SVR5 and SCO OpenServer 5

M_CTL(D7str)

M_CTL, M_PCCTL -- send information to a particular module or type of module

Description

M_CTL and M_PCCTL are generated by modules that wish to send information to a particular module or type of module. M_CTL messages are typically used for intermodule communication, as when adjacent STREAMS protocol modules negotiate the terms of their interface. An M_CTL message cannot be generated by a user-level process and is always discarded if passed to the Stream head.

Message type

M_CTL is ordinary (non-priority); M_PCCTL is priority.

Version applicability

ddi: 1, 2, 3, 4, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp

M_PCTL is oddi: 1, 2, 2mp, 3, 3mp, 4, 4mp, 5, 5mp
M_PCCTL is not available in ODDI.

References

M_BREAK(D7str), streamio