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authorThomas Bushnell, BSG <tb@debian.org>2005-11-02 14:55:21 -0800
committerBryan Newbold <bnewbold@robocracy.org>2017-02-20 00:05:32 -0800
commit34c54a22ff7818bb8b38ef4d9c87dbbcb221ba73 (patch)
tree1189d06a81277bcf8539b0260a69a19f6038effb /slib_2.html
parent611b3db17894e5fdc0db3d49eaf6743d27b44233 (diff)
parent5145dd3aa0c02c9fc496d1432fc4410674206e1d (diff)
downloadslib-34c54a22ff7818bb8b38ef4d9c87dbbcb221ba73.tar.gz
slib-34c54a22ff7818bb8b38ef4d9c87dbbcb221ba73.zip
Import Debian changes 3a2-1debian/3a2-1
slib (3a2-1) unstable; urgency=low * New upstream release. * Acknowledge NMU. (Closes: #281809) * Makefile: Don't hack Makefile; use rules instead. * debian/rules: Set on make invocations: prefix, htmldir, TEXI2HTML. * debian/rules (clean): Clean more stuff here. * Makefile: Comment out old rule for $(htmldir)slib_toc.html. Instead, specify directly that the texi2html invocation produces that file. * debian/rules (binary-indep): Find web files in slib subdir. * debian/control (Build-Depends-Indep): Go back to using scm.
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-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
- "http://www.w3.org/TR/html40/loose.dtd">
-<HTML>
-<!-- Created on January, 10 2005 by texi2html 1.66 -->
-<!--
-Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
- Karl Berry <karl@freefriends.org>
- Olaf Bachmann <obachman@mathematik.uni-kl.de>
- and many others.
-Maintained by: Many creative people <dev@texi2html.cvshome.org>
-Send bugs and suggestions to <users@texi2html.cvshome.org>
-
--->
-<HEAD>
-<TITLE>SLIB: Universal SLIB Procedures</TITLE>
-
-<META NAME="description" CONTENT="SLIB: Universal SLIB Procedures">
-<META NAME="keywords" CONTENT="SLIB: Universal SLIB Procedures">
-<META NAME="resource-type" CONTENT="document">
-<META NAME="distribution" CONTENT="global">
-<META NAME="Generator" CONTENT="texi2html 1.66">
-
-</HEAD>
-
-<BODY LANG="en" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000">
-
-<A NAME="SEC13"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_1.html#SEC12"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC14"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_1.html#SEC1"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H1> 2. Universal SLIB Procedures </H1>
-<!--docid::SEC13::-->
-<P>
-
-The procedures described in these sections are supported by all
-implementations as part of the `<SAMP>*.init</SAMP>' files or by
-`<TT>require.scm</TT>'.
-</P>
-<P>
-
-<TABLE BORDER="0" CELLSPACING="0">
-<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="slib_2.html#SEC14">2.1 Vicinity</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">Pathname Management</TD></TR>
-<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="slib_2.html#SEC15">2.2 Configuration</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">Characteristics of Scheme Implementation</TD></TR>
-<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="slib_2.html#SEC16">2.3 Input/Output</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">Things not provided by the Scheme specs.</TD></TR>
-<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="slib_2.html#SEC17">2.4 System</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP">LOADing, EVALing, ERRORing, and EXITing</TD></TR>
-<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="slib_2.html#SEC18">2.5 Miscellany</A></TD><TD>&nbsp;&nbsp;</TD><TD ALIGN="left" VALIGN="TOP"></TD></TR>
-</TABLE>
-<P>
-
-<A NAME="Vicinity"></A>
-<HR SIZE="6">
-<A NAME="SEC14"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC15"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H2> 2.1 Vicinity </H2>
-<!--docid::SEC14::-->
-<P>
-
-A vicinity is a descriptor for a place in the file system. Vicinities
-hide from the programmer the concepts of host, volume, directory, and
-version. Vicinities express only the concept of a file environment
-where a file name can be resolved to a file in a system independent
-manner. Vicinities can even be used on <EM>flat</EM> file systems (which
-have no directory structure) by having the vicinity express constraints
-on the file name. On most systems a vicinity would be a string. All of
-these procedures are file system dependent.
-</P>
-<P>
-
-These procedures are provided by all implementations.
