libbb/mtab.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9 #include <mntent.h>
  10 #include "libbb.h"
  11
  12 #if ENABLE_FEATURE_MTAB_SUPPORT
  13 void FAST_FUNC erase_mtab(const char *name)
  14 {
  15         struct mntent *entries;
  16         int i, count;
  17         FILE *mountTable;
  18         struct mntent *m;
  19
  20         mountTable = setmntent(bb_path_mtab_file, "r");
  21         /* Bummer. Fall back on trying the /proc filesystem */
  22         if (!mountTable) mountTable = setmntent("/proc/mounts", "r");
  23         if (!mountTable) {
  24                 bb_simple_perror_msg(bb_path_mtab_file);
  25                 return;
  26         }
  27
  28         entries = NULL;
  29         count = 0;
  30         while ((m = getmntent(mountTable)) != 0) {
  31                 entries = xrealloc_vector(entries, 3, count);
  32                 entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
  33                 entries[count].mnt_dir = xstrdup(m->mnt_dir);
  34                 entries[count].mnt_type = xstrdup(m->mnt_type);
  35                 entries[count].mnt_opts = xstrdup(m->mnt_opts);
  36                 entries[count].mnt_freq = m->mnt_freq;
  37                 entries[count].mnt_passno = m->mnt_passno;
  38                 count++;
  39         }
  40         endmntent(mountTable);
  41
  42 //TODO: make update atomic
  43         mountTable = setmntent(bb_path_mtab_file, "w");
  44         if (mountTable) {
  45                 for (i = 0; i < count; i++) {
  46                         if (strcmp(entries[i].mnt_fsname, name) != 0
  47                          && strcmp(entries[i].mnt_dir, name) != 0)
  48                                 addmntent(mountTable, &entries[i]);
  49                 }
  50                 endmntent(mountTable);
  51         } else if (errno != EROFS)
  52                 bb_simple_perror_msg(bb_path_mtab_file);
  53 }
  54 #endif