1 files changed, 22 insertions, 8 deletions
diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 8bdb42b..b9acb17 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -38,7 +38,7 @@ create (const char *filename, off_t initial_size)
 static bool
 remove (const char *filename)
 {
-  return false;
+  return filesys_remove (filename);
 }
 
 static int
@@ -66,12 +66,6 @@ open (const char *filename)
   return -1;
 }
 
-static int
-filesize (int fd_i)
-{
-  return 0;
-}
-
 static struct file **
 get_fd (struct thread *thread, int fd_i)
 {
@@ -158,15 +152,35 @@ write (int fd_i, const void *buf, unsigned size)
   }
 }
 
+static int
+filesize (int fd_i)
+{
+  struct thread *thread = thread_current ();
+  struct file **fd = get_fd (thread, fd_i);
+  if (fd && *fd) {
+    return file_length (*fd);
+  }
+  return -1;
+}
+
 static void
 seek (int fd_i, unsigned position)
 {
-  return;
+  struct thread *thread = thread_current ();
+  struct file **fd = get_fd (thread, fd_i);
+  if (fd && *fd) {
+    file_seek (*fd, position);
+  }
 }
 
 static unsigned
 tell (int fd_i)
 {
+  struct thread *thread = thread_current ();
+  struct file **fd = get_fd (thread, fd_i);
+  if (fd && *fd) {
+    return file_tell (*fd);
+  }
   return 0;
 }