[GitHub] [incubator-nuttx] anchao opened a new pull request, #6972: net/usrsock: read from the closed remote should return EOF

[GitBox]

anchao opened a new pull request, #6972:
URL: https://github.com/apache/incubator-nuttx/pull/6972

   
   ## Summary
   
   net/usrsock: read from the closed remote should return EOF
       
   fix usrsock remote_disconnect fail:
       
   ```
       nsh> usrsocktest
       ...
       Testing group "remote_disconnect" =>
               [TEST ASSERT FAILED!]
                       In function "receive":
                       line 497: Assertion `(ssize_t)((ret)) == (ssize_t)((0))' 
failed.
                               got value: -1
                               should be: 0
               Group "remote_disconnect": [FAILED]
       ...
   ```
       
       Reference:
       
   ```
       RECV(2)
       
       NAME
              recv, recvfrom, recvmsg - receive a message from a socket
       ...
       RETURN VALUE
       ...
              When a stream socket peer has performed an orderly shutdown,
              the return value will be 0 (the traditional "end-of-file" return).
       
              Datagram sockets in various domains (e.g., the UNIX and Internet 
domains)
              permit zero-length datagrams.  When such a datagram is received, 
the return value is 0.
   ```
       
       Signed-off-by: chao an <anc...@xiaomi.com>
   
   
   ## Impact
   
   ## Testing
   
   Pass the usrsock test:
   
https://github.com/apache/incubator-nuttx-apps/blob/master/examples/usrsocktest/usrsocktest_remote_disconnect.c#L492-L497


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