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-rw-r--r--util-linux/umount.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/util-linux/umount.c b/util-linux/umount.c
new file mode 100644
index 0000000..4efc9f9
--- /dev/null
+++ b/util-linux/umount.c
@@ -0,0 +1,135 @@
+#include "internal.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <sys/mount.h>
+
+const char umount_usage[] = "umount {filesystem|directory}\n"
+"\tumount -a\n"
+"\n"
+"\tUnmount a filesystem.\n"
+"\t-a:\tUnmounts all mounted filesystems.\n";
+
+static char *
+stralloc(const char * string)
+{
+ int length = strlen(string) + 1;
+ char * n = malloc(length);
+ memcpy(n, string, length);
+ return n;
+}
+
+extern void
+erase_mtab(const char * name)
+{
+ struct mntent entries[100];
+ int count = 0;
+ FILE * mountTable = setmntent("/etc/mtab", "r");
+ struct mntent * m;
+
+ if ( mountTable == 0
+ && (mountTable = setmntent("/proc/mounts", "r")) == 0 ) {
+ name_and_error("/etc/mtab");
+ return;
+ }
+
+ while ( (m = getmntent(mountTable)) != 0 ) {
+ entries[count].mnt_fsname = stralloc(m->mnt_fsname);
+ entries[count].mnt_dir = stralloc(m->mnt_dir);
+ entries[count].mnt_type = stralloc(m->mnt_type);
+ entries[count].mnt_opts = stralloc(m->mnt_opts);
+ entries[count].mnt_freq = m->mnt_freq;
+ entries[count].mnt_passno = m->mnt_passno;
+ count++;
+ }
+ endmntent(mountTable);
+ if ( (mountTable = setmntent("/etc/mtab", "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 )
+ name_and_error("/etc/mtab");
+}
+
+static int
+umount_all(int noMtab)
+{
+ struct mntent entries[100];
+ int count = 0;
+ FILE * mountTable = setmntent("/etc/mtab", "r");
+ struct mntent * m;
+ int status = 0;
+
+ if ( mountTable == 0
+ && (mountTable = setmntent("/proc/mounts", "r")) == 0 ) {
+ name_and_error("/etc/mtab");
+ return 1;
+ }
+
+ while ( (m = getmntent(mountTable)) != 0 ) {
+ entries[count].mnt_fsname = stralloc(m->mnt_fsname);
+ count++;
+ }
+ endmntent(mountTable);
+
+ while ( count > 0 ) {
+ int result = umount(entries[--count].mnt_fsname) == 0;
+ /* free(entries[count].mnt_fsname); */
+ if ( result ) {
+ if ( !noMtab )
+ erase_mtab(entries[count].mnt_fsname);
+ }
+ else {
+ status = 1;
+ name_and_error(entries[count].mnt_fsname);
+ }
+ }
+ return status;
+}
+
+extern int
+do_umount(const char * name, int noMtab)
+{
+ if ( umount(name) == 0 ) {
+ if ( !noMtab )
+ erase_mtab(name);
+ return 0;
+ }
+ return 1;
+}
+
+extern int
+umount_main(struct FileInfo * i, int argc, char * * argv)
+{
+ int noMtab = 0;
+
+ if ( argv[1][0] == '-' ) {
+ switch ( argv[1][1] ) {
+ case 'a':
+ return umount_all(noMtab);
+ case 'n':
+ noMtab = 1;
+ break;
+ default:
+ usage(umount_usage);
+ return 1;
+ }
+ }
+ if ( do_umount(argv[1],noMtab) != 0 ) {
+ fprintf(stderr, "%s: %s.\n", argv[1], strerror(errno));
+ return 1;
+ }
+ return 0;
+}