The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/event.h

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    1 /*-
    2  * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.1/sys/sys/event.h 264368 2014-04-12 14:08:53Z kib $
   27  */
   28 
   29 #ifndef _SYS_EVENT_H_
   30 #define _SYS_EVENT_H_
   31 
   32 #include <sys/queue.h> 
   33 
   34 #define EVFILT_READ             (-1)
   35 #define EVFILT_WRITE            (-2)
   36 #define EVFILT_AIO              (-3)    /* attached to aio requests */
   37 #define EVFILT_VNODE            (-4)    /* attached to vnodes */
   38 #define EVFILT_PROC             (-5)    /* attached to struct proc */
   39 #define EVFILT_SIGNAL           (-6)    /* attached to struct proc */
   40 #define EVFILT_TIMER            (-7)    /* timers */
   41 /*      EVFILT_NETDEV           (-8)       no longer supported */
   42 #define EVFILT_FS               (-9)    /* filesystem events */
   43 #define EVFILT_LIO              (-10)   /* attached to lio requests */
   44 #define EVFILT_USER             (-11)   /* User events */
   45 #define EVFILT_SYSCOUNT         11
   46 
   47 #define EV_SET(kevp_, a, b, c, d, e, f) do {    \
   48         struct kevent *kevp = (kevp_);          \
   49         (kevp)->ident = (a);                    \
   50         (kevp)->filter = (b);                   \
   51         (kevp)->flags = (c);                    \
   52         (kevp)->fflags = (d);                   \
   53         (kevp)->data = (e);                     \
   54         (kevp)->udata = (f);                    \
   55 } while(0)
   56 
   57 struct kevent {
   58         uintptr_t       ident;          /* identifier for this event */
   59         short           filter;         /* filter for event */
   60         u_short         flags;
   61         u_int           fflags;
   62         intptr_t        data;
   63         void            *udata;         /* opaque user data identifier */
   64 };
   65 
   66 /* actions */
   67 #define EV_ADD          0x0001          /* add event to kq (implies enable) */
   68 #define EV_DELETE       0x0002          /* delete event from kq */
   69 #define EV_ENABLE       0x0004          /* enable event */
   70 #define EV_DISABLE      0x0008          /* disable event (not reported) */
   71 
   72 /* flags */
   73 #define EV_ONESHOT      0x0010          /* only report one occurrence */
   74 #define EV_CLEAR        0x0020          /* clear event state after reporting */
   75 #define EV_RECEIPT      0x0040          /* force EV_ERROR on success, data=0 */
   76 #define EV_DISPATCH     0x0080          /* disable event after reporting */
   77 
   78 #define EV_SYSFLAGS     0xF000          /* reserved by system */
   79 #define EV_DROP         0x1000          /* note should be dropped */
   80 #define EV_FLAG1        0x2000          /* filter-specific flag */
   81 
   82 /* returned values */
   83 #define EV_EOF          0x8000          /* EOF detected */
   84 #define EV_ERROR        0x4000          /* error, data contains errno */
   85 
   86  /*
   87   * data/hint flags/masks for EVFILT_USER, shared with userspace
   88   *
   89   * On input, the top two bits of fflags specifies how the lower twenty four
   90   * bits should be applied to the stored value of fflags.
   91   *
   92   * On output, the top two bits will always be set to NOTE_FFNOP and the
   93   * remaining twenty four bits will contain the stored fflags value.
