sd-bus: Add sd_bus_send_to docs

man/rules/meson.build

@@ -388,7 +388,7 @@ manpages = [
    'sd_bus_release_name_async',
    'sd_bus_request_name_async'],
   ''],
- ['sd_bus_send', '3', [], ''],
+ ['sd_bus_send', '3', ['sd_bus_send_to'], ''],
  ['sd_bus_set_address', '3', ['sd_bus_get_address', 'sd_bus_set_exec'], ''],
  ['sd_bus_set_close_on_exit', '3', ['sd_bus_get_close_on_exit'], ''],
  ['sd_bus_set_connected_signal', '3', ['sd_bus_get_connected_signal'], ''],

man/sd-bus.xml

@@ -138,6 +138,7 @@
 <citerefentry><refentrytitle>sd_bus_reply_method_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_request_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+<citerefentry><refentrytitle>sd_bus_send_to</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_set_address</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_set_allow_interactive_authorization</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_set_bus_client</refentrytitle><manvolnum>3</manvolnum></citerefentry>,

man/sd_bus_send.xml

@@ -18,6 +18,7 @@
 
   <refnamediv>
     <refname>sd_bus_send</refname>
+    <refname>sd_bus_send_to</refname>
 
     <refpurpose>Queue a D-Bus message for transfer</refpurpose>
   </refnamediv>
@@ -32,35 +33,48 @@
         <paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
         <paramdef>uint64_t *<parameter>cookie</parameter></paramdef>
       </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_send_to</function></funcdef>
+        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+        <paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
+        <paramdef>const char *<parameter>destination</parameter></paramdef>
+        <paramdef>uint64_t *<parameter>cookie</parameter></paramdef>
+      </funcprototype>
     </funcsynopsis>
   </refsynopsisdiv>
 
   <refsect1>
     <title>Description</title>
 
-    <para><function>sd_bus_send()</function> queues the bus message object <parameter>m</parameter>
+    <para><function>sd_bus_send()</function> queues the bus message object <parameter>m</parameter> for
-    for transfer. If <parameter>bus</parameter> is <constant>NULL</constant>, the bus that
+    transfer. If <parameter>bus</parameter> is <constant>NULL</constant>, the bus that
-    <parameter>m</parameter> is attached to is used. <parameter>bus</parameter> only needs to be set
+    <parameter>m</parameter> is attached to is used. <parameter>bus</parameter> only needs to be set when the
-    when the message is sent to a different bus than the one it's attached to, for example when
+    message is sent to a different bus than the one it's attached to, for example when forwarding messages.
-    forwarding messages. If the output parameter <parameter>cookie</parameter> is not
+    If the output parameter <parameter>cookie</parameter> is not <constant>NULL</constant>, it is set to the
-    <constant>NULL</constant>, it is set to the message identifier. This value can later be used to
+    message identifier. This value can later be used to match incoming replies to their corresponding
-    match incoming replies to their corresponding messages. If <parameter>cookie</parameter> is set
+    messages. If <parameter>cookie</parameter> is set to <constant>NULL</constant> and the message is not
-    to <constant>NULL</constant> and the message is not sealed, <function>sd_bus_send()</function>
+    sealed, <function>sd_bus_send()</function> assumes the message <parameter>m</parameter> doesn't expect a
-    assumes the message <parameter>m</parameter> doesn't expect a reply and adds the necessary
+    reply and adds the necessary headers to indicate this.</para>
-    headers to indicate this.</para>
 
     <para>Note that in most scenarios, <function>sd_bus_send()</function> should not be called
     directly. Instead, use higher level functions such as
     <citerefentry><refentrytitle>sd_bus_call_method</refentrytitle><manvolnum>3</manvolnum></citerefentry> and
     <citerefentry><refentrytitle>sd_bus_reply_method_return</refentrytitle><manvolnum>3</manvolnum></citerefentry>
     which call <function>sd_bus_send()</function> internally.</para>
+
+    <para><function>sd_bus_send_to()</function> is a shorthand for sending a message to a specific
+    destination. It's main use case is to simplify sending unicast signal messages (signals that only have a
+    single receiver). It's behavior is similar to calling
+    <citerefentry><refentrytitle>sd_bus_message_set_destination</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    followed by calling <function>sd_bus_send()</function>.</para>
   </refsect1>
 
   <refsect1>
     <title>Return Value</title>
 
-    <para>On success, this function returns a non-negative integer. On failure, it returns a
+    <para>On success, these functions return a non-negative integer. On failure, they return a negative
-    negative errno-style error code.</para>
+    errno-style error code.</para>
 
     <refsect2 id='errors'>
       <title>Errors</title>
@@ -85,8 +99,8 @@
         <varlistentry>
           <term><constant>-ECHILD</constant></term>
 
-          <listitem><para>The bus connection was allocated in a parent process and is being reused
+          <listitem><para>The bus connection was allocated in a parent process and is being reused in a child
-          in a child process after <function>fork()</function>.</para></listitem>
+          process after <function>fork()</function>.</para></listitem>
         </varlistentry>
 
         <varlistentry>
@@ -128,8 +142,7 @@
       <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd_bus_call_method</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd_bus_message_set_destination</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-      <citerefentry><refentrytitle>sd_bus_reply_method_return</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_reply_method_return</refentrytitle><manvolnum>3</manvolnum></citerefentry>
-      <citerefentry><refentrytitle>sd_bus_send_to</refentrytitle><manvolnum>3</manvolnum></citerefentry>
     </para>
   </refsect1>