2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
185 lines
6.1 KiB
Groff
185 lines
6.1 KiB
Groff
.\" $NetBSD: reboot.2,v 1.29 2010/03/22 19:30:55 joerg Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)reboot.2 8.1 (Berkeley) 6/4/93
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.\"
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.Dd September 4, 2009
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.Dt REBOOT 2
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.Os
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.Sh NAME
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.Nm reboot
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.Nd reboot system or halt processor
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.In sys/reboot.h
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.Ft int
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.Fn reboot "int howto" "char *bootstr"
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.Sh DESCRIPTION
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.Fn reboot
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reboots the system.
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Only the super-user may reboot a machine on demand.
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However, a reboot is invoked
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automatically in the event of unrecoverable system failures.
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.Pp
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.Fa howto
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is a mask of options; the system call interface allows the following
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options, defined in the include file
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.In sys/reboot.h ,
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to be passed
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to the new kernel or the new bootstrap and init programs.
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In addition to the options described below, other options
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described in
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.Xr boothowto 9
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may be set, but such options may be ignored by the system.
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.Pp
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Options can be combined together by OR'ing them, eg.
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.Dv RB_DUMP |
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.Dv RB_NOSYNC
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would be interpreted as
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.Dq dump kernel memory before rebooting and don't sync the disks .
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.Bl -column RB_INITNAMEA 0x0000
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.It Dv RB_AUTOBOOT Ta Li 0x0000 Ta
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The default, causing the system to reboot in its usual fashion.
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.It Dv RB_ASKNAME Ta Li 0x0001 Ta
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Interpreted by the bootstrap program itself, causing it to
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prompt on the console as to what file should be booted.
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Normally, the system is booted from the file
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.Dq Em xx Ns No (0,0)netbsd ,
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where
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.Em xx
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is the default disk name,
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without prompting for the file name.
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.\" Obsolete!
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.\" .It Dv RB_DFLTROOT Ta Li 0x0020 Ta
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.\" Use the compiled in root device.
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.\" Normally, the system uses the device from which it was booted
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.\" as the root device if possible.
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.\" (The default behavior is dependent on the ability of the bootstrap program
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.\" to determine the drive from which it was loaded, which is not possible
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.\" on all systems.)
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.It Dv RB_DUMP Ta Li 0x0100 Ta
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Dump kernel memory before rebooting; see
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.Xr savecore 8
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for more information.
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.It Dv RB_HALT Ta Li 0x0008 Ta
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the processor is simply halted; no reboot takes place.
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This option should be used with caution.
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.It Dv RB_POWERDOWN Ta Li 0x0808 Ta
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This option is always used in conjunction with
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.Dv RB_HALT ,
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and if the system hardware supports the function, the system will be
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powered off, otherwise it has no effect.
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.It Dv RB_INITNAME Ta Li 0x0010 Ta
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An option allowing the specification of an init program (see
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.Xr init 8 )
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other than
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.Pa /sbin/init
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to be run when the system reboots.
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This switch is not currently available.
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.It Dv RB_KDB Ta Li 0x0040 Ta
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Load the symbol table and enable a built-in debugger in the system.
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This option will have no useful function if the kernel is not configured
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for debugging.
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Several other options have different meaning if combined
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with this option, although their use may not be possible
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via the
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.Fn reboot
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call.
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See
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.Xr ddb 4
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for more information.
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.It Dv RB_NOSYNC Ta Li 0x0004 Ta
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Normally, the disks are sync'd (see
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.Xr sync 8 )
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before the processor is halted or rebooted.
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This option may be useful if file system changes have been made manually
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or if the processor is on fire.
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.It Dv RB_RDONLY Ta Li 0x0080 Ta
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Initially mount the root file system read-only.
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This is currently the default, and this option has been deprecated.
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.It Dv RB_SINGLE Ta Li 0x0002 Ta
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Normally, the reboot procedure involves an automatic disk consistency
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check and then multi-user operations.
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.Dv RB_SINGLE
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prevents this, booting the system with a single-user shell
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on the console.
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.Dv RB_SINGLE
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is actually interpreted by the
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.Xr init 8
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program in the newly booted system.
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.Pp
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When no options are given (i.e.,
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.Dv RB_AUTOBOOT
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is used), the system is
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rebooted from file ``netbsd'' in the root file system of unit 0
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of a disk chosen in a processor specific way.
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An automatic consistency check of the disks is normally performed
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(see
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.Xr fsck 8 ) .
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.It Dv RB_STRING Ta Li 0x0400 Ta
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.Fa bootstr
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is a string passed to the firmware on the machine, if possible, if this
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option is set.
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Currently this is only implemented on the sparc and the sun3 ports.
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.It Dv RB_USERCONF Ta Li 0x1000 Ta
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Initially invoke the
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.Xr userconf 4
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facility when the system starts up again, if it has been compiled into
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the kernel that is loaded.
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.El
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.Sh RETURN VALUES
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If successful, this call never returns.
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Otherwise, a \-1 is returned and an error is returned in the global
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variable
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.Va errno .
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EPERM
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The caller is not the super-user.
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.El
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.Sh SEE ALSO
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.Xr ddb 4 ,
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.Xr crash 8 ,
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.Xr halt 8 ,
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.Xr init 8 ,
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.Xr reboot 8 ,
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.Xr savecore 8 ,
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.Xr boothowto 9
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.Sh HISTORY
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The
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.Fn reboot
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function call appeared in
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.Bx 4.0 .
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.Pp
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The
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.Dv RB_DFLTROOT
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option is now
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.Em obsolete .
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