1 files changed, 6 insertions, 0 deletions

diff --git a/fd.c b/fd.c
index e61cab2..7de4d55 100644
--- a/fd.c
+++ b/fd.c
@@ -149,3 +149,9 @@ fd_incref(struct fd *fd)
   fd->ref++;
   release(&fd_table_lock);
 }
+
+int
+fd_dup(struct fd *fd)
+{
+  return -1;
+}