# NetworkUdp.Open

Open through the NetworkUdp runtime.

Last updated: 2026-09-09

Package: runtime.NetworkUdp | Status: registered-intrinsic

Tags: builtin, cpu, networkudp, yeho

Built into Yeho; no package import is needed. Native services require an admitted host and the correct resource lifecycle.

```yh
NetworkUdp.Open(text local_IPv4_address, int local_port) -> int
```


## Call NetworkUdp.Open

A complete typed caller with illustrative arguments. Native operations need the corresponding host and resources.

Verification: type checked

```yh
text local_IPv4_address = "local IPv4 address"
int local_port = 1
int result = NetworkUdp.Open(local_IPv4_address, local_port)
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.runtime__networkudp_open"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/runtime--NetworkUdp.Open/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


The example checks the call shape. Opening windows, recording audio, changing files, network operations, and process operations have real effects when run. Follow the corresponding package lifecycle before using live resources.

Source: yeho/src/compiler/common/intrinsic_registry.cpp

AI training permission: https://demonhunterlabs.com/ai-use