1 /* $NetBSD: lockf.c,v 1.1 1997/12/20 20:23:18 kleink Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 * 38 * $FreeBSD: src/lib/libc/gen/lockf.c,v 1.5 2000/01/27 23:06:17 jasone Exp $ 39 * $DragonFly: src/lib/libc/gen/lockf.c,v 1.3 2005/01/31 22:29:15 dillon Exp $ 40 */ 41 42 #include "namespace.h" 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <unistd.h> 46 #include "un-namespace.h" 47 48 int 49 lockf(filedes, function, size) 50 int filedes; 51 int function; 52 off_t size; 53 { 54 struct flock fl; 55 int cmd; 56 57 fl.l_start = 0; 58 fl.l_len = size; 59 fl.l_whence = SEEK_CUR; 60 61 switch (function) { 62 case F_ULOCK: 63 cmd = F_SETLK; 64 fl.l_type = F_UNLCK; 65 break; 66 case F_LOCK: 67 cmd = F_SETLKW; 68 fl.l_type = F_WRLCK; 69 break; 70 case F_TLOCK: 71 cmd = F_SETLK; 72 fl.l_type = F_WRLCK; 73 break; 74 case F_TEST: 75 fl.l_type = F_WRLCK; 76 if (_fcntl(filedes, F_GETLK, &fl) == -1) 77 return (-1); 78 if (fl.l_type == F_UNLCK || fl.l_pid == getpid()) 79 return (0); 80 errno = EAGAIN; 81 return (-1); 82 /* NOTREACHED */ 83 default: 84 errno = EINVAL; 85 return (-1); 86 /* NOTREACHED */ 87 } 88 89 return (_fcntl(filedes, cmd, &fl)); 90 } 91