116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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 University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <db.h>
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#include <err.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 <sys/param.h>
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#include <sys/stat.h>
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static char *
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xdevname(dev, type)
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dev_t dev;
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mode_t type;
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{
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struct {
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mode_t type;
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dev_t dev;
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} bkey;
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static DB *db;
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static int failure;
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DBT data, key;
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if (!db && !failure &&
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!(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)))
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failure = 1;
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if (failure)
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return (NULL);
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/*
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* Keys are a mode_t followed by a dev_t. The former is the type of
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* the file (mode & S_IFMT), the latter is the st_rdev field. Be
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* sure to clear any padding that may be found in bkey.
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*/
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memset(&bkey, 0, sizeof(bkey));
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bkey.dev = dev;
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bkey.type = type;
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key.data = &bkey;
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key.size = sizeof(bkey);
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return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data);
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}
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char *
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devname(dev, type)
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dev_t dev;
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mode_t type;
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{
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static char buf[SPECNAMELEN + 1];
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int i;
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size_t j;
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char *r;
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/* First check the DB file. */
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r = xdevname(dev, type);
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if (r != NULL)
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return (r);
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/* Then ask the kernel. */
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if ((type & S_IFMT) == S_IFCHR) {
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j = sizeof(buf);
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i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev));
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if (i == 0)
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return (buf);
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}
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/* Finally just format it */
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if (minor(dev) > 255)
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r = "#%c:%d:0x%x";
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else
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r = "#%c:%d:0x%d";
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snprintf(buf, SPECNAMELEN + 1, r,
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(type & S_IFMT) == S_IFCHR ? 'C' : 'B', major(dev), minor(dev));
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return (buf);
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}
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