How to log the messages generated by c program using syslog-ng and how to manage log file rotation

* How to log the messages generated by c program using syslog-ng and how to manage log file rotation
@ 2014-08-05 14:40 Jean Faye
  2014-08-06  9:08 ` Tr : Help - " Jean Faye
  0 siblings, 1 reply; 2+ messages in thread
From: Jean Faye @ 2014-08-05 14:40 UTC (permalink / raw)
  To: yocto

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Hi all,
I want to use syslog-ng to log the messages generated by my application implemented in C language. I added this in the code:

    char    *log="rtcd";
    printf("[%s] RTC adjustement\n",__func__);
    openlog(log, LOG_PID, LOG_LOCAL0);
    syslog(LOG_DEBUG, "[FIJ] RTC adjustement");
    closelog();

For me, according to the syslog-ng file, the files /var/log/ldb/GENTrace.log, /var/log/ldb/SUTrace.log, /var/log/ldb/WANTrace.log and /var/log/ldb/CPLTrace.log must be created and must contain the syslog message.
But I got no messages in my destination files. You can see the content of my syslog-ng.conf file bellow.

Is it the right way to log the messages sent by C program? What can explain that I got no messages in the destinations files?

I am using syslog-ng 3.5.4.1 provided by yocto. And in the script which run the binary (initscript file) I remove the line below:

. /etc/init.d/functions

Why are you using the line? Is it necessary to use it?

Concerning log file rotation, How can we manage it using syslog-ng? For example I want to have a destination file with a size maximum = 2Mo and if the size is greater than the max size, I have to save the current one and create a new one. On my system I can have max 4 files (4 x 2Mo). How can I manage this kind of rotation?

Thanks in advance.
Best regards,
Ismael Jean FAYE 

@version: 3.5
#
# Syslog-ng configuration file, compatible with default Debian syslogd
# installation. Originally written by anonymous (I can't find his name)
# Revised, and rewrited by me (SZALAY Attila <sasa@debian.org>)

# First, set some global options.
options { chain_hostnames(off); flush_lines(0); use_dns(no); use_fqdn(no);
      owner("root"); group("adm"); perm(0640); stats_freq(0);
      bad_hostname("^gconfd$");create_dirs(yes);
};

########################
# Sources
########################

source s_mysource { 
    pipe("/tmp/pipe" pad_size(2048));
};

########################
# Destinations
########################

destination d_GEN { 
                file("/var/log/ldb/GENTrace.log");
};

destination d_SU { 
                file("/var/log/ldb/SUTrace.log");
};

destination d_WAN { 
                file("/var/log/ldb/WANTrace.log");
};

destination d_CPL { 
                file("/var/log/ldb/CPLTrace.log");
};

########################
# Filters
########################

#filter f_GEN { 
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                #facility(local0);
#};

filter f_SU { 
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};

filter f_WAN { 
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};

filter f_CPL { 
                #facility(local0) and filter(nom_du_composant_applicatif);
                #facility(local0) and filter(f_debug);
                facility(local0);
};

########################
# Log paths
########################

#log { source(s_mysource); filter(f_GEN); destination(d_GEN); };
log { source(s_mysource); filter(f_SU); destination(d_SU); };
log { source(s_mysource); filter(f_WAN); destination(d_WAN); };
log { source(s_mysource); filter(f_CPL); destination(d_CPL); };

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