опишите ключ (describe a key)
Имя (Name)
keyctl_describe - describe a key
Синопсис (Synopsis)
#include <keyutils.h>
long keyctl_describe(key_serial_t key, char *buffer,
size_tbuflen);
long keyctl_describe_alloc(key_serial_t key, char **_buffer);
Описание (Description)
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.
Возвращаемое значение (Return value)
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.
Ошибки (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The key specified had been revoked.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.
Ссылки (Linking)
This is a library function that can be found in libkeyutils.
When linking, -lkeyutils should be specified to the linker.
Смотри также (See also)
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
keyrings(7), keyutils(7)
