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/sigio.h

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    1 /*-
    2  * Copyright (c) 1990, 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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)filedesc.h  8.1 (Berkeley) 6/2/93
   30  * $FreeBSD: releng/11.1/sys/sys/sigio.h 139825 2005-01-07 02:29:27Z imp $
   31  */
   32 
   33 #ifndef _SYS_SIGIO_H_
   34 #define _SYS_SIGIO_H_
   35 
   36 /*
   37  * This structure holds the information needed to send a SIGIO or
   38  * a SIGURG signal to a process or process group when new data arrives
   39  * on a device or socket.  The structure is placed on an SLIST belonging
   40  * to the proc or pgrp so that the entire list may be revoked when the
   41  * process exits or the process group disappears.
   42  *
   43  * (c)  const
   44  * (pg) locked by either the process or process group lock
   45  */
   46 struct sigio {
   47         union {
   48                 struct  proc *siu_proc; /* (c)  process to receive SIGIO/SIGURG */
   49                 struct  pgrp *siu_pgrp; /* (c)  process group to receive ... */
   50         } sio_u;
   51         SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */
   52         struct  sigio **sio_myref;      /* (c)  location of the pointer that holds
   53                                          *      the reference to this structure */
   54         struct  ucred *sio_ucred;       /* (c)  current credentials */
   55         pid_t   sio_pgid;               /* (c)  pgid for signals */
   56 };
   57 #define sio_proc        sio_u.siu_proc
   58 #define sio_pgrp        sio_u.siu_pgrp
   59 
   60 SLIST_HEAD(sigiolst, sigio);
   61 
   62 pid_t   fgetown(struct sigio **sigiop);
   63 int     fsetown(pid_t pgid, struct sigio **sigiop);
   64 void    funsetown(struct sigio **sigiop);
   65 void    funsetownlst(struct sigiolst *sigiolst);
   66 
   67 #endif /* _SYS_SIGIO_H_ */

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