1.\" $OpenBSD: log.9,v 1.6 2002/08/08 23:02:58 aaron 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.\" 3. All advertising materials mentioning features or use of this software 19.\" must display the following acknowledgement: 20.\" This product includes software developed by the NetBSD 21.\" Foundation, Inc. and its contributors. 22.\" 4. Neither the name of The NetBSD Foundation nor the names of its 23.\" contributors may be used to endorse or promote products derived 24.\" from this software without specific prior written permission. 25.\" 26.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36.\" POSSIBILITY OF SUCH DAMAGE. 37.\" 38.Dd May 12, 1997 39.Dt LOG 9 40.Os 41.Sh NAME 42.Nm log , 43.Nm addlog 44.Nd log a message from the kernel through the 45.Pa /dev/klog 46device 47.Sh SYNOPSIS 48.Fd #include <sys/syslog.h> 49.Ft void 50.Fo "log" 51.Fa "int level" 52.Fa "const char *format" 53.Fa "..." 54.Fc 55.Ft void 56.Fn addlog "const char *format" ... 57.Sh DESCRIPTION 58The 59.Fn log 60function allows the kernel to send formatted messages to user processes 61listening on 62.Pa /dev/klog . 63Usually 64.Xr syslogd 8 65monitors 66.Pa /dev/klog 67for these messages and writes them to a log file. 68.Pp 69All messages are formatted using 70.Xr printf 9 , 71logged using facility 72.Dv LOG_KERN , 73and priority level 74.Fa level . 75.Pp 76The 77.Fn addlog 78function is used to build a log message in steps, by adding information 79to an initial call to 80.Fn log . 81.Sh SEE ALSO 82.Xr syslog 3 , 83.Xr syslogd 8 , 84.Xr printf 9 85