rontolisp:tcp-accept

(rontolisp:tcp-accept listener)

Blocks until a client connects to the given listener handle (from rontolisp:tcp-listen) and returns a bidirectional stream handle for the accepted connection — the same kind of handle rontolisp:tcp-connect returns, usable with read-line, write-line, read-byte, write-byte and close.

The example is self-contained: because the client connects before the accept, the connection waits in the listen backlog and the single-threaded program never blocks for long:

Backend support

• Interpreter and JVM: java.net.ServerSocket.accept(); accepting on a closed listener signals an error.
• WASM: component-only. The accept is a cooperatively blocking read of one tcp-socket handle from the wasi:sockets@0.3.0 accept stream. Returns nil if accepting fails. Compile error in Preview 1 (core-module) mode.
• Browser playground: not supported.

Limitations

• Blocks indefinitely until a client connects; there is no timeout parameter.
• One connection is served per call — accept again for the next client (see the server loop under rontolisp:tcp-listen).