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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | LINKING | SEE ALSO | COLOPHON |
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The key specified had been revoked.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 2017-07-05. 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(2), keyctl(3), keyrings(7)