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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_EVENT_H_
    #define _SYS_EVENT_H_
    
    #include <sys/_types.h>
    #include <sys/queue.h>
    
    #define EVFILT_READ             (-1)
    #define EVFILT_WRITE            (-2)
    #define EVFILT_AIO              (-3)    /* attached to aio requests */
    #define EVFILT_VNODE            (-4)    /* attached to vnodes */
    #define EVFILT_PROC             (-5)    /* attached to struct proc */
    #define EVFILT_SIGNAL           (-6)    /* attached to struct proc */
    #define EVFILT_TIMER            (-7)    /* timers */
    #define EVFILT_PROCDESC         (-8)    /* attached to process descriptors */
    #define EVFILT_FS               (-9)    /* filesystem events */
    #define EVFILT_LIO              (-10)   /* attached to lio requests */
    #define EVFILT_USER             (-11)   /* User events */
    #define EVFILT_SENDFILE         (-12)   /* attached to sendfile requests */
    #define EVFILT_EMPTY            (-13)   /* empty send socket buf */
    #define EVFILT_SYSCOUNT         13
    
    #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
    #define EV_SET(kevp_, a, b, c, d, e, f) do {    \
            *(kevp_) = (struct kevent){             \
                .ident = (a),                       \
                .filter = (b),                      \
                .flags = (c),                       \
                .fflags = (d),                      \
                .data = (e),                        \
                .udata = (f),                       \
                .ext = {0},                         \
            };                                      \
    } while (0)
    #else /* Pre-C99 or not STDC (e.g., C++) */
    /*
     * The definition of the local variable kevp could possibly conflict
     * with a user-defined value passed in parameters a-f.
     */
    #define EV_SET(kevp_, a, b, c, d, e, f) do {    \
            struct kevent *kevp = (kevp_);          \
            (kevp)->ident = (a);                    \
            (kevp)->filter = (b);                   \
            (kevp)->flags = (c);                    \
            (kevp)->fflags = (d);                   \
            (kevp)->data = (e);                     \
            (kevp)->udata = (f);                    \
            (kevp)->ext[0] = 0;                     \
            (kevp)->ext[1] = 0;                     \
            (kevp)->ext[2] = 0;                     \
            (kevp)->ext[3] = 0;                     \
    } while (0)
    #endif
    
    struct kevent {
            __uintptr_t     ident;          /* identifier for this event */
            short           filter;         /* filter for event */
            unsigned short  flags;          /* action flags for kqueue */
            unsigned int    fflags;         /* filter flag value */
            __int64_t       data;           /* filter data value */
            void            *udata;         /* opaque user data identifier */
            __uint64_t      ext[4];         /* extensions */
    };
    
    #if defined(_WANT_FREEBSD11_KEVENT)
    /* Older structure used in FreeBSD 11.x and older. */
    struct freebsd11_kevent {
            __uintptr_t     ident;          /* identifier for this event */
            short           filter;         /* filter for event */
            unsigned short  flags;
           unsigned int    fflags;
           __intptr_t      data;
           void            *udata;         /* opaque user data identifier */
   };
   #endif
   
   #if defined(_WANT_KEVENT32) || (defined(_KERNEL) && defined(__LP64__))
   struct kevent32 {
           __uint32_t      ident;          /* identifier for this event */
           short           filter;         /* filter for event */
           unsigned short  flags;
           unsigned int    fflags;
   #ifndef __amd64__
           __uint32_t      pad0;
   #endif
           __uint32_t      data1, data2;
           __uint32_t      udata;          /* opaque user data identifier */
   #ifndef __amd64__
           __uint32_t      pad1;
   #endif
           __uint32_t      ext64[8];
   };
   
   #ifdef _WANT_FREEBSD11_KEVENT
   struct freebsd11_kevent32 {
           __uint32_t      ident;          /* identifier for this event */
           short           filter;         /* filter for event */
           unsigned short  flags;
           unsigned int    fflags;
           __int32_t       data;
           __uint32_t      udata;          /* opaque user data identifier */
   };
   #endif
   #endif
   
   /* actions */
   #define EV_ADD          0x0001          /* add event to kq (implies enable) */
   #define EV_DELETE       0x0002          /* delete event from kq */
   #define EV_ENABLE       0x0004          /* enable event */
   #define EV_DISABLE      0x0008          /* disable event (not reported) */
   #define EV_FORCEONESHOT 0x0100          /* enable _ONESHOT and force trigger */
   #define EV_KEEPUDATA    0x0200          /* do not update the udata field */
   
   /* flags */
   #define EV_ONESHOT      0x0010          /* only report one occurrence */
   #define EV_CLEAR        0x0020          /* clear event state after reporting */
   #define EV_RECEIPT      0x0040          /* force EV_ERROR on success, data=0 */
   #define EV_DISPATCH     0x0080          /* disable event after reporting */
   
