ReadHandle

:::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. :::

An IO\Handle that is readable

If implementing this interface, you may wish to use ReadHandleConvenienceAccessorTrait, which implements readAllAsync() and readFixedSizeAsync() on top of readAsync.

Interface Synopsis

namespace HH\Lib\IO;

interface ReadHandle implements Handle {...}

Public Methods

• ->readAllAsync(?int $max_bytes = NULL, ?int $timeout_ns = NULL): Awaitable<string>
  Read until there is no more data to read
• ->readAllowPartialSuccessAsync(?int $max_bytes = NULL, ?int $timeout_ns = NULL): Awaitable<string>
  Read from the handle, waiting for data if necessary
• ->readFixedSizeAsync(int $size, ?int $timeout_ns = NULL): Awaitable<string>
  Read a fixed amount of data
• ->readImpl(?int $max_bytes = NULL): string
  An immediate, unordered read