| REBOOT(2) | System Calls Manual | REBOOT(2) | 
reboot —
#include <unistd.h>
#include <sys/reboot.h>
int
  
  reboot(int
    howto, char
    *bootstr);
reboot() 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.
howto is a mask of options; the system call
    interface allows the following options, defined in the include file
    <sys/reboot.h>, to be passed
    to the new kernel or the new bootstrap and init programs. In addition to the
    options described below, other options described in
    boothowto(9) may be set,
    but such options may be ignored by the system.
Options can be combined together by OR'ing them, eg.
    RB_DUMP | RB_NOSYNC would be
    interpreted as “dump kernel memory before rebooting and don't sync
    the disks”.
| RB_AUTOBOOT | 0x0000 | The default, causing the system to reboot in its usual fashion. | 
| RB_ASKNAME | 0x0001 | 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)netbsd”, where xx is the default disk name, without prompting for the file name. | 
| RB_DUMP | 0x0100 | Dump kernel memory before rebooting; see savecore(8) for more information. | 
| RB_HALT | 0x0008 | the processor is simply halted; no reboot takes place. This option should be used with caution. | 
| RB_POWERDOWN | 0x0808 | This option is always used in conjunction with RB_HALT, and if the system hardware supports the
      function, the system will be powered off, otherwise it has no effect. | 
| RB_INITNAME | 0x0010 | 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 | 0x0040 | 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() call. See
      ddb(4) for more
      information. | 
| RB_NOSYNC | 0x0004 | 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 | 0x0080 | Initially mount the root file system read-only. This is currently the default, and this option has been deprecated. | 
| RB_SINGLE | 0x0002 | Normally, the reboot procedure involves an automatic disk consistency
      check and then multi-user operations. RB_SINGLEprevents this, booting the system with a single-user shell on the console.RB_SINGLEis actually interpreted by the
      init(8) program in the newly
      booted system.When no options are given (i.e.,
         | 
| RB_STRING | 0x0400 | bootstr is a string passed to the firmware on the machine, if possible, if this option is set. Currently this is only implemented on the sparc and the sun3 ports. | 
| RB_USERCONF | 0x1000 | Initially invoke the userconf(4) facility when the system starts up again, if it has been compiled into the kernel that is loaded. | 
EPERM]reboot() function call appeared in
  4.0BSD.
The RB_DFLTROOT option is now
    obsolete.
| September 4, 2009 | NetBSD 9.3 |