Re: pgsql: Handle SIGTERM in pg_receivewal and pg_recvlogical

> On 14 Sep 2022, at 17:06, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> 
> Daniel Gustafsson <dgustafsson@postgresql.org> writes:
>> Since pg_recvlogical is also supposed to run as a daemon, teach it about
>> SIGTERM as well and update the documentation to match.  While in there,
>> change pg_receivewal's time_to_stop to be sig_atomic_t like it is in
>> pg_recvlogical.
> 
> While looking at this commit, I wondered why both of those programs
> are declaring their signal handlers like
> 
> static void
> sigint_handler(int signum)
> 
> rather than our standard convention
> 
> static void
> pmdie(SIGNAL_ARGS)

Sorry, I had missed that convention.

> Evidently we don't (any longer?) have any platforms where SIGNAL_ARGS
> is non-default, but that still doesn't make this good coding.  More
> than once I've grepped for SIGNAL_ARGS to locate signal handlers.
> 
> Hmm, looks like same mistake in pg_waldump ...

pg_test_fsync seems to have the same error.

> barring objection,
> I'm going to run around and fix those.

No objections, unless you have better things to do and wan't me to clean up
then I'll take care of it.

> I also notice that port.h has
> 
> typedef void (*pqsigfunc) (int signo);
> extern pqsigfunc pqsignal(int signo, pqsigfunc func);
> 
> which is a bit inconsistent with the idea that SIGNAL_ARGS
> might be different from that.  Shouldn't we declare it as
> 
> typedef void (*pqsigfunc) (SIGNAL_ARGS);

Agreed, that makes sense.

--
Daniel Gustafsson        https://vmware.com/