1KEYCTL_LINK(3)            Linux Key Management Calls            KEYCTL_LINK(3)
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NAME

6       keyctl_link - Link a key to a keyring keyctl_unlink - Unlink a key from
7       a keyring
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SYNOPSIS

10       #include <keyutils.h>
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12       long keyctl_link(key_serial_t key, key_serial_t keyring);
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14       long keyctl_unlink(key_serial_t key, key_serial_t keyring);
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DESCRIPTION

17       keyctl_link() creates a link from keyring to key, displacing  any  link
18       to  another key of the same type and description in that keyring if one
19       exists.
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21       keyctl_unlink() removes the link from keyring to key if it exists.
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23       The caller must have write permission on a keyring to be able create or
24       remove links in it.
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26       The  caller  must  have link permission on a key to be able to create a
27       link to it.
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RETURN VALUE

30       On success keyctl_link() and keyctl_unlink() return 0.  On  error,  the
31       value  -1 will be returned and errno will have been set to an appropri‐
32       ate error.
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ERRORS

35       ENOKEY The key or the keyring specified are invalid.
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37       EKEYEXPIRED
38              The key or the keyring specified have expired.
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40       EKEYREVOKED
41              The key or the keyring specified have been revoked.
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43       EACCES The keyring exists, but is not writable by the calling process.
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45       For keyctl_link() only:
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47       ENOMEM Insufficient memory to expand the keyring
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49       EDQUOT Expanding the keyring would exceed the keyring owner's quota.
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51       EACCES The key exists, but is not linkable by the calling process.
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LINKING

54       This is a library function that can  be  found  in  libkeyutils.   When
55       linking, -lkeyutils should be specified to the linker.
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SEE ALSO

58       keyctl(1),
59       add_key(2),
60       keyctl(2),
61       request_key(2),
62       keyctl_get_keyring_ID(3),
63       keyctl_join_session_keyring(3),
64       keyctl_update(3),
65       keyctl_revoke(3),
66       keyctl_chown(3),
67       keyctl_setperm(3),
68       keyctl_describe(3),
69       keyctl_clear(3),
70       keyctl_search(3),
71       keyctl_read(3),
72       keyctl_instantiate(3),
73       keyctl_negate(3),
74       keyctl_set_reqkey_keyring(3),
75       keyctl_set_timeout(3),
76       keyctl_assume_authority(3),
77       keyctl_describe_alloc(3),
78       keyctl_read_alloc(3),
79       request-key(8)
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83Linux                             4 May 2006                    KEYCTL_LINK(3)
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