-</P>
-<P>
-
-<A NAME="IDX56"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>make-vicinity</B> <I>dirpath</I>
-<DD>Returns <VAR>dirpath</VAR> as a vicinity for use as first argument to
-<CODE>in-vicinity</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX57"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>pathname-&gt;vicinity</B> <I>path</I>
-<DD>Returns the vicinity containing <VAR>path</VAR>.
-<TABLE><tr><td>&nbsp;</td><td class=example><pre>(pathname-&gt;vicinity &quot;/usr/local/lib/scm/Link.scm&quot;)
- => &quot;/usr/local/lib/scm/&quot;
-</pre></td></tr></table></DL>
-<P>
-
-<A NAME="IDX58"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>program-vicinity</B>
-<DD>Returns the vicinity of the currently loading Scheme code. For an
-interpreter this would be the directory containing source code. For a
-compiled system (with multiple files) this would be the directory where
-the object or executable files are. If no file is currently loading it
-the result is undefined. <STRONG>Warning:</STRONG> <CODE>program-vicinity</CODE> can
-return incorrect values if your program escapes back into a
-<CODE>load</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX59"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>library-vicinity</B>
-<DD>Returns the vicinity of the shared Scheme library.
-</DL>
-<P>
-
-<A NAME="IDX60"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>implementation-vicinity</B>
-<DD>Returns the vicinity of the underlying Scheme implementation. This
-vicinity will likely contain startup code and messages and a compiler.
-</DL>
-<P>
-
-<A NAME="IDX61"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>user-vicinity</B>
-<DD>Returns the vicinity of the current directory of the user. On most
-systems this is `<TT>&quot;&quot;</TT>' (the empty string).
-</DL>
-<P>
-
-<A NAME="IDX62"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>home-vicinity</B>
-<DD>Returns the vicinity of the user's <EM>HOME</EM> directory, the directory
-<A NAME="IDX63"></A>
-which typically contains files which customize a computer environment
-for a user. If scheme is running without a user (eg. a daemon) or if
-this concept is meaningless for the platform, then <CODE>home-vicinity</CODE>
-returns <CODE>#f</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX64"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>vicinity:suffix?</B> <I>chr</I>
-<DD>Returns the `<SAMP>#t</SAMP>' if <VAR>chr</VAR> is a vicinity suffix character; and
-<CODE>#f</CODE> otherwise. Typical vicinity suffixes are `<SAMP>/</SAMP>',
-`<SAMP>:</SAMP>', and `<SAMP>\</SAMP>',
-</DL>
-<P>
-
-<A NAME="IDX65"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>in-vicinity</B> <I>vicinity filename</I>
-<DD>Returns a filename suitable for use by <CODE>slib:load</CODE>,
-<CODE>slib:load-source</CODE>, <CODE>slib:load-compiled</CODE>,
-<CODE>open-input-file</CODE>, <CODE>open-output-file</CODE>, etc. The returned
-filename is <VAR>filename</VAR> in <VAR>vicinity</VAR>. <CODE>in-vicinity</CODE> should
-allow <VAR>filename</VAR> to override <VAR>vicinity</VAR> when <VAR>filename</VAR> is
-an absolute pathname and <VAR>vicinity</VAR> is equal to the value of
-<CODE>(user-vicinity)</CODE>. The behavior of <CODE>in-vicinity</CODE> when
-<VAR>filename</VAR> is absolute and <VAR>vicinity</VAR> is not equal to the value
-of <CODE>(user-vicinity)</CODE> is unspecified. For most systems
-<CODE>in-vicinity</CODE> can be <CODE>string-append</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX66"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>sub-vicinity</B> <I>vicinity name</I>
-<DD>Returns the vicinity of <VAR>vicinity</VAR> restricted to <VAR>name</VAR>. This
-is used for large systems where names of files in subsystems could
-conflict. On systems with directory structure <CODE>sub-vicinity</CODE> will
-return a pathname of the subdirectory <VAR>name</VAR> of
-<VAR>vicinity</VAR>.
-</DL>
-<P>
-
-<A NAME="Configuration"></A>
-<HR SIZE="6">
-<A NAME="SEC15"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC14"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC16"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H2> 2.2 Configuration </H2>
-<!--docid::SEC15::-->
-<P>
-
-These constants and procedures describe characteristics of the Scheme
-and underlying operating system. They are provided by all
-implementations.
