boot(9)

NAME

boot - halt or reboot the system

SYNOPSIS

#include <sys/types.h>
#include <sys/systm.h>
#include <sys/reboot.h>
void
boot(int howto);

DESCRIPTION

The boot() function handles final system shutdown, and ei

ther halts or
reboots the system. The exact action to be taken is deter

mined by the
flags passed in howto and by whether or not the system has

finished autoconfiguration.

If the system has finished autoconfiguration, boot() does

the following:

1. If this is the first invocation of boot() and the

RB_NOSYNC
flag is not set in howto, syncs and unmounts the

system disks
by calling vfs_unmountall(9).

2. Disables interrupts.

3. If rebooting after a crash (i.e., if RB_DUMP is

set in howto,
but RB_HALT is not), saves a system crash dump.

4. Runs any shutdown hooks previously registered.

5. Prints a message indicating that the system is

about to be
halted or rebooted.

6. If RB_HALT is set in howto, halts the system.

Otherwise,
reboots the system.

If the system has not finished autoconfiguration, boot()

runs any shutdown hooks previously registered, prints a message, and

halts the system.

SEE ALSO

vfs_unmountall(9)

BSD February 14, 1997

BSD