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Diffstat (limited to 'man/sd_bus_message_append_basic.xml')
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diff --git a/man/sd_bus_message_append_basic.xml b/man/sd_bus_message_append_basic.xml new file mode 100644 index 0000000..abd3bae --- /dev/null +++ b/man/sd_bus_message_append_basic.xml @@ -0,0 +1,264 @@ +<?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_append_basic" xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>sd_bus_message_append_basic</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_message_append_basic</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_message_append_basic</refname> + + <refpurpose>Attach a single field to a message</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int sd_bus_message_append_basic</funcdef> + <paramdef>sd_bus_message *<parameter>m</parameter></paramdef> + <paramdef>char <parameter>type</parameter></paramdef> + <paramdef>const void *<parameter>p</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_bus_message_append_basic()</function> appends a + single field to the message <parameter>m</parameter>. The + parameter <parameter>type</parameter> determines how the pointer + <parameter>p</parameter> is interpreted. + <parameter>type</parameter> must be one of the basic types as + defined by the <ulink + url="http://dbus.freedesktop.org/doc/dbus-specification.html#basic-types">Basic + Types</ulink> section of the D-Bus specification, and listed in + the table below. + </para> + + <table id='format-specifiers'> + <title>Item type specifiers</title> + + <tgroup cols='5'> + <colspec colname='specifier' /> + <colspec colname='constant' /> + <colspec colname='description' /> + <colspec colname='size' /> + <colspec colname='ctype' /> + <thead> + <row> + <entry>Specifier</entry> + <entry>Constant</entry> + <entry>Description</entry> + <entry>Size</entry> + <entry>Expected C Type</entry> + </row> + </thead> + <tbody> + <row> + <entry><literal>y</literal></entry> + <entry><constant>SD_BUS_TYPE_BYTE</constant></entry> + <entry>unsigned integer</entry> + <entry>1 byte</entry> + <entry>uint8_t</entry> + </row> + + <row> + <entry><literal>b</literal></entry> + <entry><constant>SD_BUS_TYPE_BOOLEAN</constant></entry> + <entry>boolean</entry> + <entry>4 bytes</entry> + <entry>int</entry> + </row> + + <row> + <entry><literal>n</literal></entry> + <entry><constant>SD_BUS_TYPE_INT16</constant></entry> + <entry>signed integer</entry> + <entry>2 bytes</entry> + <entry>int16_t</entry> + </row> + + <row> + <entry><literal>q</literal></entry> + <entry><constant>SD_BUS_TYPE_UINT16</constant></entry> + <entry>unsigned integer</entry> + <entry>2 bytes</entry> + <entry>uint16_t</entry> + </row> + + <row> + <entry><literal>i</literal></entry> + <entry><constant>SD_BUS_TYPE_INT32</constant></entry> + <entry>signed integer</entry> + <entry>4 bytes</entry> + <entry>int32_t</entry> + </row> + + <row> + <entry><literal>u</literal></entry> + <entry><constant>SD_BUS_TYPE_UINT32</constant></entry> + <entry>unsigned integer</entry> + <entry>4 bytes</entry> + <entry>uint32_t</entry> + </row> + + <row> + <entry><literal>x</literal></entry> + <entry><constant>SD_BUS_TYPE_INT64</constant></entry> + <entry>signed integer</entry> + <entry>8 bytes</entry> + <entry>int64_t</entry> + </row> + + <row> + <entry><literal>t</literal></entry> + <entry><constant>SD_BUS_TYPE_UINT64</constant></entry> + <entry>unsigned integer</entry> + <entry>8 bytes</entry> + <entry>uint64_t</entry> + </row> + + <row> + <entry><literal>d</literal></entry> + <entry><constant>SD_BUS_TYPE_DOUBLE</constant></entry> + <entry>floating-point</entry> + <entry>8 bytes</entry> + <entry>double</entry> + </row> + + <row> + <entry><literal>s</literal></entry> + <entry><constant>SD_BUS_TYPE_STRING</constant></entry> + <entry>Unicode string</entry> + <entry>variable</entry> + <entry>char[]</entry> + </row> + + <row> + <entry><literal>o</literal></entry> + <entry><constant>SD_BUS_TYPE_OBJECT_PATH</constant></entry> + <entry>object path</entry> + <entry>variable</entry> + <entry>char[]</entry> + </row> + + <row> + <entry><literal>g</literal></entry> + <entry><constant>SD_BUS_TYPE_SIGNATURE</constant></entry> + <entry>signature</entry> + <entry>variable</entry> + <entry>char[]</entry> + </row> + + <row> + <entry><literal>h</literal></entry> + <entry><constant>SD_BUS_TYPE_UNIX_FD</constant></entry> + <entry>UNIX file descriptor</entry> + <entry>4 bytes</entry> + <entry>int</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>The value of the parameter is copied into a memory area held + by the message object, stays in the possession of the caller and + may hence be freely changed after this call without affecting the + bus message it has been added to. If <parameter>type</parameter> + is <literal>h</literal> (UNIX file descriptor), the descriptor is + duplicated by this call and the passed descriptor stays in + possession of the caller.</para> + + <para>For types <literal>s</literal>, <literal>o</literal>, and + <literal>g</literal>, the parameter <parameter>p</parameter> is + interpreted as a pointer to a <constant>NUL</constant>-terminated + character sequence. As a special case, a <constant>NULL</constant> + pointer is interpreted as an empty string. The string should be + valid Unicode string encoded as UTF-8. In case of the two latter + types, the additional requirements for a D-Bus object path or + type signature should be satisfied. Those requirements should be + verified by the recipient of the message. + </para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, this call 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 parameter is invalid. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EPERM</constant></term> + + <listitem><para>Message has been sealed. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ESTALE</constant></term> + + <listitem><para>Message is in invalid state. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENXIO</constant></term> + + <listitem><para>Message cannot be appended to. + </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_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html">The D-Bus specification</ulink> + </para> + </refsect1> + +</refentry> |