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preallocateSpace(for:at:length:flags:replyHandler:)

Prealocates disk space for the given item.

Declaration

func preallocateSpace(for item: FSItem, at offset: off_t, length: Int, flags: FSVolume.PreallocateFlags, replyHandler reply: @escaping  @Sendable (Int, (any Error)?) -> Void)
func preallocateSpace(for item: FSItem, at offset: off_t, length: Int, flags: FSVolume.PreallocateFlags) async throws -> Int

Parameters

  • item:

    The item for which to preallocate space.

  • offset:

    The offset from which to allocate.

  • length:

    The length of the space in bytes.

  • flags:

    Flags that affect the preallocation behavior.

  • reply:

    A block or closure to indicate success or failure. If preallocation succeeds, pass the amount of bytes allocated and a nil error. If preallocation fails, pass the relevant error as the second parameter; FSKit ignores any byte count in this case. For an async Swift implementation, there’s no reply handler; simply return the allocated byte count or throw an error.

See Also

Preallocating space