From mboxrd@z Thu Jan  1 00:00:00 1970
From: chikayama@klic.org
To: cygwin@sourceware.cygnus.com
Cc: chikayama@klic.org
Subject: B20.1: Setitimer provides virtual timer?
Date: Tue, 31 Aug 1999 23:49:00 -0000
Message-ID: <19990812112810X.chik@klic.org>
X-SW-Source: 1999-08n/msg00203.html
Message-ID: <19990831234900.-9NF_TUFGSBVI3zlJ9ZlZE_-OEcMohupZFgWhoJ2KF8@z>

"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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