add -a flag umount

configs/rc.poweroff

@@ -1,9 +1,6 @@
 #!/bin/sh
 echo "Umounting..."
-umount /proc
-umount /sys
-umount /dev
-umount /tmp
+umount -a
 
 echo "Closing processes..."
 kill -a -s TERM

src/sysutils-linux/umount/umount.c

@@ -3,14 +3,42 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <mntent.h>
 #include <sys/mount.h>
+#include "config.h"
+
+int parse_fstab(unsigned long flag) {
+	FILE *fp = setmntent(MOUNT_CFG, "r");
+	if (fp == NULL) {
+		fprintf(stderr, "umount: %s\n", strerror(errno));
+		return 1;
+	}
+
+	struct mntent *me;
+
+	int ret = 0;
+	while ((me = getmntent(fp))) {
+		puts(me->mnt_dir);
+		if (umount2(me->mnt_dir, flag) < 0) {
+			fprintf(stderr, "umount: %s: %s\n", me->mnt_dir, strerror(errno));
+			ret = 1;
+		}
+
+	}
+
+	endmntent(fp);
+	return ret;
+}
 
 int main(int argc, char **argv) {
 	unsigned long flag = 0;
 
 	int opt;
-	while ((opt = getopt(argc, argv, "fl")) != -1) {
+	while ((opt = getopt(argc, argv, "afl")) != -1) {
 		switch (opt) {
+			case 'a':
+				return parse_fstab(flag);
+
 			case 'f':
 				flag |= MNT_FORCE;
 				break;
@@ -20,7 +48,7 @@ int main(int argc, char **argv) {
 				break;
 
 			default:
-				printf("umount [dst1 dst2...]\n\t[-f Force umount] [-l Lazy umount]\n");
+				printf("umount [dst1 dst2...]\n\t[-a Umount all]\n\t[-f Force umount] [-l Lazy umount]\n");
 				return 0;
 		}
 	}