147 lines
3.5 KiB
HTML
147 lines
3.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of LOOKUP_DCOOKIE</TITLE>
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</HEAD><BODY>
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<H1>LOOKUP_DCOOKIE</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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lookup_dcookie - return a directory entry's path
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>int lookup_dcookie(u64 </B><I>cookie</I><B>, char *</B><I>buffer</I><B>, size_t </B><I>len</I><B>);</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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Look up the full path of the directory entry specified by the value
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<I>cookie</I>.
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The cookie is an opaque identifier uniquely identifying a particular
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directory entry.
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The buffer given is filled in with the full path of the directory entry.
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<P>
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For
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<B>lookup_dcookie</B>()
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to return successfully,
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the kernel must still hold a cookie reference to the directory entry.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success,
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<B>lookup_dcookie</B>()
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returns the length of the path string copied into the buffer.
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On error, -1 is returned, and
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<I>errno</I>
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is set appropriately.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="1"><B>EFAULT</B>
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<DD>
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The buffer was not valid.
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<DT id="2"><B>EINVAL</B>
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<DD>
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The kernel has no registered cookie/directory entry mappings at the
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time of lookup, or the cookie does not refer to a valid directory entry.
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<DT id="3"><B>ENAMETOOLONG</B>
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<DD>
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The name could not fit in the buffer.
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<DT id="4"><B>ENOMEM</B>
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<DD>
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The kernel could not allocate memory for the temporary buffer holding
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the path.
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<DT id="5"><B>EPERM</B>
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<DD>
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The process does not have the capability
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<B>CAP_SYS_ADMIN</B>
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required to look up cookie values.
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<DT id="6"><B>ERANGE</B>
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<DD>
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The buffer was not large enough to hold the path of the directory entry.
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</DL>
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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Available since Linux 2.5.43.
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The
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<B>ENAMETOOLONG</B>
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error return was added in 2.5.70.
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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<B>lookup_dcookie</B>()
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is Linux-specific.
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<A NAME="lbAI"> </A>
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<H2>NOTES</H2>
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<B>lookup_dcookie</B>()
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is a special-purpose system call, currently used only by the
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<B><A HREF="/cgi-bin/man/man2html?1+oprofile">oprofile</A></B>(1)
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profiler.
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It relies on a kernel driver to register cookies for directory entries.
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<P>
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The path returned may be suffixed by the string " (deleted)" if the directory
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entry has been removed.
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+oprofile">oprofile</A></B>(1)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="7"><A HREF="#lbAB">NAME</A><DD>
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<DT id="8"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="9"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="10"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="11"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="12"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="13"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="14"><A HREF="#lbAI">NOTES</A><DD>
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<DT id="15"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="16"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:33 GMT, March 31, 2021
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</BODY>
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</HTML>
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