1 /* $NetBSD: opendisk.c,v 1.10 2008/04/28 20:23:03 martin 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 Luke Mewburn. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 __RCSID("$NetBSD: opendisk.c,v 1.10 2008/04/28 20:23:03 martin Exp $"); 35 #endif 36 37 #include <sys/param.h> 38 39 #include <assert.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <util.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <string.h> 46 47 int 48 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked) 49 { 50 int f, rawpart; 51 52 if (buf == NULL) { 53 errno = EFAULT; 54 return (-1); 55 } 56 snprintf(buf, buflen, "%s", path); 57 58 if ((flags & O_CREAT) != 0) { 59 errno = EINVAL; 60 return (-1); 61 } 62 63 rawpart = getrawpartition(); 64 if (rawpart < 0) 65 return (-1); /* sysctl(3) in getrawpartition sets errno */ 66 67 f = open(buf, flags); 68 if (f != -1 || errno != ENOENT) 69 return (f); 70 71 snprintf(buf, buflen, "%s%c", path, 'a' + rawpart); 72 f = open(buf, flags); 73 if (f != -1 || errno != ENOENT) 74 return (f); 75 76 if (strchr(path, '/') != NULL) 77 return (-1); 78 79 snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path); 80 f = open(buf, flags); 81 if (f != -1 || errno != ENOENT) 82 return (f); 83 84 snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path, 85 'a' + rawpart); 86 f = open(buf, flags); 87 return (f); 88 } 89