1set_display_switch_callback(3)  Allegro manual  set_display_switch_callback(3)
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NAME

6       set_display_switch_callback  -  Installs a switching notification call‐
7       back. Allegro game programming library.
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SYNOPSIS

10       #include <allegro.h>
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13       int set_display_switch_callback(int dir, void (*cb)());
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DESCRIPTION

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

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

31       remove_display_switch_callback(3),          set_display_switch_mode(3),
32       exswitch(3)
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36Allegro                          version 4.2.2  set_display_switch_callback(3)
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