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opendisk.c revision 1.10.8.2 
      1  1.10.8.2  martin /*	$NetBSD: opendisk.c,v 1.10.8.2 2008/04/28 20:23:04 martin Exp $	*/
      2  1.10.8.2  martin 
      3  1.10.8.2  martin /*-
      4  1.10.8.2  martin  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      5  1.10.8.2  martin  * All rights reserved.
      6  1.10.8.2  martin  *
      7  1.10.8.2  martin  * This code is derived from software contributed to The NetBSD Foundation
      8  1.10.8.2  martin  * by Luke Mewburn.
      9  1.10.8.2  martin  *
     10  1.10.8.2  martin  * Redistribution and use in source and binary forms, with or without
     11  1.10.8.2  martin  * modification, are permitted provided that the following conditions
     12  1.10.8.2  martin  * are met:
     13  1.10.8.2  martin  * 1. Redistributions of source code must retain the above copyright
     14  1.10.8.2  martin  *    notice, this list of conditions and the following disclaimer.
     15  1.10.8.2  martin  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.10.8.2  martin  *    notice, this list of conditions and the following disclaimer in the
     17  1.10.8.2  martin  *    documentation and/or other materials provided with the distribution.
     18  1.10.8.2  martin  *
     19  1.10.8.2  martin  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.10.8.2  martin  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.10.8.2  martin  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.10.8.2  martin  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.10.8.2  martin  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.10.8.2  martin  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.10.8.2  martin  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.10.8.2  martin  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.10.8.2  martin  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.10.8.2  martin  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.10.8.2  martin  * POSSIBILITY OF SUCH DAMAGE.
     30  1.10.8.2  martin  */
     31  1.10.8.2  martin 
     32  1.10.8.2  martin #include <sys/cdefs.h>
     33  1.10.8.2  martin #if defined(LIBC_SCCS) && !defined(lint)
     34  1.10.8.2  martin __RCSID("$NetBSD: opendisk.c,v 1.10.8.2 2008/04/28 20:23:04 martin Exp $");
     35  1.10.8.2  martin #endif
     36  1.10.8.2  martin 
     37  1.10.8.2  martin #include <sys/param.h>
     38  1.10.8.2  martin 
     39  1.10.8.2  martin #include <assert.h>
     40  1.10.8.2  martin #include <errno.h>
     41  1.10.8.2  martin #include <fcntl.h>
     42  1.10.8.2  martin #include <util.h>
     43  1.10.8.2  martin #include <paths.h>
     44  1.10.8.2  martin #include <stdio.h>
     45  1.10.8.2  martin #include <string.h>
     46  1.10.8.2  martin 
     47  1.10.8.2  martin int
     48  1.10.8.2  martin opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
     49  1.10.8.2  martin {
     50  1.10.8.2  martin 	int f, rawpart;
     51  1.10.8.2  martin 
     52  1.10.8.2  martin 	if (buf == NULL) {
     53  1.10.8.2  martin 		errno = EFAULT;
     54  1.10.8.2  martin 		return (-1);
     55  1.10.8.2  martin 	}
     56  1.10.8.2  martin 	snprintf(buf, buflen, "%s", path);
     57  1.10.8.2  martin 
     58  1.10.8.2  martin 	if ((flags & O_CREAT) != 0) {
     59  1.10.8.2  martin 		errno = EINVAL;
     60  1.10.8.2  martin 		return (-1);
     61  1.10.8.2  martin 	}
     62  1.10.8.2  martin 
     63  1.10.8.2  martin 	rawpart = getrawpartition();
     64  1.10.8.2  martin 	if (rawpart < 0)
     65  1.10.8.2  martin 		return (-1);	/* sysctl(3) in getrawpartition sets errno */
     66  1.10.8.2  martin 
     67  1.10.8.2  martin 	f = open(buf, flags);
     68  1.10.8.2  martin 	if (f != -1 || errno != ENOENT)
     69  1.10.8.2  martin 		return (f);
     70  1.10.8.2  martin 
     71  1.10.8.2  martin 	snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
     72  1.10.8.2  martin 	f = open(buf, flags);
     73  1.10.8.2  martin 	if (f != -1 || errno != ENOENT)
     74  1.10.8.2  martin 		return (f);
     75  1.10.8.2  martin 
     76  1.10.8.2  martin 	if (strchr(path, '/') != NULL)
     77  1.10.8.2  martin 		return (-1);
     78  1.10.8.2  martin 
     79  1.10.8.2  martin 	snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
     80  1.10.8.2  martin 	f = open(buf, flags);
     81  1.10.8.2  martin 	if (f != -1 || errno != ENOENT)
     82  1.10.8.2  martin 		return (f);
     83  1.10.8.2  martin 
     84  1.10.8.2  martin 	snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
     85  1.10.8.2  martin 	    'a' + rawpart);
     86  1.10.8.2  martin 	f = open(buf, flags);
     87  1.10.8.2  martin 	return (f);
     88  1.10.8.2  martin }
     89