Merge pull request #9919 from keszybz/more-sd-bus-doc

Some more sd-bus docs

7 files changed, 339 insertions, 1 deletions

diff --git a/man/rules/meson.build b/man/rules/meson.build
index 2edf2c21c2..99915c5e9f 100644
--- a/man/rules/meson.build
+++ b/man/rules/meson.build
@@ -213,6 +213,10 @@ manpages = [
   '3',
   ['sd_bus_message_get_realtime_usec', 'sd_bus_message_get_seqnum'],
   ''],
+ ['sd_bus_message_get_signature',
+  '3',
+  ['sd_bus_message_has_signature', 'sd_bus_message_is_empty'],
+  ''],
  ['sd_bus_message_get_type',
   '3',
   ['sd_bus_message_is_method_call',
@@ -242,6 +246,7 @@ manpages = [
   ''],
  ['sd_bus_message_new_signal', '3', [], ''],
  ['sd_bus_message_read', '3', ['sd_bus_message_readv'], ''],
+ ['sd_bus_message_read_array', '3', [], ''],
  ['sd_bus_message_read_basic', '3', [], ''],
  ['sd_bus_message_rewind', '3', [], ''],
  ['sd_bus_message_set_destination',
@@ -259,6 +264,7 @@ manpages = [
    'sd_bus_message_get_expect_reply',
    'sd_bus_message_set_auto_start'],
   ''],
+ ['sd_bus_message_skip', '3', [], ''],
  ['sd_bus_message_verify_type', '3', [], ''],
  ['sd_bus_negotiate_fds',
   '3',
diff --git a/man/sd-bus.xml b/man/sd-bus.xml
index 3daafc4495..bf2f37a86d 100644
--- a/man/sd-bus.xml
+++ b/man/sd-bus.xml
@@ -60,16 +60,19 @@
 <citerefentry><refentrytitle>sd_bus_message_copy</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_get_cookie</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_get_monotonic_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+<citerefentry><refentrytitle>sd_bus_message_get_signature</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_get_type</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_new_method_call</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_new_method_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_new_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-<citerefentry><refentrytitle>sd_bus_message_read_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_read</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+<citerefentry><refentrytitle>sd_bus_message_read_array</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+<citerefentry><refentrytitle>sd_bus_message_read_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_rewind</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_set_destination</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_set_expect_reply</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+<citerefentry><refentrytitle>sd_bus_message_skip</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_message_verify_type</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_negotiate_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
diff --git a/man/sd_bus_message_get_signature.xml b/man/sd_bus_message_get_signature.xml
new file mode 100644
index 0000000000..bee6778190
--- /dev/null
+++ b/man/sd_bus_message_get_signature.xml
@@ -0,0 +1,111 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
+
+<refentry id="sd_bus_message_get_signature" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <refentryinfo>
+    <title>sd_bus_message_get_signature</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd_bus_message_get_signature</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_bus_message_get_signature</refname>
+    <refname>sd_bus_message_is_empty</refname>
+    <refname>sd_bus_message_has_signature</refname>
+
+    <refpurpose>Query bus message signature</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>const char* <function>sd_bus_message_get_signature</function></funcdef>
+        <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+        <paramdef>int <parameter>complete</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_message_is_empty</function></funcdef>
+        <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_message_has_signature</function></funcdef>
+        <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+        <paramdef>const char *<parameter>signature</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><function>sd_bus_message_get_signature()</function> returns the signature of message
+    <parameter>message</parameter>. If <parameter>complete</parameter> is true, the signature of the
+    whole message is returned, and just the signature of the currently open container otherwise.
+    </para>
+
+    <para><function>sd_bus_message_is_empty()</function> returns true if the message is empty,
+    i.e. when its signature is empty.</para>
+
+    <para><function>sd_bus_message_has_signature()</function> returns true if the signature of the
+    message <parameter>message</parameter> matches given <parameter>signature</parameter>. Parameter
+    <parameter>signature</parameter> may be <constant>NULL</constant>, this is treated the same as
+    an empty string, which is equivalent to calling <function>sd_bus_message_is_empty()</function>.
+    </para>
+</refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>On success, <function>sd_bus_message_get_signature()</function> returns
+    the signature, and <constant>NULL</constant> on error.</para>
+
+    <para>The other functions return 0 or a positive integer on success. On failure, they return a
+    negative errno-style error code.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Errors</title>
+
+    <para>Returned errors may indicate the following problems:</para>
+
+    <variablelist>
+      <varlistentry>
+        <term><constant>-EINVAL</constant></term>
+
+        <listitem><para>The <parameter>message</parameter> parameter is <constant>NULL</constant>.
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>NULL</constant></term>
+
+        <listitem><para>The <parameter>message</parameter> parameter is <constant>NULL</constant>.
+        </para></listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <xi:include href="libsystemd-pkgconfig.xml" />
+
+  <refsect1>
+    <title>See Also</title>
+
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_message_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>
diff --git a/man/sd_bus_message_read.xml b/man/sd_bus_message_read.xml
index c86f55fb54..2815c01986 100644
--- a/man/sd_bus_message_read.xml
+++ b/man/sd_bus_message_read.xml
@@ -224,6 +224,7 @@ sd_bus_message_read(m, "a{is}", 3, &amp;i, &amp;s, &amp;j, &amp;t, &amp;k, &amp;
       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd_bus_message_read_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_message_skip</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>3</manvolnum></citerefentry>
