XinStellaris opened a new pull request, #8052:
URL: https://github.com/apache/nuttx/pull/8052

   ## Summary
   add a new IOC command PIPEIOC_POLLTHRES to set POLLIN threshold.
   When local udp socket is used, this threshold will avoid non-blocking read 
failed with -EAGAIN when only preamble len is sent and read by reader. To do 
so, local udp socket should set threshold to be sizeof preamble len.
   
   Setting local udp socket threshold will be done in another patch.
   
   ## Impact
   None, only affects others after using the new command.
   
   ## Testing
   Tested with CONFIG_EXAMPLES_UDGRAM
   


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