kq); 2086133741Sjmg} 2087133741Sjmg 2088133741Sjmgstatic void 2089302235Skibknlist_remove_kq(struct knlist *knl, struct knote *kn, int knlislocked, 2090302235Skib int kqislocked) 2091133741Sjmg{ 2092133741Sjmg KASSERT(!(!!kqislocked && !knlislocked), ("kq locked w/o knl locked")); 2093147730Sssouhlal KNL_ASSERT_LOCK(knl, knlislocked); 2094133741Sjmg mtx_assert(&kn->kn_kq->kq_lock, kqislocked ? MA_OWNED : MA_NOTOWNED); 2095133741Sjmg if (!kqislocked) 2096133741Sjmg KASSERT((kn->kn_status & (KN_INFLUX|KN_DETACHED)) == KN_INFLUX, 2097133741Sjmg ("knlist_remove called w/o knote being KN_INFLUX or already removed")); 2098133741Sjmg if (!knlislocked) 2099147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 2100133741Sjmg SLIST_REMOVE(&knl->kl_list, kn, knote, kn_selnext); 2101133741Sjmg kn->kn_knlist = NULL; 2102133741Sjmg if (!knlislocked) 2103302235Skib kn_list_unlock(knl); 2104133741Sjmg if (!kqislocked) 2105133741Sjmg KQ_LOCK(kn->kn_kq); 2106133741Sjmg kn->kn_status |= KN_DETACHED; 2107133741Sjmg if (!kqislocked) 2108133741Sjmg KQ_UNLOCK(kn->kn_kq); 2109133741Sjmg} 2110133741Sjmg 2111133741Sjmg/* 2112254932Sjmg * remove knote from the specified knlist 211359290Sjlemon */ 211459290Sjlemonvoid 2115133741Sjmgknlist_remove(struct knlist *knl, struct knote *kn, int islocked) 211659290Sjlemon{ 2117133741Sjmg 2118133741Sjmg knlist_remove_kq(knl, kn, islocked, 0); 2119133741Sjmg} 2120133741Sjmg 2121133741Sjmgint 2122133741Sjmgknlist_empty(struct knlist *knl) 2123133741Sjmg{ 2124233505Smelifaro 2125147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2126311046Skib return (SLIST_EMPTY(&knl->kl_list)); 2127133741Sjmg} 2128133741Sjmg 2129311046Skibstatic struct mtx knlist_lock; 2130133741SjmgMTX_SYSINIT(knlist_lock, &knlist_lock, "knlist lock for lockless objects", 2131311046Skib MTX_DEF); 2132147730Sssouhlalstatic void knlist_mtx_lock(void *arg); 2133147730Sssouhlalstatic void knlist_mtx_unlock(void *arg); 2134133741Sjmg 2135147730Sssouhlalstatic void 2136147730Sssouhlalknlist_mtx_lock(void *arg) 2137147730Sssouhlal{ 2138233505Smelifaro 2139147730Sssouhlal mtx_lock((struct mtx *)arg); 2140147730Sssouhlal} 2141147730Sssouhlal 2142147730Sssouhlalstatic void 2143147730Sssouhlalknlist_mtx_unlock(void *arg) 2144147730Sssouhlal{ 2145233505Smelifaro 2146147730Sssouhlal mtx_unlock((struct mtx *)arg); 2147147730Sssouhlal} 2148147730Sssouhlal 2149193951Skibstatic void 2150193951Skibknlist_mtx_assert_locked(void *arg) 2151147730Sssouhlal{ 2152233505Smelifaro 2153193951Skib mtx_assert((struct mtx *)arg, MA_OWNED); 2154147730Sssouhlal} 2155147730Sssouhlal 2156193951Skibstatic void 2157193951Skibknlist_mtx_assert_unlocked(void *arg) 2158193951Skib{ 2159233505Smelifaro 2160193951Skib mtx_assert((struct mtx *)arg, MA_NOTOWNED); 2161193951Skib} 2162193951Skib 2163233505Smelifarostatic void 2164233505Smelifaroknlist_rw_rlock(void *arg) 2165233505Smelifaro{ 2166233505Smelifaro 2167233505Smelifaro rw_rlock((struct rwlock *)arg); 2168233505Smelifaro} 2169233505Smelifaro 2170233505Smelifarostatic void 2171233505Smelifaroknlist_rw_runlock(void *arg) 2172233505Smelifaro{ 2173233505Smelifaro 