163 lines
5.1 KiB
Perl
163 lines
5.1 KiB
Perl
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.\" Copyright (c) 1983, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)a.t 8.1 (Berkeley) 6/8/93
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.\"
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.\".ds RH "Configuration File Grammar
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.bp
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.LG
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.B
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.ce
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APPENDIX A. CONFIGURATION FILE GRAMMAR
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.sp
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.R
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.NL
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.PP
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The following grammar is a compressed form of the actual
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\fIyacc\fP\|(1) grammar used by
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.I config
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to parse configuration files.
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Terminal symbols are shown all in upper case, literals
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are emboldened; optional clauses are enclosed in brackets, ``[''
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and ``]''; zero or more instantiations are denoted with ``*''.
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.sp
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.nf
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.DT
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Configuration ::= [ Spec \fB;\fP ]*
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Spec ::= Config_spec
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| Device_spec
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| \fBtrace\fP
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| /* lambda */
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/* configuration specifications */
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Config_spec ::= \fBmachine\fP ID
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| \fBcpu\fP ID
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| \fBoptions\fP Opt_list
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| \fBident\fP ID
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| System_spec
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| \fBtimezone\fP [ \fB\-\fP ] NUMBER [ \fBdst\fP [ NUMBER ] ]
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| \fBtimezone\fP [ \fB\-\fP ] FPNUMBER [ \fBdst\fP [ NUMBER ] ]
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| \fBmaxusers\fP NUMBER
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/* system configuration specifications */
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System_spec ::= \fBconfig\fP ID System_parameter [ System_parameter ]*
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System_parameter ::= swap_spec | root_spec | dump_spec | arg_spec
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swap_spec ::= \fBswap\fP [ \fBon\fP ] swap_dev [ \fBand\fP swap_dev ]*
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swap_dev ::= dev_spec [ \fBsize\fP NUMBER ]
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root_spec ::= \fBroot\fP [ \fBon\fP ] dev_spec
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dump_spec ::= \fBdumps\fP [ \fBon\fP ] dev_spec
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arg_spec ::= \fBargs\fP [ \fBon\fP ] dev_spec
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dev_spec ::= dev_name | major_minor
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major_minor ::= \fBmajor\fP NUMBER \fBminor\fP NUMBER
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dev_name ::= ID [ NUMBER [ ID ] ]
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/* option specifications */
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Opt_list ::= Option [ \fB,\fP Option ]*
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Option ::= ID [ \fB=\fP Opt_value ]
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Opt_value ::= ID | NUMBER
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Mkopt_list ::= Mkoption [ \fB,\fP Mkoption ]*
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Mkoption ::= ID \fB=\fP Opt_value
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/* device specifications */
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Device_spec ::= \fBdevice\fP Dev_name Dev_info Int_spec
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| \fBmaster\fP Dev_name Dev_info
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| \fBdisk\fP Dev_name Dev_info
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| \fBtape\fP Dev_name Dev_info
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| \fBcontroller\fP Dev_name Dev_info [ Int_spec ]
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| \fBpseudo-device\fP Dev [ NUMBER ]
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Dev_name ::= Dev NUMBER
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Dev ::= \fBuba\fP | \fBmba\fP | ID
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Dev_info ::= Con_info [ Info ]*
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Con_info ::= \fBat\fP Dev NUMBER
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| \fBat\fP \fBnexus\fP NUMBER
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Info ::= \fBcsr\fP NUMBER
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| \fBdrive\fP NUMBER
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| \fBslave\fP NUMBER
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| \fBflags\fP NUMBER
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Int_spec ::= \fBvector\fP ID [ ID ]*
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| \fBpriority\fP NUMBER
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.fi
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.sp
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.SH
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Lexical Conventions
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.LP
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The terminal symbols are loosely defined as:
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.IP ID
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.br
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One or more alphabetics, either upper or lower case, and underscore,
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``_''.
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.IP NUMBER
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.br
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Approximately the C language specification for an integer number.
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That is, a leading ``0x'' indicates a hexadecimal value,
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a leading ``0'' indicates an octal value, otherwise the number is
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expected to be a decimal value. Hexadecimal numbers may use either
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upper or lower case alphabetics.
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.IP FPNUMBER
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.br
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A floating point number without exponent. That is a number of the
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form ``nnn.ddd'', where the fractional component is optional.
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.LP
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In special instances a question mark, ``?'', can be substituted for
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a ``NUMBER'' token. This is used to effect wildcarding in device
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interconnection specifications.
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.LP
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Comments in configuration files are indicated by a ``#'' character
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at the beginning of the line; the remainder of the line is discarded.
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.LP
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A specification
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is interpreted as a continuation of the previous line
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if the first character of the line is tab.
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