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+.TH XvGrabPort 3X __vendorversion__
+.\" $XFree86: xc/doc/man/Xv/XvGrabPort.man,v 1.5 2001/01/27 18:20:36 dawes Exp $
+.SH Name
+XvGrabPort \- lock port for exclusive use by client
+.\"
+.SH Syntax
+.B #include <X11/extensions/Xvlib.h>
+.sp 1l
+.B XvGrabPort(\fIdpy, port, time)\fR
+.sp 1l
+.B Display \fI*dpy;\fR
+.br
+.B XvPortID 
+.I port;
+.br
+.B Time 
+.I time;
+.\"
+.SH Arguments
+.\"
+.IP \fIdpy\fR 8 
+Specifies the display screen on which the
+Xv Server is to accept requests from Xv clients.  If the
+display option is not specified, Xv uses the display screen
+specified by your DISPLAY environment variable.  The display
+option has the format hostname:number.  Using two colons
+(::) instead of one (:) indicates that DECnet is to be used
+for transport.
+.IP \fIport\fR 8
+Defines the port to be grabbed.
+.IP \fItime\fR 8
+Specifies the request timestamp.
+.\"
+.SH Description
+.\"
+XvGrabPort(3X) grabs a port.  Once a client grabs a port, 
+only that client can make video requests
+to that port.  
+.PP
+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 \fISuccess\fR.  The port time is updated when the following
+requests are processed: XvGrabPort(3X), XvUngrabPort(3X),
+XvPutVideo(3X), XvPutStill(3X), XvGetVideo(3X), XvGetStill(3X).
+.PP
+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.
+.\"
+.SH Returned Values
+.IP [Success] 8
+Returned if XvGrabPort(3X) completed successfully.
+.IP [XvInvalidTime] 8
+Returned if requested time is older than the current port time.
+.IP [XvAlreadyGrabbed] 8
+Returned if the port is already grabbed by another client.
+.IP [XvBadExtension] 8
+Returned if the Xv extension is unavailable.
+.IP [XvBadAlloc] 8
+Returned if XvGrabPort(3X) failed to allocate memory to process
+the request.
+.SH Diagnostics
+.IP [XvBadPort] 15
+Generated if the requested port does not exist.
+.\"
+.SH See Also
+.\"
+XvUngrabPort(3X) XvVideoNotify(3X)
+.br