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32 .\" @(#)reboot.2 8.1 (Berkeley) 6/4/93
40 .Nd reboot system or halt processor
47 .Fn reboot "int howto"
53 Only the super-user may reboot a machine on demand.
54 However, a reboot is invoked
55 automatically in the event of unrecoverable system failures.
60 is a mask of options; the system call interface allows the following
61 options, defined in the include file
64 to the new kernel or the new bootstrap and init programs.
65 .Bl -tag -width RB_INITNAMEA
67 The default, causing the system to reboot in its usual fashion.
69 Interpreted by the bootstrap program itself, causing it to
70 prompt on the console as to what file should be booted.
71 Normally, the system is booted from the file
72 .Dq Ar xx Ns No (0,0)kernel ,
75 is the default disk name,
76 without prompting for the file name.
78 Use the compiled in root device.
79 Normally, the system uses the device from which it was booted
80 as the root device if possible.
81 (The default behavior is dependent on the ability of the bootstrap program
82 to determine the drive from which it was loaded, which is not possible
85 Dump kernel memory before rebooting; see
89 the processor is simply halted; no reboot takes place.
90 This option should be used with caution.
92 After halting, the shutdown code will do what it can to turn
94 This requires hardware support.
96 An option allowing the specification of an init program (see
100 to be run when the system reboots.
101 This switch is not currently available.
103 Load the symbol table and enable a built-in debugger in the system.
104 This option will have no useful function if the kernel is not configured
106 Several other options have different meaning if combined
107 with this option, although their use may not be possible
113 for more information.
115 Normally, the disks are sync'd (see
117 before the processor is halted or rebooted.
118 This option may be useful if file system changes have been made manually
119 or if the processor is on fire.
121 Initially mount the root file system read-only.
122 This is currently the default, and this option has been deprecated.
124 Normally, the reboot procedure involves an automatic disk consistency
125 check and then multi-user operations.
127 prevents this, booting the system with a single-user shell
130 is actually interpreted by the
132 program in the newly booted system.
135 When no options are given (i.e.,
137 is used), the system is
140 in the root file system of unit 0
141 of a disk chosen in a processor specific way.
142 An automatic consistency check of the disks is normally performed
146 If successful, this call never returns.
147 Otherwise, a -1 is returned and an error is returned in the global
153 The caller is not the super-user.
164 system call appeared in
167 The HP300 implementation supports neither