SVR5 and SCO OpenServer 5

M_START(D7str)

M_START, M_STOP, M_STARTI, M_STOPI -- pause or restart device output or input

Description

The M_START and M_STOP messages request devices to start or stop their output. The M_STARTI and M_STOPI messages are similar but are used to start and stop input. They are intended to produce momentary pauses in a device's output or input, not to turn devices on or off.

The message format is not defined by STREAMS and its use is developer-dependent. These messages can be considered special cases of an M_CTL message. These messages cannot be generated by a user-level process, and each is always discarded if passed to the Stream head.

Message type

Priority.

Version applicability

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

Differences between versions

M_START and M_STOP are supported on both SCO SVR5 2.0 and SCO OpenServer 5 Release 5. M_STARTI and M_STOPI are supported on SCO SVR5 2.0 but are not supported on SCO OpenServer 5 Release 5.

References

M_CTL(D7str), streamio