* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <stdio.h>
#include <mntent.h>
#include "libbb.h"
-#define MTAB_MAX_ENTRIES 40
-
-#ifdef CONFIG_FEATURE_MTAB_SUPPORT
-void erase_mtab(const char *name)
+#if ENABLE_FEATURE_MTAB_SUPPORT
+void FAST_FUNC erase_mtab(const char *name)
{
- struct mntent entries[MTAB_MAX_ENTRIES];
- int count = 0;
- FILE *mountTable = setmntent(bb_path_mtab_file, "r");
+ struct mntent *entries;
+ int i, count;
+ FILE *mountTable;
struct mntent *m;
- /* Check if reading the mtab file failed */
- if (mountTable == 0
- /* Bummer. fall back on trying the /proc filesystem */
- && (mountTable = setmntent("/proc/mounts", "r")) == 0) {
+ mountTable = setmntent(bb_path_mtab_file, "r");
+ /* Bummer. Fall back on trying the /proc filesystem */
+ if (!mountTable) mountTable = setmntent("/proc/mounts", "r");
+ if (!mountTable) {
bb_perror_msg(bb_path_mtab_file);
return;
}
- while (((m = getmntent(mountTable)) != 0) && (count < MTAB_MAX_ENTRIES))
- {
- entries[count].mnt_fsname = strdup(m->mnt_fsname);
- entries[count].mnt_dir = strdup(m->mnt_dir);
- entries[count].mnt_type = strdup(m->mnt_type);
- entries[count].mnt_opts = strdup(m->mnt_opts);
+ entries = NULL;
+ count = 0;
+ while ((m = getmntent(mountTable)) != 0) {
+ entries = xrealloc_vector(entries, 3, count);
+ entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
+ entries[count].mnt_dir = xstrdup(m->mnt_dir);
+ entries[count].mnt_type = xstrdup(m->mnt_type);
+ entries[count].mnt_opts = xstrdup(m->mnt_opts);
entries[count].mnt_freq = m->mnt_freq;
entries[count].mnt_passno = m->mnt_passno;
count++;
}
endmntent(mountTable);
- if ((mountTable = setmntent(bb_path_mtab_file, "w"))) {
- int i;
+//TODO: make update atomic
+ mountTable = setmntent(bb_path_mtab_file, "w");
+ if (mountTable) {
for (i = 0; i < count; i++) {
- int result = (strcmp(entries[i].mnt_fsname, name) == 0
- || strcmp(entries[i].mnt_dir, name) == 0);
-
- if (result)
- continue;
- else
+ if (strcmp(entries[i].mnt_fsname, name) != 0
+ && strcmp(entries[i].mnt_dir, name) != 0)
addmntent(mountTable, &entries[i]);
}
endmntent(mountTable);