|| Linux Programmer's Manual
NAME lookup_dcookie - return a directory entry's path
, char *
Look up the full path of the directory entry specified by the value
. 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.
() 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.
The buffer was not valid.
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.
The name could not fit in the buffer.
The kernel could not allocate memory for the temporary buffer holding the path.
The process does not have the capability
CAP_SYS_ADMIN required to look up cookie values.
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.
lookup_dcookie() is Linux-specific.
() 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/.