Read Notification on SYSV.3.2

[Harald Tempelman]

When scanning the code concerning STREAMS on SYSV.3.2 I noticed that I can do
something to get in my multiplexor driver a notification from the streams 
head when a read is done on that stream.

To get such a notification, the multiplexor can send
an M_SETOPTS message to the streams head with the field 'so_flags' set to 
SO_MREADON.  When this has been set the streams head will send an M_READ
message to my driver at the time a process will perform a read on that
stream.

But, this feature is not documented.  In the tutorials of SYSV.4, the M_READ
message still exists in an include file, but nothing else
concerning this option is mentioned.

Does anybody know about this read notification on STREAMS?  
I would like to know if it works at the moment and if this feature also
exists in further releases of SYSV.  When this works I would also know if I
understood the working of this feature correct.

Thanks,
				Harald
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| Harald Tempelman                      Internet: harald at idca.tds.philips.nl |
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