1.\" $OpenBSD: log.9,v 1.11 2015/09/14 15:14:55 schwarze Exp $ 2.\" $NetBSD: log.9,v 1.6 1999/08/17 05:24:06 enami Exp $ 3.\" 4.\" Copyright (c) 1997 The NetBSD Foundation, Inc. 5.\" All rights reserved. 6.\" 7.\" This code is derived from software contributed to The NetBSD Foundation 8.\" by Michael Graff. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29.\" POSSIBILITY OF SUCH DAMAGE. 30.\" 31.Dd $Mdocdate: September 14 2015 $ 32.Dt LOG 9 33.Os 34.Sh NAME 35.Nm log , 36.Nm addlog 37.Nd log a message from the kernel through the /dev/klog device 38.Sh SYNOPSIS 39.In sys/syslog.h 40.Ft void 41.Fo log 42.Fa "int level" 43.Fa "const char *format" 44.Fa "..." 45.Fc 46.Ft void 47.Fn addlog "const char *format" ... 48.Sh DESCRIPTION 49The 50.Fn log 51function allows the kernel to send formatted messages to user processes 52listening on 53.Pa /dev/klog . 54Usually 55.Xr syslogd 8 56monitors 57.Pa /dev/klog 58for these messages and writes them to a log file. 59.Pp 60All messages are formatted using 61.Xr printf 9 , 62logged using facility 63.Dv LOG_KERN , 64and priority level 65.Fa level . 66.Pp 67The 68.Fn addlog 69function is used to build a log message in steps, by adding information 70to an initial call to 71.Fn log . 72.Sh SEE ALSO 73.Xr syslog 3 , 74.Xr syslogd 8 , 75.Xr printf 9 76