Implement passing commandline strings

libu/system.h

@@ -47,7 +47,7 @@ void* argument_ptr(void);
 int device_do(const char* device_key, int cmd, void* a1, void* a2, void* a3, void* a4);
 
 /* Run external ELF program */
-int exec(const char* volume, const char* path);
+int exec(const char* volume, const char* path, const char* cmdline);
 
 /* Open a file */
 int volume_open(const char* volume);
@@ -133,4 +133,7 @@ int volume_delete(const char* key);
 /* Get date-time */
 int date_time(struct date_time* dt);
 
+/* Get commandline string */
+const char* get_cmdline(void);
+
 #endif // _LIBMSL_M_SYSTEM_H