package/aufs2-util/src/proc_mnt.c

   1 /*
   2  * Copyright (C) 2005-2009 Junjiro Okajima
   3  *
   4  * This program, aufs is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <sys/types.h>
  20 #include <errno.h>
  21 #include <mntent.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include "au_util.h"
  27
  28 #define ProcMounts "/proc/self/mounts"
  29
  30 static void copy_ent(struct mntent *dst, struct mntent *src)
  31 {
  32         free(dst->mnt_opts);
  33         free(dst->mnt_type);
  34         free(dst->mnt_dir);
  35         free(dst->mnt_fsname);
  36
  37         dst->mnt_dir = NULL;
  38         dst->mnt_type = NULL;
  39         dst->mnt_opts = NULL;
  40
  41         dst->mnt_fsname = strdup(src->mnt_fsname);
  42         if (dst->mnt_fsname)
  43                 dst->mnt_dir = strdup(src->mnt_dir);
  44         if (dst->mnt_dir)
  45                 dst->mnt_type = strdup(src->mnt_type);
  46         if (dst->mnt_type)
  47                 dst->mnt_opts = strdup(src->mnt_opts);
  48         if (dst->mnt_opts) {
  49                 dst->mnt_freq = src->mnt_freq;
  50                 dst->mnt_passno = src->mnt_passno;
  51         } else
  52                 AuFin("strdup");
  53
  54 }
  55
  56 int au_proc_getmntent(char *mntpnt, struct mntent *rent)
  57 {
  58         int found;
  59         struct mntent *p;
  60         FILE *fp;
  61
  62         fp = setmntent(ProcMounts, "r");
  63         if (!fp)
  64                 AuFin(ProcMounts);
  65
  66         /* find the last one */
  67         memset(rent, 0, sizeof(*rent));
  68         found = 0;
  69         while ((p = getmntent(fp)))
  70                 if (!strcmp(p->mnt_dir, mntpnt)) {
  71                         Dpri("%s, %s, %s, %s, %d, %d\n",
  72                              p->mnt_fsname, p->mnt_dir, p->mnt_type,
  73                              p->mnt_opts, p->mnt_freq, p->mnt_passno);
  74                         copy_ent(rent, p);
  75                         found = 1;
  76                 }
  77         endmntent(fp);
  78
  79         if (!found) {
  80                 errno = EINVAL;
  81                 AuFin("%s", mntpnt);
  82         }
  83
  84         return 0;
  85 }