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

     /*      $OpenBSD: sigio.h,v 1.4 2020/01/08 16:27:42 visa Exp $  */
     
     /*-
      * 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. 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: head/sys/sys/sigio.h 326023 2017-11-20 19:43:44Z pfg $
     */
    
    #ifndef _SYS_SIGIO_H_
    #define _SYS_SIGIO_H_
    
    struct sigio;
    LIST_HEAD(sigiolst, sigio);
    
    /*
     * sigio registration
     *
     * Locking:
     *      S       sigio_lock
     */
    struct sigio_ref {
            struct sigio    *sir_sigio;     /* [S] associated sigio struct */
    };
    
    #ifdef _KERNEL
    
    /*
     * 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 LIST belonging
     * to the proc or pgrp so that the entire list may be revoked when the
     * process exits or the process group disappears.
     *
     * Locking:
     *      I       immutable after creation
     *      S       sigio_lock
     */
    struct sigio {
            union {
                    struct  process *siu_proc;
                                            /* [I] process to receive
                                             *     SIGIO/SIGURG */
                    struct  pgrp *siu_pgrp; /* [I] process group to receive ... */
            } sio_u;
            LIST_ENTRY(sigio) sio_pgsigio;  /* [S] sigio's for process or group */
            struct  sigio_ref *sio_myref;   /* [I] location of the pointer that
                                             *     holds the reference to
                                             *     this structure */
            struct  ucred *sio_ucred;       /* [I] current credentials */
            pid_t   sio_pgid;               /* [I] pgid for signals */
    };
    #define sio_proc        sio_u.siu_proc
    #define sio_pgrp        sio_u.siu_pgrp
    
    static inline void
    sigio_init(struct sigio_ref *sir)
    {
            sir->sir_sigio = NULL;
    }
    
    void    sigio_copy(struct sigio_ref *, struct sigio_ref *);
    void    sigio_free(struct sigio_ref *);
    void    sigio_freelist(struct sigiolst *);
    void    sigio_getown(struct sigio_ref *, u_long, caddr_t);
    int     sigio_setown(struct sigio_ref *, u_long, caddr_t);
    
    #endif /* _KERNEL */
    
    #endif /* _SYS_SIGIO_H_ */

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