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    Command:

    keyctl_update

    
    
    

    SYNOPSIS

           #include <keyutils.h>
    
           long keyctl_update(key_serial_t key, const char *payload,
           size_t plen);
    
    
    

    DESCRIPTION

           keyctl_update()  updates  the  payload of a key if the key type permits
           it.
    
           The caller must have write permission on a key to be able update it.
    
           payload and plen specify the data for the new payload.  payload may  be
           NULL  and  plen may be zero if the key type permits that.  The key type
           may reject the data if it's in the wrong format or in  some  other  way
           invalid.
    
    
    

    RETURN VALUE

           On  success  keyctl_update() returns 0.  On error, the value -1 will be
           returned and errno will have been set to an appropriate error.
    
    
    

    ERRORS

           ENOKEY The key specified is invalid.
    
           EKEYEXPIRED
                  The key specified has expired.
    
           EKEYREVOKED
                  The key specified had been revoked.
    
           EINVAL The payload data was invalid.
    
           ENOMEM Insufficient memory to store the new payload.
    
           EDQUOT The key quota for this user would be exceeded by increasing  the
                  size of the key to accommodate the new payload.
    
           EACCES The key exists, but is not writable by the calling process.
    
           EOPNOTSUPP
                  The  key type does not support the update operation on its keys.
    
    
    

    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),
    
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