As you expected, changing the syslog call from
syslog( LOG_ERR | LOG_LOCAL4, head->text );
to
syslog( LOG_ERR | LOG_LOCAL4, "%s", head->text );
did not change anything.
To track down the problem further, I have made a small test application :
#include <stdlib.h>
#include <stdio.h>
#include <native/task.h>
#include <native/timer.h>
#include <rtdk.h>
int main( int arc, char *argv[] )
{
int i;
rt_print_auto_init(1);
rt_printf("--------------- TEST RT-PRINTF 1 ------------\n");
sleep(1);
daemon(0,0);
rt_print_auto_init(1);
rt_printf("--------------- TEST RT-PRINTF 2 ------------\n");
sleep(10);
return(0);
}
This application gives the following results :
- If the daemon() function is not called, all rt_printf() do work well
and output is shown in syslog
- If daemon() function is called, and first call to sleep(1) is omitted,
there is no output in the syslog whatsoever.
- If daemon() function is called, and first call to sleep(1) is executed,
there is output of the first rt_printf in the syslog but not of the second
one.
I do not have any idea why daemonizing of the process is not giving
any output to the syslog.
Oliver
-------- Original Message --------
Subject: Re: Re-6: [Xenomai-help] rt_printf with daemonized task (07-Okt-2009
15:49)
From: Gilles Chanteperdrix <[email protected]>
To: [email protected]
> [email protected] wrote:
> >
> >
> > in the glibc documentation it's specified as a void function :
> >
> > 18.2.2 syslog, vsyslog
> >
> > The symbols referred to in this section are declared in the file syslog.h.
> > — Function: void syslog (int facility_priority, char *format, ...)
>
> So, the first argument is a format string? You should pass "%s" followed
> by head->text then, not head->text directly. If head->text contains the
> % characters, you will get errors. I do not think fixing this will fix
> your issues though.
>
> I have no idea why it fails. Did you try to put a printf as well as the
> syslog call to check whether syslog is really called? Are you 100% sure
> that you do not close file descriptors when daemonizing your process?
>
>
> --
> Gilles
>
To: [email protected]
Cc: [email protected]
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