sys/sys/selinfo.h

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)selinfo.h        8.2 (Berkeley) 1/4/94
  34  * $DragonFly: src/sys/sys/selinfo.h,v 1.3 2007/02/18 16:13:27 corecode Exp $
  35  */
  36
  37 #ifndef _SYS_SELINFO_H_
  38 #define _SYS_SELINFO_H_
  39
  40 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  41
  42 #include <sys/signal.h>
  43
  44 #include <sys/event.h>                  /* for struct klist */
  45 #include <net/netisr.h>                 /* for struct notifymsglist */
  46
  47 /*
  48  * Used to maintain information about processes that wish to be
  49  * notified when I/O becomes possible.
  50  */
  51 struct selinfo {
  52         pid_t   si_pid;                 /* process to be notified */
  53         lwpid_t si_tid;                 /* lwp within this process */
  54         struct  klist si_note;          /* kernel note list */
  55         struct  notifymsglist si_mlist; /* list of pending predicate messages */
  56         short   si_flags;               /* see below */
  57 };
  58 #define SI_COLL 0x0001          /* collision occurred */
  59
  60 #define SEL_WAITING(sel)        (sel->si_pid != 0 || (sel->si_flags & SI_COLL) != 0)
  61
  62 struct thread;
  63
  64 void    selrecord (struct thread *selector, struct selinfo *);
  65 void    selwakeup (struct selinfo *);
  66
  67 #endif
  68
  69 #endif /* !_SYS_SELINFO_H_ */