   94   */
   95 #define NOTE_FFNOP      0x00000000              /* ignore input fflags */
   96 #define NOTE_FFAND      0x40000000              /* AND fflags */
   97 #define NOTE_FFOR       0x80000000              /* OR fflags */
   98 #define NOTE_FFCOPY     0xc0000000              /* copy fflags */
   99 #define NOTE_FFCTRLMASK 0xc0000000              /* masks for operations */
  100 #define NOTE_FFLAGSMASK 0x00ffffff
  101 
  102 #define NOTE_TRIGGER    0x01000000              /* Cause the event to be
  103                                                    triggered for output. */
  104 
  105 /*
  106  * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
  107  */
  108 #define NOTE_LOWAT      0x0001                  /* low water mark */
  109 
  110 /*
  111  * data/hint flags for EVFILT_VNODE, shared with userspace
  112  */
  113 #define NOTE_DELETE     0x0001                  /* vnode was removed */
  114 #define NOTE_WRITE      0x0002                  /* data contents changed */
  115 #define NOTE_EXTEND     0x0004                  /* size increased */
  116 #define NOTE_ATTRIB     0x0008                  /* attributes changed */
  117 #define NOTE_LINK       0x0010                  /* link count changed */
  118 #define NOTE_RENAME     0x0020                  /* vnode was renamed */
  119 #define NOTE_REVOKE     0x0040                  /* vnode access was revoked */
  120 
  121 /*
  122  * data/hint flags for EVFILT_PROC, shared with userspace
  123  */
  124 #define NOTE_EXIT       0x80000000              /* process exited */
  125 #define NOTE_FORK       0x40000000              /* process forked */
  126 #define NOTE_EXEC       0x20000000              /* process exec'd */
  127 #define NOTE_PCTRLMASK  0xf0000000              /* mask for hint bits */
  128 #define NOTE_PDATAMASK  0x000fffff              /* mask for pid */
  129 
  130 /* additional flags for EVFILT_PROC */
  131 #define NOTE_TRACK      0x00000001              /* follow across forks */
  132 #define NOTE_TRACKERR   0x00000002              /* could not track child */
  133 #define NOTE_CHILD      0x00000004              /* am a child process */
  134 
  135 struct knote;
  136 SLIST_HEAD(klist, knote);
  137 struct kqueue;
  138 TAILQ_HEAD(kqlist, kqueue);
  139 struct knlist {
  140         struct  klist   kl_list;
  141         void    (*kl_lock)(void *);     /* lock function */
  142         void    (*kl_unlock)(void *);
  143         void    (*kl_assert_locked)(void *);
  144         void    (*kl_assert_unlocked)(void *);
  145         void *kl_lockarg;               /* argument passed to kl_lockf() */
  146 };
  147 
  148 
  149 #ifdef _KERNEL
  150 
  151 /*
  152  * Flags for knote call
  153  */
  154 #define KNF_LISTLOCKED  0x0001                  /* knlist is locked */
  155 #define KNF_NOKQLOCK    0x0002                  /* do not keep KQ_LOCK */
  156 
  157 #define KNOTE(list, hist, flags)        knote(list, hist, flags)
  158 #define KNOTE_LOCKED(list, hint)        knote(list, hint, KNF_LISTLOCKED)
  159 #define KNOTE_UNLOCKED(list, hint)      knote(list, hint, 0)
  160 
  161 #define KNLIST_EMPTY(list)              SLIST_EMPTY(&(list)->kl_list)
  162 
  163 /*
  164  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
  165  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
  166  */
  167 #define NOTE_SIGNAL     0x08000000
  168 
  169 /*
  170  * Hint values for the optional f_touch event filter.  If f_touch is not set 
  171  * to NULL and f_isfd is zero the f_touch filter will be called with the type
  172  * argument set to EVENT_REGISTER during a kevent() system call.  It is also
  173  * called under the same conditions with the type argument set to EVENT_PROCESS
  174  * when the event has been triggered.
  175  */
  176 #define EVENT_REGISTER  1
  177 #define EVENT_PROCESS   2
  178 
  179 struct filterops {
  180         int     f_isfd;         /* true if ident == filedescriptor */
  181         int     (*f_attach)(struct knote *kn);
  182         void    (*f_detach)(struct knote *kn);
  183         int     (*f_event)(struct knote *kn, long hint);
  184         void    (*f_touch)(struct knote *kn, struct kevent *kev, u_long type);
  185 };
  186 
  187 /*
  188  * Setting the KN_INFLUX flag enables you to unlock the kq that this knote
  189  * is on, and modify kn_status as if you had the KQ lock.
  190  *
  191  * kn_sfflags, kn_sdata, and kn_kevent are protected by the knlist lock.