   #define EV_SYSFLAGS     0xF000          /* reserved by system */
   #define EV_DROP         0x1000          /* note should be dropped */
   #define EV_FLAG1        0x2000          /* filter-specific flag */
   #define EV_FLAG2        0x4000          /* filter-specific flag */
   
   /* returned values */
   #define EV_EOF          0x8000          /* EOF detected */
   #define EV_ERROR        0x4000          /* error, data contains errno */
   
    /*
     * data/hint flags/masks for EVFILT_USER, shared with userspace
     *
     * On input, the top two bits of fflags specifies how the lower twenty four
     * bits should be applied to the stored value of fflags.
     *
     * On output, the top two bits will always be set to NOTE_FFNOP and the
     * remaining twenty four bits will contain the stored fflags value.
     */
   #define NOTE_FFNOP      0x00000000              /* ignore input fflags */
   #define NOTE_FFAND      0x40000000              /* AND fflags */
   #define NOTE_FFOR       0x80000000              /* OR fflags */
   #define NOTE_FFCOPY     0xc0000000              /* copy fflags */
   #define NOTE_FFCTRLMASK 0xc0000000              /* masks for operations */
   #define NOTE_FFLAGSMASK 0x00ffffff
   
   #define NOTE_TRIGGER    0x01000000              /* Cause the event to be
                                                      triggered for output. */
   
   /*
    * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
    */
   #define NOTE_LOWAT      0x0001                  /* low water mark */
   #define NOTE_FILE_POLL  0x0002                  /* behave like poll() */
   
   /*
    * data/hint flags for EVFILT_VNODE, shared with userspace
    */
   #define NOTE_DELETE     0x0001                  /* vnode was removed */
   #define NOTE_WRITE      0x0002                  /* data contents changed */
   #define NOTE_EXTEND     0x0004                  /* size increased */
   #define NOTE_ATTRIB     0x0008                  /* attributes changed */
   #define NOTE_LINK       0x0010                  /* link count changed */
   #define NOTE_RENAME     0x0020                  /* vnode was renamed */
   #define NOTE_REVOKE     0x0040                  /* vnode access was revoked */
   #define NOTE_OPEN       0x0080                  /* vnode was opened */
   #define NOTE_CLOSE      0x0100                  /* file closed, fd did not
                                                      allowed write */
   #define NOTE_CLOSE_WRITE 0x0200                 /* file closed, fd did allowed
                                                      write */
   #define NOTE_READ       0x0400                  /* file was read */
   
   /*
    * data/hint flags for EVFILT_PROC and EVFILT_PROCDESC, shared with userspace
    */
   #define NOTE_EXIT       0x80000000              /* process exited */
   #define NOTE_FORK       0x40000000              /* process forked */
   #define NOTE_EXEC       0x20000000              /* process exec'd */
   #define NOTE_PCTRLMASK  0xf0000000              /* mask for hint bits */
   #define NOTE_PDATAMASK  0x000fffff              /* mask for pid */
   
   /* additional flags for EVFILT_PROC */
   #define NOTE_TRACK      0x00000001              /* follow across forks */
   #define NOTE_TRACKERR   0x00000002              /* could not track child */
   #define NOTE_CHILD      0x00000004              /* am a child process */
   
   /* additional flags for EVFILT_TIMER */
   #define NOTE_SECONDS            0x00000001      /* data is seconds */
   #define NOTE_MSECONDS           0x00000002      /* data is milliseconds */
   #define NOTE_USECONDS           0x00000004      /* data is microseconds */
   #define NOTE_NSECONDS           0x00000008      /* data is nanoseconds */
   #define NOTE_ABSTIME            0x00000010      /* timeout is absolute */
   
   struct knote;
   SLIST_HEAD(klist, knote);
   struct kqueue;
   TAILQ_HEAD(kqlist, kqueue);
   struct knlist {
           struct  klist   kl_list;
           void    (*kl_lock)(void *);     /* lock function */
           void    (*kl_unlock)(void *);
           void    (*kl_assert_lock)(void *, int);
           void    *kl_lockarg;            /* argument passed to lock functions */
           int     kl_autodestroy;
   };
   
   #ifdef _KERNEL
   
   /*
    * Flags for knote call
    */
   #define KNF_LISTLOCKED  0x0001                  /* knlist is locked */
   #define KNF_NOKQLOCK    0x0002                  /* do not keep KQ_LOCK */
   
   #define KNOTE(list, hint, flags)        knote(list, hint, flags)
   #define KNOTE_LOCKED(list, hint)        knote(list, hint, KNF_LISTLOCKED)
   #define KNOTE_UNLOCKED(list, hint)      knote(list, hint, 0)
   
   #define KNLIST_EMPTY(list)              SLIST_EMPTY(&(list)->kl_list)
   
   /*
    * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
    * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
    */
   #define NOTE_SIGNAL     0x08000000
   
