libio: Eliminate _IO_stdin, _IO_stdout, _IO_stderr

These variables are only used to determine if a stdio stream is
a pre-allocated stream, but it is possible to do so by comparing
a FILE * to all pre-allocated stream objects.  As a result, it is
not necessary to keep those pointers in separate variables.

Behavior with symbol interposition is unchanged because _IO_stdin_,
_IO_stdout_, _IO_stderr_ are exported, and refer to objects outside of
libc if symbol interposition or copy relocations are involved.  (The
removed variables _IO_stdin, _IO_stdout, _IO_stderr were not exported,
of course.)

1 files changed, 1 insertions, 6 deletions

diff --git a/libio/oldiofclose.c b/libio/oldiofclose.c
index e4cbf88566..be5044c3bd 100644
--- a/libio/oldiofclose.c
+++ b/libio/oldiofclose.c
@@ -58,12 +58,7 @@ _IO_old_fclose (FILE *fp)
   _IO_FINISH (fp);
   if (_IO_have_backup (fp))
     _IO_free_backup_area (fp);
-  if (fp != _IO_stdin && fp != _IO_stdout && fp != _IO_stderr)
-    {
-      fp->_flags = 0;
-      free(fp);
-    }
-
+  _IO_deallocate_file (fp);
   return status;
 }