mahoney@shannon:ecf$ more snooze2
snooze2    snooze2.c  
mahoney@shannon:ecf$ more snooze2.c
/***********
 * snooze2.c
 * 
 *  on shannon : 
 *  $ gcc -O -pthread csapp.c snooze.c -o snooze
 *  $ ./snooze 10   # control-c 
 * 
 * Minor changes to snooze.c
 * from Bryant, Randal E., David O'Hallaron. Computer Systems, 3rd Edition. 
 ***********/
#include "csapp.h"
void sigint_handler(int sig){
  return; /* Catch the signal and return */
}
void snooze(unsigned int secs) {
  unsigned int slept = sleep(secs);
  printf ("Slept for %d of %d secs.\n", secs - slept, secs);
}
int main(int argc, char **argv) {
  if (argc != 2) {
    fprintf (stderr, "usage: %s <secs>\n", argv[0]);
    exit(0);
  }
  if (signal(SIGINT, sigint_handler) == SIG_ERR){ /* install sigint handler */
    unix_error("signal error\n");
  }
  snooze(atoi(argv [1]));
  exit(0);
}