lookup_dcookie — return a directory entry's path
int lookup_dcookie( |
u64 cookie, |
| char *buffer, | |
size_t len); |
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.
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.
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.
This page is part of release 3.24 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/.
|
Copyright (C) 2003 John Levon <levonmovementarian.org> Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. Modified 2004-06-17 Michael Kerrisk <mtk.manpagesgmail.com> |