Re: pgsql: psql: Add test for query canceling

> That looks pretty solid to me, and I can confirm that it passes
> on wrasse's host.  The only nit I can find to pick is that this:
>
> +    usleep(10_000) until -s "$tempdir/psql.pid" or ($count++ > 180 * 100 and die 'pid file did not appear');
>
> basically assumes that psql.pid will be written atomically.

> It'd be marginally safer to wait till psql.pid can be seen to
> contain a newline.  I don't think that would be too hard to do,
> if you put the slurp_file call inside the wait loop and inspect
> its result.

I finally came around to have a look at the patch.

For the issue raised above, I can see that the file could be created but 
not yet written, but as the patch waits for the file to be non zero, ISTM 
that the probability of a torn write of a single integer by echo is so 
remote that we could let it as that?

Attached a version with the slurping in the loop anyway.

-- 
Fabien.