How do I trigger SIGINT in this program?

#include #include #include #include

void sig_handler(int);

volatile sig_atomic_t cleanup_exit;

int main() { // This variable determines if we should exit our driver loop // Type sig_atomic_t is an integer that is guaranteed to be processed atomically // Atomically means operations cannot be interrupted (no race conditions) // Why atomic? Consider what happens if a signal is received in the handler cleanup_exit = false;

// Install our signal handlers signal(SIGINT, sig_handler); signal(SIGTERM, sig_handler); // Loop until SIGTERM

// Use pkill(1) to send the termination signal SIGTERM puts("Program running..."); while (! cleanup_exit) { ; }

puts("Cleaning up and exiting"); return 0; }

void sig_handler(int sig) { // save errno if you are doing anything that could trigger an error // i.e. anything that is not async-signal-safe int save_errno = errno;

switch (sig) { case SIGINT : puts("CTRL-C pressed"); break; case SIGTERM : puts("SIGTERM received"); cleanup_exit = true; break;

default : printf("%d not handled ", sig); }

errno = save_errno; }