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28 .\" @(#)reboot.2 8.1 (Berkeley) 6/4/93
36 .Nd reboot system or halt processor
43 .Fn reboot "int howto"
49 Only the super-user may reboot a machine on demand.
50 However, a reboot is invoked
51 automatically in the event of unrecoverable system failures.
56 is a mask of options; the system call interface allows the following
57 options, defined in the include file
60 to the new kernel or the new bootstrap and init programs.
61 .Bl -tag -width RB_INITNAMEA
63 The default, causing the system to reboot in its usual fashion.
65 Interpreted by the bootstrap program itself, causing it to
66 prompt on the console as to what file should be booted.
67 Normally, the system is booted from the file
68 .Dq Ar xx Ns No (0,0)kernel ,
71 is the default disk name,
72 without prompting for the file name.
74 Use the compiled in root device.
75 Normally, the system uses the device from which it was booted
76 as the root device if possible.
77 (The default behavior is dependent on the ability of the bootstrap program
78 to determine the drive from which it was loaded, which is not possible
81 Dump kernel memory before rebooting; see
85 the processor is simply halted; no reboot takes place.
86 This option should be used with caution.
88 After halting, the shutdown code will do what it can to turn
90 This requires hardware support.
92 An option allowing the specification of an init program (see
96 to be run when the system reboots.
97 This switch is not currently available.
99 Load the symbol table and enable a built-in debugger in the system.
100 This option will have no useful function if the kernel is not configured
102 Several other options have different meaning if combined
103 with this option, although their use may not be possible
109 for more information.
111 Normally, the disks are sync'd (see
113 before the processor is halted or rebooted.
114 This option may be useful if file system changes have been made manually
115 or if the processor is on fire.
117 Initially mount the root file system read-only.
118 This is currently the default, and this option has been deprecated.
120 Normally, the reboot procedure involves an automatic disk consistency
121 check and then multi-user operations.
123 prevents this, booting the system with a single-user shell
126 is actually interpreted by the
128 program in the newly booted system.
131 When no options are given (i.e.,
133 is used), the system is
136 in the root file system of unit 0
137 of a disk chosen in a processor specific way.
138 An automatic consistency check of the disks is normally performed
142 If successful, this call never returns.
143 Otherwise, a -1 is returned and an error is returned in the global
149 The caller is not the super-user.
160 system call appeared in
163 The HP300 implementation supports neither