Is it possible to prevent signal handling in software applications?

In C/C++ software applications, it is possible to prevent signal handling by setting the action to SIG_IGN (ignore). This means that when a signal is received, the program will not execute any handler and will simply ignore the signal.

Example of ignoring the SIGINT signal (usually Ctrl+C):

#include <signal.h>
#include <stdio.h>

int main() {
    // Ignore the SIGINT signal
    signal(SIGINT, SIG_IGN);

    printf("Attempt to interrupt the program with Ctrl+C will be ignored.\n");
    while(1) {
        // infinite loop
    }
    return 0;
}

However, it is not possible to completely "prevent" signal handling, as some signals (for example, SIGKILL and SIGSTOP) cannot be caught or ignored. For other signals, you can either set a handler or ignore them.