"Marco Bizzarri" <[EMAIL PROTECTED]> writes:
> I would like to study the protocol for large object operations
> (lo_read, lo_write,...) between the front-end and back-end.

> I've found this
> http://www.postgresql.org/docs/8.1/static/protocol.html, but it looks
> like it has no message specific for large object...

libpq does it through Function Call messages that invoke lo_open and so
on.  Look into src/interfaces/libpq/fe-lobj.c.

                        regards, tom lane

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