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