Home | History | Annotate | Line # | Download | only in fsck 
      1 /*	$NetBSD: openspecial.c,v 1.1 2026/05/01 20:39:26 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2026 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      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 __RCSID("$NetBSD: openspecial.c,v 1.1 2026/05/01 20:39:26 christos Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/param.h>
     37 #include <sys/stat.h>
     38 
     39 #include <err.h>
     40 #include <errno.h>
     41 #include <fcntl.h>
     42 #include <util.h>
     43 #include <unistd.h>
     44 #include <stdlib.h>
     45 #include <fstab.h>
     46 #include <string.h>
     47 
     48 #include "partutil.h"
     49 
     50 
     51 int
     52 openspecial(const char *special, int flags, char *device, size_t devsize,
     53     struct stat *sb)
     54 {
     55 	char specname[MAXPATHLEN], rawname[MAXPATHLEN];
     56 	const char *raw;
     57 	struct stat st;
     58 	struct fstab *fs;
     59 	int fd;
     60 
     61 	fs = getfsfile(special);
     62 	if (fs)
     63 		special = fs->fs_spec;
     64 
     65 	raw = getfsspecname(specname, sizeof(specname), special);
     66 	if (raw == NULL)
     67 		err(EXIT_FAILURE, "%s: %s", special, specname);
     68 
     69 	special = getdiskrawname(rawname, sizeof(rawname), raw);
     70 	if (special == NULL)
     71 		special = raw;
     72 
     73 	fd = opendisk(special, flags, device, devsize, 0);
     74 	if (sb == NULL)
     75 		sb = &st;
     76 
     77 	if (fd == -1 || fstat(fd, sb) == -1)
     78 		err(EXIT_FAILURE, "Can't open `%s'", special);
     79 
     80 	if (S_ISBLK(sb->st_mode))
     81 		errx(EXIT_FAILURE, "`%s' is a block device. use raw device",
     82 		    special);
     83 
     84 	return fd;
     85 }
     86