198 lines
4.5 KiB
Groff
198 lines
4.5 KiB
Groff
.\" Written Feb 1994 by Steve Greenland (stevegr@neosoft.com)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" from SYSLOG 3 "15 Feb 1994" "Linux" "Linux Programmer's Manual"
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.\" Modified for Minix porting by G. Falzoni <gfalzoni@inwind.it>
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.\"
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.\" Local macros
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.de Xr
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.BR \\$1 (\\$2)\\$3
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..
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.de LB
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.TP \\$1
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\\fB\\$2\\fR
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\\$3
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..
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.de LI
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.TP \\$1
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\\fI\\$2\\fR
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\\$3
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..
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.de LR
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.TP \\$1
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\\fR\\$2\\fR
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\\$3
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..
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.\" end local macros
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.TH SYSLOG 3 "Jan. 18, 2000"
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.SH NAME
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syslog, openlog, closelog \- send messages to the system logger
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.SH SYNOPSIS
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.B #include <syslog.h>
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.sp
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.BI "void openlog(char " *ident ", int " option ", int " facility)
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.sp
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.BI "void syslog(int " priority ", char " *format ", ...)"
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.sp
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.BI "void closelog(void)"
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.sp
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.SH DESCRIPTION
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.B openlog()
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opens a connection to the system logger for a program. The string pointed to by
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.I ident
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is added to each message, and is typically set to the program name. Values for
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.I option
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and
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.I facility
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are given in the next section. Its use is optional. It will automatically be called by
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.B syslog()
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if necessary, in which case
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.I ident
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will default to "syslog".
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.sp
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.B syslog()
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generates a log message, which will be distributed by
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.Xr syslogd 8 .
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.I priority
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is a combination of the
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.I facility
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and the
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.IR level ,
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values for which are given in the next section. The remaining arguments
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are a
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.IR format ,
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as in
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.Xr printf 3
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and any arguments required by the
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.IR format .
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.\" except that the two character %m will be replaced by the error message string
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.\" RI ( strerror )
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.\" corresponding to the present value of
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.\" IR errno .
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.sp
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.B closelog()
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closes the descriptor being used to write to the system logger. Its use is optional.
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.SH "PARAMETERS"
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This section lists the parameters used to set the values of
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.IR option , " facility" ", and " priority .
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.SS option
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The
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.I option
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argument to
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.B openlog()
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is an OR of any of these:
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.TP
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.B LOG_CONS
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write directly to system console if there is an error while sending to
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system logger
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.TP
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.B LOG_NDELAY
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open the connection immediately (normally, the connection is opened when
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the first message is logged)
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.TP
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.B LOG_PERROR
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print to stderr as well
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.TP
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.B LOG_PID
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include PID with each message
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.SS facility
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The
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.I facility
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argument is used to specify what type of program is logging the message.
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This lets the configuration file specify that messages from different
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facilities will be handled differently.
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.TP
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.B LOG_AUTH
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security/authorization messages (DEPRECATED Use
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.B LOG_AUTHPRIV
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instead)
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.TP
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.B LOG_AUTHPRIV
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security/authorization messages (private)
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.TP
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.B LOG_CRON
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clock daemon
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.RB ( cron " and " at )
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.TP
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.B LOG_DAEMON
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other system daemons
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.TP
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.B LOG_KERN
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kernel messages
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.TP
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.BR LOG_LOCAL0 " through " LOG_LOCAL7
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reserved for local use
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.TP
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.B LOG_LPR
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line printer subsystem
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.TP
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.B LOG_MAIL
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mail subsystem
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.TP
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.B LOG_NEWS
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USENET news subsystem
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.TP
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.B LOG_SYSLOG
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messages generated internally by
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.B syslogd
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.TP
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.BR LOG_USER (default)
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generic user-level messages
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.TP
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.B LOG_UUCP
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UUCP subsystem
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.SS level
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This determines the importance of the message. The levels are, in order
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of decreasing importance:
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.TP
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.B LOG_EMERG
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system is unusable
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.TP
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.B LOG_ALERT
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action must be taken immediately
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.TP
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.B LOG_CRIT
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critical conditions
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.TP
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.B LOG_ERR
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error conditions
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.TP
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.B LOG_WARNING
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warning conditions
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.TP
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.B LOG_NOTICE
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normal, but significant, condition
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.TP
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.B LOG_INFO
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informational message
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.TP
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.B LOG_DEBUG
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debug-level message
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.SH HISTORY
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A
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.B syslog
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function call appeared in BSD 4.2.
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.SH SEE ALSO
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.Xr logger 1 ,
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.Xr syslog.conf 5 ,
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.Xr syslogd 8 .
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