Question

I am working in the Linux environment, and I have a C++ program, what I want is when I cancel the program with ctrl+c I would like that the program executes a function, to close some files and print some sutff, is there any way to do this?. Thank you.

Answer 1

signal() can be dangerous on some OSes and is deprecated on Linux in favor of sigaction(). ‘signal versus sigaction’

Here’s an example that I ran across recently (‘Tap the interrupt signal’) and modified as I was playing around with it.

#include<stdio.h> #include<unistd.h> #include<signal.h> #include<string.h>  struct sigaction old_action;  void sigint_handler(int sig_no) {     printf('CTRL-C pressed\n');     sigaction(SIGINT, &old_action, NULL);     kill(0, SIGINT); }  int main() {      struct sigaction action;     memset(&action, 0, sizeof(action));     action.sa_handler = &sigint_handler;     sigaction(SIGINT, &action, &old_action);      pause();      return 0; }