boot - halt or reboot the system
The boot() function handles final system shutdown, and either halts or
reboots the system. The exact action to be taken is determined by the
flags passed in howto and by whether or not the system has
If the system has finished autoconfiguration, boot() does
1. Sets the boothowto system variable from the howto
2. If this is the first invocation of boot() and the
flag is not set in howto, syncs and unmounts the
by calling vfs_shutdown(9) and sets the time of
day clock by
3. Disables interrupts.
4. If rebooting after a crash (i.e., if RB_DUMP is
set in howto,
but RB_HALT is not), saves a system crash dump.
5. Runs any shutdown hooks by calling doshutdownhooks(9).
6. Prints a message indicating that the system is
about to be
halted or rebooted.
7. If RB_HALT is set in howto, halts the system.
If the system has not finished autoconfiguration, boot()
runs any shutdown
hooks by calling doshutdownhooks(9), prints a message,
and halts the
system (unless RB_USERREQ is specified, in which case the
system will be
halted if RB_HALT is given, and rebooted otherwise; see reboot(2) for
reboot(2), doshutdownhooks(9), resettodr(9), vfs_shutdown(9)
OpenBSD 3.6 November 13, 1995
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