TCP Server
A minimal TCP echo server using built-in primitives. tcp_listen binds to a port, tcp_accept waits for a client connection, then you read and write data on the client socket. This is the foundation for all Nyx network servers.
Code
// TCP echo server — listen, accept, echo back
fn main() -> int {
let server: int = tcp_listen("0.0.0.0", 9000)
if server < 0 {
print("failed to listen on port 9000")
return 1
}
print("echo server listening on :9000")
let client: int = tcp_accept(server)
if client < 0 {
print("accept failed")
return 1
}
print("client connected")
let msg: String = tcp_read_line(client)
print("received: " + msg)
tcp_write(client, "echo: " + msg + "\n")
tcp_close(client)
tcp_close(server)
print("done")
return 0
}Output
echo server listening on :9000 client connected received: hello done
Explanation
tcp_listen("0.0.0.0", port) creates a listening socket on all interfaces. tcp_accept blocks until a client connects and returns a new file descriptor for that connection. The server reads one line, echoes it back prefixed with "echo: ", and closes both sockets.
For a production server, you would wrap the accept in a while loop and spawn a thread per client, or use http_serve_mt which handles the thread pool automatically.