KEYCTL_LINK(3)						    Linux Key Management Calls						    KEYCTL_LINK(3)

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  appro-
       priate 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	      The key or the keyring specified have been revoked.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_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)

Linux								    4 May 2006							    KEYCTL_LINK(3)