projects / unix-history / blame
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|---|---|---|
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1 | .\" Copyright (c) 1980 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| ab9465ad | 5 | .\" @(#)reboot.2 6.1 (Berkeley) %G% |
| 7b826f9e | 6 | .\" |
| ab9465ad | 7 | .TH REBOOT 2 "" |
| 7b826f9e KM |
8 | .UC 4 |
| 9 | .SH NAME | |
| 10 | reboot \- reboot system or halt processor | |
| 11 | .SH SYNOPSIS | |
| 12 | .nf | |
| 13 | .B #include <sys/reboot.h> | |
| 14 | .PP | |
| 15 | .B reboot(howto) | |
| 16 | .B int howto; | |
| 17 | .fi | |
| 18 | .SH DESCRIPTION | |
| 19 | .I Reboot | |
| 72252431 | 20 | reboots the system, and is invoked automatically |
| 7b826f9e KM |
21 | in the event of unrecoverable system failures. |
| 22 | .I Howto | |
| 23 | is a mask of options passed to the bootstrap program. | |
| 24 | The system call interface permits only RB_HALT or RB_AUTOBOOT | |
| 25 | to be passed to the reboot program; the other flags | |
| 26 | are used in scripts stored on the console storage media, or used | |
| 27 | in manual bootstrap procedures. | |
| 28 | When none of these options (e.g. RB_AUTOBOOT) is given, the system is rebooted | |
| 29 | from file \*(lqvmunix\*(rq in the root file system of unit 0 | |
| 72252431 | 30 | of a disk chosen in a processor specific way. |
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31 | An automatic consistency check of the disks is then normally performed. |
| 32 | .PP | |
| 33 | The bits of | |
| 34 | .I howto | |
| 35 | are: | |
| 36 | .TP | |
| 37 | RB_HALT | |
| 38 | the processor is simply halted; no reboot takes place. | |
| 72252431 | 39 | RB_HALT should be used with caution. |
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40 | .TP |
| 41 | RB_ASKNAME | |
| 42 | Interpreted by the bootstrap program itself, causing it to | |
| 43 | inquire as to what file should be booted. Normally, the system is | |
| 72252431 | 44 | booted from the file \*(lqxx(0,0)vmunix\*(rq without asking. |
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45 | .TP |
| 46 | RB_SINGLE | |
| 47 | Normally, the reboot procedure involves an automatic disk consistency | |
| 72252431 | 48 | check and then multi-user operations. RB_SINGLE prevents the consistency |
| 7b826f9e | 49 | check, rather simply booting the system with a single-user shell on |
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50 | the console. |
| 51 | RB_SINGLE is interpreted by the | |
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52 | .IR init (8) |
| 53 | program in the newly booted system. | |
| 54 | This switch is not available from the system call interface. | |
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55 | .PP |
| 56 | Only the super-user may | |
| 57 | .I reboot | |
| 58 | a machine. | |
| 59 | .SH "RETURN VALUES" | |
| 60 | If successful, this call never returns. Otherwise, a \-1 | |
| 61 | is returned and an error is returned in the global variable | |
| 62 | .IR errno . | |
| 63 | .SH ERRORS | |
| 64 | .TP 15 | |
| 65 | [EPERM] | |
| 66 | The caller is not the super-user. | |
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67 | .SH "SEE ALSO" |
| 68 | crash(8), halt(8), init(8), reboot(8) | |
| 69 | .SH BUGS | |
| 72252431 KM |
70 | The notion of ``console medium'', among other things, |
| 71 | is specific to the VAX. |