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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).