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set_leds(3alleg4) [osx man page]

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)

Check Out this Related Man Page

install_keyboard(3alleg4)                                         Allegro manual                                         install_keyboard(3alleg4)

NAME
install_keyboard - Installs the Allegro keyboard interrupt handler. SYNOPSIS
#include <allegro.h> int install_keyboard(); DESCRIPTION
Installs the Allegro keyboard interrupt handler. You must call this before using any of the keyboard input routines. Once you have set up the Allegro handler, you can no longer use operating system calls or C library functions to access the keyboard. Note that on some platforms the keyboard won't work unless you have set a graphics mode, even if this function returns a success value before calling set_gfx_mode. This can happen in environments with graphic windowed modes, since Allegro usually reads the keyboard through the graphical window (which appears after the set_gfx_mode call). Example: allegro_init(); install_timer(); install_keyboard(); /* We are not 100% sure we can read the keyboard yet! */ if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0) != 0) abort_on_error("Couldn't set graphic mode!"); /* Now we are guaranteed to be able to read the keyboard. */ readkey(); RETURN VALUE
Returns zero on success, or a negative number on failure (but you may decide not to check the return value as this function is very unlikely to fail). SEE ALSO
remove_keyboard(3alleg4), poll_keyboard(3alleg4), key(3alleg4), keypressed(3alleg4), readkey(3alleg4), ureadkey(3alleg4), keyboard_call- back(3alleg4), keyboard_ucallback(3alleg4), keyboard_lowlevel_callback(3alleg4), three_finger_flag(3alleg4), key_led_flag(3alleg4), set_leds(3alleg4), set_keyboard_rate(3alleg4), set_gfx_mode(3alleg4) Allegro version 4.4.2 install_keyboard(3alleg4)
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