05-10-2019
No.
Clients do not "listen" on port 80 or 443, servers listen on them.
In general, client processes are not "listeners".
I would love to take all my time teaching you client server operations; but it is really better for you to learn about this yourself.
You cannot learn about this in 10 minutes. You need to read some books or watch 3 or 4 YT videos, or both.
I spend my time developing code. However, there may be others here at unix.com who have time to teach you client-server communications.
Sorry, I just do not have the time right now. However, I can answer one question a day if you want to ask me (maybe two at the most); but you could probably learn faster watching some YT videos.
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LEARN ABOUT X11R4
xvgrabport
XvGrabPort(3) Library Functions Manual XvGrabPort(3)
Name
XvGrabPort - lock port for exclusive use by client
Syntax
#include <X11/extensions/Xvlib.h>
XvGrabPort(Display *dpy, XvPortID port, Time time);
Arguments
dpy Specifies the connection to the X server.
port Defines the port to be grabbed.
time Specifies the request timestamp.
Description
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 fol-
lowing 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.
Returned Values
[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.
Diagnostics
[XvBadPort] Generated if the requested port does not exist.
See Also
XvUngrabPort(3) XvVideoNotify(3)
X Version 11 libXv 1.0.4 XvGrabPort(3)