1 /* $NetBSD: opendisk.c,v 1.8 2001/11/01 06:53:25 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 1.8 2001/11/01 06:53:25 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 <paths.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include <util.h> 54 55 int 56 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked) 57 { 58 struct stat sb; 59 int f, pass, rawpart, serrno; 60 61 if (buf == NULL) { 62 errno = EFAULT; 63 return (-1); 64 } 65 if ((flags & O_CREAT) != 0) { 66 errno = EINVAL; 67 return (-1); 68 } 69 70 rawpart = getrawpartition(); 71 if (rawpart < 0) 72 return (-1); /* sysctl(3) in getrawpartition sets errno */ 73 74 for (pass = 0; pass < 4; pass++) { 75 switch (pass) { 76 case 0: 77 snprintf(buf, buflen, "%s", path); 78 break; 79 case 1: 80 snprintf(buf, buflen, "%s%c", path, 'a' + rawpart); 81 break; 82 case 2: 83 if (strchr(path, '/') != NULL) 84 return (-1); 85 snprintf(buf, buflen, "%s%s%s", _PATH_DEV, 86 iscooked ? "" : "r", path); 87 break; 88 case 3: 89 snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, 90 iscooked ? "" : "r", path, 'a' + rawpart); 91 break; 92 } 93 f = open(buf, flags); 94 if (f == -1 && errno != ENOENT) 95 return (-1); 96 if (f != -1) { 97 if (fstat(f, &sb) == -1) { 98 serrno = errno; 99 close (f); 100 errno = serrno; 101 f = -1; 102 } else if ((!iscooked && !S_ISCHR(sb.st_mode)) || 103 ( iscooked && !S_ISBLK(sb.st_mode)) ) { 104 close (f); 105 errno = ENODEV; 106 f = -1; 107 } 108 return (f); 109 } 110 } 111 return (f); 112 } 113