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This is README.SCO Last Modified Thu Oct 18 13:58:28 MDT 2001
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UnixWare and OpenUNIX related Documentation
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This document is the release notes From Caldera before the merge see notes.
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Java Communications API Implementation for Caldera UNIX Operating Systems
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-------------------------------------------------------------------------------
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This was Version 2.0 Beta-3 notes. The work is being merged into the rxtx CVS.
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Some minor changes will happen and will be noted here.
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Thanks to Jonathan Schilling <jls@caldera.com> and Caldera for the SCO port!
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1) RXTX does not ship with Sun's comm.jar. It can be obtained from Sun.
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2) The Lockfile could use some work. It possible to fix it at compile time
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but a run time solution would allow. The current behavior is to use FHS
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locks. This should be the same behavior as rxtx-1.4-8 as used in the
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3) in configure.in you will want to comment out 2 lines and run autoconf in
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the top rxtx directory before building. The lines are:
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# Comment these two lines out when compiling on SCO
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-------------------------------------------------------------------------------
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These are the Release Notes for the beta release of an implementation of
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the Java Communications API (also known as javax.comm) for Caldera UNIX
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The Java Communications API is described at
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http://java.sun.com/products/javacomm/index.html.
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This implementation is available for the following Caldera UNIX operating
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OpenServer 5.0.6 with rs506a supplement
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A prerequisite is that Java 2 Standard Edition v. 1.3.0 for Caldera UNIX
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Operating Systems must already have been installed (including any
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packages or ptfs required by J2SE 1.3.0). This requirement may be met
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by either the J2SE SDK (package java2sdk3) or the J2SE Runtime Environment
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While J2SE 1.3.0 for OpenServer does not require the rs506a release
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supplement be installed, this javax.comm implementation does.
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This implementation is a port of the open source RXTX implementation of
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the Java Communications API. Information about RXTX may be found at
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http://www.rxtx.org. This port has been done off of RXTX version 1.4-8.
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RXTX includes part of the Sun Java Communications API implementation
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for Solaris/x86, version 2.0. This part (the comm.jar file) is included
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in this distribution; you do not need to download it from the Sun web page.
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To install this beta implementation, place the javaxcomm.ds file somewhere.
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Go there, become root, and then do:
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# pkgadd -d 'pwd`/javaxcomm.ds
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This will install package javaxcomm, which places the following files into
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the J2SE 1.3.0 directory structure:
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/usr/java2/jre/lib/ext/comm.jar
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/usr/java2/jre/lib/ext/jcl.jar
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/usr/java2/jre/lib/x86at/libSerial.so
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/usr/java2/jre/lib/x86at/libParallel.so
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/usr/java2/jre/lib/javax.comm.properties
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/usr/java2/javax.comm-ReleaseNotes.txt [this file]
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Alternatively, if you are installing the Java Communications API in
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conjunction with the J2SE Runtime Environment rather than the J2SE SDK,
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then use the jrexcomm.ds file instead:
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# pkgadd -d 'pwd`/jrexcomm.ds
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which will install the following files as part of package jrexcomm:
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/usr/jre2/lib/ext/comm.jar
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/usr/jre2/lib/ext/jcl.jar
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/usr/jre2/lib/x86at/libSerial.so
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/usr/jre2/lib/x86at/libParallel.so
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/usr/jre2/lib/javax.comm.properties
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/usr/jre2/javax.comm-ReleaseNotes.txt [this file]
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You can install both the javaxcomm and jrexcomm packages if you desire,
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as long as you have both java2sdk3 and java2jre3 installed.
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The installed binaries of either Java Communications API package are used
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for all three Caldera UNIX platforms. (On OpenServer, the native code
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libraries are executed via the OSRcompat binary compatibility module,
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just as the native code layers of J2SE 1.3.0 are.)
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To use this implementation of Java Communications API, just compile and
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run Java as you normally would. Because the above files are installed
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into the standard J2SE 1.3.0 extension space, there is no need to set
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CLASSPATH or LD_LIBRARY_PATH to access the Java Communications API.
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A simple test of the serial I/O part of this implementation can be
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done as follows. Set up a null modem RS-232 cable between two machines.
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Become root. Run the open source "minicom" tool
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(see http://www.pp.clinet.fi/~walker/minicom.html) on each machine
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and verify that the connection is working, by typing characters back
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and forth between the two machines. Caldera can make available
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minicom-ou8-uw7 and minicom-osr5, ported versions of minicom for
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the Caldera UNIX platforms. (Note that you need to first do
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"minicom -s" to tell it about the names and speeds of your serial ports.
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When you then run "minicom", use the ctrl-A E and ctrl-A A commands to
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turn on local echo and linefeed add.)
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Once working serial communication has been verified, shut down minicom
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on the machine that Java Communications API is installed on. Untar the
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Sun SerialDemo demo program, which is SerialDemo.tar and can be made
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available by Caldera. Change into the SerialDemo directory, and run
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# /usr/java2/bin/java SerialDemo
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# /usr/jre2/bin/java SerialDemo
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This should bring up a GUI. Change the serial device port name and speed
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in the GUI if necessary, then click "Open Port". (Contact Caldera if the
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port name you are interested in does not appear in the GUI.) Type into the
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top pane and text should appear in the minicom window on the other machine.
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Type into the minicom window on the other machine and text should appear
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in the middle pane of the SerialDemo GUI. Click "Close Port" to finish.
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This implementation uses the normal UNIX "lock file" protocol to protect
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serial ports from concurrent access. This means that javax.comm will
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not be able to access the port if it is already locked by another
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serial application (whether javax.comm, non-Java, or a system command),
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and vice versa. In the case where javax.comm is locked out, you may get
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a message containing the phrase "Port currently owned by unknown Solaris
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Application"; for "Solaris" read the Caldera UNIX operating system you
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Additional sample programs using the Java Communications API are available
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as part of the Sun Solaris/x86 implementation and can be downloaded from
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http://java.sun.com/products/javacomm/index.html. (Do not use the
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SimpleRead and SimpleWrite programs without modification, since they fail
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to properly close the serial port at program completion.)
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The lock files in Open UNIX 8 and UnixWare 7 will protect against
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concurrent port access by multiple javax.comm applications, but will not
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protect against concurrent access by other applications or system commands
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that use the SVR4 serial lock file protocol (/var/spool/locks/LK.m.m.m).
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This will be corrected in the final release. On OpenServer, the lock files
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protect against all concurrent access, assuming other applications are
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using the standard protocol there (/usr/spool/uucp/LCK..tty?A).
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The parallel I/O part of this implementation has not been tested at all
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on any Caldera UNIX platforms.
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RXTX is available under the GNU Library General Public License (LGPL).
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Because this is still just an beta level implementation, the ported
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source code for RXTX is not included with this distribution. Once this
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implementation is final, source code will be included. If you would
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like the source code for this beta implementation, please contact
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Caldera and it will be sent to you.
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