solution integrated in the C code (creating rendered graphics) and / or a
JavaScript-based solution which renders graphs in the browser.
+ In the future it shall be possible to use multiple data providers in
+ parallel. The vision is to have multiple servers running RRDCacheD. Data is
+ distributed to those servers using the "Hashed" match of collectd and then a
+ unified interface is provided via c4.
+
+
+Dependencies
+------------
+
+ c4 currently requires the following libraries:
+
+ * libfcgi
+ <http://www.fastcgi.com/>
+
+ * librrd_th (thread-safe version of librrd)
+ <http://oss.oetiker.ch/rrdtool/>
+
+ * libyajl
+ <http://lloyd.github.com/yajl/>
+
+ The "configure" script is currently kept minimal. It may therefore be
+ necessary to set the CPP- and LD-flags manually. In case of libyajl, which is
+ not built with libtool, you may need to set the rpath, too.
+
+
+Bugs
+----
+
+ * Sending a FLUSH command to the collectd process is not yet possible.
+ * "*_get_rrdargs" functions and other RRDtool specific cruft is still all
+ over the code-base.
+ * The JSON-based interface is unstable.
+ * Currently it's not possible to display more than one graph at a time.
+ (With a very limited and undocumented exception.)
+ * Speaking of which: There is no documentation.
+ * ... (to be added)
+
License
-------
version 2.1. The exact license terms are available in the file "COPYING" in
the top source directory.
+ c4 includes the JavaScript library "jQuery" which is dual-licensed under the
+ MIT license and the GPL. The file "share/jquery-1.4.2.min.js" includes a
+ license header which points you to more detailed information.
+
+ c4 includes the JavaScript libraries "Raphaël" and "gRaphaël" which are
+ licensed under the MIT license. The files "share/raphael-min.js",
+ "share/g.raphael-min.js", and "share/g.line-min.js" each include a license
+ header which points you to more detailed information.
+
Author
------