That's not what this says SOCK_DGRAM is: https://www.ibm.com/docs/en/aix/7.1?topic=protocols-socket-types https://www.ibm.com/docs/en/aix/7.1?topic=protocols-so

That's not what this says SOCK_DGRAM is: https://www.ibm.com/docs/en/aix/7.1?topic=protocols-socket-types https://www.ibm.com/docs/en/aix/7.1?topic=protocols-socket-t... I don't know how it could be. In order to send chunks of memory you first need primitives of memory that can be sent.