usr/src/usr.sbin/dev_mkdb/dev_mkdb.c

/*-
 * Copyright (c) 1990 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.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)dev_mkdb.c  5.9 (Berkeley) 5/17/91";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#undef DIRBLKSIZ
#include <dirent.h>
#include <nlist.h>
#include <kvm.h>
#include <db.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>

void error(), usage();

main(argc, argv)
        int argc;
        char **argv;
{
        extern int optind;
        register DIR *dirp;
        register struct dirent *dp;
        struct stat sb;
        struct {
                mode_t type;
                dev_t dev;
        } bkey;
        DB *db;
        DBT data, key;
        int ch;
        u_char buf[MAXNAMLEN + 1];
        char dbtmp[MAXPATHLEN + 1], dbname[MAXPATHLEN + 1];

        while ((ch = getopt(argc, argv, "")) != EOF)
                switch((char)ch) {
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (chdir(_PATH_DEV))
                error(_PATH_DEV);

        dirp = opendir(".");

        (void)snprintf(dbtmp, sizeof(dbtmp), "%s/dev.tmp", _PATH_VARRUN);
        (void)snprintf(dbname, sizeof(dbtmp), "%s/dev.db", _PATH_VARRUN);
        db = hash_open(dbtmp, O_CREAT|O_WRONLY|O_EXCL, DEFFILEMODE,
            (HASHINFO *)NULL);
        if (!db)
                error(dbtmp);

        /*
         * 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.
         */
        key.data = &bkey;
        key.size = sizeof(bkey);
        data.data = buf;
        while (dp = readdir(dirp)) {
                if (stat(dp->d_name, &sb)) {
                        (void)fprintf(stderr, "dev_mkdb: can't stat %s\n",
                                dp->d_name);
                        continue;
                }

                /* Create the key. */
                if (S_ISCHR(sb.st_mode))
                        bkey.type = S_IFCHR;
                else if (S_ISBLK(sb.st_mode))
                        bkey.type = S_IFBLK;
                else
                        continue;
                bkey.dev = sb.st_rdev;

                /*
                 * Create the data; nul terminate the name so caller doesn't
                 * have to.
                 */
                bcopy(dp->d_name, buf, dp->d_namlen);
                buf[dp->d_namlen] = '\0';
                data.size = dp->d_namlen + 1;
                if ((db->put)(db, &key, &data, 0))
                        error(dbtmp);
        }
        (void)(db->close)(db);
        if (rename(dbtmp, dbname)) {
                (void)fprintf(stderr, "dev_mkdb: %s to %s: %s.\n",
                    dbtmp, dbname, strerror(errno));
                exit(1);
        }
        exit(0);
}

void
error(n)
        char *n;
{
        (void)fprintf(stderr, "dev_mkdb: %s: %s\n", n, strerror(errno));
        exit(1);
}

void
usage()
{
        (void)fprintf(stderr, "usage: dev_mkdb\n");
        exit(1);
}