     </para>
   </refsect1>
diff --git a/man/sd_bus_message_read_array.xml b/man/sd_bus_message_read_array.xml
new file mode 100644
index 0000000000..31481272bb
--- /dev/null
+++ b/man/sd_bus_message_read_array.xml
@@ -0,0 +1,108 @@
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
+
+<refentry id="sd_bus_message_read_array">
+
+  <refentryinfo>
+    <title>sd_bus_message_read_array</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd_bus_message_read_array</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_bus_message_read_array</refname>
+
+    <refpurpose>Access an array of elements in a message</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_message_read_array</function></funcdef>
+        <paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
+        <paramdef>char <parameter>type</parameter></paramdef>
+        <paramdef>const void **<parameter>ptr</parameter></paramdef>
+        <paramdef>size_t *<parameter>size</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><function>sd_bus_message_read_array()</function> gives access to an element array in
+    message <parameter>m</parameter>. The "read pointer" in the message must be right before an
+    array of type <parameter>type</parameter>. As a special case, <parameter>type</parameter> may be
+    <constant>NUL</constant>, in which case any type is acceptable. A pointer to the array data is
+    returned in the parameter <parameter>ptr</parameter> and the size of array data (in bytes) is
+    returned in the parameter <parameter>size</parameter>. If <parameter>size</parameter> is 0, a
+    valid non-null pointer will be returned, but it may not be dereferenced. The data is aligned as
+    appropriate for the data type. The data is part of the message — it may not be modified and is
+    valid only as long as the message is referenced. After this function returns, the "read pointer"
+    points at the next element after the array.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>
+      On success, <function>sd_bus_message_read_array()</function> returns 0 or
+      a positive integer. On failure, it returns a negative errno-style error
+      code.
+    </para>
+  </refsect1>
+
+  <refsect1 id='errors'>
+    <title>Errors</title>
+
+    <para>Returned errors may indicate the following problems:</para>
+
+    <variablelist>
+      <varlistentry>
+        <term><constant>-EINVAL</constant></term>
+
+        <listitem><para>Specified type is invalid or the message parameter or one of the output
+        parameters are <constant>NULL</constant>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-EOPNOTSUPP</constant></term>
+
+        <listitem><para>The byte order in the message is different than native byte
+        order.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-EPERM</constant></term>
+
+        <listitem><para>The message is not sealed.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-EBADMSG</constant></term>
+
+        <listitem><para>The message cannot be parsed.</para></listitem>
+      </varlistentry>
+
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_message_read</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>
diff --git a/man/sd_bus_message_read_basic.xml b/man/sd_bus_message_read_basic.xml
index e39cfd5bd6..774d3fcf87 100644
--- a/man/sd_bus_message_read_basic.xml
+++ b/man/sd_bus_message_read_basic.xml
@@ -227,6 +227,7 @@
       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_message_skip</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd_bus_message_read</refentrytitle><manvolnum>3</manvolnum></citerefentry>
     </para>
   </refsect1>
diff --git a/man/sd_bus_message_skip.xml b/man/sd_bus_message_skip.xml
new file mode 100644
index 0000000000..384a791494
--- /dev/null
+++ b/man/sd_bus_message_skip.xml
@@ -0,0 +1,108 @@
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
+
+<refentry id="sd_bus_message_skip" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <refentryinfo>
+    <title>sd_bus_message_skip</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd_bus_message_skip</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_bus_message_skip</refname>
+
+    <refpurpose>Skip elements in a bus message</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_message_skip</function></funcdef>
+        <paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
+        <paramdef>const char* <parameter>types</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><function>sd_bus_message_skip()</function> is somewhat similar to
+    <citerefentry><refentrytitle>sd_bus_message_read</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+    but instead of reading the contents of the message, it only moves the "read pointer". Subsequent
+    read operations will read the elements that are after the elements that were skipped.</para>
+
+    <para>The <parameter>types</parameter> argument has the same meaning as in
+    <function>sd_bus_message_read()</function>. It may also be <constant>NULL</constant>, to skip a
+    single element of any type.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>On success, <function>sd_bus_message_skip()</function> returns 0 or a positive integer. On
+    failure, it returns a negative errno-style error code.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Errors</title>
+
+    <para>Returned errors may indicate the following problems:</para>
+
+    <variablelist>
+      <varlistentry>
+        <term><constant>-EINVAL</constant></term>
+
+        <listitem><para>The <parameter>m</parameter> parameter is
+        <constant>NULL</constant>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-EBADMSG</constant></term>
+
+        <listitem><para>The message cannot be parsed.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-EPERM</constant></term>
+
+        <listitem><para>The message is not sealed.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-ENXIO</constant></term>
+
+        <listitem><para>The message end has been reached and the requested elements cannot be read.
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><constant>-ENOMEM</constant></term>
+
+        <listitem><para>Memory allocation failed.</para></listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <xi:include href="libsystemd-pkgconfig.xml" />
+
+  <refsect1>
+    <title>See Also</title>
+
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_message_read</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_message_read_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>