| | 1 | /* |
| | 2 | * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| | 7 | * |
| | 8 | * This file contains Original Code and/or Modifications of Original Code |
| | 9 | * as defined in and that are subject to the Apple Public Source License |
| | 10 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 11 | * compliance with the License. Please obtain a copy of the License at |
| | 12 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| | 13 | * file. |
| | 14 | * |
| | 15 | * The Original Code and all software distributed under the License are |
| | 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 20 | * Please see the License for the specific language governing rights and |
| | 21 | * limitations under the License. |
| | 22 | * |
| | 23 | * @APPLE_LICENSE_HEADER_END@ |
| | 24 | */ |
| | 25 | /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ |
| | 26 | /* |
| | 27 | * Copyright (c) 1991, 1993 |
| | 28 | * The Regents of the University of California. All rights reserved. |
| | 29 | * |
| | 30 | * This code is derived from software contributed to Berkeley by |
| | 31 | * Scooter Morris at Genentech Inc. |
| | 32 | * |
| | 33 | * Redistribution and use in source and binary forms, with or without |
| | 34 | * modification, are permitted provided that the following conditions |
| | 35 | * are met: |
| | 36 | * 1. Redistributions of source code must retain the above copyright |
| | 37 | * notice, this list of conditions and the following disclaimer. |
| | 38 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 39 | * notice, this list of conditions and the following disclaimer in the |
| | 40 | * documentation and/or other materials provided with the distribution. |
| | 41 | * 3. All advertising materials mentioning features or use of this software |
| | 42 | * must display the following acknowledgement: |
| | 43 | * This product includes software developed by the University of |
| | 44 | * California, Berkeley and its contributors. |
| | 45 | * 4. Neither the name of the University nor the names of its contributors |
| | 46 | * may be used to endorse or promote products derived from this software |
| | 47 | * without specific prior written permission. |
| | 48 | * |
| | 49 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 50 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 51 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 52 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 53 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 54 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 55 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 56 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 57 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 58 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 59 | * SUCH DAMAGE. |
| | 60 | * |
| | 61 | * @(#)lockf.h 8.1 (Berkeley) 6/11/93 |
| | 62 | */ |
| | 63 | |
| | 64 | #ifndef _SYS_LOCKF_H_ |
| | 65 | #define _SYS_LOCKF_H_ |
| | 66 | |
| | 67 | #include <sys/appleapiopts.h> |
| | 68 | |
| | 69 | #ifdef __APPLE_API_PRIVATE |
| | 70 | /* |
| | 71 | * The lockf structure is a kernel structure which contains the information |
| | 72 | * associated with a byte range lock. The lockf structures are linked into |
| | 73 | * the inode structure. Locks are sorted by the starting byte of the lock for |
| | 74 | * efficiency. |
| | 75 | */ |
| | 76 | struct lockf { |
| | 77 | short lf_flags; /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */ |
| | 78 | short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ |
| | 79 | off_t lf_start; /* The byte # of the start of the lock */ |
| | 80 | off_t lf_end; /* The byte # of the end of the lock (-1=EOF)*/ |
| | 81 | caddr_t lf_id; /* The id of the resource holding the lock */ |
| | 82 | struct lockf **lf_head; /* Back pointer to the head of lockf list */ |
| | 83 | struct lockf *lf_next; /* A pointer to the next lock on this inode */ |
| | 84 | struct lockf *lf_block; /* The list of blocked locks */ |
| | 85 | }; |
| | 86 | |
| | 87 | /* Maximum length of sleep chains to traverse to try and detect deadlock. */ |
| | 88 | #define MAXDEPTH 50 |
| | 89 | |
| | 90 | __BEGIN_DECLS |
| | 91 | void lf_addblock __P((struct lockf *, struct lockf *)); |
| | 92 | int lf_advlock __P((struct lockf **, |
| | 93 | off_t, caddr_t, int, struct flock *, int)); |
| | 94 | int lf_clearlock __P((struct lockf *)); |
| | 95 | int lf_findoverlap __P((struct lockf *, |
| | 96 | struct lockf *, int, struct lockf ***, struct lockf **)); |
| | 97 | struct lockf * |
| | 98 | lf_getblock __P((struct lockf *)); |
| | 99 | int lf_getlock __P((struct lockf *, struct flock *)); |
| | 100 | int lf_setlock __P((struct lockf *)); |
| | 101 | void lf_split __P((struct lockf *, struct lockf *)); |
| | 102 | void lf_wakelock __P((struct lockf *)); |
| | 103 | __END_DECLS |
| | 104 | |
| | 105 | #if LOCKF_DEBUG |
| | 106 | extern int lockf_debug; |
| | 107 | |
| | 108 | __BEGIN_DECLS |
| | 109 | void lf_print __P((char *, struct lockf *)); |
| | 110 | void lf_printlist __P((char *, struct lockf *)); |
| | 111 | __END_DECLS |
| | 112 | #endif /* LOCKF_DEBUG */ |
| | 113 | |
| | 114 | #endif /* __APPLE_API_PRIVATE */ |
| | 115 | |
| | 116 | #endif /* !_SYS_LOCKF_H_ */ |
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