-</P>
-<P>
-
-<A NAME="IDX67"></A>
-</P>
-<DL>
-<DT><U>Constant:</U> <B>char-code-limit</B>
-<DD>An integer 1 larger that the largest value which can be returned by
-<CODE>char-&gt;integer</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX68"></A>
-</P>
-<DL>
-<DT><U>Constant:</U> <B>most-positive-fixnum</B>
-<DD>In implementations which support integers of practically unlimited size,
-<VAR>most-positive-fixnum</VAR> is a large exact integer within the range of
-exact integers that may result from computing the length of a list,
-vector, or string.
-<P>
-
-In implementations which do not support integers of practically
-unlimited size, <VAR>most-positive-fixnum</VAR> is the largest exact integer
-that may result from computing the length of a list, vector, or string.
-</P>
-</DL>
-<P>
-
-<A NAME="IDX69"></A>
-</P>
-<DL>
-<DT><U>Constant:</U> <B>slib:tab</B>
-<DD>The tab character.
-</DL>
-<P>
-
-<A NAME="IDX70"></A>
-</P>
-<DL>
-<DT><U>Constant:</U> <B>slib:form-feed</B>
-<DD>The form-feed character.
-</DL>
-<P>
-
-<A NAME="IDX71"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>software-type</B>
-<DD>Returns a symbol denoting the generic operating system type. For
-instance, <CODE>unix</CODE>, <CODE>vms</CODE>, <CODE>macos</CODE>, <CODE>amiga</CODE>, or
-<CODE>ms-dos</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX72"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>slib:report-version</B>
-<DD>Displays the versions of SLIB and the underlying Scheme implementation
-and the name of the operating system. An unspecified value is returned.
-<P>
-
-<TABLE><tr><td>&nbsp;</td><td class=example><pre>(slib:report-version) => slib &quot;3a1&quot; on scm &quot;5b1&quot; on unix
-</pre></td></tr></table></DL>
-<P>
-
-<A NAME="IDX73"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>slib:report</B>
-<DD>Displays the information of <CODE>(slib:report-version)</CODE> followed by
-almost all the information neccessary for submitting a problem report.
-An unspecified value is returned.
-<P>
-
-<A NAME="IDX74"></A>
-<DT><U>Function:</U> <B>slib:report</B> <I>#t</I>
-<DD>provides a more verbose listing.
-</P>
-<P>
-
-<A NAME="IDX75"></A>
-<DT><U>Function:</U> <B>slib:report</B> <I>filename</I>
-<DD>Writes the report to file `<TT>filename</TT>'.
-</P>
-<P>
-
-<TABLE><tr><td>&nbsp;</td><td class=example><pre>(slib:report)
-=>
-slib &quot;3a1&quot; on scm &quot;5b1&quot; on unix
-(implementation-vicinity) is &quot;/usr/local/lib/scm/&quot;
-(library-vicinity) is &quot;/usr/local/lib/slib/&quot;
-(scheme-file-suffix) is &quot;.scm&quot;
-loaded *features* :
- trace alist qp sort
- common-list-functions macro values getopt
- compiled
-implementation *features* :
- bignum complex real rational
- inexact vicinity ed getenv
- tmpnam abort transcript with-file
- ieee-p1178 r4rs rev4-optional-procedures hash
- object-hash delay eval dynamic-wind
- multiarg-apply multiarg/and- logical defmacro
- string-port source current-time record
- rev3-procedures rev2-procedures sun-dl string-case
- array dump char-ready? full-continuation
- system
-implementation *catalog* :
- (i/o-extensions compiled &quot;/usr/local/lib/scm/ioext.so&quot;)
- ...
-</pre></td></tr></table></DL>
-<P>
-
-<A NAME="Input/Output"></A>
-<HR SIZE="6">
-<A NAME="SEC16"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC15"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC17"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H2> 2.3 Input/Output </H2>
-<!--docid::SEC16::-->
-<P>
-
-These procedures are provided by all implementations.
-</P>
-<P>
-
-<A NAME="IDX76"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>file-exists?</B> <I>filename</I>
-<DD>Returns <CODE>#t</CODE> if the specified file exists. Otherwise, returns
-<CODE>#f</CODE>. If the underlying implementation does not support this
-feature then <CODE>#f</CODE> is always returned.
