SYSLOG (3)
send messages to the system logger
SYNOPSIS
#include <syslog.h>
void openlog( char *ident , int option , int facility )
void syslog( int priority , char *format , ...)
void closelog( void )
DESCRIPTION
closelog()
closes the descriptor being used to write to the system logger. The use of
closelog()
is optional.
openlog()
opens a connection to the system logger for a program. The string pointed
to by
ident
is added to each message, and is typically set to the program name. Values for
option
and
facility
are given in the next section. The use of
openlog()
is optional; It will automatically be called by
syslog()
if necessary, in which case
ident
will default to NULL.
syslog()
generates a log message, which will be distributed by
syslogd (8).
priority
is a combination of the
facility
and the
level ,
values for which are given in the next section. The remaining arguments
are a
format ,
as in
printf (3)
and any arguments required by the
format ,
except that the two character %m will be replaced by the error message
string
( strerror )
corresponding to the present value of
errno .
PARAMETERS
This section lists the parameters used to set the values of
option , facility , and priority .
The
option
argument to
openlog()
is an OR of any of these:
LOG_CONS
write directly to system console if there is an error while sending to
system logger
LOG_NDELAY
open the connection immediately (normally, the connection is opened when
the first message is logged)
LOG_PERROR
LOG_PID
include PID with each message
The
facility
argument is used to specify what type of program is logging the message.
This lets the configuration file specify that messages from different
facilities will be handled differently.
LOG_AUTH
security/authorization messages (DEPRECATED Use
LOG_AUTHPRIV
instead)
LOG_AUTHPRIV
security/authorization messages (private)
LOG_CRON
clock daemon
( cron and at )
LOG_DAEMON
LOG_KERN
LOG_LOCAL0 through LOG_LOCAL7
LOG_LPR
LOG_MAIL
LOG_NEWS
LOG_SYSLOG
messages generated internally by
syslogd
LOG_USER (default)
generic user-level messages
LOG_UUCP
This determines the importance of the message. The levels are, in order
of decreasing importance:
LOG_EMERG
LOG_ALERT
action must be taken immediately
LOG_CRIT
LOG_ERR
LOG_WARNING
LOG_NOTICE
normal, but significant, condition
LOG_INFO
LOG_DEBUG
HISTORY
A
syslog
function call appeared in BSD 4.2.
SEE ALSO
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