[FFmpeg-trac] #9142(undetermined:new): LIBSRT uses wrong write-readiness epoll on a listener socket

[FFmpeg]

#9142: LIBSRT uses wrong write-readiness epoll on a listener socket
-------------------------------------+-------------------------------------
             Reporter:  ethouris     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 The epoll subscription for a listener socket uses the same method as for
 other modes, by waiting for write readiness. This works only due to a bug
 in LIBSRT, which will be fixed at some point. The event that should be
 checked ready on a listener socket should be the read-readiness,
 SRT_EPOLL_IN.

 This is where the epoll is being created:

 ```
 ret = write_eid = libsrt_epoll_create(h, fd, 1);
 ```

 Then it is used in both branches for a listener socket and connected
 socket. For connecting (and rendezvous) socket it's ok, write-readiness
 defines connection-ready. For a listener socket it should use read-
 readiness, so creation of eid for the listener branch should be likely
 done separately, with "0" last parameter.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9142>
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