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<!-- Module User's Guide -->

<chapter>
	
	<title>&adminguide;</title>
	
	<section>
	<title>Overview</title>
	<para>
		This module collects the core pseudo-variables that can be used in
		configuration file. They are listed in Dokuwiki:
		<ulink url="http://www.kamailio.org/wiki/">http://www.kamailio.org/wiki/</ulink>,
		in Pseudo-Variables section
	</para>
	</section>
	<section>
	<title>Dependencies</title>
	<section>
		<title>&kamailio; Modules</title>
		<para>
		The following modules must be loaded before this module:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>No dependencies on other &kamailio; modules</emphasis>.
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	<section>
		<title>External Libraries or Applications</title>
		<para>
		The following libraries or applications must be installed before running
		&kamailio; with this module loaded:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>None</emphasis>.
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	</section>
	<section>
	<title>Parameters</title>
	<section>
		<title><varname>shvset</varname> (string)</title>
		<para>
		Set the value of a shared variable ($shv(name)). The parameter
		can be set many times.
		</para>
		<para>
		The value of the parameter has the format:
		_name_ '=' _type_ ':' _value_
		</para>
		<itemizedlist>
			<listitem><para>_name_: shared variable name</para></listitem>
			
			<listitem><para>_type_: type of the value</para>
			 <itemizedlist>
	    <listitem><para> <quote>i</quote>: integer value </para></listitem> 
		<listitem><para> <quote>s</quote>: string value </para></listitem>	
		      </itemizedlist>
			</listitem>	  

			<listitem><para>_value_: value to be set</para></listitem>
		</itemizedlist>
		<para>
		Default value is <quote>NULL</quote>.
		</para>
		<example>
		<title><varname>shvset</varname> parameter usage</title>
		<programlisting format="linespecific">
...
modparam("pv", "shvset", "debug=i:1")
modparam("pv", "shvset", "pstngw=s:sip:10.10.10.10")
...
</programlisting>
	    </example>
	</section>
	<section>
		<title><varname>varset</varname> (string)</title>
		<para>
		Set the value of a script variable ($var(name)). The parameter
		can be set many times.
		</para>
		<para>
		The value of the parameter has the format:
		_name_ '=' _type_ ':' _value_
		</para>
		<itemizedlist>
			<listitem><para>_name_: shared variable name</para></listitem>
			
			<listitem><para>_type_: type of the value</para>
			 <itemizedlist>
	     <listitem><para> <quote>i</quote>: integer value </para></listitem> 
		 <listitem><para> <quote>s</quote>: string value </para></listitem>	
			 </itemizedlist>
			</listitem>	  

