Merge pull request #15405 from DaanDeMeyer/sd-bus-can-send-docs

Add sd_bus_can_send docs

5 files changed, 131 insertions, 23 deletions

diff --git a/man/rules/meson.build b/man/rules/meson.build
index 386ca629fd..0df4a889a7 100644
--- a/man/rules/meson.build
+++ b/man/rules/meson.build
@@ -146,6 +146,7 @@ manpages = [
    'sd_bus_call_method_asyncv',
    'sd_bus_call_methodv'],
   ''],
+ ['sd_bus_can_send', '3', [], ''],
  ['sd_bus_close', '3', ['sd_bus_default_flush_close', 'sd_bus_flush'], ''],
  ['sd_bus_creds_get_pid',
   '3',
diff --git a/man/sd-bus.xml b/man/sd-bus.xml
index c70e9e1787..8c05e33512 100644
--- a/man/sd-bus.xml
+++ b/man/sd-bus.xml
@@ -50,6 +50,7 @@
 <citerefentry><refentrytitle>sd_bus_call_async</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_call_method</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_call_method_async</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+<citerefentry><refentrytitle>sd_bus_can_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 <citerefentry><refentrytitle>sd_bus_close</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
diff --git a/man/sd_bus_can_send.xml b/man/sd_bus_can_send.xml
new file mode 100644
index 0000000000..ba2a180ee2
--- /dev/null
+++ b/man/sd_bus_can_send.xml
@@ -0,0 +1,93 @@
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
+
+<refentry id="sd_bus_can_send"
+          xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>sd_bus_can_send</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd_bus_can_send</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_bus_can_send</refname>
+
+    <refpurpose>Check which types can be sent over a bus object</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>void <function>sd_bus_can_send</function></funcdef>
+        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+        <paramdef>char <parameter>type</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><function>sd_bus_can_send</function> is mostly used for checking if file descriptor
+    passing is available on the given bus. <parameter>type</parameter> can be any of the
+    <constant>SD_BUS_TYPE</constant> constants.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>On failure, <function>sd_bus_can_send()</function> returns a negative errno-style error
+    code. If values of the given type can be sent over the given bus, it returns a positive integer.
+    Otherwise, it returns zero.</para>
+
+    <refsect2>
+      <title>Errors</title>
+
+      <para>Returned errors may indicate the following problems:</para>
+
+      <variablelist>
+        <varlistentry>
+          <term><constant>-ENOPKG</constant></term>
+
+          <listitem><para>The bus object <parameter>bus</parameter> could not be resolved.</para>
+          </listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><constant>-ENOTCONN</constant></term>
+
+          <listitem><para>The input parameter <parameter>bus</parameter> is
+          <constant>NULL</constant> or the bus is not connected.</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><constant>-ECHILD</constant></term>
+
+          <listitem><para>The bus object <parameter>bus</parameter> was created in a different
+          process.</para></listitem>
+        </varlistentry>
+      </variablelist>
+    </refsect2>
+  </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>
+    </para>
+  </refsect1>
+
+</refentry>
diff --git a/man/sd_bus_close.xml b/man/sd_bus_close.xml
index 953f16ac34..8d9bdb4858 100644
--- a/man/sd_bus_close.xml
+++ b/man/sd_bus_close.xml
@@ -48,39 +48,44 @@
   <refsect1>
     <title>Description</title>
 
-    <para><function>sd_bus_close()</function> disconnects the specified bus connection. When this call is invoked and
-    the specified bus object refers to an active connection it is immediately terminated. No further messages may be
-    sent or received on it. Any messages queued in the bus object (both incoming and outgoing) are released. If
-    invoked on <constant>NULL</constant> bus object or when the bus connection is already closed this function executes
-    no operation. This call does not free or unreference the bus object itself. Use
-    <citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry> for that.</para>
-
-    <para><function>sd_bus_flush()</function> synchronously writes out all outgoing queued message on a bus connection
-    if there are any. This function call may block if the peer is not processing bus messages quickly.</para>
+    <para><function>sd_bus_close()</function> disconnects the specified bus connection. When this
+    call is invoked and the specified bus object refers to an active connection it is immediately
+    terminated. No further messages may be sent or received on it. Any messages queued in the bus
+    object (both incoming and outgoing) are released. If invoked on <constant>NULL</constant> bus
+    object or when the bus connection is already closed this function executes no operation. This
+    call does not free or unreference the bus object itself. Use
+    <citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    for that.</para>
+
+    <para><function>sd_bus_flush()</function> synchronously writes out all outgoing queued message
+    on a bus connection if there are any. This function call may block if the peer is not processing
+    bus messages quickly.</para>
 
