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    Command:

    lookup_dcookie

    
    
    

    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 par-
           ticular  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 direc-
                  tory 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.
    
    
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