Noah Misch <n...@leadboat.com> writes: > On Tue, Aug 14, 2012 at 08:40:06AM -0400, Robert Haas wrote: >> On Tue, Aug 14, 2012 at 6:50 AM, Greg Stark <st...@mit.edu> wrote: >>> It is possible to check if the signal was synchronous or was sent from >>> an external process. You can check siginfo->si_pid to see who sent you >>> the signal. I'm not sure checking that and handling it at >>> check_for_interrupts if it's asynchronous is the best solution or not >>> though.
>> If that's portable it might be an option, but I doubt that it is. > I suspect it is portable. Single Unix Spec V2 says (on the sigaction man page) The si_code member contains a code identifying the cause of the signal. If the value of si_code is less than or equal to 0, then the signal was generated by a process and si_pid and si_uid respectively indicate the process ID and the real user ID of the sender. I'm not sure I would trust checking si_pid alone; it would definitely fail on my old HPUX box, where I see that field is union'ed with si_addr and so will read as garbage for a locally-sourced SIGFPE. But it might be that checking si_code alone would work reliably. I think that rejecting an externally sourced SIGFPE might be worth doing if we can distinguish that reliably. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers