110 lines
3.6 KiB
HTML
110 lines
3.6 KiB
HTML
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The President and Fellows of Harvard College.
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-->
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<html>
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<head>
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<title>__getcwd</title>
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<link rel="stylesheet" type="text/css" media="all" href="../man.css">
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</head>
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<body bgcolor=#ffffff>
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<h2 align=center>__getcwd</h2>
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<h4 align=center>OS/161 Reference Manual</h4>
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<h3>Name</h3>
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<p>
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__getcwd - get name of current working directory (backend)
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</p>
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<h3>Library</h3>
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<p>
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Standard C Library (libc, -lc)
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>#include <unistd.h></tt><br>
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<br>
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<tt>int</tt><br>
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<tt>__getcwd(char *</tt><em>buf</em><tt>,
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size_t </tt><em>buflen</em><tt>);</tt>
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</p>
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<h3>Description</h3>
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<p>
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The name of the current directory is computed and stored in
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<em>buf</em>, an area of size <em>buflen</em>. The length of data
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actually stored, which must be non-negative, is returned.
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</p>
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<p>
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Note: this call behaves like <A HREF=read.html>read</A> - the name
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stored in <em>buf</em> is not 0-terminated.
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</p>
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<p>
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This function is not meant to be called except by the C library;
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application programmers should use <A HREF=../libc/getcwd.html>getcwd</A>
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instead.
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</p>
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<p>
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<tt>__getcwd</tt> (like all system calls) should be atomic. In
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practice, because of complications associated with locking both up and
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down trees, it often isn't quite.
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Note that the kernel is not obliged to (and generally cannot) make the
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<tt>__getcwd</tt> call atomic with respect to other threads in the same
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process accessing the transfer buffer during the operation.
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</p>
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<h3>Return Values</h3>
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<p>
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On success, <tt>__getcwd</tt> returns the length of the data returned.
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On error, -1 is returned, and <A HREF=errno.html>errno</A> is set
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according to the error encountered.
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</p>
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<h3>Errors</h3>
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<p>
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The following error codes should be returned under the conditions
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given. Other error codes may be returned for other cases not
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mentioned here.
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<table width=90%>
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<tr><td width=5% rowspan=3> </td>
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<td width=10% valign=top>ENOENT</td>
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<td>A component of the pathname no
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longer exists.</td></tr>
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<tr><td valign=top>EIO</td> <td>A hard I/O error occurred.</td></tr>
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<tr><td valign=top>EFAULT</td> <td><em>buf</em> points to an invalid
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address.</td></tr>
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</table>
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</p>
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</body>
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</html>
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