b3bf0bffe1
if zero, a matching path must be of type S_IFCHR, and if non-zero, a matching path must be of type S_IFBLK.
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* $NetBSD: opendisk.c,v 1.8 2001/11/01 06:53:25 lukem Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: opendisk.c,v 1.8 2001/11/01 06:53:25 lukem Exp $");
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#endif
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#include <sys/param.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <util.h>
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int
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opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
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{
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struct stat sb;
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int f, pass, rawpart, serrno;
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if (buf == NULL) {
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errno = EFAULT;
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return (-1);
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}
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if ((flags & O_CREAT) != 0) {
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errno = EINVAL;
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return (-1);
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}
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rawpart = getrawpartition();
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if (rawpart < 0)
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return (-1); /* sysctl(3) in getrawpartition sets errno */
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for (pass = 0; pass < 4; pass++) {
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switch (pass) {
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case 0:
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snprintf(buf, buflen, "%s", path);
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break;
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case 1:
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snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
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break;
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case 2:
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if (strchr(path, '/') != NULL)
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return (-1);
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snprintf(buf, buflen, "%s%s%s", _PATH_DEV,
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iscooked ? "" : "r", path);
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break;
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case 3:
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snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV,
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iscooked ? "" : "r", path, 'a' + rawpart);
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break;
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}
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f = open(buf, flags);
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if (f == -1 && errno != ENOENT)
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return (-1);
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if (f != -1) {
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if (fstat(f, &sb) == -1) {
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serrno = errno;
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close (f);
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errno = serrno;
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f = -1;
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} else if ((!iscooked && !S_ISCHR(sb.st_mode)) ||
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( iscooked && !S_ISBLK(sb.st_mode)) ) {
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close (f);
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errno = ENODEV;
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f = -1;
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}
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return (f);
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}
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}
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return (f);
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}
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