1.\" Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd June 25, 2003 28.Dt WATCHDOGD 8 29.Os 30.Sh NAME 31.Nm watchdogd 32.Nd Software watchdog daemon 33.Sh SYNOPSIS 34.Nm 35.Op Fl d 36.Op Fl I Ar file 37.Sh DESCRIPTION 38The 39.Nm 40utility interfaces with the kernel's software watchdog facility to ensure 41that the system is in a working state. 42If 43.Nm 44is unable to interface with the kernel over a specific timeout, 45the kernel will take actions to assist in debugging or restarting the computer. 46.Pp 47One possible circumstance which will cause a watchdog timeout is an interrupt 48storm. 49If this occurs, 50.Nm 51will no longer execute and thus the kernel's watchdog routines will take 52action after a configurable timeout. 53.Pp 54Upon receiving the 55.Dv SIGTERM 56or 57.Dv SIGINT 58signals, 59.Nm 60will first instruct the kernel to no longer perform watchdog checks and then 61will terminate. 62.Pp 63The 64.Nm 65utility recognizes the following runtime options: 66.Bl -tag -width ".Fl I Ar file" 67.It Fl I Ar file 68Write the process id of the 69.Nm 70utility in the specified file. 71.It Fl d 72Don't fork. 73When this option is specified, 74.Nm 75will not fork into the background at startup. 76.El 77.Sh FILES 78.Bl -tag -width "/var/run/watchdogd.pid" -compact 79.It Pa /var/run/watchdogd.pid 80.El 81.Sh SEE ALSO 82.Xr watchdog 4 , 83.Xr sysctl 8 84.Sh AUTHORS 85.An -nosplit 86The 87.Nm 88utility and manual page were written by 89.An Sean Kelly Aq smkelly@FreeBSD.org . 90.Pp 91Some contributions made by 92.An Jeff Roberson Aq jeff@FreeBSD.org . 93.Sh HISTORY 94The 95.Nm 96utility appeared in 97.Fx 5.1 . 98