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

     /*      $OpenBSD: lockf.h,v 1.8 2008/09/19 12:24:55 art Exp $   */
     /*      $NetBSD: lockf.h,v 1.5 1994/06/29 06:44:33 cgd Exp $    */
     
     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Scooter Morris at Genentech Inc.
     *
     * 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.
     *
     *      @(#)lockf.h     8.1 (Berkeley) 6/11/93
     */
    
    /*
     * The lockf structure is a kernel structure which contains the information
     * associated with a byte range lock.  The lockf structures are linked into
     * the inode structure. Locks are sorted by the starting byte of the lock for
     * efficiency.
     */
    TAILQ_HEAD(locklist, lockf);
    
    struct lockf {
            short   lf_flags;        /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */
            short   lf_type;         /* Lock type: F_RDLCK, F_WRLCK */
            off_t   lf_start;        /* The byte # of the start of the lock */
            off_t   lf_end;          /* The byte # of the end of the lock (-1=EOF)*/
            caddr_t lf_id;           /* The id of the resource holding the lock */
            struct  lockf **lf_head; /* Back pointer to the head of lockf list */
            struct  lockf *lf_next;  /* A pointer to the next lock on this inode */
            struct  locklist lf_blkhd;      /* The list of blocked locks */
            TAILQ_ENTRY(lockf) lf_block; /* A request waiting for a lock */
            uid_t   lf_uid;         /* User ID responsible */
            pid_t   lf_pid;         /* POSIX - owner pid */
    };
    
    /* Maximum length of sleep chains to traverse to try and detect deadlock. */
    #define MAXDEPTH 50
    
    __BEGIN_DECLS
    void     lf_init(void);
    int      lf_advlock(struct lockf **,
                off_t, caddr_t, int, struct flock *, int);
    int      lf_clearlock(struct lockf *);
    int      lf_findoverlap(struct lockf *,
                struct lockf *, int, struct lockf ***, struct lockf **);
    struct lockf *
             lf_getblock(struct lockf *);
    int      lf_getlock(struct lockf *, struct flock *);
    int      lf_setlock(struct lockf *);
    void     lf_split(struct lockf *, struct lockf *);
    void     lf_wakelock(struct lockf *);
    __END_DECLS
    
    #ifdef LOCKF_DEBUG
    extern int lockf_debug;
    
    __BEGIN_DECLS
    void    lf_print(char *, struct lockf *);
    void    lf_printlist(char *, struct lockf *);
    __END_DECLS
    #endif

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