pg_lo_lseek
moves the current read/write
position to offset bytes from the position
specified by whence.
The handle of a connection to the database in which the large object exists.
A descriptor for the large object from pg_lo_open.
The new seek position in bytes.
Specified from where to calculate the new seek position: SEEK_CUR (from current position), SEEK_END (from end), or SEEK_SET (from start).
The current zero-based byte offset in the large object, after the seek is complete. This is identical to the value which would be returned by pg_lo_tell.
A Tcl error will be thrown if an error occurs.