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.\"     @(#)syslogd.8	8.1 (Berkeley) 6/6/93
.\"	$Id: syslogd.8,v 1.4 1996/07/22 16:35:48 pst Exp $
.\"
.Dd October 12, 1995
.Dt SYSLOGD 8
.Os BSD 4.2
.Sh NAME
.Nm syslogd
.Nd log systems messages
.Sh SYNOPSIS
.Nm syslogd
.Op Fl \&dI
.Op Fl f Ar config_file
.Op Fl m Ar mark_interval
.Op Fl p Ar log_socket
.Sh DESCRIPTION
.Nm Syslogd
reads and logs messages to the system console, log files, other
machines and/or users as specified by its configuration file.
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Put
.Nm syslogd
into debugging mode.  This is probably only of use to developers working on
.Nm syslogd .
.It Fl f
Specify the pathname of an alternate configuration file;
the default is
.Pa /etc/syslog.conf .
.It Fl s
Operate in secure mode.  Do not open a UDP socket to listen for log message
from remote machines.
.It Fl m
Select the number of minutes between ``mark'' messages;
the default is 20 minutes.
.It Fl p
Specify the pathname of an alternate log socket;
the default is
.Pa /var/run/log .
.El
.Pp
.Nm Syslogd
reads its configuration file when it starts up and whenever it
receives a hangup signal.
For information on the format of the configuration file,
see
.Xr syslog.conf 5 .
.Pp
.Nm Syslogd
reads messages from the
.Tn UNIX
domain socket
.Pa /var/run/log ,
from an Internet domain socket specified in
.Pa /etc/services ,
and from the special device
.Pa /dev/klog
(to read kernel messages).
.Pp
.Nm Syslogd
creates the file
.Pa /var/run/syslog.pid ,
and stores its process
id there.
This can be used to kill or reconfigure
.Nm syslogd .
.Pp
The message sent to
.Nm syslogd
should consist of a single line.
The message can contain a priority code, which should be a preceding
decimal number in angle braces, for example,
.Sq Aq 5.
This priority code should map into the priorities defined in the
include file
.Aq Pa sys/syslog.h .
.Sh FILES
.Bl -tag -width /var/run/syslog.pid -compact
.It Pa /etc/syslog.conf
The configuration file.
.It Pa /var/run/syslog.pid
The process id of current
.Nm syslogd .
.It Pa /var/run/log
Name of the
.Tn UNIX
domain datagram log socket.
.Nm syslogd
might also create a symlink from the location of the old default
socket, (/dev/log) so as to assist backwards compatibility.
.It Pa /dev/klog
The kernel log device.
.El
.Sh SEE ALSO
.Xr logger 1 ,
.Xr syslog 3 ,
.Xr services 5 ,
.Xr syslog.conf 5
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.3 .
.Sh BUGS
The ability to log messages received in UDP packets is equivalent to
an unauthenticated remote disk-filling service, and should probably be
disabled by default.  Some sort of
.No inter- Ns Nm syslogd
authentication mechanism ought to be worked out.
The log socket was moved from /dev to ease the use
of a read-only root filesystem. This may confuse some old binaries
and if possible, syslogd will create a symlink to help these programs,
however if the root filesystem is already read only, and the link is not
pre-existing, these binaries will not be able to log messages.