reboot (8) ( FreeBSD man: Команды системного администрирования )
reboot (8) ( Linux man: Команды системного администрирования )
BSD mandoc
NAME
reboot
- reboot system or halt processor
LIBRARY
Lb libc
SYNOPSIS
#include <unistd.h>
#include <sys/reboot.h> int
reboot (int howto);
DESCRIPTION
The
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.
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.
RB_AUTOBOOT
The default, causing the system to reboot in its usual fashion.
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
``xx (0,0)kernel
''
where
xx
is the default disk name,
without prompting for the file name.
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.)
RB_DUMP
Dump kernel memory before rebooting; see
savecore(8)
for more information.
RB_HALT
the processor is simply halted; no reboot takes place.
This option should be used with caution.
RB_POWEROFF
After halting, the shutdown code will do what it can to turn
off the power.
This requires hardware support.
RB_INITNAME
An option allowing the specification of an init program (see
init(8))
other than
/sbin/init
to be run when the system reboots.
This switch is not currently available.
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
reboot ();
system call.
See
ddb(4)
for more information.
RB_NOSYNC
Normally, the disks are sync'd (see
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.
RB_RDONLY
Initially mount the root file system read-only.
This is currently the default, and this option has been deprecated.
RB_SINGLE
Normally, the reboot procedure involves an automatic disk consistency
check and then multi-user operations.
RB_SINGLE
prevents this, booting the system with a single-user shell
on the console.
RB_SINGLE
is actually interpreted by the
init(8)
program in the newly booted system.
When no options are given (i.e.,
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
fsck(8)).
RETURN VALUES
If successful, this call never returns.
Otherwise, a -1 is returned and an error is returned in the global
variable
errno
