keyctl_describe() describes the attributes of a key as a NUL-
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:
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-
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.
This page is part of the keyutils (key management utilities) project.
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Linux 4 May 2006 KEYCTL_DESCRIBE(3)