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boot(9) [freebsd man page]

BOOT(9) 						   BSD Kernel Developer's Manual						   BOOT(9)

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 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 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 call- ing 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 sys- tem. SEE ALSO
vfs_unmountall(9) BSD
February 14, 1997 BSD

Check Out this Related Man Page

REBOOT(2)							System Calls Manual							 REBOOT(2)

reboot - reboot system or halt processor SYNOPSIS
#include <sys/reboot.h> reboot(howto) int howto; DESCRIPTION
Reboot reboots the system, and is invoked automatically in the event of unrecoverable system failures. Howto is a mask of options passed to the bootstrap program. The system call interface permits only RB_HALT or RB_AUTOBOOT to be passed to the reboot program; the other flags are used in scripts stored on the console storage media, or used in manual bootstrap procedures. When none of these options (e.g. RB_AUTOBOOT) is given, the system is rebooted from file "vmunix" 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 then normally performed. The bits of howto are: RB_HALT the processor is simply halted; no reboot takes place. RB_HALT should be used with caution. RB_ASKNAME Interpreted by the bootstrap program itself, causing it to inquire as to what file should be booted. Normally, the system is booted from the file "xx(0,0)vmunix" without asking. RB_SINGLE Normally, the reboot procedure involves an automatic disk consistency check and then multi-user operations. RB_SINGLE prevents the consistency check, rather simply booting the system with a single-user shell on the console. RB_SINGLE is interpreted by the init(8) program in the newly booted system. This switch is not available from the system call interface. Only the super-user may reboot a machine. RETURN VALUES
If successful, this call never returns. Otherwise, a -1 is returned and an error is returned in the global variable errno. ERRORS
[EPERM] The caller is not the super-user. SEE ALSO
crash(8), halt(8), init(8), reboot(8) BUGS
The notion of ``console medium'', among other things, is specific to the VAX. 4th Berkeley Distribution May 9, 1985 REBOOT(2)
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