cc [ flag ... ] file ... -lXext [ library ... ]
#include <X11/extensions/dpms.h>
Bool DPMSQueryExtension( Display *display, int *event_base,
int *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(3)