set_display_switch_callback man page on DragonFly

set_display_switch_callback man page on DragonFly

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set_display_switch_callback(3)	Allegro manual	set_display_switch_callback(3)

NAME
       set_display_switch_callback  -  Installs a switching notification call‐
       back. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       int set_display_switch_callback(int dir, void (*cb)());

DESCRIPTION
       Installs a notification callback for the switching mode that was previ‐
       ously  selected	by  calling  set_display_switch_mode().	 The direction
       parameter can either be SWITCH_IN or SWITCH_OUT, depending whether  you
       want  to	 be  notified about switches away from your program or back to
       your program. You can sometimes install callbacks for  both  directions
       at the same time, but not every platform supports this. You can install
       several switch callbacks, but no more than eight on any platform.

RETURN VALUE
       Returns zero on success, decreasing the number of empty callback	 slots
       by  one.	 Returns -1 if the request is impossible for the current plat‐
       form or you have reached the maximum number of allowed callbacks.

SEE ALSO
       remove_display_switch_callback(3),	   set_display_switch_mode(3),
       exswitch(3)

Allegro				 version 4.4.2	set_display_switch_callback(3)

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