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<!-- END WAYBACK TOOLBAR INSERT --><h1>Filesystem Functions in <i>var'aq</i></h1><br>
<h3>De'ghomjangwI'mey</h3><p>
<h3>F.1 Introduction</h3><p>
<h4>F.1.1 vfs Described</h4><p>
This page describes a simple filesystem extension to the <i>var'aq</i>
programming language. It is a fairly simple scheme that gives little or no
thought to the intricacies of security on a <i>var'aq</i>-based system;
its primary functions are limited to creating, reading, writing, and
appending files and it makes no pretensions of being a production-quality
filesystem. <p>
Certain non-Earthly features do exist, however; there is no concept of a
file descriptor inherent in the design. File reads and writes are done by
copying text data (no binary data at this stage) into and out of strings.
(A close equivalent to a file descriptor in vfs would be a variable with
an attached pathname; this is a fairly common idiom in systems that must
keep constant access to specific files, but is not explicitly a part of
the filesystem.) <p>
<h4>F.1.2 Pathnames/<i>SammoHpongmey</i></h4><p>
This document makes frequent reference to pathnames (<i>SammoHpongmey</i>
or beacon-names). The precise meaning of this term approximates the Earth
understanding of the term, though it may also include out-of-band
information such as authentication tickets and content filters.
<h4>F.1.3 vfs Error Codes</h4><p>
All vfs functions have basically similar error semantics. Since the system
is stateless, any function that cannot find the file it's looking for will
return a null pathname (SammoH Hegh, dead beacon).
<h3>F.2 Creating and Deleting Files</h3><p>
<h4>F.2.1 fcreate/cher_De'ghom</h4><p>
<i>pathname <b>cher_De'ghom</b> -</i><p>
Creates a file with the specified <i>pathname</i>.
<h4>F.2.2 flock/Doq_De'ghom</h4><p>
<i>pathname <b>Doq_De'ghom</b> -</i><p>
Restricts write access to the file at <i>pathname</i> to the current
process. Generally used in roughly the same place as an <i>fopen()</i> in
C, though the semantics are drastically different.<p>
<h4>F.2.3 funlock/DoqHa'_De'ghom</h4><p>
<i>pathname <b>DoqHa'_De'ghom</b> -</i><p>
Unlocks the file at <i>pathname</i>. This is generally handled by the
filesystem garbage collector at process termination time, but it is
considered good practice to take care of it yourself, especially in an
embedded environment.<p>
<h4>F.2.4 fdelete/HoH_De'ghom</h4><p>
<i>pathname <b>HoH_De'ghom</b> -</i><p>
Removes the file at <i>pathname</i>. <p>
<h3>F.3 Reading and Writing Files</h3><p>
<h4>F.3.1 fread/jotlh_De'ghom</h4><p>
<i>pathname <b>jotlh_De'ghom</b> str </i><p>
Copies the contents of the file at <i>pathname</i> into <i>str</i>;
returns null pathname on failure.<p>
<h4>F.3.2 fwrite/tatlh_De'ghom</h4><p>
<i>str pathname <b>tatlh_De'ghom</b> -</i><p>
Replaces the contents of the file at <i>pathname</i> with <i>str</i>.<p>
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