TCP/IP 編程

1. 探測鏈接是否存活選項:  SO_KEEPALIVE， 默認關閉linux     打開：緩存 int optval = 1;setsockopt(clifd, SOL_SOCKET, SO_KEEPALIVE, (char *)&optval, sizeof(optval))；socket 默認2小時發送一次探測包code 2. 探測接收緩存中可讀的字節數:  io unsigned int

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