1.\" $NetBSD: rump.halt.1,v 1.2 2010/12/12 17:15:16 pooka Exp $ 2.\" 3.\" Copyright (c) 1990, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)reboot.8 8.1 (Berkeley) 6/9/93 31.\" 32.Dd December 12, 2010 33.Dt RUMP.HALT 1 34.Os 35.Sh NAME 36.Nm rump.halt 37.Nd halt a rump kernel 38.Sh SYNOPSIS 39.Nm 40.Op Fl dhn 41.Sh DESCRIPTION 42The 43.Nm 44utility exits a rump kernel. 45The file system cache, if present, is flushed. 46Since a rump kernel does not control its clients, they are not 47directly affected by 48.Nm . 49However, they will be unable to request further services from the 50halted rump kernel. 51.Pp 52The options are as follows: 53.Bl -tag -width Ds 54.It Fl d 55Create a core dump. 56The core file is saved according to standard userland program 57coredump rules, and can be later examined with a debugger. 58.It Fl h 59By default the process hosting the rump kernel exits. 60Using this option shuts down rump kernel activity, but does not 61cause the hosting process to exit. 62.It Fl n 63Do not flush the file system cache. 64This option should be used with extreme caution. 65It can be used if a virtual disk or a virtual processor is virtually on fire. 66.El 67.Sh SEE ALSO 68.Xr rump 3 69.Sh HISTORY 70The 71.Nm 72command appeared in 73.Nx 6.0 . 74.Sh CAVEATS 75While using 76.Fl h 77makes it impossible to issue further system calls, it does not necessarily 78stop all activity in a rump kernel. 79It is recommended this option is used only for debugging purposes. 80