SVR5 and SCO OpenServer 5

M_DATA(D7str)

M_DATA -- carry ordinary data

Description

Intended to contain ordinary data. Messages allocated by the allocb(D3str) routine are type M_DATA by default. M_DATA messages are generally sent bidirectionally on a Stream, and their contents can be passed between a process and the Stream head. In the getmsg and putmsg system calls, the contents of M_DATA message blocks are referred to as the data part. Messages composed of multiple message blocks typically have M_DATA as the message type for all message blocks following the first.

Message type

Ordinary (non-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

References

streamio