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 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	      The key or the keyring specified have been revoked.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),
       request-key(8)



Linux				  4 May 2006			KEYCTL_LINK(3)