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Annotation of sys/sys/lockf.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: lockf.h,v 1.7 2005/03/10 17:26:10 tedu Exp $  */
        !             2: /*     $NetBSD: lockf.h,v 1.5 1994/06/29 06:44:33 cgd Exp $    */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1991, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to Berkeley by
        !             9:  * Scooter Morris at Genentech Inc.
        !            10:  *
        !            11:  * Redistribution and use in source and binary forms, with or without
        !            12:  * modification, are permitted provided that the following conditions
        !            13:  * are met:
        !            14:  * 1. Redistributions of source code must retain the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer.
        !            16:  * 2. Redistributions in binary form must reproduce the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer in the
        !            18:  *    documentation and/or other materials provided with the distribution.
        !            19:  * 3. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  *
        !            35:  *     @(#)lockf.h     8.1 (Berkeley) 6/11/93
        !            36:  */
        !            37:
        !            38: /*
        !            39:  * The lockf structure is a kernel structure which contains the information
        !            40:  * associated with a byte range lock.  The lockf structures are linked into
        !            41:  * the inode structure. Locks are sorted by the starting byte of the lock for
        !            42:  * efficiency.
        !            43:  */
        !            44: TAILQ_HEAD(locklist, lockf);
        !            45:
        !            46: struct lockf {
        !            47:        short   lf_flags;        /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */
        !            48:        short   lf_type;         /* Lock type: F_RDLCK, F_WRLCK */
        !            49:        off_t   lf_start;        /* The byte # of the start of the lock */
        !            50:        off_t   lf_end;          /* The byte # of the end of the lock (-1=EOF)*/
        !            51:        caddr_t lf_id;           /* The id of the resource holding the lock */
        !            52:        struct  lockf **lf_head; /* Back pointer to the head of lockf list */
        !            53:        struct  lockf *lf_next;  /* A pointer to the next lock on this inode */
        !            54:        struct  locklist lf_blkhd;      /* The list of blocked locks */
        !            55:        TAILQ_ENTRY(lockf) lf_block; /* A request waiting for a lock */
        !            56:        uid_t   lf_uid;         /* User ID responsible */
        !            57: };
        !            58:
        !            59: /* Maximum length of sleep chains to traverse to try and detect deadlock. */
        !            60: #define MAXDEPTH 50
        !            61:
        !            62: __BEGIN_DECLS
        !            63: void    lf_init(void);
        !            64: int     lf_advlock(struct lockf **,
        !            65:            off_t, caddr_t, int, struct flock *, int);
        !            66: int     lf_clearlock(struct lockf *);
        !            67: int     lf_findoverlap(struct lockf *,
        !            68:            struct lockf *, int, struct lockf ***, struct lockf **);
        !            69: struct lockf *
        !            70:         lf_getblock(struct lockf *);
        !            71: int     lf_getlock(struct lockf *, struct flock *);
        !            72: int     lf_setlock(struct lockf *);
        !            73: void    lf_split(struct lockf *, struct lockf *);
        !            74: void    lf_wakelock(struct lockf *);
        !            75: __END_DECLS
        !            76:
        !            77: #ifdef LOCKF_DEBUG
        !            78: extern int lockf_debug;
        !            79:
        !            80: __BEGIN_DECLS
        !            81: void   lf_print(char *, struct lockf *);
        !            82: void   lf_printlist(char *, struct lockf *);
        !            83: __END_DECLS
        !            84: #endif