diff --git a/userprog/syscall.c b/userprog/syscall.c
index 55e9ffe91f27173f2ef6daa1d311dcd6e1bb3148..4d82e20bdda44ef7d9aaba8da4204e3d3b4bc392 100644
--- a/userprog/syscall.c
+++ b/userprog/syscall.c
@@ -78,3 +78,9 @@ syscall_handler (struct intr_frame *f UNUSED)
 	thread_exit();
   }  
 }
+
+
+void file_search(struct file_map *f) {
+	// TODO: Write file search
+	f->file = NULL;
+}
\ No newline at end of file
diff --git a/userprog/syscall.h b/userprog/syscall.h
index 90590967a9f96f9ea359d15c672b815dfb4379cb..4adc2988a944f4e68b80475e5f6449503ca06849 100644
--- a/userprog/syscall.h
+++ b/userprog/syscall.h
@@ -3,4 +3,6 @@
 
 void syscall_init (void);
 
+void file_search(struct file_map *f);
+
 #endif /* userprog/syscall.h */
diff --git a/userprog/syscall_filesize.c b/userprog/syscall_filesize.c
index ebfbf76167d58126c5c6cee9bb7da6c6764922c6..8bdba551c98197a851636f5d306ce45d5d8b3467 100644
--- a/userprog/syscall_filesize.c
+++ b/userprog/syscall_filesize.c
@@ -8,13 +8,14 @@
 #include "filesys/file.h"
 
 int syscall_filesize(struct intr_frame *f) {
+	struct file_map *f_map; // Described in system_calls.h
 	// pop off first int argument from interrupt frame
-	int file_descriptor = *((int*)f->esp + 1);
-    // Described in system_calls.h, stores file descriptors mapped to files
-	struct file_map *file_map = get_file(file_descriptor); 
-	if (file_map == NULL) // Checking if file is empty or non-existent
+	f_map->file_descriptor = *((int*)f->esp + 1);
+	file_search();
+	if (f_map->file == NULL) { // Checking if file is empty or non-existent
 		return -1; // Returning failure state
+	}
 	// Using the file_length function in file.h to get the length and store it
-	int size = file_length(file_map->file); 
+	int size = file_length(f_map->file); 
 	f->eax = size;
 }
\ No newline at end of file
diff --git a/userprog/system_calls.h b/userprog/system_calls.h
index 21d6f9f95f9ba4a77c47687ad5f95a1c9de9c25e..c063331cf819351a84a6d061aad305a5a9c8d4bd 100644
--- a/userprog/system_calls.h
+++ b/userprog/system_calls.h
@@ -36,7 +36,7 @@ void syscall_wait(struct intr_frame *f);
 /*
 * Returns the size, in bytes, of the file open as fd.
 */
-int syscall_filesize(struct intr_frame *f)
+void syscall_filesize(struct intr_frame *f)
 
 /*
  * NOTE: There are more system calls implemented by Pintos but we are not