/* * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * 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 */ #ifndef _SYS_LOCKF_H_ #define _SYS_LOCKF_H_ #include <sys/appleapiopts.h> #include <sys/cdefs.h> #ifdef __APPLE_API_PRIVATE /* * 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 #if 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 /* LOCKF_DEBUG */ #endif /* __APPLE_API_PRIVATE */ #endif /* !_SYS_LOCKF_H_ */