2174233505Smelifaro rw_runlock((struct rwlock *)arg); 2175233505Smelifaro} 2176233505Smelifaro 2177233505Smelifarostatic void 2178233505Smelifaroknlist_rw_assert_locked(void *arg) 2179233505Smelifaro{ 2180233505Smelifaro 2181233505Smelifaro rw_assert((struct rwlock *)arg, RA_LOCKED); 2182233505Smelifaro} 2183233505Smelifaro 2184233505Smelifarostatic void 2185233505Smelifaroknlist_rw_assert_unlocked(void *arg) 2186233505Smelifaro{ 2187233505Smelifaro 2188233505Smelifaro rw_assert((struct rwlock *)arg, RA_UNLOCKED); 2189233505Smelifaro} 2190233505Smelifaro 2191133741Sjmgvoid 2192147730Sssouhlalknlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *), 2193193951Skib void (*kl_unlock)(void *), 2194193951Skib void (*kl_assert_locked)(void *), void (*kl_assert_unlocked)(void *)) 2195133741Sjmg{ 2196133741Sjmg 2197147730Sssouhlal if (lock == NULL) 2198147730Sssouhlal knl->kl_lockarg = &knlist_lock; 2199133741Sjmg else 2200147730Sssouhlal knl->kl_lockarg = lock; 2201133741Sjmg 2202147730Sssouhlal if (kl_lock == NULL) 2203147730Sssouhlal knl->kl_lock = knlist_mtx_lock; 2204147730Sssouhlal else 2205147730Sssouhlal knl->kl_lock = kl_lock; 2206157582Sjmg if (kl_unlock == NULL) 2207147730Sssouhlal knl->kl_unlock = knlist_mtx_unlock; 2208147730Sssouhlal else 2209147730Sssouhlal knl->kl_unlock = kl_unlock; 2210193951Skib if (kl_assert_locked == NULL) 2211193951Skib knl->kl_assert_locked = knlist_mtx_assert_locked; 2212147730Sssouhlal else 2213193951Skib knl->kl_assert_locked = kl_assert_locked; 2214193951Skib if (kl_assert_unlocked == NULL) 2215193951Skib knl->kl_assert_unlocked = knlist_mtx_assert_unlocked; 2216193951Skib else 2217193951Skib knl->kl_assert_unlocked = kl_assert_unlocked; 2218147730Sssouhlal 2219302242Skib knl->kl_autodestroy = 0; 2220133741Sjmg SLIST_INIT(&knl->kl_list); 2221133741Sjmg} 2222133741Sjmg 2223133741Sjmgvoid 2224193951Skibknlist_init_mtx(struct knlist *knl, struct mtx *lock) 2225193951Skib{ 2226193951Skib 2227193951Skib knlist_init(knl, lock, NULL, NULL, NULL, NULL); 2228193951Skib} 2229193951Skib 2230302235Skibstruct knlist * 2231302235Skibknlist_alloc(struct mtx *lock) 2232302235Skib{ 2233302235Skib struct knlist *knl; 2234302235Skib 2235302235Skib knl = malloc(sizeof(struct knlist), M_KQUEUE, M_WAITOK); 2236302235Skib knlist_init_mtx(knl, lock); 2237302235Skib return (knl); 2238302235Skib} 2239302235Skib 2240193951Skibvoid 2241233505Smelifaroknlist_init_rw_reader(struct knlist *knl, struct rwlock *lock) 2242233505Smelifaro{ 2243233505Smelifaro 2244233505Smelifaro knlist_init(knl, lock, knlist_rw_rlock, knlist_rw_runlock, 2245233505Smelifaro knlist_rw_assert_locked, knlist_rw_assert_unlocked); 2246233505Smelifaro} 2247233505Smelifaro 2248233505Smelifarovoid 2249133741Sjmgknlist_destroy(struct knlist *knl) 2250133741Sjmg{ 2251133741Sjmg 2252133741Sjmg#ifdef INVARIANTS 2253133741Sjmg /* 2254133741Sjmg * if we run across this error, we need to find the offending 2255254932Sjmg * driver and have it call knlist_clear or knlist_delete. 2256133741Sjmg */ 2257133741Sjmg if (!SLIST_EMPTY(&knl->kl_list)) 2258133741Sjmg printf("WARNING: destroying knlist w/ knotes on it!