Use the gcc cleanup extension attribute to handle closing temp files

While some of these allocations will go away as we convert to C++,
some of these need to stay C as the are going to be moved into a
library to support loading cache from init daemons etc.

For the bits that will eventually be C++ this helps clean things up,
in the interim.

TODO: apply to libapparmor as well

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Tyler Hicks <tyhicks@canonical.com>

parser/lib.c

@@ -40,6 +40,23 @@ void __autofree(void *p)
 	free(*_p);
 }
 
+void __autoclose(int *fd)
+{
+	if (*fd != -1) {
+		/* if close was interrupted retry */
+		while(close(*fd) == -1 && errno == EINTR);
+		*fd = -1;
+	}
+}
+
+void __autofclose(FILE **f)
+{
+	if (*f) {
+		fclose(*f);
+		*f = NULL;
+	}
+}
+
 /**
  * dirat_for_each: iterate over a directory calling cb for each entry
  * @dir: already opened directory (MAY BE NULL)