Create libioutil, implement a filewriter

libsystem/system.h

@@ -6,15 +6,6 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#if defined(__x86_64__)
-#define PAGE_SIZE 4096
-#endif
-
-#define MAP_PRESENT (1 << 0)
-#define MAP_RW      (1 << 1)
-#define MAP_USER    (1 << 2)
-#define MAP_FLAGS   (MAP_PRESENT | MAP_USER)
-
 /* Quit the current running process */
 int quit (void);
 
@@ -85,7 +76,7 @@ int read_dir_entry (const char* path, struct dir_entry* entry, size_t entry_num)
 int create_file (const char* path);
 
 /* write to a file */
-int write_file (const char* path, size_t off, uint8_t* buffer, size_t size);
+int write_file (const char* path, size_t off, uint8_t* buffer, size_t size, uint32_t flags);
 
 /* wait for process */
 int wait_for_pid (int pid);