XvGrabPort - lock port for exclusive use by client

dpy     Specifies the connection to the X server.

       port    Defines the port to be grabbed.

       time    Specifies the request timestamp.

XvGrabPort(3) grabs a port.  Once a client grabs a port, only that client can make video requests to that
       port.

       If  the  time  is  before  the  current port time, the XvGrabPort request is ignored and XvInvalidTime is
       returned.  If the port is already grabbed by another client, XvAlreadyGrabbed is returned.  Otherwise  it
       returns  a  status  of  Success.   The  port  time  is updated when the following requests are processed:
       XvGrabPort(3), XvUngrabPort(3), XvPutVideo(3), XvPutStill(3), XvGetVideo(3), XvGetStill(3).

       If the port is actively processing video for another client, the video is preempted, and an XvVideoNotify
       event with detail XvPreempted is generated for its drawable.

       [XvBadPort]    Generated if the requested port does not exist.

       XvGrabPort - lock port for exclusive use by client

       [Success]
               Returned if XvGrabPort(3) completed successfully.

       [XvInvalidTime]
               Returned if requested time is older than the current port time.

       [XvAlreadyGrabbed]
               Returned if the port is already grabbed by another client.

       [XvBadExtension]
               Returned if the Xv extension is unavailable.

       [XvBadAlloc]
               Returned if XvGrabPort(3) failed to allocate memory to process the request.

XvUngrabPort(3), XvVideoNotify(3)

X Version 11                                      libXv 1.0.11                                     XvGrabPort(3)

#include<X11/extensions/Xvlib.h>intXvGrabPort(Display*dpy,XvPortIDport,Timetime);