\n"); 2259133741Sjmg#endif 2260133741Sjmg 2261147730Sssouhlal knl->kl_lockarg = knl->kl_lock = knl->kl_unlock = NULL; 2262133741Sjmg SLIST_INIT(&knl->kl_list); 2263133741Sjmg} 2264133741Sjmg 2265302235Skibvoid 2266302235Skibknlist_detach(struct knlist *knl) 2267302235Skib{ 2268302235Skib 2269302235Skib KNL_ASSERT_LOCKED(knl); 2270302242Skib knl->kl_autodestroy = 1; 2271302235Skib if (knlist_empty(knl)) { 2272302235Skib knlist_destroy(knl); 2273302235Skib free(knl, M_KQUEUE); 2274302235Skib } 2275302235Skib} 2276302235Skib 2277133741Sjmg/* 2278133741Sjmg * Even if we are locked, we may need to drop the lock to allow any influx 2279133741Sjmg * knotes time to "settle". 2280133741Sjmg */ 2281133741Sjmgvoid 2282143776Sjmgknlist_cleardel(struct knlist *knl, struct thread *td, int islocked, int killkn) 2283133741Sjmg{ 2284159171Spjd struct knote *kn, *kn2; 2285133741Sjmg struct kqueue *kq; 228659290Sjlemon 2287302235Skib KASSERT(!knl->kl_autodestroy, ("cleardel for autodestroy %p", knl)); 2288133741Sjmg if (islocked) 2289147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2290133741Sjmg else { 2291147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); 2292170029Srwatsonagain: /* need to reacquire lock since we have dropped it */ 2293147730Sssouhlal knl->kl_lock(knl->kl_lockarg); 229459290Sjlemon } 2295133741Sjmg 2296159171Spjd SLIST_FOREACH_SAFE(kn, &knl->kl_list, kn_selnext, kn2) { 2297133741Sjmg kq = kn->kn_kq; 2298133741Sjmg KQ_LOCK(kq); 2299143776Sjmg if ((kn->kn_status & KN_INFLUX)) { 2300133741Sjmg KQ_UNLOCK(kq); 2301133741Sjmg continue; 2302133741Sjmg } 2303133741Sjmg knlist_remove_kq(knl, kn, 1, 1); 2304143776Sjmg if (killkn) { 2305143776Sjmg kn->kn_status |= KN_INFLUX | KN_DETACHED; 2306143776Sjmg KQ_UNLOCK(kq); 2307143776Sjmg knote_drop(kn, td); 2308143776Sjmg } else { 2309143776Sjmg /* Make sure cleared knotes disappear soon */ 2310143776Sjmg kn->kn_flags |= (EV_EOF | EV_ONESHOT); 2311143776Sjmg KQ_UNLOCK(kq); 2312143776Sjmg } 2313133741Sjmg kq = NULL; 2314133741Sjmg } 2315133741Sjmg 2316133741Sjmg if (!SLIST_EMPTY(&knl->kl_list)) { 2317133741Sjmg /* there are still KN_INFLUX remaining */ 2318133741Sjmg kn = SLIST_FIRST(&knl->kl_list); 2319133741Sjmg kq = kn->kn_kq; 2320133741Sjmg KQ_LOCK(kq); 2321133741Sjmg KASSERT(kn->kn_status & KN_INFLUX, 2322133741Sjmg ("knote removed w/o list lock")); 2323147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2324133741Sjmg kq->kq_state |= KQ_FLUXWAIT; 2325133741Sjmg msleep(kq, &kq->kq_lock, PSOCK | PDROP, "kqkclr", 0); 2326133741Sjmg kq = NULL; 2327133741Sjmg goto again; 2328133741Sjmg } 2329133741Sjmg 2330133741Sjmg if (islocked) 2331147730Sssouhlal KNL_ASSERT_LOCKED(knl); 2332133741Sjmg else { 2333147730Sssouhlal knl->kl_unlock(knl->kl_lockarg); 2334147730Sssouhlal KNL_ASSERT_UNLOCKED(knl); 2335133741Sjmg } 233659290Sjlemon} 233759290Sjlemon 233859290Sjlemon/* 2339168355Srwatson * Remove all knotes referencing a specified fd must be called with FILEDESC 2340168355Srwatson * lock. This prevents a race where a new fd comes along and occupies the 2341168355Srwatson * entry and we attach a knote to the fd. 234259290Sjlemon */ 234359290Sjlemonvoid 234483366Sjulianknote_fdclose(struct thread *td, int fd) 234559290Sjlemon{ 234683366Sjulian struct filedesc *fdp = td->td_proc->p_fd; 2347133741Sjmg struct kqueue *kq; 2348133741Sjmg struct knote *kn; 2349133741Sjmg int influx; 235059290Sjlemon 2351168355Srwatson FILEDESC_XLOCK_ASSERT(fdp); 2352133741Sjmg 2353133741Sjmg /* 2354133741Sjmg * We shouldn't have to worry about new kevents appearing on fd 2355133741Sjmg * since filedesc is locked. 2356133741Sjmg */ 2357255527Skib TAILQ_FOREACH(kq, &fdp->fd_kqlist, kq_list) { 2358133741Sjmg KQ_LOCK(kq); 2359133741Sjmg 2360133741Sjmgagain: 2361133741Sjmg influx = 0; 2362133741Sjmg while (kq->kq_knlistsize > fd && 2363133741Sjmg (kn = SLIST_FIRST(&kq->kq_knlist[fd])) != NULL) { 2364133741Sjmg if (kn->kn_status & KN_INFLUX) { 2365133741Sjmg /* someone else might be waiting on our knote */ 2366133741Sjmg if (influx) 2367133741Sjmg wakeup(kq); 2368133741Sjmg kq->kq_state |= KQ_FLUXWAIT; 2369133741Sjmg msleep(kq, &kq->kq_lock, PSOCK, "kqflxwt", 0); 2370133741Sjmg goto again; 2371133741Sjmg } 2372133741Sjmg kn->kn_status |= KN_INFLUX; 2373133741Sjmg KQ_UNLOCK(kq); 2374134859Sjmg if (!(kn->kn_status & KN_DETACHED)) 2375134859Sjmg kn->kn_fop->f_detach(kn); 2376133741Sjmg knote_drop(kn, td); 2377133741Sjmg influx = 1; 2378133741Sjmg KQ_LOCK(kq); 2379133741Sjmg } 2380133741Sjmg KQ_UNLOCK_FLUX(kq); 2381133741Sjmg } 238259290Sjlemon} 238359290Sjlemon 2384133741Sjmgstatic int 2385133741Sjmgknote_attach(struct knote *kn, struct kqueue *kq) 238659290Sjlemon{ 2387133741Sjmg struct klist *list; 238859290Sjlemon 2389133741Sjmg KASSERT(kn->kn_status & KN_INFLUX, ("knote not marked INFLUX")); 2390133741Sjmg KQ_OWNED(kq); 239189306Salfred 2392133741Sjmg if (kn->kn_fop->f_isfd) { 2393133741Sjmg if (kn->kn_id >= kq->kq_knlistsize) 2394311046Skib return (ENOMEM); 2395133741Sjmg list = &kq->kq_knlist[kn->kn_id]; 2396133741Sjmg } else { 2397133741Sjmg if (kq->kq_knhash == NULL) 2398311046Skib return (ENOMEM); 2399133741Sjmg list = &kq->kq_knhash[KN_HASH(kn->kn_id, kq->kq_knhashmask)]; 240059290Sjlemon } 240159290Sjlemon SLIST_INSERT_HEAD(list, kn, kn_link); 2402311046Skib return (0); 240359290Sjlemon} 240459290Sjlemon 240559290Sjlemon/* 2406151260Sambrisko * knote must already have been detached using the f_detach method. 2407133741Sjmg * no lock need to be held, it is assumed that the KN_INFLUX flag is set 2408133741Sjmg * to prevent other removal. 240959290Sjlemon */ 241059290Sjlemonstatic void 241183366Sjulianknote_drop(struct knote *kn, struct thread *td) 241259290Sjlemon{ 2413133741Sjmg struct kqueue *kq; 241459290Sjlemon struct klist *list; 241559290Sjlemon 2416133741Sjmg kq = kn->kn_kq; 2417133741Sjmg 2418133741Sjmg KQ_NOTOWNED(kq); 2419133741Sjmg KASSERT((kn->kn_status & KN_INFLUX) == KN_INFLUX, 2420133741Sjmg ("knote_drop called without KN_INFLUX set in kn_status")); 2421133741Sjmg 2422133741Sjmg KQ_LOCK(kq); 242359290Sjlemon if (kn->kn_fop->f_isfd) 2424133741Sjmg list = &kq->kq_knlist[kn->kn_id]; 242559290Sjlemon else 2426133741Sjmg list = &kq->kq_knhash[KN_HASH(kn->kn_id, kq->kq_knhashmask)]; 242759290Sjlemon 2428151260Sambrisko