A question of libqb

[GitSoftwareNow]

what does libqb do that in the code to print such this information on the file of /var/log/messages? how do you called the syslog function ? what's the first arguemet do you used in the CentOS? Do you used the macro of LOG_DEBUG?
Jul 14 15:04:46 debug [TOTEM ] totemip_parse: IPv4 address of 192.168.41.218 resolved as 192.168.41.218
In the file totemip.c use log_printf ,the first arguement uses LOG_DEBUG can print message on /var/log/messages .why?