Путеводитель по Руководству Linux
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   sd_bus_message_read    ( 3 )

прочитать последовательность значений из сообщения (Read a sequence of values from a message)
  Name  |  Synopsis  |  Description  |    Return value    |  Note  |  Examples  |  See also  |

Возвращаемое значение (Return value)

On success, these functions return a non-negative integer. On
       failure, they return a negative errno-style error code.


   Errors
       Returned errors may indicate the following problems:


       -EINVAL
           Specified type string is invalid or the message parameter is
           NULL.


       -ENXIO
           The message does not contain the specified type at current
           position.


       -EBADMSG
           The message cannot be parsed.