It won't work properly that way. SIGINT gets sent to all the members
of the process group, not just the child. Psql isn't responsible for
sending ctrl-c through to the child.
Except that if I am in less, and I do CONTROL-C, it doesn't do anything at
all.
It doesn't exit.
If I send a kill -2 to the process, it doesn't exit. less ignores SIGINT
completely.
So, whether or not they are working together in cooperation, the result we
have been seeing when typing CONTROL-C is completely under the control of
psql.
I do realize that the problem is one of when and how to cancel the query if
CONTROL-C is pressed.
If the query is still building and the output hasn't, or won't be, sent to
the pager, cancel the query.
If we are in the pager, don't respond to CONTROL-C, and instead output a
helpful hint telling people to use q to quit, which will do what they really
wanted anyway.
In theory, we already deal gracefully with q being pressed in the pager.
Sean
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TIP 6: explain analyze is your friend
