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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 (sig1signum == SIGUSR1) {
    sig1 sig2 = 1;
  }
  else if (signum == SIGUSR1sig1) {
     sig1sig2 = 1;
  }
}

int main(void) {
  signal(SIGUSR1, handler);
  signal(SIGUSR2, handler);

  while (1sig2 == 0) {
    /* do nothing or ifgive (sig2) break;
    sleep(SLEEP_TIME);up CPU for a while */
  }

  /* ... */

  return 0;
}

#include <signal.h>
#include <stdlib.h>
#include <string.h>

volatile sig_atomic_t sig1 = 0;
volatile sig_atomic_t sig2 = 0;

void sig1_handler(int signum) {
  sig1 = 1;
}

void sig2_handler(int signum) {
  sig2 = 1;
}

int main(void) {
  signal(SIGUSR1, sig1_handler);
  signal(SIGUSR2, sig2SIG_handlerIGN);

  while (1sig1 == 0) {
    /* do nothing or ifgive (sig1) break;
    sleep(SLEEP_TIME);up CPU for a while */
  }

  /* ... */
signal(SIGUSR2, sig2_handler);
  while (1sig2 == 0) {
    /* do if (sig2) break;
    sleep(SLEEP_TIME);nothing or give up CPU for a while */
  }

  /* ... */

  return 0;
}