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CentOS 7.0 - man page for lookup_dcookie (centos section 2)

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LOOKUP_DCOOKIE(2)		    Linux Programmer's Manual			LOOKUP_DCOOKIE(2)

NAME
       lookup_dcookie - return a directory entry's path

SYNOPSIS
       int lookup_dcookie(u64 cookie, char *buffer, size_t len);

DESCRIPTION
       Look up the full path of the directory entry specified by the value 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 lookup_dcookie() to return successfully, the kernel must still hold a cookie reference
       to the directory entry.

RETURN VALUE
       On success, lookup_dcookie() returns the length of the path string copied into the buffer.
       On error, -1 is returned, and errno is set appropriately.

ERRORS
       EFAULT The buffer was not valid.

       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.

       ENAMETOOLONG
	      The name could not fit in the buffer.

       ENOMEM The kernel could not allocate memory for the temporary buffer holding the path.

       EPERM  The process does not have the capability CAP_SYS_ADMIN required to look  up  cookie
	      values.

       ERANGE The buffer was not large enough to hold the path of the directory entry.

VERSIONS
       Available since Linux 2.5.43.  The ENAMETOOLONG error return was added in 2.5.70.

CONFORMING TO
       lookup_dcookie() is Linux-specific.

NOTES
       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.

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2004-06-17				LOOKUP_DCOOKIE(2)


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