ludic/docs/language/udp/udp-send.md
Orkuncakilkaya ebb1a00352 feat(udp): Udp.* - polled IPv4 datagrams on macOS and Windows
Udp.open/port/send/recv/from_ip/from_port/close/resolve/local_ip/ip/ip_text, native
BSD sockets (udp.ll) and Winsock (udp_win.ll, -lws2_32), linked only when a program
uses Udp.*; example, docs and tests.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-17 11:16:14 +03:00

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Markdown

---
id: udp-send
name: Udp.send
category: udp
kind: namespace-method
tokens: Udp.send
sig: Udp.send(socket, ip, port, bytes, len) -> int
tip: Send one datagram.
order: 2
ns: Udp
member: send
---
Sends the first <code>len</code> bytes of <code>bytes</code> to <code>ip</code>:<code>port</code> as one datagram and returns the number of bytes sent, or <code>-1</code>.
```ludic
program Demo {
entry {
let s = Udp.open(port: 0)
let buf = Memory.bytes(4)
Memory.poke(buf, 0, 1)
print(Udp.send(socket: s, ip: Udp.ip(text: "127.0.0.1"), port: Udp.port(socket: s), bytes: buf, len: 1))
}
}
```