TECHNICAL INFORMATION DOCUMENT

TITLE:  PTF273 - asyc, asyhp and iasy Drivers patch
DATE:  01SEP95
README FOR:  PTF273
PRODUCT and VERSION:

UnixWare 1.1

Installation Instructions:  

DATATYPE: datastream

1.  Download the ptf273.Z and ptf273.txt files to the /tmp directory  
    on your machine.

2.  Read the release notes contained in this file and follow the 
    instuctions to add the package to your system.

3.  Now become root, uncompress the file and add the package to your 
    system using the following commands:

        $ su
        # uncompress /tmp/ptf273.Z
        # pkgadd -d /tmp/ptf273

ENGINEERING REALEASE NOTES
--------------------------

Title
-----

PTF273 - asyc, asyhp and iasy Drivers patch

Product And Version
-------------------

UnixWare 1.1, UnixWare 1.1.1, UnixWare 1.1.2, Unixware 1.1.3, Unixware 1.1.4.

Abstract
--------

This patch installs the following updated file:

	/etc/conf/pack.d/asyc/Driver.o
	/etc/conf/pack.d/asyc/space.c
	/etc/conf/pack.d/asyhp/Driver.o
	/etc/conf/pack.d/asyhp/space.c
	/etc/conf/pack.d/iasy/Driver.o
	/etc/conf/pack.d/iasy/space.c
	/usr/include/sys/asyc.h

Symptom
--------

PTF273 resolves several asyc and iasy problems reported by the customers:

	- The iasy driver's close() routine went to sleep forever
		waiting for output to drain.

	- When software flow control was in effect and the driver 
		tried to resume data flow with an XON, it streamed 
		forever XON's to the remote. This can be seen 
		thru a serial line analyzer. For the end users' point
		of view, there is no obvious problem.

	- system panic: timeout table overflow when calling iasyclose().

	- hardware flow control feature broken.


SOLUTION SPECIFICS
------------------

General Description.
-------------------

This patch eliminated the above symptoms as well as provided
the new feature described below. 

This PTF supercedes ptf122 and ptf639.

New Features.
------------

- ioctl (TIOCMGET and TIOCMSET) are added to allow
	developers to get and set the modem bit status 
	of the serial driver.


Software Notes and Recommendations.
----------------------------------

	This PTF can be installed on UnixWare 1.1 and UnixWare 1.1.1 
	thru 1.1.4 systems.

Testing of the modified software contained in this package has been
conducted only to the extent necessary to confirm that it resolves the
problem(s) stated above ("Symptom").  Such testing consists of
recreating the problem conditions and verifying that the problem no 
longer occurs.  No other testing of this software has been done.

Hardware Notes and Recommendations.
----------------------------------

This PTF is targeted for the i386, i486 and Pentium CPU's.