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 tarball for details.
   8  */
   9
  10 #include <mntent.h>
  11 #include "libbb.h"
  12
  13 #if ENABLE_FEATURE_MTAB_SUPPORT
  14 void FAST_FUNC erase_mtab(const char *name)
  15 {
  16         struct mntent *entries;
  17         int i, count;
  18         FILE *mountTable;
  19         struct mntent *m;
  20
  21         mountTable = setmntent(bb_path_mtab_file, "r");
  22         /* Bummer. Fall back on trying the /proc filesystem */
  23         if (!mountTable) mountTable = setmntent("/proc/mounts", "r");
  24         if (!mountTable) {
  25                 bb_perror_msg(bb_path_mtab_file);
  26                 return;
  27         }
  28
  29         entries = NULL;
  30         count = 0;
  31         while ((m = getmntent(mountTable)) != 0) {
  32                 entries = xrealloc_vector(entries, 3, count);
  33                 entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
  34                 entries[count].mnt_dir = xstrdup(m->mnt_dir);
  35                 entries[count].mnt_type = xstrdup(m->mnt_type);
  36                 entries[count].mnt_opts = xstrdup(m->mnt_opts);
  37                 entries[count].mnt_freq = m->mnt_freq;
  38                 entries[count].mnt_passno = m->mnt_passno;
  39                 count++;
  40         }
  41         endmntent(mountTable);
  42
  43 //TODO: make update atomic
  44         mountTable = setmntent(bb_path_mtab_file, "w");
  45         if (mountTable) {
  46                 for (i = 0; i < count; i++) {
  47                         if (strcmp(entries[i].mnt_fsname, name) != 0
  48                          && strcmp(entries[i].mnt_dir, name) != 0)
  49                                 addmntent(mountTable, &entries[i]);
  50                 }
  51                 endmntent(mountTable);
  52         } else if (errno != EROFS)
  53                 bb_perror_msg(bb_path_mtab_file);
  54 }
  55 #endif