man DMXGetInputCount (Fonctions bibliothèques) - determine number of input devices
NAME
DMXGetInputCount - determine number of input devices
SYNOPSIS
#include <X11/extensions/dmxext.h>
Bool DMXGetInputCount(Display *dpy,
int *input_count);
DESCRIPTION
DMXGetInputCount() returns the number of input devices connected to the Xdmx(1) server in input_count. This number is the same as that returned by XListInputDevices(3), but is available even when the XInput extension is not supported.
RETURN VALUE
DMXGetInputCount() returns True unless there is a protocol error.
SEE ALSO
DMXGetInputAttributes(3), XListInputDevices(3), DMX(3), Xdmx(1)