NAME
keyctl_link - Link a key to a keyring keyctl_unlink - Unlink a key from a keyring
SYNOPSIS
#include <keyutils.h>
long keyctl_link(key_serial_t key, key_serial_t keyring);
long keyctl_unlink(key_serial_t key, key_serial_t keyring);
DESCRIPTION
keyctl_link() creates a link from keyring to key, displacing any link to another key of the same type and description in that keyring if one exists.
keyctl_unlink() removes the link from keyring to key if it exists.
The caller must have write permission on a keyring to be able create or remove links in it.
The caller must have link permission on a key to be able to create a link to it.
RETURN VALUE
On success keyctl_link() and keyctl_unlink() return 0. On error, the value -1 will be returned and errno will have been set to an appropriate error.
ERRORS
ENOKEY | The key or the keyring specified are invalid. |
EKEYEXPIRED | |
The key or the keyring specified have expired. | |
EKEYREVOKED | |
The key or the keyring specified have been revoked. | |
EACCES | The keyring exists, but is not writable by the calling process. |
For keyctl_link() only: | |
ENOMEM | Insufficient memory to expand the keyring |
EDQUOT | Expanding the keyring would exceed the keyring owners quota. |
EACCES | The key exists, but is not linkable by the calling process. |
LINKING
This is a library function that can be found in libkeyutils. When linking, -lkeyutils should be specified to the linker.
SEE ALSO
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl_get_keyring_ID(3), keyctl_join_session_keyring(3), keyctl_update(3), keyctl_revoke(3), keyctl_chown(3), keyctl_setperm(3), keyctl_describe(3), keyctl_clear(3), keyctl_search(3), keyctl_read(3), keyctl_instantiate(3), keyctl_negate(3), keyctl_set_reqkey_keyring(3), keyctl_set_timeout(3), keyctl_assume_authority(3), keyctl_describe_alloc(3), keyctl_read_alloc(3), request-key(8)