reboot - Reboot or halt the system
int howto );
Specifies a mask of options.
The reboot() function restarts the system. The default
startup is automatic and brings up /vmunix in the normal,
nonmaintenance mode. In an application, the calling process
must have superuser privilege to use this function.
However, a reboot is invoked automatically in the event of
unrecoverable system failures.
The following flags, defined in the <sys/reboot.h> header
file, may be passed to the kernel bootstrap process by
applications. These flags are supplied as values to the
howto parameter. The default, causing the system to
reboot in its usual fashion. Dump kernel memory before
rebooting; see savecore(8) for more information. The processor
is simply halted; no reboot takes place. The disks
are not sync'ed before the processor is halted or
rebooted. Normally, the disks are sync'ed before the processor
is halted or rebooted. See sync(8) for more information.
Because the disks are not sync'ed when you specify
the RB_NOSYNC option, loss of data may result from
If no flags are specified (equivalent to RB_AUTOBOOT), the
system is rebooted from file vmunix in the root file system.
RB_* flags that are defined in the <sys/reboot.h> header
file and not listed in this reference page are reserved
for internal use only.
If successful, this call does not return. Otherwise, -1
is returned and errno is set to indicate the error.
If the reboot() function fails, errno may be set to the
following value: The calling process does not have appropriate
Commands: crashdc(8), halt(8), reboot(8), savecore(8),
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