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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
commit253e67c8b3a72b3a4757fdbc5845297628db0a4a (patch)
treeadf53b66087aa30dfbf8bf391a1dadb044c3bf4d /static/netbsd/man2/reboot.2
parenta9157ce950dfe2fc30795d43b9d79b9d1bffc48b (diff)
docs: Added All NetBSD Manuals
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+.\" $NetBSD: reboot.2,v 1.29 2010/03/22 19:30:55 joerg Exp $
+.\"
+.\" 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:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" 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
+.\"
+.Dd September 4, 2009
+.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" "char *bootstr"
+.Sh DESCRIPTION
+.Fn reboot
+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
+.Fa howto
+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.
+In addition to the options described below, other options
+described in
+.Xr boothowto 9
+may be set, but such options may be ignored by the system.
+.Pp
+Options can be combined together by OR'ing them, eg.
+.Dv RB_DUMP |
+.Dv RB_NOSYNC
+would be interpreted as
+.Dq dump kernel memory before rebooting and don't sync the disks .
+.Bl -column RB_INITNAMEA 0x0000
+.It Dv RB_AUTOBOOT Ta Li 0x0000 Ta
+The default, causing the system to reboot in its usual fashion.
+.It Dv RB_ASKNAME Ta Li 0x0001 Ta
+Interpreted by the bootstrap program itself, causing it to
+prompt on the console as to what file should be booted.
+Normally, the system is booted from the file
+.Dq Em xx Ns No (0,0)netbsd ,
+where
+.Em xx
+is the default disk name,
+without prompting for the file name.
+.\" Obsolete!
+.\" .It Dv RB_DFLTROOT Ta Li 0x0020 Ta
+.\" 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 Ta Li 0x0100 Ta
+Dump kernel memory before rebooting; see
+.Xr savecore 8
+for more information.
+.It Dv RB_HALT Ta Li 0x0008 Ta
+the processor is simply halted; no reboot takes place.
+This option should be used with caution.
+.It Dv RB_POWERDOWN Ta Li 0x0808 Ta
+This option is always used in conjunction with
+.Dv RB_HALT ,
+and if the system hardware supports the function, the system will be
+powered off, otherwise it has no effect.
+.It Dv RB_INITNAME Ta Li 0x0010 Ta
+An option allowing the specification of an init program (see
+.Xr init 8 )
+other than
+.Pa /sbin/init
+to be run when the system reboots.
+This switch is not currently available.
+.It Dv RB_KDB Ta Li 0x0040 Ta
+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
+call.
+See
+.Xr ddb 4
+for more information.
+.It Dv RB_NOSYNC Ta Li 0x0004 Ta
+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_RDONLY Ta Li 0x0080 Ta
+Initially mount the root file system read-only.
+This is currently the default, and this option has been deprecated.
+.It Dv RB_SINGLE Ta Li 0x0002 Ta
+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.
+.Pp
+When no options are given (i.e.,
+.Dv RB_AUTOBOOT
+is used), the system is
+rebooted from file ``netbsd'' 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 ) .
+.It Dv RB_STRING Ta Li 0x0400 Ta
+.Fa bootstr
+is a string passed to the firmware on the machine, if possible, if this
+option is set.
+Currently this is only implemented on the sparc and the sun3 ports.
+.It Dv RB_USERCONF Ta Li 0x1000 Ta
+Initially invoke the
+.Xr userconf 4
+facility when the system starts up again, if it has been compiled into
+the kernel that is loaded.
+.El
+.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 ddb 4 ,
+.Xr crash 8 ,
+.Xr halt 8 ,
+.Xr init 8 ,
+.Xr reboot 8 ,
+.Xr savecore 8 ,
+.Xr boothowto 9
+.Sh HISTORY
+The
+.Fn reboot
+function call appeared in
+.Bx 4.0 .
+.Pp
+The
+.Dv RB_DFLTROOT
+option is now
+.Em obsolete .