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Diffstat (limited to 'libbb/mtab.c')
-rw-r--r--libbb/mtab.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/libbb/mtab.c b/libbb/mtab.c
new file mode 100644
index 0000000..28c9978
--- /dev/null
+++ b/libbb/mtab.c
@@ -0,0 +1,95 @@
+/* vi: set sw=4 ts=4: */
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <mntent.h>
+#include "libbb.h"
+
+extern const char mtab_file[]; /* Defined in utility.c */
+static const int MS_RDONLY = 1; /* Mount read-only. */
+
+void erase_mtab(const char *name)
+{
+ struct mntent entries[20];
+ int count = 0;
+ FILE *mountTable = setmntent(mtab_file, "r");
+ 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) {
+ perror_msg("%s", mtab_file);
+ return;
+ }
+
+ while ((m = getmntent(mountTable)) != 0) {
+ 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[count].mnt_freq = m->mnt_freq;
+ entries[count].mnt_passno = m->mnt_passno;
+ count++;
+ }
+ endmntent(mountTable);
+ if ((mountTable = setmntent(mtab_file, "w"))) {
+ int i;
+
+ 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
+ addmntent(mountTable, &entries[i]);
+ }
+ endmntent(mountTable);
+ } else if (errno != EROFS)
+ perror_msg("%s", mtab_file);
+}
+
+void write_mtab(char *blockDevice, char *directory,
+ char *filesystemType, long flags, char *string_flags)
+{
+ FILE *mountTable = setmntent(mtab_file, "a+");
+ struct mntent m;
+
+ if (mountTable == 0) {
+ perror_msg("%s", mtab_file);
+ return;
+ }
+ if (mountTable) {
+ int length = strlen(directory);
+
+ if (length > 1 && directory[length - 1] == '/')
+ directory[length - 1] = '\0';
+
+ if (filesystemType == 0) {
+ struct mntent *p = find_mount_point(blockDevice, "/proc/mounts");
+
+ if (p && p->mnt_type)
+ filesystemType = p->mnt_type;
+ }
+ m.mnt_fsname = blockDevice;
+ m.mnt_dir = directory;
+ m.mnt_type = filesystemType ? filesystemType : "default";
+
+ if (*string_flags) {
+ m.mnt_opts = string_flags;
+ } else {
+ if ((flags | MS_RDONLY) == flags)
+ m.mnt_opts = "ro";
+ else
+ m.mnt_opts = "rw";
+ }
+
+ m.mnt_freq = 0;
+ m.mnt_passno = 0;
+ addmntent(mountTable, &m);
+ endmntent(mountTable);
+ }
+}