-</DL>
-<P>
-
-<A NAME="IDX77"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>delete-file</B> <I>filename</I>
-<DD>Deletes the file specified by <VAR>filename</VAR>. If <VAR>filename</VAR> can not
-be deleted, <CODE>#f</CODE> is returned. Otherwise, <CODE>#t</CODE> is
-returned.
-</DL>
-<P>
-
-<A NAME="IDX78"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>open-file</B> <I>filename modes</I>
-<DD><VAR>filename</VAR> should be a string naming a file. <CODE>open-file</CODE>
-returns a port depending on the symbol <VAR>modes</VAR>:
-<P>
-
-</P>
-<DL COMPACT>
-<DT>r
-<DD>an input port capable of delivering characters from the file.
-<DT>rb
-<DD>a <EM>binary</EM> input port capable of delivering characters from the file.
-<DT>w
-<DD>an output port capable of writing characters to a new file by that name.
-<DT>wb
-<DD>a <EM>binary</EM> output port capable of writing characters to a new file
-by that name.
-</DL>
-<P>
-
-If an implementation does not distinguish between binary and non-binary
-files, then it must treat rb as r and wb as w.
-</P>
-<P>
-
-If the file cannot be opened, either #f is returned or an error is
-signalled. For output, if a file with the given name already exists,
-the effect is unspecified.
-</P>
-</DL>
-<P>
-
-<A NAME="IDX79"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>port?</B> <I>obj</I>
-<DD>Returns <TT>#t</TT> if <VAR>obj</VAR> is an input or output port, otherwise
-returns <TT>#f</TT>.
-</DL>
-<P>
-
-<A NAME="IDX80"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>close-port</B> <I>port</I>
-<DD>Closes the file associated with <VAR>port</VAR>, rendering the <VAR>port</VAR>
-incapable of delivering or accepting characters.
-<P>
-
-<CODE>close-file</CODE> has no effect if the file has already been closed.
-The value returned is unspecified.
-</P>
-</DL>
-<P>
-
-<A NAME="IDX81"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>call-with-open-ports</B> <I>proc ports <small>...</small></I>
-<DD><A NAME="IDX82"></A>
-<DT><U>Function:</U> <B>call-with-open-ports</B> <I>ports <small>...</small> proc</I>
-<DD><VAR>Proc</VAR> should be a procedure that accepts as many arguments as there
-are <VAR>ports</VAR> passed to <CODE>call-with-open-ports</CODE>.
-<CODE>call-with-open-ports</CODE> calls <VAR>proc</VAR> with <VAR>ports</VAR> <small>...</small>.
-If <VAR>proc</VAR> returns, then the ports are closed automatically and the
-value yielded by the <VAR>proc</VAR> is returned. If <VAR>proc</VAR> does not
-return, then the ports will not be closed automatically unless it is
-possible to prove that the ports will never again be used for a read or
-write operation.
-</DL>
-<P>
-
-<A NAME="IDX83"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>tmpnam</B>
-<DD>Returns a pathname for a file which will likely not be used by any other
-process. Successive calls to <CODE>(tmpnam)</CODE> will return different
-pathnames.
-</DL>
-<P>
-
-<A NAME="IDX84"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>current-error-port</B>
-<DD>Returns the current port to which diagnostic and error output is
-directed.
-</DL>
-<P>
-
-<A NAME="IDX85"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>force-output</B>
-<DD><A NAME="IDX86"></A>
-<DT><U>Procedure:</U> <B>force-output</B> <I>port</I>
-<DD>Forces any pending output on <VAR>port</VAR> to be delivered to the output
-device and returns an unspecified value. The <VAR>port</VAR> argument may be
-omitted, in which case it defaults to the value returned by
-<CODE>(current-output-port)</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX87"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>output-port-width</B>
-<DD><A NAME="IDX88"></A>
-<DT><U>Function:</U> <B>output-port-width</B> <I>port</I>
-<DD><P>
-
-Returns the width of <VAR>port</VAR>, which defaults to
-<CODE>(current-output-port)</CODE> if absent. If the width cannot be
-determined 79 is returned.
