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.
// C program that does not suspend when// Ctrl+Z is pressed#include <stdio.h>#include <signal.h> // Signal Handler for SIGTSTPvoid 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;} |
Output:
Cannot execute Ctrl+Z
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