Operations on large files.
This sub-module provides 64-bit variants of the channel functions
that manipulate file positions and file sizes. By representing
positions and sizes by 64-bit integers (type int64) instead of
regular integers (type int), these alternate functions allow
operating on files whose sizes are greater than max_int.
val seek_out : out_channel -> int64 -> unitval pos_out : out_channel -> int64val out_channel_length : out_channel -> int64val seek_in : in_channel -> int64 -> unitval pos_in : in_channel -> int64val in_channel_length : in_channel -> int64