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    Command:

    keyctl_link

    
    
    
    

    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                  The key or the keyring specified have been revoked.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),
    
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