120 lines
6.4 KiB
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120 lines
6.4 KiB
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>25.4.2. Other Environment Inquiries</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Other Environment Inquiries">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html4468 HREF="node234.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4466 HREF="node231.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4462 HREF="node232.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4470 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4471 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4469 HREF="node234.html"> Identity Function</A>
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<B>Up:</B> <A NAME=tex2html4467 HREF="node231.html"> Environment Inquiries</A>
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<B> Previous:</B> <A NAME=tex2html4463 HREF="node232.html"> Time Functions</A>
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<HR> <P>
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<H2><A NAME=SECTION002942000000000000000>25.4.2. Other Environment Inquiries</A></H2>
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<P>
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For any of the following functions, if no appropriate
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and relevant result can be produced, <tt>nil</tt> is returned instead
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of a string.
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<P>
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<hr>
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<b>Rationale:</b> These inquiry facilities are functions rather than variables
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against the possibility that a Common Lisp process might migrate from
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machine to machine. This need not happen in a distributed
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environment; consider, for example, dumping a core image file
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containing a compiler and then shipping it to another site.
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<hr>
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<P>
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<BR><b>[Function]</b><BR>
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<tt>lisp-implementation-type</tt><P>A string is returned that identifies the generic name of
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the particular Common Lisp implementation.
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Examples: <tt>"Spice LISP"</tt>, <tt>"Zetalisp"</tt>.
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<P>
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<BR><b>[Function]</b><BR>
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<tt>lisp-implementation-version</tt><P>A string is returned that identifies the version of
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the particular Common Lisp implementation; this information
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should be of use to maintainers of the implementation.
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Examples: <tt>"1192"</tt>, <tt>"53.7 with complex numbers"</tt>,
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<tt>"1746.9A, NEWIO 53, ETHER 5.3"</tt>.
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<P>
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<BR><b>[Function]</b><BR>
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<tt>machine-type</tt><P>A string is returned that identifies the generic name of
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the computer hardware on which Common Lisp is running.
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Examples: <tt>"IMLAC"</tt>, <tt>"DEC PDP-10"</tt>, <tt>"DEC VAX-11/780"</tt>.
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<P>
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<BR><b>[Function]</b><BR>
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<tt>machine-version</tt><P>A string is returned that identifies the version of
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the computer hardware on which Common Lisp is running.
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Example: <tt>"KL10, microcode 9"</tt>.
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<P>
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<BR><b>[Function]</b><BR>
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<tt>machine-instance</tt><P>A string is returned that identifies the particular
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instance of the computer hardware on which Common Lisp is running;
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this might be a local nickname, for example, or a serial number.
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Examples: <tt>"MIT-MC"</tt>, <tt>"CMU GP-VAX"</tt>.
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<P>
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<BR><b>[Function]</b><BR>
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<tt>software-type</tt><P>A string is returned that identifies the generic name of
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any relevant supporting software.
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Examples: <tt>"Spice"</tt>, <tt>"TOPS-20"</tt>, <tt>"ITS"</tt>.
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<P>
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<BR><b>[Function]</b><BR>
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<tt>software-version</tt><P>A string is returned that identifies the version of
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any relevant supporting software; this information
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should be of use to maintainers of the implementation.
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<P>
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<BR><b>[Function]</b><BR>
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<tt>short-site-name <BR></tt><tt>long-site-name</tt><P>A string is returned that identifies the physical location
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of the computer hardware.
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Examples of short names: <tt>"MIT AI Lab"</tt>, <tt>"CMU-CSD"</tt>.
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Examples of long names:
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<P><pre>
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"MIT Artificial Intelligence Laboratory"
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"Massachusetts Institute of Technology
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Artificial Intelligence Laboratory"
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"Carnegie-Mellon University Computer Science Department"
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</pre><P>
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<P>
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See also <tt>user-homedir-pathname</tt>.
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<P>
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<BR><b>[Variable]</b><BR>
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<tt>*features*</tt><P>The value of the variable <tt>*features*</tt> should be a list of symbols
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that name ``features'' provided by the implementation.
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Most such names will be implementation-specific; typically
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a name for the implementation will be included.
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<P>
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<img align=bottom alt="old_change_begin" src="gif/old_change_begin.gif"><br>
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One standard feature name is <tt>ieee-floating-point</tt>, which should
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be present if and only if full IEEE proposed floating-point
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arithmetic [<A HREF="node368.html#IEEEPROPOSEDFLOATINGPOINTSTANDARD">23</A>] is supported.
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<br><img align=bottom alt="old_change_end" src="gif/old_change_end.gif">
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<P>
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The value of this variable is used by the <tt>#+</tt> and <tt>#-</tt>
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reader syntax.
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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X3J13 voted in March 1988 (SHARPSIGN-PLUS-MINUS-PACKAGE) <A NAME=29268> </A>
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to specify that feature names used with <tt>#+</tt> and <tt>#-</tt>
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are read in the <tt>keyword</tt> package unless an explicit prefix
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designating some other package appears. The standard
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feature name <tt>ieee-floating-point</tt> is therefore actually the
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keyword <tt>:ieee-floating-point</tt>, though one need not write the colon
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when using it with <tt>#+</tt> or <tt>#-</tt>; thus <tt>#+ieee-floating-point</tt>
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and <tt>#+:ieee-floating-point</tt> mean the same thing.
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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<BR> <HR><A NAME=tex2html4468 HREF="node234.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4466 HREF="node231.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4462 HREF="node232.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4470 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4471 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4469 HREF="node234.html"> Identity Function</A>
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<B>Up:</B> <A NAME=tex2html4467 HREF="node231.html"> Environment Inquiries</A>
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<B> Previous:</B> <A NAME=tex2html4463 HREF="node232.html"> Time Functions</A>
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<HR> <P>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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