File: [local] / src / sys / sys / lockf.h (download)
Revision 1.2, Sun Mar 3 12:11:57 1996 UTC (28 years, 3 months ago) by niklas
Branch: MAIN
CVS Tags: kame_19991208, SMP_BASE, OPENBSD_2_9_BASE, OPENBSD_2_9, OPENBSD_2_8_BASE, OPENBSD_2_8, OPENBSD_2_7_BASE, OPENBSD_2_7, OPENBSD_2_6_BASE, OPENBSD_2_6, OPENBSD_2_5_BASE, OPENBSD_2_5, OPENBSD_2_4_BASE, OPENBSD_2_4, OPENBSD_2_3_BASE, OPENBSD_2_3, OPENBSD_2_2_BASE, OPENBSD_2_2, OPENBSD_2_1_BASE, OPENBSD_2_1, OPENBSD_2_0_BASE, OPENBSD_2_0 Branch point for: SMP
Changes since 1.1: +1 -0 lines
From NetBSD: 960217 merge
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/* $OpenBSD: lockf.h,v 1.2 1996/03/03 12:11:57 niklas 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. 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.
*
* @(#)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.
*/
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 lockf *lf_block; /* The list of blocked locks */
};
/* Maximum length of sleep chains to traverse to try and detect deadlock. */
#define MAXDEPTH 50
__BEGIN_DECLS
void lf_addblock __P((struct lockf *, struct lockf *));
int lf_advlock __P((struct lockf **,
off_t, caddr_t, int, struct flock *, int));
int lf_clearlock __P((struct lockf *));
int lf_findoverlap __P((struct lockf *,
struct lockf *, int, struct lockf ***, struct lockf **));
struct lockf *
lf_getblock __P((struct lockf *));
int lf_getlock __P((struct lockf *, struct flock *));
int lf_setlock __P((struct lockf *));
void lf_split __P((struct lockf *, struct lockf *));
void lf_wakelock __P((struct lockf *));
__END_DECLS
#ifdef LOCKF_DEBUG
extern int lockf_debug;
__BEGIN_DECLS
void lf_print __P((char *, struct lockf *));
void lf_printlist __P((char *, struct lockf *));
__END_DECLS
#endif