C exit from infinite loop on keypress

Question

How can I exit from an infinite loop, when a key is pressed? Currently I\'m using getch, but it will start blocking my loop as soon, as there is no more input to read.

Answer 1

If you do not want to use non-standard, non-blocking way and yet graceful exit. Use signals and Ctrl+C with user provided signal handler to clean up. Something like this:

#include 
#include 
#include 

/* Signal Handler for SIGINT */
void sigint_handler(int sig_num)
{
    /* Reset handler to catch SIGINT next time.
       Refer http://en.cppreference.com/w/c/program/signal */
    printf("\n User provided signal handler for Ctrl+C \n");

    /* Do a graceful cleanup of the program like: free memory/resources/etc and exit */
    exit(0);
}

int main ()
{
    signal(SIGINT, sigint_handler);

    /* Infinite loop */
    while(1)
    {
        printf("Inside program logic loop\n");
    }
    return 0;
}