| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | #include <mntent.h>
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| 11 | #include "libbb.h"
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| 12 |
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| 13 | #if ENABLE_FEATURE_MTAB_SUPPORT
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| 14 | void FAST_FUNC erase_mtab(const char *name)
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| 15 | {
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| 16 | struct mntent *entries;
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| 17 | int i, count;
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| 18 | FILE *mountTable;
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| 19 | struct mntent *m;
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| 20 |
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| 21 | mountTable = setmntent(bb_path_mtab_file, "r");
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| 22 | /* Bummer. Fall back on trying the /proc filesystem */
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| 23 | if (!mountTable) mountTable = setmntent("/proc/mounts", "r");
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| 24 | if (!mountTable) {
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| 25 | bb_perror_msg(bb_path_mtab_file);
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| 26 | return;
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| 27 | }
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| 28 |
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| 29 | entries = NULL;
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| 30 | count = 0;
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| 31 | while ((m = getmntent(mountTable)) != 0) {
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| 32 | entries = xrealloc_vector(entries, 3, count);
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| 33 | entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
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| 34 | entries[count].mnt_dir = xstrdup(m->mnt_dir);
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| 35 | entries[count].mnt_type = xstrdup(m->mnt_type);
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| 36 | entries[count].mnt_opts = xstrdup(m->mnt_opts);
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| 37 | entries[count].mnt_freq = m->mnt_freq;
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| 38 | entries[count].mnt_passno = m->mnt_passno;
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| 39 | count++;
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| 40 | }
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| 41 | endmntent(mountTable);
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| 42 |
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| 43 | //TODO: make update atomic
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| 44 | mountTable = setmntent(bb_path_mtab_file, "w");
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| 45 | if (mountTable) {
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| 46 | for (i = 0; i < count; i++) {
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| 47 | if (strcmp(entries[i].mnt_fsname, name) != 0
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| 48 | && strcmp(entries[i].mnt_dir, name) != 0)
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| 49 | addmntent(mountTable, &entries[i]);
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| 50 | }
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| 51 | endmntent(mountTable);
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| 52 | } else if (errno != EROFS)
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| 53 | bb_perror_msg(bb_path_mtab_file);
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| 54 | }
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| 55 | #endif
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