feat: port lua scripting language

programs/include/libc/sys/stat.h

@@ -3,14 +3,23 @@
 
 #pragma once
 
-#include <stddef.h>
+#include <sys/types.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#define S_IFMT  0170000
+#define S_IFDIR 0040000
+#define S_IFREG 0100000
+
+#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
+#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
+
 struct stat {
+    mode_t        st_mode;
     unsigned long st_size;
+    time_t        st_mtime;
 };
 
 int mkdir(const char *path, unsigned int mode);

programs/include/libc/sys/time.h

@@ -17,6 +17,8 @@ struct timezone {
     int tz_dsttime;
 };
 
+int gettimeofday(struct timeval *tv, struct timezone *tz);
+
 #ifdef __cplusplus
 }
 #endif