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CentOS 7.0 - man page for dpmsqueryextension (centos section 3)

DPMSQueryExtension(3)						    X FUNCTIONS 					     DPMSQueryExtension(3)

NAME
DPMSQueryExtension - queries the X server to determine the availability of the DPMS Extension
SYNOPSIS
cc [ flag ... ] file ... -lXext [ library ... ] #include <X11/extensions/dpms.h> Bool DPMSQueryExtension ( Display *display, int *event_base, int *error_base );
ARGUMENTS
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
DESCRIPTION
The DPMSQueryExtension function queries the X server to determine the availability of the Display Power Management Signaling (DPMS) Exten- sion. 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 VALUES
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.
SEE ALSO
DPMSGetVersion(3) X Version 11 libXext 1.3.2 DPMSQueryExtension(3)