How to build a simple LED RESTful service in Raspberry PI?

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set_leds

set_leds(3alleg4)                                                 Allegro manual                                                 set_leds(3alleg4)

NAME

       set_leds - Sets the state of the keyboard LED indicators. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       void set_leds(int leds);

DESCRIPTION

       Overrides  the  state  of  the  keyboard  LED indicators. The parameter is a bitmask containing any of the values KB_SCROLOCK_FLAG, KB_NUM-
       LOCK_FLAG, and KB_CAPSLOCK_FLAG, or -1 to restore the default behavior. Example:

          /* Cycle led indicators. */
          set_leds(KB_SCROLOCK_FLAG);
          rest(1000);
          set_leds(KB_CAPSLOCK_FLAG);
          rest(1000);
          set_leds(KB_NUMLOCK_FLAG);
          rest(1000);
          set_leds(-1);

       Note that the led behaviour cannot be guaranteed on some platforms, some leds might not react, or none at all. Therefore you shouldn't rely
       only on them to communicate information to the user, just in case it doesn't get through.

SEE ALSO

       install_keyboard(3alleg4), key_led_flag(3alleg4)

Allegro                                                            version 4.4.2                                                 set_leds(3alleg4)

Programming