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-.\" Copyright (c) 1980, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)reboot.2	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD$
-.\"
-.Dd July 10, 2018
-.Dt REBOOT 2
-.Os
-.Sh NAME
-.Nm reboot
-.Nd reboot system or halt processor
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In unistd.h
-.In sys/reboot.h
-.Ft int
-.Fn reboot "int howto"
-.Sh DESCRIPTION
-The
-.Fn reboot
-system call
-reboots the system.
-Only the super-user may reboot a machine on demand.
-However, a reboot is invoked
-automatically in the event of unrecoverable system failures.
-.Pp
-The
-.Fa howto
-argument
-is a mask of options; the system call interface allows the following
-options, defined in the include file
-.In sys/reboot.h ,
-to be passed
-to the new kernel or the new bootstrap and init programs.
-.Bl -tag -width RB_POWERCYCLE
-.It Dv RB_AUTOBOOT
-The default, causing the system to reboot in its usual fashion.
-.It Dv RB_ASKNAME
-Normally the system only prompts the user if the loader specified root
-file system has an error.
-This flag forces it to always prompt the user for the root partition.
-.It Dv RB_DFLTROOT
-Use the compiled in root device.
-Normally, the system uses the device from which it was booted
-as the root device if possible.
-(The default behavior is dependent on the ability of the bootstrap program
-to determine the drive from which it was loaded, which is not possible
-on all systems.)
-.It Dv RB_DUMP
-Dump kernel memory before rebooting; see
-.Xr savecore 8
-for more information.
-.It Dv RB_HALT
-The processor is simply halted; no reboot takes place.
-This option should be used with caution.
-.It Dv RB_POWERCYCLE
-After halting, the shutdown code will do what it can to turn
-off the power and then turn the power back on.
-This requires hardware support, usually an auxiliary microprocessor
-that can sequence the power supply.
-At present only the
-.Xr ipmi 4
-driver implements this feature.
-.It Dv RB_POWEROFF
-After halting, the shutdown code will do what it can to turn
-off the power.
-This requires hardware support.
-.It Dv RB_KDB
-Load the symbol table and enable a built-in debugger in the system.
-This option will have no useful function if the kernel is not configured
-for debugging.
-Several other options have different meaning if combined
-with this option, although their use may not be possible
-via the
-.Fn reboot
-system call.
-See
-.Xr ddb 4
-for more information.
-.It Dv RB_NOSYNC
-Normally, the disks are sync'd (see
-.Xr sync 8 )
-before the processor is halted or rebooted.
-This option may be useful if file system changes have been made manually
-or if the processor is on fire.
-.It Dv RB_REROOT
-Instead of rebooting, unmount all filesystems except the one containing
-currently-running executable, and mount root filesystem using the same
-mechanism which is used during normal boot, based on
-vfs.root.mountfrom
-.Xr kenv 1
-variable.
-.It Dv RB_RDONLY
-Initially mount the root file system read-only.
-This is currently the default, and this option has been deprecated.
-.It Dv RB_SINGLE
-Normally, the reboot procedure involves an automatic disk consistency
-check and then multi-user operations.
-.Dv RB_SINGLE
-prevents this, booting the system with a single-user shell
-on the console.
-.Dv RB_SINGLE
-is actually interpreted by the
-.Xr init 8
-program in the newly booted system.
-.El
-.Pp
-When no options are given (i.e.,
-.Dv RB_AUTOBOOT
-is used), the system is
-rebooted from file
-.Dq kernel
-in the root file system of unit 0
-of a disk chosen in a processor specific way.
-An automatic consistency check of the disks is normally performed
-(see
-.Xr fsck 8 ) .
-.Sh RETURN VALUES
-If successful, this call never returns.
-Otherwise, a -1 is returned and an error is returned in the global
-variable
-.Va errno .
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EPERM
-The caller is not the super-user.
-.El
-.Sh SEE ALSO
-.Xr crash 8 ,
-.Xr halt 8 ,
-.Xr init 8 ,
-.Xr reboot 8 ,
-.Xr savecore 8
-.Sh HISTORY
-The
-.Fn reboot
-system call appeared in
-.Bx 4.0 .