Mailinglist Archive: opensuse-programming (118 mails)

[Klaus Schneider <klaus.schneider@xxxxxxxxxxxxxxxxxxxxx>]

Hello!

I'm trying to write an app using POSIX timers. But timer_create() fails
everytime I call it with "Resource temporarily unavailable". This must be a 
SuSE problem: The program works on QNX and on my Debian Linux machine at 
home. What could be causing this problem? Perhaps it's something in the SuSE 
kernel or with SuSE's glibc? I have searched through google and mailing lists 
but there was nothing, and I have no idea what to do.
Many Thanks!

Klaus


My System:
Distribution: SuSE 9.2
Linux werckmeister 2.6.8-24.13-default #1 Fri Mar 18 10:19:42 UTC 2005 i686
i686 i386 GNU/Linux
GNU C Library stable release version 2.3.3 (20040917), by Roland McGrath et
al.
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Configured for i686-suse-linux.
Compiled by GNU CC version 3.3.4 (pre 3.3.5 20040809).
Compiled on a Linux 2.6.8.1 system on 2004-10-05.
Available extensions:
        GNU libio by Per Bothner
        crypt add-on version 2.1 by Michael Glad and others
        linuxthreads-0.10 by Xavier Leroy
        GNU Libidn by Simon Josefsson
        NoVersion patch for broken glibc 2.0 binaries
        BIND-8.2.3-T5B
        libthread_db work sponsored by Alpha Processor Inc
        NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
Thread-local storage support included.


My code:
#include <signal.h>
#include <time.h>
#include <stdio.h> /* perror() */

/* prototype */
void timer_handler(int);


int main(void)
{
   struct sigevent sig_spec;
   sigset_t allsigs;
   struct itimerspec tmr_setting;
   timer_t timer_id;
   /* setup signal to respond to timer */
   if (signal(SIGALRM, timer_handler) == SIG_ERR) {
      perror("signal");
      return -1;
   }
   /* create timer, which uses the REALTIME clock */
   sig_spec.sigev_signo = SIGALRM;
   #ifdef __QNX__ /* QNX has slightly other prototype */
   if ((timer_id = timer_create(CLOCK_REALTIME, &sig_spec)) < 0) {
   #else
   sig_spec.sigev_notify = SIGEV_SIGNAL;
   if (timer_create(CLOCK_REALTIME, &sig_spec, &timer_id) < 0) {
   #endif
      perror("timer_create");
      return -1;
   }
   /* set the initial expiration and frequency of timer */
   tmr_setting.it_value.tv_sec = 1;
   tmr_setting.it_value.tv_nsec = 0;
   tmr_setting.it_interval.tv_sec = 1;
   tmr_setting.it_interval.tv_nsec = 0;
   if (timer_settime(timer_id, 0, &tmr_setting, NULL) < 0) {
      perror("settimer");
      return -1;
   }
   /* wait for signals */
   sigemptyset(&allsigs);
   while (1) {
      sigsuspend(&allsigs);
      printf("signal\n");
   }
}

/* signal routine */
void timer_handler(int signum)
{
   printf("timer\n");
}