41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
// A C program that does not terminate from an interrupt signal.
|
|
// Usually pressing Ctrl-C sends this to the foreground program.
|
|
//
|
|
// To stop this program from running, open another terminal and try
|
|
// > pkill -9 a.out
|
|
// assuming you named the output program a.out
|
|
//
|
|
// This version uses portable signal handler setup
|
|
#include <stdio.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
// Function run when a signals are caught
|
|
void handle_signals(int sig_num) {
|
|
if(sig_num == SIGINT){
|
|
printf("\nNo SIGINT-erruptions allowed.\n");
|
|
}
|
|
else if(sig_num == SIGTERM){
|
|
printf("\nTry to SIGTERM me? Piss off!\n");
|
|
}
|
|
fflush(stdout);
|
|
}
|
|
|
|
int main () {
|
|
// Set handling functions for programs using portable handler setup
|
|
// with sigaction()
|
|
struct sigaction my_sa = {}; // carries information about handler and options
|
|
my_sa.sa_handler = handle_signals; // run function handle_signals
|
|
sigemptyset(&my_sa.sa_mask); // don't block any other signals during handling
|
|
my_sa.sa_flags = SA_RESTART; // restart system calls on signals if possible
|
|
sigaction(SIGTERM, &my_sa, NULL); // register SIGTERM with given action
|
|
sigaction(SIGINT, &my_sa, NULL); // register SIGINT with given action
|
|
|
|
// Infinite loop
|
|
while(1) {
|
|
sleep(1);
|
|
printf("Ma-na na-na!\n");
|
|
fflush(stdout);
|
|
}
|
|
return 0;
|
|
}
|