1.\" $OpenBSD: log.9,v 1.8 2008/06/26 05:42:08 ray 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: June 26 2008 $ 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 38.Pa /dev/klog 39device 40.Sh SYNOPSIS 41.Fd #include <sys/syslog.h> 42.Ft void 43.Fo "log" 44.Fa "int level" 45.Fa "const char *format" 46.Fa "..." 47.Fc 48.Ft void 49.Fn addlog "const char *format" ... 50.Sh DESCRIPTION 51The 52.Fn log 53function allows the kernel to send formatted messages to user processes 54listening on 55.Pa /dev/klog . 56Usually 57.Xr syslogd 8 58monitors 59.Pa /dev/klog 60for these messages and writes them to a log file. 61.Pp 62All messages are formatted using 63.Xr printf 9 , 64logged using facility 65.Dv LOG_KERN , 66and priority level 67.Fa level . 68.Pp 69The 70.Fn addlog 71function is used to build a log message in steps, by adding information 72to an initial call to 73.Fn log . 74.Sh SEE ALSO 75.Xr syslog 3 , 76.Xr syslogd 8 , 77.Xr printf 9 78