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+.\"	$OpenBSD: log.9,v 1.11 2015/09/14 15:14:55 schwarze Exp $
+.\"     $NetBSD: log.9,v 1.6 1999/08/17 05:24:06 enami Exp $
+.\"
+.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Michael Graff.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd $Mdocdate: September 14 2015 $
+.Dt LOG 9
+.Os
+.Sh NAME
+.Nm log ,
+.Nm addlog
+.Nd log a message from the kernel through the /dev/klog device
+.Sh SYNOPSIS
+.In sys/syslog.h
+.Ft void
+.Fo log
+.Fa "int level"
+.Fa "const char *format"
+.Fa "..."
+.Fc
+.Ft void
+.Fn addlog "const char *format" ...
+.Sh DESCRIPTION
+The
+.Fn log
+function allows the kernel to send formatted messages to user processes
+listening on
+.Pa /dev/klog .
+Usually
+.Xr syslogd 8
+monitors
+.Pa /dev/klog
+for these messages and writes them to a log file.
+.Pp
+All messages are formatted using
+.Xr printf 9 ,
+logged using facility
+.Dv LOG_KERN ,
+and priority level
+.Fa level .
+.Pp
+The
+.Fn addlog
+function is used to build a log message in steps, by adding information
+to an initial call to
+.Fn log .
+.Sh SEE ALSO
+.Xr syslog 3 ,
+.Xr syslogd 8 ,
+.Xr printf 9