DPMSQueryExtension (3)

cc [ flag ... ] file ... -lXext [ library ... ]
#include <X11/extensions/dpms.h>
Bool DPMSQueryExtension
(

      Display *display\^,

      int *event_base\^,

      int *error_base\^
);

display

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

The 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.

TRUE

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.

DPMSGetVersion(3)