LXR busybox/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
  13void 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
  55