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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 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              The key or the keyring specified have been revoked.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 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)