if (!SLIST_EMPTY(list)) 2429151260Sambrisko SLIST_REMOVE(list, kn, knote, kn_link); 243059290Sjlemon if (kn->kn_status & KN_QUEUED) 243159290Sjlemon knote_dequeue(kn); 2432133741Sjmg KQ_UNLOCK_FLUX(kq); 2433133741Sjmg 2434133741Sjmg if (kn->kn_fop->f_isfd) { 2435133741Sjmg fdrop(kn->kn_fp, td); 2436133741Sjmg kn->kn_fp = NULL; 2437133741Sjmg } 2438133741Sjmg kqueue_fo_release(kn->kn_kevent.filter); 2439133741Sjmg kn->kn_fop = NULL; 244059290Sjlemon knote_free(kn); 244159290Sjlemon} 244259290Sjlemon 244359290Sjlemonstatic void 244459290Sjlemonknote_enqueue(struct knote *kn) 244559290Sjlemon{ 244659290Sjlemon struct kqueue *kq = kn->kn_kq; 244759290Sjlemon 2448133741Sjmg KQ_OWNED(kn->kn_kq); 244959997Sjlemon KASSERT((kn->kn_status & KN_QUEUED) == 0, ("knote already queued")); 245059997Sjlemon 2451133590Srwatson TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe); 245259290Sjlemon kn->kn_status |= KN_QUEUED; 245359290Sjlemon kq->kq_count++; 245459290Sjlemon kqueue_wakeup(kq); 245559290Sjlemon} 245659290Sjlemon 245759290Sjlemonstatic void 245859290Sjlemonknote_dequeue(struct knote *kn) 245959290Sjlemon{ 246059290Sjlemon struct kqueue *kq = kn->kn_kq; 246159290Sjlemon 2462133741Sjmg KQ_OWNED(kn->kn_kq); 246359997Sjlemon KASSERT(kn->kn_status & KN_QUEUED, ("knote not queued")); 246459997Sjlemon 2465133590Srwatson TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe); 246659290Sjlemon kn->kn_status &= ~KN_QUEUED; 246759290Sjlemon kq->kq_count--; 246859290Sjlemon} 246959290Sjlemon 247059290Sjlemonstatic void 247159290Sjlemonknote_init(void) 247259290Sjlemon{ 2473133741Sjmg 247492751Sjeff knote_zone = uma_zcreate("KNOTE", sizeof(struct knote), NULL, NULL, 247592751Sjeff NULL, NULL, UMA_ALIGN_PTR, 0); 247659290Sjlemon} 2477177253SrwatsonSYSINIT(knote, SI_SUB_PSEUDO, SI_ORDER_ANY, knote_init, NULL); 247859290Sjlemon 247959290Sjlemonstatic struct knote * 2480133741Sjmgknote_alloc(int waitok) 248159290Sjlemon{ 2482287362Skib 2483287362Skib return (uma_zalloc(knote_zone, (waitok ? M_WAITOK : M_NOWAIT) | 2484287362Skib M_ZERO)); 248559290Sjlemon} 248659290Sjlemon 248759290Sjlemonstatic void 248859290Sjlemonknote_free(struct knote *kn) 248959290Sjlemon{ 2490287362Skib 2491287362Skib uma_zfree(knote_zone, kn); 249259290Sjlemon} 2493162594Sjmg 2494162594Sjmg/* 2495162594Sjmg * Register the kev w/ the kq specified by fd. 2496162594Sjmg */ 2497162594Sjmgint 2498162594Sjmgkqfd_register(int fd, struct kevent *kev, struct thread *td, int waitok) 2499162594Sjmg{ 2500162594Sjmg struct kqueue *kq; 2501162594Sjmg struct file *fp; 2502255219Spjd cap_rights_t rights; 2503162594Sjmg int error; 2504162594Sjmg 2505258181Spjd error = fget(td, fd, cap_rights_init(&rights, CAP_KQUEUE_CHANGE), &fp); 2506255219Spjd if (error != 0) 2507162594Sjmg return (error); 2508170029Srwatson if ((error = kqueue_acquire(fp, &kq)) != 0) 2509170029Srwatson goto noacquire; 2510162594Sjmg 2511162594Sjmg error = kqueue_register(kq, kev, td, waitok); 2512162594Sjmg kqueue_release(kq, 0); 2513162594Sjmg 2514170029Srwatsonnoacquire: 2515162608Sjmg fdrop(fp, td); 2516311046Skib return (error); 2517162594Sjmg} 2518