C program that does not suspend when Ctrl+Z is pressed

Write a C program that doesn’t terminate when Ctrl+Z is pressed. It prints a message “Cannot be suspended using Ctrl+Z” and continues execution.

We can use Unix signal for this. When Ctrl+Z is pressed, SIGTSTP signal is generated.

SIGTSTP signal is sent to a process by its controlling terminal to request it to stop (terminal stop). We can catch this signal and run our own defined signal.
The standard C library function signal() can be used to set up a handler for any of the above signals.



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// C program that does not suspend when
// Ctrl+Z is pressed
#include <stdio.h>
#include <signal.h>
  
// Signal Handler for SIGTSTP
void sighandler(int sig_num)
{
    // Reset handler to catch SIGTSTP next time
    signal(SIGTSTP, sighandler);
    printf("Cannot execute Ctrl+Z\n");
}
  
int main()
{
    // Set the SIGTSTP (Ctrl-Z) signal handler
    // to sigHandler
    signal(SIGTSTP, sighandler);
    while(1)
    {
    }
    return 0;
}

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Output:

Cannot execute Ctrl+Z

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