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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
LOOKUP_DCOOKIE(2) Linux Programmer's Manual LOOKUP_DCOOKIE(2)
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.
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.
Available since Linux 2.5.43. The ENAMETOOLONG error return was
added in 2.5.70.
lookup_dcookie() is Linux-specific.
lookup_dcookie() is a special-purpose system call, currently used
only by the oprofile(1) 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.
oprofile(1)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2016-07-17 LOOKUP_DCOOKIE(2)
Pages that refer to this page: syscalls(2)