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Annotation of src/lib/libc/gen/lockf.c, Revision 1.2

1.2     ! mycroft     1: /*     $NetBSD: lockf.c,v 1.1 1997/12/20 20:23:18 kleink Exp $ */
1.1       kleink      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:
                     39: #include <sys/cdefs.h>
                     40: #if defined(LIBC_SCCS) && !defined(lint)
1.2     ! mycroft    41: __RCSID("$NetBSD: lockf.c,v 1.1 1997/12/20 20:23:18 kleink Exp $");
1.1       kleink     42: #endif
                     43:
                     44: #include "namespace.h"
                     45: #include <errno.h>
                     46: #include <fcntl.h>
                     47: #include <unistd.h>
                     48:
                     49: #ifdef __weak_alias
1.2     ! mycroft    50: __weak_alias(lockf,_lockf)
1.1       kleink     51: #endif
                     52:
                     53:
                     54: int
                     55: lockf(filedes, function, size)
                     56:        int filedes;
                     57:        int function;
                     58:        off_t size;
                     59: {
                     60:        struct flock fl;
                     61:        int cmd;
                     62:
                     63:        fl.l_start = 0;
                     64:        fl.l_len = size;
                     65:        fl.l_whence = SEEK_CUR;
                     66:
                     67:        switch (function) {
                     68:        case F_ULOCK:
                     69:                cmd = F_SETLK;
                     70:                fl.l_type = F_UNLCK;
                     71:                break;
                     72:        case F_LOCK:
                     73:                cmd = F_SETLKW;
                     74:                fl.l_type = F_WRLCK;
                     75:                break;
                     76:        case F_TLOCK:
                     77:                cmd = F_SETLK;
                     78:                fl.l_type = F_WRLCK;
                     79:                break;
                     80:        case F_TEST:
                     81:                fl.l_type = F_WRLCK;
                     82:                if (fcntl(filedes, F_GETLK, &fl) == -1)
                     83:                        return (-1);
                     84:                if (fl.l_type == F_UNLCK || fl.l_pid == getpid())
                     85:                        return (0);
                     86:                errno = EAGAIN;
                     87:                return (-1);
                     88:                /* NOTREACHED */
                     89:        default:
                     90:                errno = EINVAL;
                     91:                return (-1);
                     92:                /* NOTREACHED */
                     93:        }
                     94:
                     95:        return (fcntl(filedes, cmd, &fl));
                     96: }

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