socklen_t sendbuflen = 0;
socklen_t len = sizeof(sendbuflen);
getsockopt(clientSocket, SOL_SOCKET, SO_SNDBUF, (void*)&sendbuflen, &len);
printf("default,sendbuf:%d\n", sendbuflen);
sendbuflen = 10240;
setsockopt(clientSocket, SOL_SOCKET, SO_SNDBUF, (void*)&sendbuflen, len);
getsockopt(clientSocket, SOL_SOCKET, SO_SNDBUF, (void*)&sendbuflen, &len);
printf("now,sendbuf:%d\n", sendbuflen);
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