centos man page for set_display_switch_callback

set_display_switch_callback(3alleg4)				  Allegro manual			      set_display_switch_callback(3alleg4)

NAME
       set_display_switch_callback - Installs a switching notification callback. 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 previously 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
       platform or you have reached the maximum number of allowed callbacks.

SEE ALSO
       remove_display_switch_callback(3alleg4), set_display_switch_mode(3alleg4), exswitch(3alleg4)

Allegro 							   version 4.4.2			      set_display_switch_callback(3alleg4)