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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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2004-06-17                 LOOKUP_DCOOKIE(2)