Add section about utility functions in filters

1 files changed, 25 insertions, 5 deletions

diff --git a/doc/bird.sgml b/doc/bird.sgml
index 88726289..c0699f73 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -54,7 +54,8 @@ configuration primitives, <cf> is fragment of configuration within normal
 <p>Bird is configured using text configuration file. At startup, bird
 reads <file/bird.conf/ (unless -c command line parameter is
 given). Everything on a line after <cf/#/ is a comment, whitespace is
-ignored. If there's variable number of options, it is grouped using
+ignored, C-style comments <cf>/* comment */</cf> are also
+recognized. If there's variable number of options, it is grouped using
 <cf/{ }/ brackets. Each option is terminated by <cf/;/.
 
 <p>Really simple configuration file might look like this, you can find
@@ -328,21 +329,33 @@ if 1234 = i then printn "."; else { print "*** FAIL: if 1 else"; }
 	<tag>defined( <m>attribute</m> )</tag>
 	returns TRUE if given attribute is defined. Access to undefined attribute results in runtime error.
 
-	<tag/prefix network/
+	<tag/<m/prefix/ network/
 	network this route is talking about.
 
-	<tag/ip from/
+	<tag/<m/ip/ from/
 	who told me about this route.
 	
-	<tag/ip gw/
+	<tag/<m/ip/ gw/
 	what is nexthop packets routed using this route should be forwarded to.
 
-	<tag/enum source/
+	<tag/<m/enum/ source/
 	what protocol told me about this route. This can have values such as <cf/RTS_RIP/ or <cf/RTS_OSPF_EXT/.
 </descrip>
 
 <p>Plus, there are protocol-specific attributes, which are described in protocol sections.
 
+<sect1>Utility functions
+
+<p>There are few functions you might find convient to use:
+
+<descrip>
+	<tag>print <m/expr/ [ <m/, expr .../ ]</tag>
+	prints given expressions, usefull mainly while debugging filters.
+
+	<tag>quitbird</tag>
+	terminates bird. Usefull while debugging filter interpretter.
+</descrip>
+
 <sect>Protocols
 
 <sect1>Rip
@@ -426,8 +439,15 @@ protocol rip MyRIP_test {
 }
 </code>
 
+<sect>Getting more help
+
+<p>This is really last section of this file, should give pointers to
+programmers documentation, web pages mailing lists and similar stuff.
+
+
 </article>
 
+
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