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KEYCTL_LINK(3)            Linux Key Management Calls            KEYCTL_LINK(3)
NAME
       keyctl_link, keyctl_unlink - link/unlink a key to/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  appropri-
       ate 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              The key or the keyring specified have been revoked.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 owner's 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(3),
       keyrings(7), keyutils(7)
Linux                             4 May 2006                    KEYCTL_LINK(3)