Technical data

SunOS 5.5 STREAMS Modules tirdwr(7M)

The action taken on messages with control portions will be as follows:

Messages that represent expedited data generate an error. All

further system calls associated with the stream fail with errno

set to EPROTO.

Any data messages with control portions have the control

portions removed from the message before to passing the

message on to the upstream neighbor.

Messages that represent an orderly release indication from

the transport provider generate a zero lengthdata message,

indicating the end of ﬁle, which will be sent to the reader of

the stream. The orderly release message itself is freed by the

module.

Messages that represent an abortive disconnect indication

from the transport provider cause all further write and

putmsg system calls to fail with errno set to ENXIO. All

further read and getmsg system calls return zero lengthdata

(indicating end of ﬁle) once all previous data has beenread.

With the exception of the above rules, all other messages with

control portions generate an error and all further system calls

associated with the stream will fail with errno set to

EPROTO.

Any zero lengthdata messages are freed by the module and they are

not passed onto the module’s upstream neighbor.

pop When the module is popped off the stream or the stream is closed, the module

takes the following action:

If an orderly release indication has been previously received, then an

orderly release request will be sent to the remote side of the transport

connection.

SEE ALSO intro(2), getmsg(2), putmsg(2), read(2), write(2), intro(3), streamio(7I), timod(7M)

STREAMS Programming Guide

Transport Interfaces Programming Guide

modiﬁed 3 Jul 1990 7M-375