-</P>
-</DL>
-<P>
-
-<A NAME="IDX89"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>output-port-height</B>
-<DD><A NAME="IDX90"></A>
-<DT><U>Function:</U> <B>output-port-height</B> <I>port</I>
-<DD><P>
-
-Returns the height of <VAR>port</VAR>, which defaults to
-<CODE>(current-output-port)</CODE> if absent. If the height cannot be
-determined 24 is returned.
-</P>
-</DL>
-<P>
-
-<A NAME="System"></A>
-<HR SIZE="6">
-<A NAME="SEC17"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC16"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC18"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H2> 2.4 System </H2>
-<!--docid::SEC17::-->
-<P>
-
-These procedures are provided by all implementations.
-</P>
-<P>
-
-<A NAME="IDX91"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:load-source</B> <I>name</I>
-<DD>Loads a file of Scheme source code from <VAR>name</VAR> with the default
-filename extension used in SLIB. For instance if the filename extension
-used in SLIB is `<TT>.scm</TT>' then <CODE>(slib:load-source &quot;foo&quot;)</CODE> will
-load from file `<TT>foo.scm</TT>'.
-</DL>
-<P>
-
-<A NAME="IDX92"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:load-compiled</B> <I>name</I>
-<DD>On implementations which support separtely loadable compiled modules,
-loads a file of compiled code from <VAR>name</VAR> with the implementation's
-filename extension for compiled code appended.
-</DL>
-<P>
-
-<A NAME="IDX93"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:load</B> <I>name</I>
-<DD>Loads a file of Scheme source or compiled code from <VAR>name</VAR> with the
-appropriate suffixes appended. If both source and compiled code are
-present with the appropriate names then the implementation will load
-just one. It is up to the implementation to choose which one will be
-loaded.
-<P>
-
-If an implementation does not support compiled code then
-<CODE>slib:load</CODE> will be identical to <CODE>slib:load-source</CODE>.
-</P>
-</DL>
-<P>
-
-<A NAME="IDX94"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:eval</B> <I>obj</I>
-<DD><CODE>eval</CODE> returns the value of <VAR>obj</VAR> evaluated in the current top
-level environment. <A HREF="slib_7.html#SEC246">7.4.11 Eval</A> provides a more general evaluation
-facility.
-</DL>
-<P>
-
-<A NAME="IDX95"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:eval-load</B> <I>filename eval</I>
-<DD><VAR>filename</VAR> should be a string. If filename names an existing file,
-the Scheme source code expressions and definitions are read from the
-file and <VAR>eval</VAR> called with them sequentially. The
-<CODE>slib:eval-load</CODE> procedure does not affect the values returned by
-<CODE>current-input-port</CODE> and <CODE>current-output-port</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX96"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:warn</B> <I>arg1 arg2 <small>...</small></I>
-<DD>Outputs a warning message containing the arguments.
-</DL>
-<P>
-
-<A NAME="IDX97"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:error</B> <I>arg1 arg2 <small>...</small></I>
-<DD>Outputs an error message containing the arguments, aborts evaluation of
-the current form and responds in a system dependent way to the error.
-Typical responses are to abort the program or to enter a read-eval-print
-loop.
-</DL>
-<P>
-
-<A NAME="IDX98"></A>
-</P>
-<DL>
-<DT><U>Procedure:</U> <B>slib:exit</B> <I>n</I>
-<DD><A NAME="IDX99"></A>
-<DT><U>Procedure:</U> <B>slib:exit</B>
-<DD>Exits from the Scheme session returning status <VAR>n</VAR> to the system.
-If <VAR>n</VAR> is omitted or <CODE>#t</CODE>, a success status is returned to the
-system (if possible). If <VAR>n</VAR> is <CODE>#f</CODE> a failure is returned to
-the system (if possible). If <VAR>n</VAR> is an integer, then <VAR>n</VAR> is
-returned to the system (if possible). If the Scheme session cannot exit
-an unspecified value is returned from <CODE>slib:exit</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX100"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>browse-url</B> <I>url</I>
-<DD>Web browsers have become so ubiquitous that programming languagues
-should support a uniform interface to them.
-<P>
-
-If a `<SAMP>netscape</SAMP>' browser is running, <CODE>browse-url</CODE> causes the
-browser to display the page specified by string <VAR>url</VAR> and returns
-#t.
