B20.1: Setitimer provides virtual timer?

chikayama@klic.org chikayama@klic.org
Wed Aug 11 19:26:00 GMT 1999


"setitimer(ITIMER_VIRTUAL, ...)" does not seem to deliver SIGVTALRM
signals.  The test program included below, that sets the process timer
and loops awaiting for timer expiration, will loop forever.  However,
running this in background and sending the signal by "kill -VTALRM ..."
from the shell will terminate it as expected (with an exclamation mark 
output).

Is this the spec. of the current release or a bug?

# I really enjoy using Cygwin.  Thank you for your efforts!

-- Takashi Chikayama@Dept. of Frontier Informatics., the Univ. of Tokyo
-- Tel. +81-3-5841-6658; Fax. +81-3-5841-8572
-- E-mail chikayama@klic.org; Home page http://www.logos.t.u-tokyo.ac.jp

#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>

volatile int time_has_come;

void handler(int signal)
{
  time_has_come = 1;
  fprintf(stderr, "!\n");
  return;
}

struct itimerval interval;

int main(int argc, char * const argv[])
{
  interval.it_interval.tv_sec = 0;
  interval.it_interval.tv_usec = 0;
  interval.it_value.tv_sec = 1;
  interval.it_value.tv_usec = 0;
  signal(SIGVTALRM, handler);
  (void) setitimer(ITIMER_VIRTUAL, &interval, NULL);
  time_has_come = 0;
  while (1) {
    if (time_has_come) {
      exit(0);
    }
  }
}

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