Grant

src/lib/user/syscall.c

@@ -103,7 +103,6 @@ remove (const char *file)
 int
 open (const char *file)
 {
-  printf("attemping OPEN\n");
   return syscall1 (SYS_OPEN, file);
 }
 

src/userprog/process.c

@@ -139,6 +139,16 @@ release_child (struct wait_status *cs)
 int
 process_wait (tid_t child_tid) 
 {
+  while(1){}
+  struct list_elem * e;
+  struct thread * t = NULL;
+  struct thread * cur = thread_current();
+  for (e = list_begin (&cur->children); e != list_end (&cur->children);e = list_next (e)){
+      struct thread * t2 = list_entry (e, struct thread, allelem);
+      if (t2->tid == child_tid){t = t2; break;}
+  }
+  if (t == NULL){return -1;}
+  sema_down(&(t->wait_status->dead));
   return -1;
 }
 

src/userprog/syscall.c

@@ -200,8 +200,8 @@ sys_exec (const char *ufile)
 static int
 sys_wait (tid_t child) 
 {
-/* Add code */
-  thread_exit ();
+  process_wait(child);
+  //thread_exit ();
 }
 
 /* Create system call. */