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

<chapter>

	<title>&develguide;</title>
	<section>
	<title>Available Functions</title>
	<section>
		<title>
		<function moreinfo="none">ul_register_domain(name)</function>
		</title>
		<para>
		The function registers a new domain. Domain is just another name for
		table used in registrar. The function is called from fixups in
		registrar. It gets name of the domain as a parameter and returns
		pointer to a new domain structure. The fixup than 'fixes' the
		parameter in registrar so that it will pass the pointer instead of the
		name every time save() or lookup() is called. Some usrloc functions
		get the pointer as parameter when called. For more details see
		implementation of save function in registrar.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>const char* name</emphasis> - Name of the domain
				(also called table) to be registered.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_insert_urecord(domain, aor, rec)</function>
		</title>
		<para>
		The function creates a new record structure and inserts it in the
		specified domain. The record is structure that contains all the
		contacts for belonging to the specified username.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>udomain_t* domain</emphasis> - Pointer to domain
				returned by ul_register_udomain.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>str* aor</emphasis> - Address of Record (aka
			username) of the new record (at this time the record will
			contain no contacts yet).
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>urecord_t** rec</emphasis> - The newly created
			record structure.
			</para>
		</listitem>
		</itemizedlist>
	</section>


	<section>
		<title>
		<function moreinfo="none">ul_delete_urecord(domain, aor)</function>
		</title>
		<para>
		The function deletes all the contacts bound with the given Address
		Of Record.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>udomain_t* domain</emphasis> - Pointer to domain
			returned by ul_register_udomain.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>str* aor</emphasis> - Address of record (aka
			username) of the record, that should be deleted.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_delete_urecord_by_ruid(domain, ruid)</function>
		</title>
		<para>
		The function deletes from given domain a contact with
		given ruid.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>udomain_t* domain</emphasis> - Pointer
			to domain returned by ul_register_udomain.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>str* ruid</emphasis> - ruid of contact
			that should be deleted.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_get_urecord(domain, aor)</function>
		</title>
		<para>
		The function returns pointer to record with given Address of Record.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>udomain_t* domain</emphasis> - Pointer to domain
			returned by ul_register_udomain.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>str* aor</emphasis> - Address of Record of request
			record.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_lock_udomain(domain)</function>
		</title>
		<para>
		The function lock the specified domain, it means, that no other
		processes will be able to access during the time. This prevents race
		conditions. Scope of the lock is the specified domain, that means,
		that multiple domain can be accessed simultaneously, they don't block
		each other.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>udomain_t* domain</emphasis> - Domain to be locked.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_unlock_udomain(domain)</function>
		</title>
		<para>
		Unlock the specified domain previously locked by ul_lock_udomain.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>udomain_t* domain</emphasis> - Domain to be
			unlocked.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_release_urecord(record)</function>
		</title>
		<para>
		Do some sanity checks - if all contacts have been removed, delete
		the entire record structure.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>urecord_t* record</emphasis> - Record to be
			released.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_insert_ucontact(record, contact,
		expires, q, callid, cseq, flags, cont, ua, sock)</function>
		</title>
		<para>
		The function inserts a new contact in the given record with
		specified parameters.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>urecord_t* record</emphasis> - Record in which
			the contact should be inserted.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>str* contact</emphasis> - Contact &uri;.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>time_t expires</emphasis> - Expires of the
			contact in absolute value.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>float q</emphasis> - q value of the contact.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>str* callid</emphasis> - Call-ID of the REGISTER
			message that contained the contact.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>int cseq</emphasis> - CSeq of the REGISTER
			message that contained the contact.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>unsigned int flags</emphasis> - Flags to be set.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>ucontact_t* cont</emphasis> - Pointer to newly
			created structure.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>str* ua</emphasis> - User-Agent of the REGISTER
			message that contained the contact.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>struct socket_info *sock</emphasis> - socket on
			which the REGISTER message was received on.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_delete_ucontact
			(record, contact)</function>
		</title>
		<para>
		The function deletes given contact from record.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>urecord_t* record</emphasis> - Record from which
			the contact should be removed.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>ucontact_t* contact</emphasis> - Contact to be
			deleted.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_get_ucontact(record, contact)</function>
		</title>
		<para>
		The function tries to find contact with given Contact &uri; and
		returns pointer to structure representing the contact.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>urecord_t* record</emphasis> - Record to be
			searched for the contact.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>str_t* contact</emphasis> - &uri; of the request
			contact.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_get_all_ucontacts
			(buf, len, flags)</function>
		</title>
		<para>
		The function retrieves all contacts of all registered users and
		returns them in the caller-supplied buffer. If the buffer is too small,
		the function returns positive value indicating how much additional
		space would be necessary to accommodate all of them. Please note
		that the positive return value should be used only as a
		<quote>hint</quote>, as there is no guarantee that during the time
		between two subsequent calls number of registered contacts will
		remain the same.
		</para>
		<para>
		If flag parameter is set to non-zero value then only contacts that
		have the specified flags set will be returned. It is, for example,
		possible to list only contacts that are behind NAT.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>void* buf</emphasis> - Buffer for returning
			contacts.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>int len</emphasis> - Length of the buffer.
			</para>
		</listitem>
		</itemizedlist>
		<itemizedlist>
		<listitem>
			<para><emphasis>unsigned int flags</emphasis> - Flags that must
			be set.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_update_ucontact(contact, expires, q,
		callid, cseq, set, res, ua, sock)</function>
		</title>
		<para>
		The function updates contact with new values.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>ucontact_t* contact</emphasis> - Contact &uri;.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>time_t expires</emphasis> - Expires of the
			contact in absolute value.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>float q</emphasis> - q value of the contact.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>str* callid</emphasis> - Call-ID of the REGISTER
			message that contained the contact.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>int cseq</emphasis> - CSeq of the REGISTER message
			that contained the contact.
			</para>
		</listitem>
		<listitem>
			<para>
			<emphasis>unsigned int set</emphasis> - OR value of flags to
			be set.
			</para>
		</listitem>
		<listitem>
			<para>
			<emphasis>unsigned int res</emphasis> - OR value of flags to be
			reset.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>str* ua</emphasis> - User-Agent of the REGISTER
			message that contained the contact.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>struct socket_info *sock</emphasis> - socket on
			which the REGISTER message was received on.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_bind_ursloc(api)
			</function>
		</title>
		<para>
		The function imports all functions that are exported by the
		USRLOC module. Overs for other modules which want to user the
		internal USRLOC API an easy way to load and access the functions.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>usrloc_api_t* api</emphasis> - USRLOC API
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_register_ulcb(type, callback, param)
			</function>
		</title>
		<para>
		The function register with USRLOC a callback function to be called
		when some event occurs inside USRLOC.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>int types</emphasis> - type of event for which
			the callback should be called (see usrloc/ul_callback.h).
			</para>
		</listitem>
		<listitem>
			<para><emphasis>ul_cb f</emphasis> - callback function; see
			usrloc/ul_callback.h for prototype.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>void *param</emphasis> - some parameter to be
			passed to the callback each time when it is called.
			</para>
		</listitem>
		</itemizedlist>
	</section>

	<section>
		<title>
		<function moreinfo="none">ul_get_num_users()
			</function>
		</title>
		<para>
		The function loops through all domains summing up the number of users.
		</para>
	</section>

	</section>

</chapter>

