1 /* $OpenBSD: opendisk.c,v 1.7 2014/06/30 00:26:22 deraadt Exp $ */ 2 /* $NetBSD: opendisk.c,v 1.4 1997/09/30 17:13:50 phil Exp $ */ 3 4 /*- 5 * Copyright (c) 1997 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Luke Mewburn. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/types.h> 34 35 #include <errno.h> 36 #include <fcntl.h> 37 #include <paths.h> 38 #include <stdio.h> 39 #include <string.h> 40 41 #include "util.h" 42 43 int 44 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked) 45 { 46 int f, rawpart; 47 48 snprintf(buf, buflen, "%s", path); 49 50 if ((flags & O_CREAT) != 0) { 51 errno = EINVAL; 52 return (-1); 53 } 54 55 rawpart = getrawpartition(); 56 if (rawpart < 0) 57 return (-1); /* sysctl(3) in getrawpartition sets errno */ 58 59 f = open(buf, flags); 60 if (f != -1 || errno != ENOENT) 61 return (f); 62 63 snprintf(buf, buflen, "%s%c", path, 'a' + rawpart); 64 f = open(buf, flags); 65 if (f != -1 || errno != ENOENT) 66 return (f); 67 68 if (strchr(path, '/') != NULL) 69 return (-1); 70 71 snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path); 72 f = open(buf, flags); 73 if (f != -1 || errno != ENOENT) 74 return (f); 75 76 snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path, 77 'a' + rawpart); 78 f = open(buf, flags); 79 return (f); 80 } 81