1 /* $NetBSD: opendisk.c,v 1.6 1999/09/20 04:48:07 lukem 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 * 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) 41 __RCSID("$NetBSD: opendisk.c,v 1.6 1999/09/20 04:48:07 lukem Exp $"); 42 #endif 43 44 #include <sys/param.h> 45 46 #include <assert.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <util.h> 50 #include <paths.h> 51 #include <stdio.h> 52 #include <string.h> 53 54 int 55 opendisk(path, flags, buf, buflen, iscooked) 56 const char *path; 57 int flags; 58 char *buf; 59 size_t buflen; 60 int iscooked; 61 { 62 int f, rawpart; 63 64 65 if (buf == NULL) { 66 errno = EFAULT; 67 return (-1); 68 } 69 snprintf(buf, buflen, "%s", path); 70 71 if ((flags & O_CREAT) != 0) { 72 errno = EINVAL; 73 return (-1); 74 } 75 76 rawpart = getrawpartition(); 77 if (rawpart < 0) 78 return (-1); /* sysctl(3) in getrawpartition sets errno */ 79 80 f = open(buf, flags); 81 if (f != -1 || errno != ENOENT) 82 return (f); 83 84 snprintf(buf, buflen, "%s%c", path, 'a' + rawpart); 85 f = open(buf, flags); 86 if (f != -1 || errno != ENOENT) 87 return (f); 88 89 if (strchr(path, '/') != NULL) 90 return (-1); 91 92 snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path); 93 f = open(buf, flags); 94 if (f != -1 || errno != ENOENT) 95 return (f); 96 97 snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path, 98 'a' + rawpart); 99 f = open(buf, flags); 100 return (f); 101 } 102