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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | LINKING | SEE ALSO | COLOPHON |
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KEYCTL_DESCRIBE(3) Linux Key Management Calls KEYCTL_DESCRIBE(3)
keyctl_describe - describe a key
#include <keyutils.h>
long keyctl_describe(key_serial_t key, char *buffer,
size_tbuflen);
long keyctl_describe_alloc(key_serial_t key, char **_buffer);
keyctl_describe() describes the attributes of a key as a NUL-
terminated string.
The caller must have view permission on a key to be able to get a
description of it.
buffer and buflen specify the buffer into which the key
description will be placed. If the buffer is too small, the full
size of the description will be returned, and no copy will take
place.
keyctl_describe_alloc() is similar to keyctl_describe() except
that it allocates a buffer big enough to hold the description and
places the description in it. If successful, A pointer to the
buffer is placed in *_buffer. The caller must free the buffer.
The description will be a string of format:
“%s;%d;%d;%08x;%s”
where the arguments are: key type name, key UID, key GID, key
permissions mask and key description.
NOTE! The key description will not contain any semicolons, so
that should be separated out by working backwards from the end of
the string. This permits extra information to be inserted before
it by later versions of the kernel simply by inserting more
semicolon-terminated substrings.
On success keyctl_describe() returns the amount of data placed
into the buffer. If the buffer was too small, then the size of
buffer required will be returned, but no data will be transferred.
On error, the value -1 will be returned and errno will have been
set to an appropriate error.
On success keyctl_describe_alloc() returns the amount of data in
the buffer, less the NUL terminator. On error, the value -1 will
be returned and errno will have been set to an appropriate error.
ENOKEY The key specified is invalid.
EKEYEXPIRED
The key specified has expired.
EKEYREVOKED
The key specified had been revoked.
EACCES The key exists, but is not viewable by the calling process.
This is a library function that can be found in libkeyutils. When
linking, -lkeyutils should be specified to the linker.
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
keyrings(7), keyutils(7)
This page is part of the keyutils (key management utilities)
project. Information about the project can be found at [unknown
-- if you know, please contact man-pages@man7.org] If you have a
bug report for this manual page, send it to
keyrings@linux-nfs.org. This page was obtained from the project's
upstream Git repository
⟨http://git.kernel.org/pub/scm/linux/kernel/git/dhowells/keyutils.git⟩
on 2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2023-03-20.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
Linux 4 May 2006 KEYCTL_DESCRIBE(3)
Pages that refer to this page: KEYCTL_DESCRIBE(2const), keyctl(3), keyrings(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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