/usr/lib/xemacs-21.4.24/x86_64-linux-gnu/include/events-mod.h is in xemacs21-bin 21.4.24-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | /* The modifiers XEmacs knows about; these appear in key and button events. */
#define XEMACS_MOD_CONTROL (1<<0)
#define XEMACS_MOD_META (1<<1)
#define XEMACS_MOD_SUPER (1<<2)
#define XEMACS_MOD_HYPER (1<<3)
#define XEMACS_MOD_ALT (1<<4)
#define XEMACS_MOD_SHIFT (1<<5) /* not used for dual-case characters */
#define XEMACS_MOD_BUTTON1 (1<<6)
#define XEMACS_MOD_BUTTON2 (1<<7)
#define XEMACS_MOD_BUTTON3 (1<<8)
#define XEMACS_MOD_BUTTON4 (1<<9)
#define XEMACS_MOD_BUTTON5 (1<<10)
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