-</P>
-<P>
-
-If the browser is not running, <CODE>browse-url</CODE> starts a browser
-displaying the argument <VAR>url</VAR>. If the browser starts as a
-background job, <CODE>browse-url</CODE> returns #t immediately; if the
-browser starts as a foreground job, then <CODE>browse-url</CODE> returns #t
-when the browser exits; otherwise it returns #f.
-</P>
-</DL>
-<P>
-
-<A NAME="Miscellany"></A>
-<HR SIZE="6">
-<A NAME="SEC18"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC17"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC19"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H2> 2.5 Miscellany </H2>
-<!--docid::SEC18::-->
-<P>
-
-These procedures are provided by all implementations.
-</P>
-<P>
-
-<A NAME="IDX101"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>identity</B> <I>x</I>
-<DD><VAR>identity</VAR> returns its argument.
-<P>
-
-Example:
-<TABLE><tr><td>&nbsp;</td><td class=example><pre>(identity 3)
- => 3
-(identity '(foo bar))
- => (foo bar)
-(map identity <VAR>lst</VAR>)
- == (copy-list <VAR>lst</VAR>)
-</pre></td></tr></table></DL>
-<P>
-
-<HR SIZE="6">
-<A NAME="SEC19"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC18"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC20"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H3> 2.5.1 Mutual Exclusion </H3>
-<!--docid::SEC19::-->
-<P>
-
-An <EM>exchanger</EM> is a procedure of one argument regulating mutually
-<A NAME="IDX102"></A>
-exclusive access to a resource. When a exchanger is called, its current
-content is returned, while being replaced by its argument in an atomic
-operation.
-</P>
-<P>
-
-<A NAME="IDX103"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>make-exchanger</B> <I>obj</I>
-<DD><P>
-
-Returns a new exchanger with the argument <VAR>obj</VAR> as its initial
-content.
-</P>
-<P>
-
-<TABLE><tr><td>&nbsp;</td><td class=example><pre>(define queue (make-exchanger (list a)))
-</pre></td></tr></table><P>
-
-A queue implemented as an exchanger holding a list can be protected from
-reentrant execution thus:
-</P>
-<P>
-
-<TABLE><tr><td>&nbsp;</td><td class=example><pre>(define (pop queue)
- (let ((lst #f))
- (dynamic-wind
- (lambda () (set! lst (queue #f)))
- (lambda () (and lst (not (null? lst))
- (let ((ret (car lst)))
- (set! lst (cdr lst))
- ret)))
- (lambda () (and lst (queue lst))))))
-
-(pop queue) => a
-
-(pop queue) => #f
-</pre></td></tr></table></DL>
-<P>
-
-<HR SIZE="6">
-<A NAME="SEC20"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC19"> &lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<H3> 2.5.2 Legacy </H3>
-<!--docid::SEC20::-->
-<P>
-
-The following procedures were present in Scheme until R4RS
-(see section `Language changes' in <CITE>Revised(4) Scheme</CITE>).
-They are provided by all SLIB implementations.
-</P>
-<P>
-
-<A NAME="IDX104"></A>
-</P>
-<DL>
-<DT><U>Constant:</U> <B>t</B>
-<DD>Derfined as <CODE>#t</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX105"></A>
-</P>
-<DL>
-<DT><U>Constant:</U> <B>nil</B>
-<DD>Defined as <CODE>#f</CODE>.
-</DL>
-<P>
-
-<A NAME="IDX106"></A>
-</P>
-<DL>
-<DT><U>Function:</U> <B>last-pair</B> <I>l</I>
-<DD>Returns the last pair in the list <VAR>l</VAR>. Example:
-<TABLE><tr><td>&nbsp;</td><td class=example><pre>(last-pair (cons 1 2))
- => (1 . 2)
-(last-pair '(1 2))
- => (2)
- == (cons 2 '())
-</pre></td></tr></table></DL>
-<P>
-
-<A NAME="Scheme Syntax Extension Packages"></A>
-<HR SIZE="6">
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_2.html#SEC13"> &lt;&lt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_3.html#SEC21"> &gt;&gt; </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="slib_abt.html#SEC_About"> ? </A>]</TD>
-</TR></TABLE>
-<BR>
-<FONT SIZE="-1">
-This document was generated
-by <I>Steve Langasek</I> on <I>January, 10 2005</I>
-using <A HREF="http://texi2html.cvshome.org"><I>texi2html</I></A>
-</FONT>
-
-</BODY>
-</HTML>