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#include <signal.h> 
#include <stdlib.h>
#include <string.h>
 
volatile sig_atomic_t sig1 = 0;
volatile sig_atomic_t sig2 = 0;
 
void handler(int signum) { 
  if (sig1) {
     sig2 = 1;
  }
  if (signum == SIGUSR1) {
    sig1 = 1;
  }
} 
 
int main(void) {
  signal(SIGUSR1, handler);
  signal(SIGUSR2, handler);

  while (1) {
    if (sig2) break;
    sleep(SLEEP_TIME);
  }
 
  /* ... */

  return 0;
}

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