1REBOOT(2) 386BSD Programmer's Manual REBOOT(2) 2 3NNAAMMEE 4 rreebboooott - reboot system or halt processor 5 6SSYYNNOOPPSSIISS 7 ##iinncclluuddee <<uunniissttdd..hh>> 8 ##iinncclluuddee <<ssyyss//rreebboooott..hh>> 9 10 _i_n_t 11 rreebboooott(_i_n_t _h_o_w_t_o) 12 13DDEESSCCRRIIPPTTIIOONN 14 RReebboooott() reboots the system. Only the super-user may reboot a machine on 15 demand. However, a reboot is invoked automatically in the event of 16 unrecoverable system failures. 17 18 _H_o_w_t_o is a mask of options; the system call interface allows the 19 following options, defined in the include file <_s_y_s/_r_e_b_o_o_t._h>, to be 20 passed to the new kernel or the new bootstrap and init programs. 21 22 RB_AUTOBOOT The default, causing the system to reboot in its usual 23 fashion. 24 25 RB_ASKNAME Interpreted by the bootstrap program itself, causing it to 26 prompt on the console as to what file should be booted. 27 Normally, the system is booted from the file 28 ``_x_x(0,0)vmunix'', where _x_x is the default disk name, 29 without prompting for the file name. 30 31 RB_DFLTROOT Use the compiled in root device. Normally, the system uses 32 the device from which it was booted as the root device if 33 possible. (The default behavior is dependent on the 34 ability of the bootstrap program to determine the drive 35 from which it was loaded, which is not possible on all 36 systems.) 37 38 RB_DUMP Dump kernel memory before rebooting; see savecore(8) for 39 more information. 40 41 RB_HALT the processor is simply halted; no reboot takes place. 42 This option should be used with caution. 43 44 RB_INITNAME An option allowing the specification of an init program 45 (see init(8)) other than /_s_b_i_n/_i_n_i_t to be run when the 46 system reboots. This switch is not currently available. 47 48 RB_KDB Load the symbol table and enable a built-in debugger in the 49 system. This option will have no useful function if the 50 kernel is not configured for debugging. Several other 51 options have different meaning if combined with this 52 option, although their use may not be possible via the 53 rreebboooott() call. See kadb(4) for more information. 54 55 RB_NOSYNC Normally, the disks are sync'd (see sync(8)) before the 56 processor is halted or rebooted. This option may be useful 57 if file system changes have been made manually or if the 58 processor is on fire. 59 60 RB_RDONLY Initially mount the root file system read-only. This is 61 currently the default, and this option has been deprecated. 62 63 RB_SINGLE Normally, the reboot procedure involves an automatic disk 64 consistency check and then multi-user operations. 65 RB_SINGLE prevents this, booting the system with a single- 66 user shell on the console. RB_SINGLE is actually 67 interpreted by the init(8) program in the newly booted 68 system. 69 70 When no options are given (i.e., RB_AUTOBOOT is used), the 71 system is rebooted from file ``vmunix'' in the root file 72 system of unit 0 of a disk chosen in a processor specific 73 way. An automatic consistency check of the disks is 74 normally performed (see fsck(8)). 75 76RREETTUURRNN VVAALLUUEESS 77 If successful, this call never returns. Otherwise, a -1 is returned and 78 an error is returned in the global variable _e_r_r_n_o. 79 80EERRRROORRSS 81 [EPERM] The caller is not the super-user. 82 83SSEEEE AALLSSOO 84 kadb(4), crash(8), halt(8), init(8), reboot(8), savecore(8) 85 86BBUUGGSS 87 The HP300 implementation supports neither RB_DFLTROOT nor RB_KDB. 88 89HHIISSTTOORRYY 90 The rreebboooott function call appeared in 4.0BSD. 91 924th Berkeley Distribution March 10, 1991 2 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133