			<listitem><para>_value_: value to be set</para></listitem>
		</itemizedlist>
		<para>
		Default value is <quote>NULL</quote>.
		</para>
		<example>
		<title><varname>varset</varname> parameter usage</title>
		<programlisting format="linespecific">
...
modparam("pv", "varset", "init=i:1")
modparam("pv", "varset", "gw=s:sip:11.11.11.11;transport=tcp")
...
</programlisting>
	    </example>
	</section>
		<section>
			<title><varname>avp_aliases</varname> (string)</title>
			<para>
			Define aliases for PV AVP names.
			</para>
			<para>
				<emphasis>
					Default value is NULL.
				</emphasis>
			</para>
			<example>
				<title><varname>avp_aliases</varname> parameter usage</title>
				<programlisting format="linespecific">
...
modparam("pv","avp_aliases","email=s:email_addr;tmp=i:100")
...
				</programlisting>
			</example>
		</section>
	</section>
	<section>
	<title>Functions</title>
		<section>
		<title><function moreinfo="none">pv_isset(pvar)</function></title>
		<para>
			Return true if a PV value is different than 'null'.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para>
				<emphasis>pvar</emphasis> - pvar identifier.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>pv_isset</function> usage</title>
		<programlisting format="linespecific">
...
if(pv_isset("$avp("s:x")"))
{
    ...
}
...
</programlisting>
		</example>
		</section>
		<section>
		<title><function moreinfo="none">pv_unset(pvar)</function></title>
		<para>
			Unset the value of the PV (e.g., delete AVP, set to null).
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para>
				<emphasis>pvar</emphasis> - pvar identifier.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>pv_unset</function> usage</title>
		<programlisting format="linespecific">
...
pv_unset("$avp("s:x")");
...
</programlisting>
		</example>
		</section>
		<section>
			<title>
				<function moreinfo="none">is_int(pvar)</function>
			</title>
			<para>
			Function checks if pvar argument contains integer value
			and returns 1 if it does and -1 otherwise.
			</para>
			<para>
			Function can be used from all kinds of routes.
			</para>
			<example>
				<title><function>is_int()</function> usage</title>
				<programlisting format="linespecific">
...
if (is_int("$var(foo)")) {
    xlog("L_INFO", "variable foo contains integer value\n");
}
...
				</programlisting>
			</example>
		</section>
		<section>
			<title>
				<function moreinfo="none">typeof(pvar, vtype)</function>
			</title>
			<para>
			Returns true if the type of pseudo-variable matches the second
			parameter. The second parameter can be: 'int' - type is integer;
			'str' - type is string; 'null' - type is null.
			</para>
			<para>
			Function can be used from ANYROUTE.
			</para>
			<example>
				<title><function>typeof()</function> usage</title>
				<programlisting format="linespecific">
...
if (typeof("$var(foo)", "str")) {
    xdbg("variable foo is a string\n");
}
...
				</programlisting>
			</example>
		</section>
		<section>
			<title>
				<function moreinfo="none">not_empty(pvar)</function>
			</title>
			<para>
			Returns true if the pseudo-variables has the type string and
			is not empty value.
			</para>
			<para>
			Function can be used from all kinds of routes.
			</para>
			<example>
				<title><function>not_empty()</function> usage</title>
				<programlisting format="linespecific">
...
if (not_empty("$var(foo)")) {
    append_hf("X-Foo: $var(foo)\r\n");
}
...
				</programlisting>
			</example>
		</section>
	</section>

	<section>
		<title><acronym>MI</acronym> Commands</title>
		<section>
			<title><function moreinfo="none">shv_set</function></title>
			<para>
				Set the value of a shared variable ($shv(name)).
			</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>_name_: shared variable name</para></listitem>
			
			<listitem><para>_type_: type of the value</para>
			      <itemizedlist>
	    <listitem><para> <quote>int</quote>: integer value </para></listitem> 
		<listitem><para> <quote>str</quote>: string value </para></listitem>	
				  </itemizedlist>
			</listitem>	  

			<listitem><para>_value_: value to be set</para></listitem>
		</itemizedlist>
		<para>
		MI FIFO Command Format:
		</para>
        <programlisting  format="linespecific">
		:shv_set:_reply_fifo_file_
		_name_
		_type_
		_value_
		_empty_line_
		</programlisting>
			<example>
			<title><function moreinfo="none">shv_set</function> usage</title>
			<programlisting format="linespecific">
...
$ &ctltool; fifo shv_set debug int 0
...
</programlisting>
			</example>
		</section>
		<section>
			<title><function moreinfo="none">shv_get</function></title>
			<para>
				Get the value of a shared variable ($shv(name)).
			</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>_name_: shared variable name. If this parameter
			is missing, all shared variables are returned.</para></listitem>
		</itemizedlist>
		<para>
		MI FIFO Command Format:
		</para>
        <programlisting  format="linespecific">
		:shv_get:_reply_fifo_file_
		_name_
		_empty_line_
		</programlisting>
			<example>
			<title><function moreinfo="none">shv_get</function> usage</title>
			<programlisting format="linespecific">
...
$ &ctltool; fifo shv_get debug
$ &ctltool; fifo shv_get
...
</programlisting>
			</example>
		</section>
	</section>
</chapter>

