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

     /*
      * Copyright (c) 1990, 1993
      *      The Regents of the University of California.  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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)filedesc.h  8.1 (Berkeley) 6/2/93
     * $FreeBSD: releng/5.2/sys/sys/sigio.h 108524 2003-01-01 01:56:19Z alfred $
     */
    
    #ifndef _SYS_SIGIO_H_
    #define _SYS_SIGIO_H_
    
    /*
     * This structure holds the information needed to send a SIGIO or
     * a SIGURG signal to a process or process group when new data arrives
     * on a device or socket.  The structure is placed on an SLIST belonging
     * to the proc or pgrp so that the entire list may be revoked when the
     * process exits or the process group disappears.
     *
     * (c)  const
     * (pg) locked by either the process or process group lock
     */
    struct sigio {
            union {
                    struct  proc *siu_proc; /* (c)  process to receive SIGIO/SIGURG */
                    struct  pgrp *siu_pgrp; /* (c)  process group to receive ... */
            } sio_u;
            SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */
            struct  sigio **sio_myref;      /* (c)  location of the pointer that holds
                                             *      the reference to this structure */
            struct  ucred *sio_ucred;       /* (c)  current credentials */
            pid_t   sio_pgid;               /* (c)  pgid for signals */
    };
    #define sio_proc        sio_u.siu_proc
    #define sio_pgrp        sio_u.siu_pgrp
    
    SLIST_HEAD(sigiolst, sigio);
    
    pid_t   fgetown(struct sigio **sigiop);
    int     fsetown(pid_t pgid, struct sigio **sigiop);
    void    funsetown(struct sigio **sigiop);
    void    funsetownlst(struct sigiolst *sigiolst);
    
    #endif /* _SYS_SIGIO_H_ */

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