   /*
    * Hint values for the optional f_touch event filter.  If f_touch is not set 
    * to NULL and f_isfd is zero the f_touch filter will be called with the type
    * argument set to EVENT_REGISTER during a kevent() system call.  It is also
    * called under the same conditions with the type argument set to EVENT_PROCESS
    * when the event has been triggered.
    */
   #define EVENT_REGISTER  1
   #define EVENT_PROCESS   2
   
   struct filterops {
           int     f_isfd;         /* true if ident == filedescriptor */
           int     (*f_attach)(struct knote *kn);
           void    (*f_detach)(struct knote *kn);
           int     (*f_event)(struct knote *kn, long hint);
           void    (*f_touch)(struct knote *kn, struct kevent *kev, u_long type);
   };
   
   /*
    * An in-flux knote cannot be dropped from its kq while the kq is
    * unlocked.  If the KN_SCAN flag is not set, a thread can only set
    * kn_influx when it is exclusive owner of the knote state, and can
    * modify kn_status as if it had the KQ lock.  KN_SCAN must not be set
    * on a knote which is already in flux.
    *
    * kn_sfflags, kn_sdata, and kn_kevent are protected by the knlist lock.
    */
   struct knote {
           SLIST_ENTRY(knote)      kn_link;        /* for kq */
           SLIST_ENTRY(knote)      kn_selnext;     /* for struct selinfo */
           struct                  knlist *kn_knlist;      /* f_attach populated */
           TAILQ_ENTRY(knote)      kn_tqe;
           struct                  kqueue *kn_kq;  /* which queue we are on */
           struct                  kevent kn_kevent;
           void                    *kn_hook;
           int                     kn_hookid;
           int                     kn_status;      /* protected by kq lock */
   #define KN_ACTIVE       0x01                    /* event has been triggered */
   #define KN_QUEUED       0x02                    /* event is on queue */
   #define KN_DISABLED     0x04                    /* event is disabled */
   #define KN_DETACHED     0x08                    /* knote is detached */
   #define KN_MARKER       0x20                    /* ignore this knote */
   #define KN_KQUEUE       0x40                    /* this knote belongs to a kq */
   #define KN_SCAN         0x100                   /* flux set in kqueue_scan() */
           int                     kn_influx;
           int                     kn_sfflags;     /* saved filter flags */
           int64_t                 kn_sdata;       /* saved data field */
           union {
                   struct          file *p_fp;     /* file data pointer */
                   struct          proc *p_proc;   /* proc pointer */
                   struct          kaiocb *p_aio;  /* AIO job pointer */
                   struct          aioliojob *p_lio;       /* LIO job pointer */
                   void            *p_v;           /* generic other pointer */
           } kn_ptr;
           struct                  filterops *kn_fop;
   
   #define kn_id           kn_kevent.ident
   #define kn_filter       kn_kevent.filter
   #define kn_flags        kn_kevent.flags
   #define kn_fflags       kn_kevent.fflags
   #define kn_data         kn_kevent.data
   #define kn_fp           kn_ptr.p_fp
   };
   struct kevent_copyops {
           void    *arg;
           int     (*k_copyout)(void *arg, struct kevent *kevp, int count);
           int     (*k_copyin)(void *arg, struct kevent *kevp, int count);
           size_t  kevent_size;
   };
   
   struct thread;
   struct proc;
   struct knlist;
   struct mtx;
   struct rwlock;
   
   void    knote(struct knlist *list, long hint, int lockflags);
   void    knote_fork(struct knlist *list, int pid);
   struct knlist *knlist_alloc(struct mtx *lock);
   void    knlist_detach(struct knlist *knl);
   void    knlist_add(struct knlist *knl, struct knote *kn, int islocked);
   void    knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
   int     knlist_empty(struct knlist *knl);
   void    knlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *),
               void (*kl_unlock)(void *), void (*kl_assert_lock)(void *, int));
   void    knlist_init_mtx(struct knlist *knl, struct mtx *lock);
   void    knlist_destroy(struct knlist *knl);
   void    knlist_cleardel(struct knlist *knl, struct thread *td,
               int islocked, int killkn);
   #define knlist_clear(knl, islocked)                             \
           knlist_cleardel((knl), NULL, (islocked), 0)
   #define knlist_delete(knl, td, islocked)                        \
           knlist_cleardel((knl), (td), (islocked), 1)
   void    knote_fdclose(struct thread *p, int fd);
   int     kqfd_register(int fd, struct kevent *kev, struct thread *p,
               int mflag);
   int     kqueue_add_filteropts(int filt, struct filterops *filtops);
   int     kqueue_del_filteropts(int filt);
   void    kqueue_drain_schedtask(void);
   
   #else   /* !_KERNEL */
   
   #include <sys/cdefs.h>
   struct timespec;
   
   __BEGIN_DECLS
   int     kqueue(void);
   int     kevent(int kq, const struct kevent *changelist, int nchanges,
               struct kevent *eventlist, int nevents,
               const struct timespec *timeout);
   __END_DECLS
   
   #endif /* !_KERNEL */
   
   #endif /* !_SYS_EVENT_H_ */

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