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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)filedesc.h  8.1 (Berkeley) 6/2/93
   32  * $FreeBSD$
   33  */
   34 
   35 #ifndef _SYS_SIGIO_H_
   36 #define _SYS_SIGIO_H_
   37 
   38 /*
   39  * This structure holds the information needed to send a SIGIO or
   40  * a SIGURG signal to a process or process group when new data arrives
   41  * on a device or socket.  The structure is placed on an SLIST belonging
   42  * to the proc or pgrp so that the entire list may be revoked when the
   43  * process exits or the process group disappears.
   44  *
   45  * (c)  const
   46  * (pg) locked by either the process or process group lock
   47  */
   48 struct sigio {
   49         union {
   50                 struct  proc *siu_proc; /* (c)  process to receive SIGIO/SIGURG */
   51                 struct  pgrp *siu_pgrp; /* (c)  process group to receive ... */
   52         } sio_u;
   53         SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */
   54         struct  sigio **sio_myref;      /* (c)  location of the pointer that holds
   55                                          *      the reference to this structure */
   56         struct  ucred *sio_ucred;       /* (c)  current credentials */
   57         pid_t   sio_pgid;               /* (c)  pgid for signals */
   58 };
   59 #define sio_proc        sio_u.siu_proc
   60 #define sio_pgrp        sio_u.siu_pgrp
   61 
   62 SLIST_HEAD(sigiolst, sigio);
   63 
   64 pid_t   fgetown(struct sigio **sigiop);
   65 int     fsetown(pid_t pgid, struct sigio **sigiop);
   66 void    funsetown(struct sigio **sigiop);
   67 void    funsetownlst(struct sigiolst *sigiolst);
   68 
   69 #endif /* _SYS_SIGIO_H_ */

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