Ftruncate

:::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. :::

namespace HH\Lib\OS;

function ftruncate(
  FileDescriptor $fd,
  int $length,
): void;

Parameters

• FileDescriptor $fd
• int $length

Returns

• void