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;
+}