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    <blockquote> <p>After some read/writes my sctp_sendmsg return EAGAIN, which means sctp send buffer is full. How should I handle this situation without losing the data I have already read from the fd_server socket?</p> </blockquote> <p>You need to keep some sort of "context" (data structure) for each fd_client socket. For each new client socket that gets connected to your server, create an instance of a "connection state" struct and store it in a hash table. This will be something like the following:</p> <pre><code>struct ConnectionState { int fd_client; // socket uint8_t buffer[MAX_CHUNK_SIZE]; // protocol buffer for this connection int buffer_length; // how many bytes received into this buffer int pos; // how many bytes transmitted back out on fd_client from "buffer" int has_data; // boolean to indicate protocol state (1 if there's still data in buffer to send) }; </code></pre> <p>If you can't send everything at once, toggle the fd_client socket from EPOLLIN to EPOLLOUT in your epoll mode. Change "has_data" to true in the ConnectionState structure. Then go back to waiting for socket events. When you are able to send again, you look at your ConnectionState struct for that socket to decide if you still need to keep sending or receive a new buffer.</p> <p>Be careful with edge triggered sockets. When you do transition from EPOLLOUT back to EPOLLIN, you need to go ahead and recv() again just to make sure you don't lose any data. (Similarly for entering the send state, try an initial send).</p>
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    1. POC: Data forwarding server using epoll ET fills the send buffer
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