  192  */
  193 struct knote {
  194         SLIST_ENTRY(knote)      kn_link;        /* for kq */
  195         SLIST_ENTRY(knote)      kn_selnext;     /* for struct selinfo */
  196         struct                  knlist *kn_knlist;      /* f_attach populated */
  197         TAILQ_ENTRY(knote)      kn_tqe;
  198         struct                  kqueue *kn_kq;  /* which queue we are on */
  199         struct                  kevent kn_kevent;
  200         int                     kn_status;      /* protected by kq lock */
  201 #define KN_ACTIVE       0x01                    /* event has been triggered */
  202 #define KN_QUEUED       0x02                    /* event is on queue */
  203 #define KN_DISABLED     0x04                    /* event is disabled */
  204 #define KN_DETACHED     0x08                    /* knote is detached */
  205 #define KN_INFLUX       0x10                    /* knote is in flux */
  206 #define KN_MARKER       0x20                    /* ignore this knote */
  207 #define KN_KQUEUE       0x40                    /* this knote belongs to a kq */
  208 #define KN_HASKQLOCK    0x80                    /* for _inevent */
  209 #define KN_SCAN         0x100                   /* flux set in kqueue_scan() */
  210         int                     kn_sfflags;     /* saved filter flags */
  211         intptr_t                kn_sdata;       /* saved data field */
  212         union {
  213                 struct          file *p_fp;     /* file data pointer */
  214                 struct          proc *p_proc;   /* proc pointer */
  215                 struct          aiocblist *p_aio;       /* AIO job pointer */
  216                 struct          aioliojob *p_lio;       /* LIO job pointer */ 
  217         } kn_ptr;
  218         struct                  filterops *kn_fop;
  219         void                    *kn_hook;
  220         int                     kn_hookid;
  221 
  222 #define kn_id           kn_kevent.ident
  223 #define kn_filter       kn_kevent.filter
  224 #define kn_flags        kn_kevent.flags
  225 #define kn_fflags       kn_kevent.fflags
  226 #define kn_data         kn_kevent.data
  227 #define kn_fp           kn_ptr.p_fp
  228 };
  229 struct kevent_copyops {
  230         void    *arg;
  231         int     (*k_copyout)(void *arg, struct kevent *kevp, int count);
  232         int     (*k_copyin)(void *arg, struct kevent *kevp, int count);
  233 };
  234 
  235 struct thread;
  236 struct proc;
  237 struct knlist;
  238 struct mtx;
  239 struct rwlock;
  240 
  241 extern void     knote(struct knlist *list, long hint, int lockflags);
  242 extern void     knote_fork(struct knlist *list, int pid);
  243 extern void     knlist_add(struct knlist *knl, struct knote *kn, int islocked);
  244 extern void     knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
  245 extern void     knlist_remove_inevent(struct knlist *knl, struct knote *kn);
  246 extern int      knlist_empty(struct knlist *knl);
  247 extern void     knlist_init(struct knlist *knl, void *lock,
  248     void (*kl_lock)(void *), void (*kl_unlock)(void *),
  249     void (*kl_assert_locked)(void *), void (*kl_assert_unlocked)(void *));
  250 extern void     knlist_init_mtx(struct knlist *knl, struct mtx *lock);
  251 extern void     knlist_init_rw_reader(struct knlist *knl, struct rwlock *lock);
  252 extern void     knlist_destroy(struct knlist *knl);
  253 extern void     knlist_cleardel(struct knlist *knl, struct thread *td,
  254         int islocked, int killkn);
  255 #define knlist_clear(knl, islocked)                             \
  256                 knlist_cleardel((knl), NULL, (islocked), 0)
  257 #define knlist_delete(knl, td, islocked)                        \
  258                 knlist_cleardel((knl), (td), (islocked), 1)
  259 extern void     knote_fdclose(struct thread *p, int fd);
  260 extern int      kqfd_register(int fd, struct kevent *kev, struct thread *p,
  261                     int waitok);
  262 extern int      kqueue_add_filteropts(int filt, struct filterops *filtops);
  263 extern int      kqueue_del_filteropts(int filt);
  264 
  265 #else   /* !_KERNEL */
  266 
  267 #include <sys/cdefs.h>
  268 struct timespec;
  269 
  270 __BEGIN_DECLS
  271 int     kqueue(void);
  272 int     kevent(int kq, const struct kevent *changelist, int nchanges,
  273             struct kevent *eventlist, int nevents,
  274             const struct timespec *timeout);
  275 __END_DECLS
  276 
  277 #endif /* !_KERNEL */
  278 
  279 #endif /* !_SYS_EVENT_H_ */

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