projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 1f2f436a | 1 | /* $NetBSD: lockf.c,v 1.3 2008/04/28 20:22:59 martin Exp $ */ |
| 224c7076 A |
2 | /*- |
| 3 | * Copyright (c) 1997 The NetBSD Foundation, Inc. | |
| 4 | * All rights reserved. | |
| 5 | * | |
| 6 | * This code is derived from software contributed to The NetBSD Foundation | |
| 7 | * by Klaus Klein. | |
| 8 | * | |
| 9 | * Redistribution and use in source and binary forms, with or without | |
| 10 | * modification, are permitted provided that the following conditions | |
| 11 | * are met: | |
| 12 | * 1. Redistributions of source code must retain the above copyright | |
| 13 | * notice, this list of conditions and the following disclaimer. | |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 15 | * notice, this list of conditions and the following disclaimer in the | |
| 16 | * documentation and/or other materials provided with the distribution. | |
| 224c7076 A |
17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS | |
| 19 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
| 20 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 21 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS | |
| 22 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 28 | * POSSIBILITY OF SUCH DAMAGE. | |
| 29 | */ | |
| 30 | ||
| 224c7076 | 31 | #include <sys/cdefs.h> |
| 1f2f436a | 32 | __FBSDID("$FreeBSD: src/lib/libc/gen/lockf.c,v 1.10 2009/03/04 01:01:26 delphij Exp $"); |
| 224c7076 A |
33 | |
| 34 | #ifdef VARIANT_CANCELABLE | |
| 35 | int __fcntl(int, int, void *); | |
| 36 | #else /* !VARIANT_CANCELABLE */ | |
| 37 | int __fcntl_nocancel(int, int, void *); | |
| 38 | #endif /* VARIANT_CANCELABLE */ | |
| 39 | ||
| 40 | ||
| 41 | #include "namespace.h" | |
| 42 | #include <errno.h> | |
| 43 | #include <fcntl.h> | |
| 44 | #include <unistd.h> | |
| 45 | #include "un-namespace.h" | |
| 46 | ||
| 47 | int | |
| 1f2f436a | 48 | lockf(int filedes, int function, off_t size) |
| 224c7076 A |
49 | { |
| 50 | struct flock fl; | |
| 51 | int cmd; | |
| 52 | ||
| 224c7076 A |
53 | fl.l_start = 0; |
| 54 | fl.l_len = size; | |
| 55 | fl.l_whence = SEEK_CUR; | |
| 56 | ||
| 57 | switch (function) { | |
| 58 | case F_ULOCK: | |
| 59 | cmd = F_SETLK; | |
| 60 | fl.l_type = F_UNLCK; | |
| 61 | break; | |
| 62 | case F_LOCK: | |
| 63 | cmd = F_SETLKW; | |
| 64 | fl.l_type = F_WRLCK; | |
| 65 | break; | |
| 66 | case F_TLOCK: | |
| 67 | cmd = F_SETLK; | |
| 68 | fl.l_type = F_WRLCK; | |
| 69 | break; | |
| 70 | case F_TEST: | |
| 71 | fl.l_type = F_WRLCK; | |
| 72 | #ifdef VARIANT_CANCELABLE | |
| 73 | if (__fcntl(filedes, F_GETLK, &fl) == -1) | |
| 74 | return (-1); | |
| 75 | #else /* !VARIANT_CANCELABLE */ | |
| 76 | if (__fcntl_nocancel(filedes, F_GETLK, &fl) == -1) | |
| 77 | return (-1); | |
| 78 | #endif /* VARIANT_CANCELABLE */ | |
| 79 | if (fl.l_type == F_UNLCK || fl.l_pid == getpid()) | |
| 80 | return (0); | |
| 81 | errno = EAGAIN; | |
| 82 | return (-1); | |
| 83 | /* NOTREACHED */ | |
| 84 | default: | |
| 85 | errno = EINVAL; | |
| 86 | return (-1); | |
| 87 | /* NOTREACHED */ | |
| 88 | } | |
| 89 | ||
| 90 | #ifdef VARIANT_CANCELABLE | |
| 1f2f436a | 91 | return (__fcntl(filedes, cmd, &fl)); |
| 224c7076 | 92 | #else /* !VARIANT_CANCELABLE */ |
| 1f2f436a | 93 | return (__fcntl_nocancel(filedes, cmd, &fl)); |
| 224c7076 A |
94 | #endif /* VARIANT_CANCELABLE */ |
| 95 | } | |
| 96 |