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[linuxjm/LDP_man-pages.git] / original / man2 / lookup_dcookie.2

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-.\" Copyright (C) 2003 John Levon <levon@movementarian.org>
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" Modified 2004-06-17 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.TH LOOKUP_DCOOKIE 2 2004-06-17 "Linux" "Linux Programmer's Manual"
-.SH NAME
-lookup_dcookie \- return a directory entry's path
-.SH SYNOPSIS
-.BI "int lookup_dcookie(u64 " cookie ", char *" buffer ", size_t " len );
-.SH DESCRIPTION
-Look up the full path of the directory entry specified by the value
-.IR cookie .
-The cookie is an opaque identifier uniquely identifying a particular
-directory entry.
-The buffer given is filled in with the full path of the directory entry.
-
-For
-.BR lookup_dcookie ()
-to return successfully,
-the kernel must still hold a cookie reference to the directory entry.
-.SH RETURN VALUE
-On success,
-.BR lookup_dcookie ()
-returns the length of the path string copied into the buffer.
-On error, \-1 is returned, and
-.I errno
-is set appropriately.
-.SH ERRORS
-.TP
-.B EFAULT
-The buffer was not valid.
-.TP
-.B EINVAL
-The kernel has no registered cookie/directory entry mappings at the
-time of lookup, or the cookie does not refer to a valid directory entry.
-.TP
-.B ENAMETOOLONG
-The name could not fit in the buffer.
-.TP
-.B ENOMEM
-The kernel could not allocate memory for the temporary buffer holding
-the path.
-.TP
-.B EPERM
-The process does not have the capability
-.B CAP_SYS_ADMIN
-required to look up cookie values.
-.TP
-.B ERANGE
-The buffer was not large enough to hold the path of the directory entry.
-.SH VERSIONS
-Available since Linux 2.5.43.
-The
-.B ENAMETOOLONG
-error return was added in 2.5.70.
-.SH CONFORMING TO
-.BR lookup_dcookie ()
-is Linux-specific.
-.SH NOTES
-.BR lookup_dcookie ()
-is a special-purpose system call, currently used only by the oprofile profiler.
-It relies on a kernel driver to register cookies for directory entries.
-
-The path returned may be suffixed by the string " (deleted)" if the directory
-entry has been removed.
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.