check_window_system  785 src/androidmenu.c   check_window_system (f);
check_window_system 1274 src/fontset.c    check_window_system (NULL);
check_window_system 1909 src/fontset.c    check_window_system (NULL);
check_window_system  127 src/frame.c      check_window_system (f);
check_window_system 5409 src/frame.c      check_window_system (NULL);
check_window_system 1513 src/frame.h    extern WINDOW_SYSTEM_RETURN void check_window_system (struct frame *);
check_window_system 1676 src/haikufns.c   check_window_system (f);
check_window_system  313 src/haikumenu.c   check_window_system (f);
check_window_system 4138 src/haikuterm.c   check_window_system (f);
check_window_system 1994 src/pgtkfns.c    check_window_system (NULL);
check_window_system 2281 src/pgtkfns.c    check_window_system (NULL);
check_window_system 3723 src/pgtkfns.c    check_window_system (f);
check_window_system 1059 src/pgtkmenu.c   check_window_system (f);
check_window_system  460 src/pgtkterm.c   check_window_system (f);
check_window_system  563 src/pgtkterm.c   check_window_system (f);
check_window_system  108 src/w32menu.c    check_window_system (f);
check_window_system 1669 src/xfaces.c     check_window_system (NULL);
check_window_system 9413 src/xfns.c       check_window_system (f);
check_window_system 9634 src/xfns.c       check_window_system (f);
check_window_system 2446 src/xmenu.c      check_window_system (f);
check_window_system 2806 src/xselect.c    check_window_system (decode_live_frame (frame));