1 files changed, 12 insertions, 0 deletions
diff --git a/libio/stdio/fileno.c b/libio/stdio/fileno.c
new file mode 100644
index 00000000000..c0bc55ce9a1
--- /dev/null
+++ b/libio/stdio/fileno.c
@@ -0,0 +1,12 @@
+#include "libioP.h"
+#include "stdio.h"
+
+int
+fileno(fp)
+     _IO_FILE* fp;
+{
+  CHECK_FILE(fp, EOF);
+  if (!(fp->_flags & _IO_IS_FILEBUF))
+    return EOF;
+  return _IO_fileno(fp);
+}