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   sd_bus_message_read_basic    ( 3 )

Чтение базового типа из сообщения (Read a basic type from a message)
  Name  |  Synopsis  |  Description  |    Return value    |  See also  |  Note  |

Возвращаемое значение (Return value)

On success, sd_bus_message_read_basic() returns a positive
       integer. If the end of the currently opened array has been
       reached, it returns 0. On failure, it returns 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.