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Welcome
=======

Crossroads I/O ("libxs") is a library for building scalable and high
performance distributed applications.  It fits between classic BSD sockets,
JMS/AMQP-style message queues, and enterprise message-oriented middleware.

Crossroads I/O extends the standard socket interfaces with features
traditionally provided by specialised messaging middleware products,
providing an abstraction of asynchronous message queues, multiple messaging
patterns, message filtering (subscriptions), seamless access to multiple
transport protocols, and more.

Crossroads I/O provides a native C API for applications.  Support for many
more languages is provided by the community through language bindings which
can be found at the Crossroads website.


Building and Installation
-------------------------

The following instructions apply to building libxs from an official release
downloaded from the Crossroads I/O website.  For building directly from Git,
refer to the `INSTALL` file included with the libxs distribution.

On POSIX platforms, libxs uses the standard autotools build system.  To
build and install the library, ensure your system has a C++ compiler
installed, and proceed with the following steps:

1. Run `./configure`, then `make` to build the library.
2. Optionally, run `make check` to run the built in test suite.
3. Run `make install` as root.
4. On Linux or other platforms which use `ld.so` for dynamic linking, run
   `ldconfig` or equivalent as root to update your system's shared library
   cache.

On Windows, solution files for Visual C++ 2010 are provided in the
`builds/msvc/` subdirectory of the distribution.

Refer to the `INSTALL` file included with the libxs distribution for more
detailed installation instructions.


ZeroMQ Compatibility
--------------------

Crossroads I/O provides a drop-in 'libzmq' compatibility library for ZeroMQ
language bindings and applications. To enable 'libzmq' compatibility, you
must build your copy of libxs with the `--enable-libzmq` option to
configure, or on Windows by building the appropriate solution file.

For further details refer to the `doc/xs_zmq.html` or the `xs_zmq(7)`
manual page included with this distribution.

NOTE: Enabling this option will *overwrite* any existing installation of
`libzmq` on your system.


Reporting Bugs
--------------

To report a bug, send an email describing your problem to the Crossroads
mailing list.  To make sure your bug report won't be missed, you can file a
report in the bug tracker[1].

To help Crossroads developers to fix the bug, please try to provide a minimal
test program, ideally written in C, that reproduces the problem you are
reporting.

NOTE: The bug tracker exists primarily to track bugs and pertinent data (test
cases, crash logs, etc.).  You should not use it for _discussion_.  In the bug
tracker your audience will be very limited.  Mailing list serves the purpose of
discussing bugs much better.


Contributing to the Project
---------------------------

Before contributing to the project make sure you understand the legal
implications of doing so.  These are outlined on the Crossroads I/O website[2].

To submit your contribution, send it as a patch (using `git format-patch`, `diff`,
or similar) to the mailing list.  Make sure to use your real name, and prefix
the subject of your post with `[PATCH]`.

All contributions will be reviewed and, if they pass review, accepted.  For more
details refer to the website[3].


Resources
---------

The libxs development Git tree can be found on Github[4].

Development is coordinated on the mailing list[5].
Visit the archives[6] to join or view archives
of previous discussion.

Extensive documentation is provided with the distribution.  Refer to
`doc/xs.html`, or the `xs(7)` manual page after you have installed libxs on
your system.

Further resources, language bindings, tutorials, and more can be found on
the Crossroads website[7].


Copying
-------

Free use of this software is granted under the terms of the GNU Lesser General
Public License (LGPL).  For details see the files `COPYING` and `COPYING.LESSER`
included with the libxs distribution.

As a special exception, the copyright holders of libxs grant you the right
to link the library statically with your software.  Refer to the end of
the `COPYING.LESSER` file included with the libxs distribution for details.

Footnotes
---------

[1]: Bug tracker: https://github.com/crossroads-io/libxs/issues

[2]: Legal information: http://www.crossroads.io/dev:legal

[3]: Code review: http://www.crossroads.io/dev:code-review

[4]: Source code: http://github.com/crossroads-io                 

[5]: Mailing list: crossroads-dev@groups.crossroads.io

[6]: Mailing list archives: http://groups.crossroads.io/

[7]: Project website: http://www.crossroads.io/