diff --git a/src/include/stdio.h b/src/include/stdio.h
index 3ea8373ffa65abf507806672f461e0b814d17c73..6eade0e19e90428ea8124495726a99c63e1abd44 100644
--- a/src/include/stdio.h
+++ b/src/include/stdio.h
@@ -1,7 +1,12 @@
+/*
+ * Xlibc implements for stdio
+ */
+
 #ifndef _STDIO_H
 #define _STDIO_H
 
 #include <features.h>
+#include <stdarg.h>
 
 #include <nxbase.h> // NX_Printf
 
@@ -11,6 +16,166 @@ extern "C" {
 
 #define printf(...) NX_Printf(__VA_ARGS__)
 
+// Predefined 
+typedef unsigned long long __STDIO_U64_;
+typedef unsigned long      __STDIO_U32_;
+
+#ifdef __SYS_64__
+    typedef __STDIO_U64_  __FILE_INT_T;
+#else
+    typedef __STDIO_U32_  __FILE_INT_T;
+#endif
+
+// Standard types 
+
+#ifndef __TYPE_SIZE_DEFINED
+    #ifdef __SYS_64__
+        typedef __STDIO_U64_ size_t;
+        #define _MAX_SIZE (0xffffffffffffffffull)
+    #else
+        typedef __STDIO_U32_ size_t;
+        #define _MAX_SIZE (0xffffffff)
+    #endif
+    #define __TYPE_SIZE_DEFINED
+#endif
+
+#ifndef _FILE_DEFINED
+    // FILE stream type 
+    typedef __FILE_INT_T FILE;
+    #define _FILE_DEFINED
+#endif
+
+#ifdef __SYS_64__
+    // fpos_t
+    typedef __STDIO_U64_  fpos_t;
+#else
+    typedef __STDIO_U32_  fpos_t;
+#endif
+
+
+// End of file 
+#define	EOF	 (-1)  // End of file
+
+
+// FILE seek modes 
+#define SEEK_SET  0  // Seek file stream from its start
+#define SEEK_CUR  1  // Seek file stream from current location
+#define SEEK_END  2  // Seek file stream from its end
+
+
+// Standard FILE stream number 
+#define	STDIN_FILENO    0   // Standard input stream number
+#define	STDOUT_FILENO   1   // Standard output stream number
+#define	STDERR_FILENO   2   // Standard error output stream number
+
+
+// The size of the buffer used by the `setbuf` function 
+#ifdef __BUFSIZ__
+#define	BUFSIZ  __BUFSIZ__
+#else
+#define	BUFSIZ  1024
+#endif
+
+
+// The maximum number of files a process can open together 
+#ifdef __FOPEN_MAX__
+#define FOPEN_MAX  __FOPEN_MAX__
+#else
+#define	FOPEN_MAX  20
+#endif
+
+
+// The maximum length of file path string 
+#ifdef __FILENAME_MAX__
+#define FILENAME_MAX  __FILENAME_MAX__
+#else
+#define	FILENAME_MAX  1024
+#endif
+
+
+// The maximum number of the names that `tmpnam` function can generate 
+#define TMP_MAX       32767
+
+
+// The maximum length of filename generated by `tmpnam` 
+#ifdef __L_tmpnam__
+#define L_tmpnam  __L_tmpnam__
+#else
+#define L_tmpnam  FILENAME_MAX
+#endif
+
+
+// NULL pointer define 
+#ifndef NULL
+    #ifdef __cplusplus
+        #define NULL 0
+    #else
+        #define NULL ((void *)0)
+    #endif
+#endif
+
+
+// `setvbuf` options 
+#define	_IOFBF    0    // Let `setvbuf` function set fully buffered
+#define	_IOLBF    1    // Let `setvbuf` function set line buffered
+#define	_IONBF    2    // Let `setvbuf` function set unbuffered
+
+
+// `stdin`, `stdout` and `stderr`
+extern const __FILE_INT_T __FILE_STDIN_;
+extern const __FILE_INT_T __FILE_STDOUT_;
+extern const __FILE_INT_T __FILE_STDERR_;
+
+
+extern const FILE *stdin;
+extern const FILE *stdout;
+extern const FILE *stderr;
+
+
+extern int      fclose     (FILE *stream);
+extern void     clearerr   (FILE *stream);
+extern int      feof       (FILE *stream);
+extern int      ferror     (FILE *stream);
+extern int      fflush     (FILE *stream);
+extern int      fgetpos    (FILE *stream, fpos_t *pos);
+extern FILE    *fopen      (const char *filename, const char *mode);
+extern size_t   fread      (void *ptr, size_t size, size_t nmemb, FILE *stream);
+extern FILE    *freopen    (const char *filename, const char *mode, FILE *stream);
+extern int      fseek      (FILE *stream, long int offset, int whence);
+extern int      fsetpos    (FILE *stream, const fpos_t *pos);
+extern long int ftell      (FILE *stream);
+extern size_t   fwrite     (const void *ptr, size_t size, size_t nmemb, FILE *stream);
+extern int      remove     (const char *filename);
+extern int      rename     (const char *old_filename, const char *new_filename);
+extern void     rewind     (FILE *stream);
+extern void     setbuf     (FILE *stream, char *buffer);
+extern int      setvbuf    (FILE *stream, char *buffer, int mode, size_t size);
+extern FILE    *tmpfile    (void);
+extern char    *tmpnam     (char *str);
+extern int      fprintf    (FILE *stream, const char *format, ...);
+// extern int      printf     (const char *format, ...);
+extern int      sprintf    (char *str, const char *format, ...);
+extern int      vfprintf   (FILE *stream, const char *format, va_list arg);
+extern int      vprintf    (const char *format, va_list arg);
+extern int      vsprintf   (char *str, const char *format, va_list arg);
+extern int      fscanf     (FILE *stream, const char *format, ...);
+extern int      scanf      (const char *format, ...);
+extern int      sscanf     (const char *str, const char *format, ...);
+extern int      fgetc      (FILE *stream);
+extern char    *fgets      (char *str, int n, FILE *stream);
+extern int      fputc      (int ch, FILE *stream);
+extern int      fputs      (const char *str, FILE *stream);
+extern int      getc       (FILE *stream);
+extern int      getchar    (void);
+extern char    *gets       (char *str);
+extern int      putc       (int ch, FILE *stream);
+extern int      putchar    (int ch);
+extern int      puts       (const char *str);
+extern int      ungetc     (int ch, FILE *stream);
+extern void     perror     (const char *str);
+extern int      snprintf   (char *str, size_t size, const char *format, ...);
+
+
 #ifdef __cplusplus
 }
 #endif