implement exit

1 files changed, 18 insertions, 0 deletions

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 2116e5c..cce7574 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -83,6 +83,23 @@ get_file (struct thread *thread, int fd_i)
   return fd->file;
 }
 
+static void
+exit (int status)
+{
+  struct thread *thread = thread_current ();
+
+  if (thread->fds) {
+    for (int i = 0; i < MAX_FDS; i++) {
+      struct fd *fd = thread->fds + i;
+      if (fd && fd->active) {
+        file_close (fd->file);
+        fd->active = false;
+      }
+    }
+    free(thread->fds);
+  }
+}
+
 static int
 read (int fd_i, void *buf, unsigned size)
 {
@@ -168,6 +185,7 @@ syscall_handler (struct intr_frame *f UNUSED)
       break;
     case 1:
       // exit
+      exit (INTR_ESP (1, int));
       break;
     case 4:
       // create