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/usr/share/doc/coccinelle-doc/examples/itimer.c is in coccinelle-doc 1.0.0~rc10.deb-1ubuntu1.

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int do_setitimer(int which, struct itimerval *value, 
                 struct itimerval *ovalue)
{
   unsigned long expire;
   cputime_t cputime;
   int k;
   if (ovalue && (k = do_getitimer(which, ovalue)) < 0)
     return k;
   switch (which) {
     case ITIMER_VIRTUAL:
       cputime = timeval_to_cputime(&value->it_value);
      if (cputime_eq(cputime, cputime_zero))
	  cputime = jiffies_to_cputime(1);
       current->it_virt_value = cputime;
       cputime = timeval_to_cputime(&value->it_interval);
       current->it_virt_incr = cputime;
       break;
     case ITIMER_PROF:
       cputime = timeval_to_cputime(&value->it_value);
        if (cputime_eq(cputime, cputime_zero))
	    cputime = jiffies_to_cputime(1);
         current->it_prof_value = cputime;
         cputime = timeval_to_cputime(&value->it_interval);
         current->it_prof_incr = cputime;
         break;
       default:
         return -EINVAL;
   }
   return 0;
}