# Opening log file.
# Redirecting OUTPUT and ERR to log file for all threads
open OUTPUT, '>>', "/usr/local/xxx/log/lease.log" or die $!;
open ERROR,  '>>', "/usr/local/xxx/log/lease.log"  or die $!;
STDOUT->fdopen( \*OUTPUT, 'w' ) or die $!;
STDERR->fdopen( \*ERROR,  'w' ) or die $!;