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ls -la /usr/local/nagios/var/nagios.log
-rw-r--r--  1 nagios  nagios  4200 Oct 15 16:41 /usr/local/nagios/var/nagios.log

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chmod g+w /usr/local/nagios/var/nagios.log

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vc70:/usr/local/nagios/var>ll nagios.log
-rw-rw-r--  1 nagios  nagios  5040 Oct 16 12:17 nagios.log

vc70:/usr/local/nagios/var>sudo /etc/rc.d/nagios restart
Running configuration check...done.
Stopping nagios: .done.
Starting nagios: done.

vc70:/usr/local/nagios/var>tail -4 nagios.log
[1381943945] (null)
[1381943945] (null)
[1381943945] (null)
[1381943945] (null)

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        /* write the buffer to the log file */
        fprintf(fp, "[%lu] %s\n", log_time, buffer);
        fprintf(fp, "here %s\n", buffer);

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#make nagios
cd ./base && make
gcc -Wall -g -O2 -DHAVE_CONFIG_H -DNSCORE  -c logging.c
logging.c: In function 'write_to_log':
logging.c:235:2: warning: format '%lu' expects type 'long unsigned int', but argument 3 has type 'time_t'
logging.c:235:2: warning: format '%lu' expects type 'long unsigned int', but argument 3 has type 'time_t'
logging.c: In function 'log_debug_info':
logging.c:558:2: warning: format '%lu' expects type 'long unsigned int', but argument 3 has type 'time_t'
logging.c:558:2: warning: format '%06lu' expects type 'long unsigned int', but argument 4 has type 'suseconds_t'
logging.c:558:2: warning: format '%lu' expects type 'long unsigned int', but argument 3 has type 'time_t'
logging.c:558:2: warning: format '%06lu' expects type 'long unsigned int', but argument 4 has type 'suseconds_t'
gcc -Wall -g -O2 -DHAVE_CONFIG_H -DNSCORE -o nagios nagios.c broker.o nebmods.o ../common/shared.o checks.o config.o commands.o events.o flapping.o logging.o macros-base.o netutils.o notifications.o sehandlers.o skiplist.o utils.o retention-base.o xretention-base.o comments-base.o xcomments-base.o objects-base.o xobjects-base.o statusdata-base.o xstatusdata-base.o perfdata-base.o xperfdata-base.o downtime-base.o xdowntime-base.o    -Wl,-export-dynamic   -lm  -lpthread

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        fprintf(fp, "[%llu] %s\n", log_time, buffer);