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/iofclose.c b/libio/iofclose.c
index 9b39a6cc4e..8a80dd0b78 100644
--- a/libio/iofclose.c
+++ b/libio/iofclose.c
@@ -71,12 +71,7 @@ _IO_new_fclose (FILE *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;
 }