Re: [GENERAL] libpq error codes

> EOF, no more and no less.  It is not for the kernel to decide whether
> the connection closure represents an application-level error or not.
> Sounds like someone has managed to blow this badly in recent Linux TCP
> stacks.  Care to file a kernel bug report?

Yeps.

> In the meantime, it's probably reasonable for libpq to treat EPIPE from
> read() the same as EOF --- if I recall correctly, it already tests for
> ECONNRESET instead of EOF from kernels that have that variety of
> braindamage, so adding a defense against this variety is fair game.
> If you look in src/interfaces/libpq/fe-misc.c the places to fix should
> be obvious (but note there are two or three of them, not just one).
> Please try it out and submit a patch after you've verified it fixes
> your problem.

Now I get:

db=> select count(*) from pg_class;
 count
-------
 28531
(1 row)

db=> select count(*) from pg_class;
pqReadData() -- backend closed the channel unexpectedly.
        This probably means the backend terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
!>

Looks much more reasonable. But I do not get messages about shutdown.
With a patch enclosed it will perform like with ECONNRESET.
Shouldn't I emulate EOF when EPIPE?

--
Sincerely Yours,
Denis Perchine

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