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

FFmpeg trac at avcodec.org
Mon Mar 8 01:13:05 EET 2021

#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            |
 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,

 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.

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

More information about the FFmpeg-trac mailing list