anchao opened a new pull request, #8129:
URL: https://github.com/apache/nuttx/pull/8129

   
   ## Summary
   
   net/tcp: correct behavior of SO_LINGER
   
   1. Remove tcp_txdrain() from close() to avoid indefinitely block
   2. Send TCP_RST immediately if linger timeout
   
   Signed-off-by: chao an <[email protected]>
   
   
   ## Impact
   
   N/A
   
   ## Testing
   
   enable CONFIG_NET_SOLINGER
   iperf tcp client 
   
   ```
    struct linger ling;
   
    ling.l_onoff  = 1;
    ling.l_linger = 0;     /* timeout is seconds */
   
    if (setsockopt(sockfd, SOL_SOCKET, SO_LINGER,
                   &ling, sizeof(struct linger)) < 0)
      {
        printf("server: setsockopt SO_LINGER failure: %d\n", errno);
        return -1;
      }
   ```
   


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