define new library function getgrouplist

[unix-history] / usr / src / lib / libc / gen / devname.c

/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)devname.c   5.15 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <db.h>
#include <stdio.h>
#include <paths.h>

char *
devname(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))) {
               (void)fprintf(stderr,
                   "warning: %s: %s\n", _PATH_DEVDB, strerror(errno));
               failure = 1;
       }
       if (failure)
               return("??");

       /*
        * 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.
        */
       bkey.dev = dev;
       bkey.type = type;
       key.data = &bkey;
       key.size = sizeof(bkey);
       return((db->get)(db, &key, &data, 0L) ? "??" : (char *)data.data);
}