Re: [HACKERS] Which signal to use for CANCEL from postmaster to backend?

> Hmm.  I find that SIGUSR1 and SIGUSR2 are both already in use for
> communication between backends.  We can't really commandeer SIGURG,
> either, because it's apparently the same as SIGUSR1 on SCO
> (see src/include/port/sco.h ... so OOB wouldn't work there anyway!).
>
> All three of SIGINT, SIGHUP, SIGTERM currently do the same thing in a
> backend, so it looks like our best choice is to redefine one of those
> as the cancel request signal.  Any preference?
>
>             regards, tom lane
>
>

I like SIGQUIT.  Looks to be unused.  SIGINT is used too much from the
command line, and SIGTERM used too much from scripts (the default kill
arg.)


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