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

     /*-
      * 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_
    
    #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_NETDEV           (-8)    /* network devices */
    #define EVFILT_FS               (-9)    /* filesystem events */
    
    #define EVFILT_SYSCOUNT         9
    
    #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);                    \
    } while(0)
    
    struct kevent {
            uintptr_t       ident;          /* identifier for this event */
            short           filter;         /* filter for event */
            u_short         flags;
            u_int           fflags;
            intptr_t        data;
            void            *udata;         /* opaque user data identifier */
    };
    
    /* 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) */
    
    /* flags */
    #define EV_ONESHOT      0x0010          /* only report one occurrence */
    #define EV_CLEAR        0x0020          /* clear event state after reporting */
    
    #define EV_SYSFLAGS     0xF000          /* reserved by system */
    #define EV_FLAG1        0x2000          /* filter-specific flag */
    
    /* returned values */
    #define EV_EOF          0x8000          /* EOF detected */
    #define EV_ERROR        0x4000          /* error, data contains errno */
    
    /*
     * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
     */
    #define NOTE_LOWAT      0x0001                  /* low water mark */
    
    /*
     * 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 */
    
    /*
     * data/hint flags for EVFILT_PROC, 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 */
   
   /*
    * data/hint flags for EVFILT_NETDEV, shared with userspace
    */
   #define NOTE_LINKUP     0x0001                  /* link is up */
   #define NOTE_LINKDOWN   0x0002                  /* link is down */
   #define NOTE_LINKINV    0x0004                  /* link state is invalid */
   
   /*
    * This is currently visible to userland to work around broken
    * programs which pull in <sys/proc.h>.
    */
   #include <sys/queue.h> 
   #include <sys/_lock.h>
   #include <sys/_mutex.h>
   struct knote;
   SLIST_HEAD(klist, knote);
   struct kqueue;
   SLIST_HEAD(kqlist, kqueue);
   struct knlist {
           struct  mtx     *kl_lock;       /* lock to protect kll_list */
           struct  klist   kl_list;
   };
   
   
   #ifdef _KERNEL
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_KQUEUE);
   #endif
   
   #define KNOTE(list, hist, lock)         knote(list, hist, lock)
   #define KNOTE_LOCKED(list, hint)        knote(list, hint, 1)
   #define KNOTE_UNLOCKED(list, hint)      knote(list, hint, 0)
   
   /*
    * 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
   
   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);
   };
   
   /*
    * Setting the KN_INFLUX flag enables you to unlock the kq that this knote
    * is on, and modify kn_status as if you had the KQ lock.
    *
    * 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;
           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_INFLUX       0x10                    /* knote is in flux */
   #define KN_MARKER       0x20                    /* ignore this knote */
   #define KN_KQUEUE       0x40                    /* this knote belongs to a kq */
   #define KN_HASKQLOCK    0x80                    /* for _inevent */
           int                     kn_sfflags;     /* saved filter flags */
           intptr_t                kn_sdata;       /* saved data field */
           union {
                   struct          file *p_fp;     /* file data pointer */
                   struct          proc *p_proc;   /* proc pointer */
           } kn_ptr;
           struct                  filterops *kn_fop;
           void                    *kn_hook;
   
   #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);
   };
   
   struct thread;
   struct proc;
   struct knlist;
   
   extern void     knote(struct knlist *list, long hint, int islocked);
   extern void     knlist_add(struct knlist *knl, struct knote *kn, int islocked);
   extern void     knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
   extern void     knlist_remove_inevent(struct knlist *knl, struct knote *kn);
   extern int      knlist_empty(struct knlist *knl);
   extern void     knlist_init(struct knlist *knl, struct mtx *mtx);
   extern void     knlist_destroy(struct knlist *knl);
   extern 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)
   extern void     knote_fdclose(struct thread *p, int fd);
   extern int      kqueue_register(struct kqueue *kq,
                       struct kevent *kev, struct thread *p, int waitok);
   extern int      kqueue_add_filteropts(int filt, struct filterops *filtops);
   extern int      kqueue_del_filteropts(int filt);
   
   #else   /* !_KERNEL */
   
   #include <sys/cdefs.h>
   struct timespec;
   
   __BEGIN_DECLS
   int     kqueue(void);
   int     kevent(int kq, 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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