Debugging a program that uses SIGINT with gdb

Question

I frequently work with PostgreSQL for debugging, and it uses SIGINT internally for some of its inter-backend signalling.

As a result when running certain ba

Answer 1

On UNIX-like systems, you can distinguish a tty-initiated SIGINT from one sent by kill by looking at the si_pid element in the siginfo struct. If the pid is 0, it came from a tty.

So you could do something like this:

catch signal SIGINT
commands
  if $_siginfo._sifields._kill.si_pid == 0
    print "Received SIGINT from tty"
  else
    printf "Received SIGINT from %d; continuing\n", $_siginfo._sifields._kill.si_pid
    signal SIGINT
  end
end