WriteAllAsync

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Write all of the requested data

public function writeAllAsync(
  string $bytes,
  ?int $timeout_ns = NULL,
): Awaitable<void>;

A wrapper aroudn writeAsync() that will:

• do multiple writes if necessary to write the entire provided buffer
• fail with EPIPE if it is not possible to write all the requested data

It is possible for this to never return, e.g. if called on a pipe or or socket which the other end keeps open forever. Set a timeout if you do not want this to happen.

Parameters

• string $bytes
• ?int $timeout_ns = NULL

Returns

• Awaitable<void>