diff options
Diffstat (limited to 'lib/libc/gen/devname.c')
| -rw-r--r-- | lib/libc/gen/devname.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/lib/libc/gen/devname.c b/lib/libc/gen/devname.c new file mode 100644 index 000000000000..e5cc9dfb8064 --- /dev/null +++ b/lib/libc/gen/devname.c @@ -0,0 +1,115 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/sysctl.h> + +#include <db.h> +#include <err.h> +#include <fcntl.h> +#include <paths.h> +#include <stdio.h> +#include <string.h> +#include <sys/param.h> +#include <sys/stat.h> + +static char * +xdevname(dev, type) + dev_t dev; + mode_t type; +{ + struct { + mode_t type; + dev_t dev; + } bkey; + static DB *db; + static int failure; + DBT data, key; + + if (!db && !failure && + !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) + failure = 1; + if (failure) + return (NULL); + + /* + * Keys are a mode_t followed by a dev_t. The former is the type of + * the file (mode & S_IFMT), the latter is the st_rdev field. Be + * sure to clear any padding that may be found in bkey. + */ + memset(&bkey, 0, sizeof(bkey)); + bkey.dev = dev; + bkey.type = type; + key.data = &bkey; + key.size = sizeof(bkey); + return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data); +} + +char * +devname(dev, type) + dev_t dev; + mode_t type; +{ + static char buf[SPECNAMELEN + 1]; + int i; + size_t j; + char *r; + + /* First check the DB file. */ + r = xdevname(dev, type); + if (r != NULL) + return (r); + + /* Then ask the kernel. */ + if ((type & S_IFMT) == S_IFCHR) { + j = sizeof(buf); + i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev)); + if (i == 0) + return (buf); + } + + /* Finally just format it */ + if (minor(dev) > 255) + r = "#%c:%d:0x%x"; + else + r = "#%c:%d:0x%d"; + snprintf(buf, SPECNAMELEN + 1, r, + (type & S_IFMT) == S_IFCHR ? 'C' : 'B', major(dev), minor(dev)); + return (buf); +} |