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Annotation of sys/sys/lockf.h, Revision 1.1.1.1

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