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-rw-r--r--busybox/libbb/mtab.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/busybox/libbb/mtab.c b/busybox/libbb/mtab.c
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index 000000000..b1f74c476
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+++ b/busybox/libbb/mtab.c
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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 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <stdlib.h>
23#include <unistd.h>
24#include <errno.h>
25#include <string.h>
26#include <stdio.h>
27#include <mntent.h>
28#include "libbb.h"
29
30#define MTAB_MAX_ENTRIES 40
31static const int MS_RDONLY = 1; /* Mount read-only. */
32
33void erase_mtab(const char *name)
34{
35 struct mntent entries[MTAB_MAX_ENTRIES];
36 int count = 0;
37 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
38 struct mntent *m;
39
40 /* Check if reading the mtab file failed */
41 if (mountTable == 0
42 /* Bummer. fall back on trying the /proc filesystem */
43 && (mountTable = setmntent("/proc/mounts", "r")) == 0) {
44 bb_perror_msg(bb_path_mtab_file);
45 return;
46 }
47
48 while (((m = getmntent(mountTable)) != 0) && (count < MTAB_MAX_ENTRIES))
49 {
50 entries[count].mnt_fsname = strdup(m->mnt_fsname);
51 entries[count].mnt_dir = strdup(m->mnt_dir);
52 entries[count].mnt_type = strdup(m->mnt_type);
53 entries[count].mnt_opts = strdup(m->mnt_opts);
54 entries[count].mnt_freq = m->mnt_freq;
55 entries[count].mnt_passno = m->mnt_passno;
56 count++;
57 }
58 endmntent(mountTable);
59 if ((mountTable = setmntent(bb_path_mtab_file, "w"))) {
60 int i;
61
62 for (i = 0; i < count; i++) {
63 int result = (strcmp(entries[i].mnt_fsname, name) == 0
64 || strcmp(entries[i].mnt_dir, name) == 0);
65
66 if (result)
67 continue;
68 else
69 addmntent(mountTable, &entries[i]);
70 }
71 endmntent(mountTable);
72 } else if (errno != EROFS)
73 bb_perror_msg(bb_path_mtab_file);
74}
75
76void write_mtab(char *blockDevice, char *directory,
77 char *filesystemType, long flags, char *string_flags)
78{
79 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
80 struct mntent m;
81
82 if (mountTable == 0) {
83 bb_perror_msg(bb_path_mtab_file);
84 return;
85 }
86 if (mountTable) {
87 int length = strlen(directory);
88
89 if (length > 1 && directory[length - 1] == '/')
90 directory[length - 1] = '\0';
91
92 if (filesystemType == 0) {
93 struct mntent *p = find_mount_point(blockDevice, "/proc/mounts");
94
95 if (p && p->mnt_type)
96 filesystemType = p->mnt_type;
97 }
98 m.mnt_fsname = blockDevice;
99 m.mnt_dir = directory;
100 m.mnt_type = filesystemType ? filesystemType : "default";
101
102 if (*string_flags) {
103 m.mnt_opts = string_flags;
104 } else {
105 if ((flags | MS_RDONLY) == flags)
106 m.mnt_opts = "ro";
107 else
108 m.mnt_opts = "rw";
109 }
110
111 m.mnt_freq = 0;
112 m.mnt_passno = 0;
113 addmntent(mountTable, &m);
114 endmntent(mountTable);
115 }
116}