What is the difference between Ctrl-C and SIGINT?

Question

I have been debugging a Python program which segfaults after receiving a KeyboardInterrupt exception. This is normally done by pressing Ctrl+C from t

Answer 1

^C sends a SIGINT to all the processes in the foreground process group. To do the equivalent with kill, you should send the signal to the process group (OS-level concept):

kill -SIGINT -<pid>

or to the job (shell-level concept, the pipeline ended with &):

kill -SIGINT %

Answer 2

As described here :

Python installs a small number of signal handlers by default: SIGPIPE is ignored (so write errors on pipes and sockets can be reported as ordinary Python exceptions) and SIGINT is translated into a KeyboardInterrupt exception. All of these can be overridden.

so, the behaviour should be the same between sending a SIGINT and a Ctrl + c.

But, you have to be carefull with the KeyboardInterrupt, if somewhere in your code you've got a

try:
   ...
except:   # notice the lack of exception class
   pass

this will "eat" the KeyboardInterrupt exception.