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ftruncate

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