Re: Fix handling of invalid sockets returned by PQsocket()

On 2/17/16 10:52 PM, Michael Paquier wrote:
> On Thu, Feb 18, 2016 at 1:58 AM, Alvaro Herrera
> <alvherre@2ndquadrant.com> wrote:
>> Michael Paquier wrote:
>>> Hi all,
>>>
>>> After looking at Alvaro's message mentioning the handling of
>>> PQsocket() for invalid sockets, I just had a look by curiosity at
>>> other calls of this routine, and found a couple of issues:
>>> 1) In vacuumdb.c, init_slot() does not check for the return value of PQsocket():
>>> slot->sock = PQsocket(conn);
>>> 2) In isolationtester.c, try_complete_step() should do the same.
>>> 3) In pg_recvlogical.c for StreamLogicalLog() I am spotting the same problem.
>>> I guess those ones should be fixed as well, no?
>>
>> I patched pgbench to use PQerrorMessage rather than strerror(errno).  I
>> think your patch should do the same.
> 
> OK, this looks like a good idea. I would suggest doing the same in
> receivelog.c then.

Let's make the error messages consistent as "invalid socket".  "bad
socket" isn't really our style, and pg_basebackup saying "socket not
open" is just plain incorrect.