[En-Nut-Discussion] Syslogserver

[Ralf Spettel]

Hello, I had problems with the Syslog Server

If I start syslog with

   setlogserver(ip_syslogserver, 0);

with ip_syslogserver is a _local network_ IP from a nonexisting or switched 
off PC the NutOS
will be very slow. I debug this and found that every send SyslogMsg (via 
vsyslog)
to this IP sents a ARP Request. I check some funktions and install this 
workaround:



// I give the error from NutUdpSendTo back to the highlevel app
//old: void vsyslog(int pri, CONST char *fmt, va_list ap)
//new:
int vsyslog(int pri, CONST char *fmt, va_list ap)
{
...

     if (syslog_server)
     {
         //old: NutUdpSendTo(syslog_sock, syslog_server, syslog_port, 
syslog_buf, cnt);
         //new: if wrong IP and ARP fails, return -1
         return NutUdpSendTo(syslog_sock, syslog_server, syslog_port, 
syslog_buf, cnt);
     }
...
}

and

//old: void syslog(int pri, CONST char *fmt, ...)
int syslog(int pri, CONST char *fmt, ...)
{
     //ralf:
     int result;

     va_list ap;
     va_start(ap, fmt);
     //ralf
     result = vsyslog(pri, (char *) fmt, ap);
     va_end(ap);
//ralf
     return result;
}


// if I get a error I switch off my SyslogMSGs
// simple, but it works well
if ( vsyslog(pri, rp, ap) == -1 ) //Error, maybe wrong IP
{
         SysLogActiv=OFF;
}


Ralf