projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5b2abdfb A |
1 | /*- |
| 2 | * Copyright (c) 1997 The NetBSD Foundation, Inc. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to The NetBSD Foundation | |
| 6 | * by Klaus Klein. | |
| 7 | * | |
| 8 | * Redistribution and use in source and binary forms, with or without | |
| 9 | * modification, are permitted provided that the following conditions | |
| 10 | * are met: | |
| 11 | * 1. Redistributions of source code must retain the above copyright | |
| 12 | * notice, this list of conditions and the following disclaimer. | |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 14 | * notice, this list of conditions and the following disclaimer in the | |
| 15 | * documentation and/or other materials provided with the distribution. | |
| 16 | * 3. All advertising materials mentioning features or use of this software | |
| 17 | * must display the following acknowledgement: | |
| 18 | * This product includes software developed by the NetBSD | |
| 19 | * Foundation, Inc. and its contributors. | |
| 20 | * 4. Neither the name of The NetBSD Foundation nor the names of its | |
| 21 | * contributors may be used to endorse or promote products derived | |
| 22 | * from this software without specific prior written permission. | |
| 23 | * | |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS | |
| 25 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
| 26 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 27 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS | |
| 28 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 34 | * POSSIBILITY OF SUCH DAMAGE. | |
| 5b2abdfb A |
35 | */ |
| 36 | ||
| 9385eb3d A |
37 | /* $NetBSD: lockf.c,v 1.1 1997/12/20 20:23:18 kleink Exp $ */ |
| 38 | #include <sys/cdefs.h> | |
| 39 | __FBSDID("$FreeBSD: src/lib/libc/gen/lockf.c,v 1.8 2002/02/01 00:57:29 obrien Exp $"); | |
| 5b2abdfb | 40 | |
| 9385eb3d | 41 | #include "namespace.h" |
| 5b2abdfb A |
42 | #include <errno.h> |
| 43 | #include <fcntl.h> | |
| 44 | #include <unistd.h> | |
| 9385eb3d | 45 | #include "un-namespace.h" |
| 5b2abdfb A |
46 | |
| 47 | int | |
| 48 | lockf(filedes, function, size) | |
| 49 | int filedes; | |
| 50 | int function; | |
| 51 | off_t size; | |
| 52 | { | |
| 53 | struct flock fl; | |
| 54 | int cmd; | |
| 55 | ||
| 56 | fl.l_start = 0; | |
| 57 | fl.l_len = size; | |
| 58 | fl.l_whence = SEEK_CUR; | |
| 59 | ||
| 60 | switch (function) { | |
| 61 | case F_ULOCK: | |
| 62 | cmd = F_SETLK; | |
| 63 | fl.l_type = F_UNLCK; | |
| 64 | break; | |
| 65 | case F_LOCK: | |
| 66 | cmd = F_SETLKW; | |
| 67 | fl.l_type = F_WRLCK; | |
| 68 | break; | |
| 69 | case F_TLOCK: | |
| 70 | cmd = F_SETLK; | |
| 71 | fl.l_type = F_WRLCK; | |
| 72 | break; | |
| 73 | case F_TEST: | |
| 74 | fl.l_type = F_WRLCK; | |
| 9385eb3d | 75 | if (_fcntl(filedes, F_GETLK, &fl) == -1) |
| 5b2abdfb A |
76 | return (-1); |
| 77 | if (fl.l_type == F_UNLCK || fl.l_pid == getpid()) | |
| 78 | return (0); | |
| 79 | errno = EAGAIN; | |
| 80 | return (-1); | |
| 81 | /* NOTREACHED */ | |
| 82 | default: | |
| 83 | errno = EINVAL; | |
| 84 | return (-1); | |
| 85 | /* NOTREACHED */ | |
| 86 | } | |
| 87 | ||
| 9385eb3d | 88 | return (_fcntl(filedes, cmd, &fl)); |
| 5b2abdfb | 89 | } |