cc [ flag ... ] file ... -lXext [ library ... ]
#include <X11/extensions/dpms.h>
Bool DPMSQueryExtension( Display *display, CARD32 *event_base,
CARD32 *error_base );Argumentsdisplay Specifies the connection to
the X server event_base Specifies the return location for the assigned
base event error_base Specifies the return location for the assigned base
error DescriptionThe DPMSQueryExtension function queries the X server
to determine the availability of the Display Power Management Signaling
(DPMS) Extension. If the extension is available, it returns TRUE, and
the event_base and error_base are set to the base event and error numbers,
respectively. Otherwise, the return value is FALSE, and the values of
event_base and error_base are undefined.
Return ValuesTRUE The DPMSQueryExtension
function returns TRUE if the extension is available, and event_base and
error_base are set to the base event number and base error number for
the extension, respectively. FALSE The DPMSQueryExtension function returns
FALSE if extension is not available, and the values of event_base and
error_base are undefined. See AlsoDPMSGetVersion(3x)