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Diffstat (limited to 'lib/libc/sys/reboot.2')
-rw-r--r-- | lib/libc/sys/reboot.2 | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/lib/libc/sys/reboot.2 b/lib/libc/sys/reboot.2 new file mode 100644 index 0000000..0db9ea2 --- /dev/null +++ b/lib/libc/sys/reboot.2 @@ -0,0 +1,158 @@ +.\" 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. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. 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 June 4, 1993 +.Dt REBOOT 2 +.Os BSD 4 +.Sh NAME +.Nm reboot +.Nd reboot system or halt processor +.Sh SYNOPSIS +.Fd #include <unistd.h> +.Fd #include <sys/reboot.h> +.Ft int +.Fn reboot "int howto" +.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 +.Aq Pa sys/reboot.h , +to be passed +to the new kernel or the new bootstrap and init programs. +.Bl -tag -width RB_INITNAMEA +.It Dv RB_AUTOBOOT +The default, causing the system to reboot in its usual fashion. +.It Dv RB_ASKNAME +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)kernel , +where +.Em xx +is the default disk name, +without prompting for the file name. +.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_INITNAME +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 +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 kadb 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_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. +.Pp +When no options are given (i.e., +.Dv RB_AUTOBOOT +is used), the system is +rebooted from file ``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 ) . +.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 kadb 4 , +.Xr crash 8 , +.Xr halt 8 , +.Xr init 8 , +.Xr reboot 8 , +.Xr savecore 8 +.Sh BUGS +The HP300 implementation supports neither +.Dv RB_DFLTROOT +nor +.Dv RB_KDB . +.Sh HISTORY +The +.Nm +function call appeared in +.Bx 4.0 . |