lookup_dcookie man page on YellowDog

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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  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.

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.

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.

CONFORMING TO
       lookup_dcookie() is Linux-specific.

AVAILABILITY
       Since Linux 2.5.43.  The ENAMETOOLONG error return was added in 2.5.70.

Linux 2.6.7			  2004-06-17		     LOOKUP_DCOOKIE(2)
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