mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-09-11 14:54:54 +00:00
274 lines
6.9 KiB
Groff
274 lines
6.9 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)syslog.3 8.1 (Berkeley) 6/4/93
|
|
.\"
|
|
.TH SYSLOG 3 "28 January 1997" GNO "Library Routines"
|
|
.SH NAME
|
|
.BR syslog ,
|
|
.BR vsyslog ,
|
|
.BR openlog ,
|
|
.BR closelog ,
|
|
.BR setlogmask
|
|
\- control system log
|
|
.SH SYNOPSIS
|
|
#include <syslog.h>
|
|
.br
|
|
#include <varargs.h>
|
|
.sp 1
|
|
void
|
|
\fBsyslog\fR (int \fIpriority\fR, const char *\fImessage\fR, ...);
|
|
.br
|
|
void
|
|
\fBvsyslog\fR (int \fIpriority\fR, const char *\fImessage\fR,
|
|
va_list \fBargs\fR);
|
|
.br
|
|
void
|
|
\fBopenlog\fR (const char *\fIident\fR, int \fIlogopt\fR, int \fIfacility\fR);
|
|
.br
|
|
void
|
|
\fBcloselog\fR (void);
|
|
.br
|
|
int
|
|
\fBsetlogmask\fR (int \fImaskpri\fR);
|
|
.SH DESCRIPTION
|
|
The
|
|
.BR syslog
|
|
function
|
|
writes
|
|
.I message
|
|
to the system message logger.
|
|
The message is then written to the system console, log files,
|
|
logged-in users, or forwarded to other machines as appropriate. (See
|
|
.BR syslogd (8).)
|
|
.LP
|
|
The message is identical to a
|
|
.BR printf (3)
|
|
format string, except that
|
|
.BR %m
|
|
is replaced by the current error
|
|
message. (As denoted by the global variable
|
|
.IR errno ;
|
|
see
|
|
.BR strerror (3).)
|
|
A trailing newline is added if none is present.
|
|
.LP
|
|
The
|
|
.BR vsyslog
|
|
function
|
|
is an alternate form in which the arguments have already been captured
|
|
using the variable-length argument facilities of
|
|
.BR varargs (3).
|
|
.LP
|
|
The message is tagged with
|
|
.IR priority .
|
|
Priorities are encoded as a
|
|
.I facility
|
|
and a
|
|
.IR level .
|
|
The facility describes the part of the system
|
|
generating the message.
|
|
The level is selected from the following
|
|
.IR ordered
|
|
(high to low) list:
|
|
.RS
|
|
.IP "\fBLOG_EMERG\fR"
|
|
A panic condition.
|
|
This is normally broadcast to all users.
|
|
.IP "\fBLOG_ALERT\fR"
|
|
A condition that should be corrected immediately, such as a corrupted
|
|
system database.
|
|
.IP "\fBLOG_CRIT\fR"
|
|
Critical conditions, e.g., hard device errors.
|
|
.IP "\fBLOG_ERR\fR"
|
|
Errors.
|
|
.IP "\fBLOG_WARNING\fR"
|
|
Warning messages.
|
|
.IP "\fBLOG_NOTICE\fR"
|
|
Conditions that are not error conditions,
|
|
but should possibly be handled specially.
|
|
.IP "\fBLOG_INFO\fR"
|
|
Informational messages.
|
|
.IP "\fBLOG_DEBUG\fR"
|
|
Messages that contain information
|
|
normally of use only when debugging a program.
|
|
.RE
|
|
.LP
|
|
The
|
|
.BR openlog
|
|
function
|
|
provides for more specialized processing of the messages sent
|
|
by
|
|
.BR syslog
|
|
and
|
|
.BR vsyslog .
|
|
The parameter
|
|
.I ident
|
|
is a string that will be prepended to every message.
|
|
The
|
|
.I logopt
|
|
argument
|
|
is a bit field specifying logging options, which is formed by
|
|
.BR OR 'ing
|
|
one or more of the following values:
|
|
.RS
|
|
.IP "\fBLOG_CONS\fR"
|
|
If
|
|
.BR syslog
|
|
cannot pass the message to
|
|
.BR syslogd (8)
|
|
it will attempt to write the message to the console
|
|
.BR .ttyco .
|
|
.IP "\fBLOG_NDELAY\fR"
|
|
Open the connection to
|
|
.BR syslogd (8)
|
|
immediately.
