1 files changed, 34 insertions, 0 deletions
diff --git a/doc/libunixonacid/skaclient.html b/doc/libunixonacid/skaclient.html
index 7deb38b..f4b3020 100644
--- a/doc/libunixonacid/skaclient.html
+++ b/doc/libunixonacid/skaclient.html
@@ -27,6 +27,40 @@ and implemented in the <tt>libskarnet.a</tt> or <tt>libskarnet.so</tt> library.
 <h2> General information </h2>
 
 <p>
+ <tt>skaclient</tt> is a client-server initiation protocol framework, allowing a process
+(the "client") to either connect to another process (the "server") via a Unix domain socket,
+or spawn such a "server" process itself. The client and the server then communicate
+via <em>two</em> sockets, one for synchronous data, the other for asynchronous
+data; they exchange <a href="unixmessage.html">unixmessages</a>.
+</p>
+
+<p>
+ The <tt>skaclient</tt> framework is used in several places in skarnet.org software,
+whenever a server can send asynchronous data to its client. For instance:
+</p>
+
+<ul>
+ <li> Communication between notification subscribers such as
+<a href="http://skarnet.org/software/s6/s6-ftrig-wait.html">s6-ftrig-wait</a>
+and their own <a href="http://skarnet.org/software/s6/s6-ftrigrd.html">s6-ftrigrd</a>
+daemon </li>
+ <li> Communication between clients of the
+<a href="http://skarnet.org/software/s6/libs6lock/">s6lock library</a> and a
+<a href="http://skarnet.org/software/s6/libs6lock/s6lockd.html">s6lockd
+server</a> </li>
+ <li> Communication between a client such as
+<a href="http://skarnet.org/software/s6-dns/s6-dnsip4-filter.html">s6-dnsip4-filter</a>,
+in need of asynchronous DNS service, and its own
+<a href="http://skarnet.org/software/s6-dns/skadns/skadnsd.html">skadnsd</a>
+daemon </li>
+ <li> The <a href="http://skarnet.org/software/skabus/">skabus</a> Unix bus
+infrastructure is entirely based on the skaclient framework to transmit
+unixmessages across processes. </li>
+</ul>
+
+<h2> Programming </h2>
+
+<p>
 FIXME: to be completed.
 </p>