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 tarball for details.
   8 */
   9
  10#include <mntent.h>
  11#include "libbb.h"
  12
  13#if ENABLE_FEATURE_MTAB_SUPPORT
  14void 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
  56