|
|
Normally the open is delayed until the first message is logged.
|
|
Useful for programs that need to manage the order in which file
|
|
descriptors are allocated.
|
|
.IP "\fBLOG_PERROR\fR"
|
|
Write the message to standard error output as well to the system log.
|
|
.IP "\fBLOG_PID\fR"
|
|
Log the process id with each message: useful for identifying
|
|
instantiations of daemons.
|
|
.RE
|
|
.LP
|
|
The
|
|
.I facility
|
|
parameter encodes a default facility to be assigned to all messages
|
|
that do not have an explicit facility encoded:
|
|
.RS
|
|
.IP "\fBLOG_AUTH\fR"
|
|
The authorization system:
|
|
.BR login (1),
|
|
.BR su (1),
|
|
.BR getty (8),
|
|
etc.
|
|
.IP "\fBLOG_AUTHPRIV\fR"
|
|
The same as
|
|
.BR LOG_AUTH ,
|
|
but logged to a file readable only by
|
|
selected individuals.
|
|
.IP "\fBLOG_CRON\fR"
|
|
The cron daemon:
|
|
.BR cron (8).
|
|
.IP "\fBLOG_DAEMON\fR"
|
|
System daemons, such as
|
|
.BR routed (8),
|
|
that are not provided for explicitly by other facilities.
|
|
.IP "\fBLOG_FTP\fR"
|
|
The file transfer protocol daemon:
|
|
.BR ftpd (8).
|
|
.IP "\fBLOG_KERN\fR"
|
|
Messages generated by the kernel.
|
|
These cannot be generated by any user processes.
|
|
.IP "\fBLOG_LPR\fR"
|
|
The line printer spooling system:
|
|
.BR lpr (1),
|
|
.BR lpc (8),
|
|
.BR lpd (8),
|
|
etc.
|
|
.IP "\fBLOG_MAIL\fR"
|
|
The mail system.
|
|
.IP "\fBLOG_NEWS\fR"
|
|
The network news system.
|
|
.IP "\fBLOG_SYSLOG\fR"
|
|
Messages generated internally by
|
|
.BR syslogd (8).
|
|
.IP "\fBLOG_USER\fR"
|
|
Messages generated by random user processes.
|
|
This is the default facility identifier if none is specified.
|
|
.IP "\fBLOG_UUCP\fR"
|
|
The uucp system.
|
|
.IP "\fBLOG_LOCAL0\fR"
|
|
Reserved for local use.
|
|
Similarly for
|
|
.BR LOG_LOCAL1
|
|
through
|
|
.BR LOG_LOCAL7 .
|
|
.RE
|
|
.LP
|
|
The
|
|
.BR closelog
|
|
function
|
|
can be used to close the log file.
|
|
.LP
|
|
The
|
|
.BR setlogmask
|
|
function
|
|
sets the log priority mask to
|
|
.I maskpri
|
|
and returns the previous mask.
|
|
Calls to
|
|
.BR syslog
|
|
with a priority not set in
|
|
.I maskpri
|
|
are rejected.
|
|
The mask for an individual priority
|
|
.I pri
|
|
is calculated by the macro
|
|
.BR LOG_MASK pri ;
|
|
the mask for all priorities up to and including
|
|
.I toppri
|
|
is given by the macro
|
|
.BR LOG_UPTO toppri ; .
|
|
The default allows all priorities to be logged.
|
|
.SH RETURN VALUES
|
|
The routines
|
|
.BR closelog ,
|
|
.BR openlog ,
|
|
.BR syslog
|
|
and
|
|
.BR vsyslog
|
|
return no value.
|
|
.LP
|
|
The routine
|
|
.BR setlogmask
|
|
always returns the previous log mask level.
|
|
.SH EXAMPLES
|
|
.nf
|
|
syslog(LOG_ALERT, "who: internal error 23");
|
|
|
|
openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
|
|
|
|
setlogmask(LOG_UPTO(LOG_ERR));
|
|
|
|
syslog(LOG_INFO, "Connection from host %d", CallingHost);
|
|
|
|
syslog(LOG_INFO|LOG_LOCAL2, "foobar error: %m");
|
|
.fi
|
|
.SH SEE ALSO
|
|
.BR logger (1),
|
|
.BR syslogd (8)
|
|
.SH HISTORY
|
|
These
|
|
functions appeared in 4.2BSD.
|