| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | |
| 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 |