new file:   ch13/a.out
 	new file:   ch13/already_running.c
 	new file:   ch13/daemonize.c
 	new file:   ch13/daemonize.o
 	new file:   ch13/debug
 	new file:   ch13/exam13_3.c
 	new file:   ch13/prog13_1.c
 	new file:   ch13/prog13_2.c
 	new file:   ch13/prog13_3.c
 	new file:   ch13/syslog
 	modified:   ch13/syslog.c
 	modified:   include/debug.h
 	modified:   include/public.h