     <para>Before a program exits it is usually a good idea to flush any pending messages with
-    <function>sd_bus_flush()</function> and then close connections with <function>sd_bus_close()</function> to ensure
-    that no unwritten messages are lost, no further messages may be queued and all incoming but unprocessed messages
-    are released. After both operations have been done, it is a good idea to also drop any remaining references to the
-    bus object so that it may be freed. Since these three operations are frequently done together a helper call
-    <citerefentry><refentrytitle>sd_bus_flush_close_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry> is
-    provided that combines them into one.</para>
+    <function>sd_bus_flush()</function> and then close connections with
+    <function>sd_bus_close()</function> to ensure that no unwritten messages are lost, no further
+    messages may be queued and all incoming but unprocessed messages are released. After both
+    operations have been done, it is a good idea to  also drop any remaining references to the bus
+    object so that it may be freed. Since these three operations are frequently done together a
+    helper call
+    <citerefentry><refentrytitle>sd_bus_flush_close_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    is provided that combines them into one.</para>
 
     <para><function>sd_bus_default_flush_close()</function> is similar to
-    <function>sd_bus_flush_close_unref</function>, but does not take a bus pointer argument and instead
-    iterates over any of the "default" busses opened by
+    <function>sd_bus_flush_close_unref</function>, but does not take a bus pointer argument and
+    instead iterates over any of the "default" busses opened by
     <citerefentry><refentrytitle>sd_bus_default</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
     <citerefentry><refentrytitle>sd_bus_default_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
     <citerefentry><refentrytitle>sd_bus_default_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-    and similar calls. <function>sd_bus_default_flush_close()</function> is particularly useful to clean up
-    any busses opened using those calls before the program exits.</para>
+    and similar calls. <function>sd_bus_default_flush_close()</function> is particularly useful to
+    clean up any busses opened using those calls before the program exits.</para>
   </refsect1>
 
   <refsect1>
     <title>Return Value</title>
 
-    <para>On success, <function>sd_bus_flush()</function> returns 0 or a positive integer. On failure, it returns a
-    negative errno-style error code.</para>
+    <para>On success, <function>sd_bus_flush()</function> returns a non-negative integer. On
+    failure, it returns a negative errno-style error code.</para>
 
     <refsect2>
       <title>Errors</title>
@@ -91,7 +96,8 @@
         <varlistentry>
           <term><constant>-ECHILD</constant></term>
 
-          <listitem><para>The bus connection has been created in a different process.</para></listitem>
+          <listitem><para>The bus connection has been created in a different process.</para>
+          </listitem>
         </varlistentry>
       </variablelist>
     </refsect2>
diff --git a/tools/meson-check-api-docs.sh b/tools/meson-check-api-docs.sh
index c33672934d..2ba5010876 100755
--- a/tools/meson-check-api-docs.sh
+++ b/tools/meson-check-api-docs.sh
@@ -6,7 +6,14 @@ sd_total=0
 udev_good=0
 udev_total=0
 
-for symbol in `nm -g --defined-only "$@" | grep " T " | cut -d" " -f3 | grep -wv sd_bus_try_close | sort -u` ; do
+deprecated="
+    -e sd_bus_try_close
+    -e sd_bus_process_priority
+    -e sd_bus_message_get_priority
+    -e sd_bus_message_set_priority
+"
+
+for symbol in `nm -g --defined-only "$@" | grep " T " | cut -d" " -f3 | grep -wv $deprecated | sort -u` ; do
     if test -f ${MESON_BUILD_ROOT}/man/$symbol.3 ; then
         echo "✓ Symbol $symbol() is documented."
         good=1