Function session

example/echo_server.cpp:4–12

using namespace co_context;

task<> session(int sockfd) {
    co_context::socket sock{sockfd};
    char buf[8192];

    while (true) {
        int nr = co_await sock.recv(buf);
        co_await sock.send({buf, (size_t)nr});
    }
}

task<> server(const uint16_t port) {
    acceptor ac{inet_address{port}};