mirror of
https://github.com/systemd/systemd
synced 2024-07-22 02:34:54 +00:00
12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
279 lines
9 KiB
XML
279 lines
9 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_bus_message_append_basic">
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<refentryinfo>
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<title>sd_bus_message_append_basic</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>A monkey with a typewriter</contrib>
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<firstname>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_message_append_basic</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_message_append_basic</refname>
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<refpurpose>Attach a single part to a message</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int sd_bus_message_append_basic</funcdef>
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<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
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<paramdef>char <parameter>type</parameter></paramdef>
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<paramdef>char void *<parameter>p</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_bus_message_append_basic</function> appends a
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single item to the message <parameter>m</parameter>. Parameter
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<parameter>type</parameter> determines how pointer
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<parameter>p</parameter> is interpreted.
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<parameter>type</parameter> must be one of the basic types
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as defined by the
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<ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html#basic-types">Basic Types</ulink>
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section of the D-Bus specification, and listed in the table below.
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</para>
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<table id='format-specifiers'>
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<title>Item format specifiers</title>
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<tgroup cols='4'>
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<colspec colname='specifier' />
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<colspec colname='constant' />
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<colspec colname='description' />
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<colspec colname='size' />
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<thead>
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<row>
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<entry>Specifier</entry>
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<entry>Constant</entry>
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<entry>Description</entry>
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<entry>Size</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><literal>y</literal></entry>
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<entry><constant>SD_BUS_TYPE_BYTE</constant></entry>
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<entry>unsigned integer</entry>
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<entry>1 byte</entry>
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</row>
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<row>
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<entry><literal>b</literal></entry>
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<entry><constant>SD_BUS_TYPE_BOOLEAN</constant></entry>
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<entry>boolean</entry>
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<entry>4 bytes</entry>
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</row>
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<row>
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<entry><literal>n</literal></entry>
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<entry><constant>SD_BUS_TYPE_INT16</constant></entry>
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<entry>signed integer</entry>
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<entry>2 bytes</entry>
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</row>
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<row>
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<entry><literal>q</literal></entry>
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<entry><constant>SD_BUS_TYPE_UINT16</constant></entry>
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<entry>unsigned integer</entry>
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<entry>2 bytes</entry>
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</row>
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<row>
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<entry><literal>i</literal></entry>
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<entry><constant>SD_BUS_TYPE_INT32</constant></entry>
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<entry>signed integer</entry>
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<entry>4 bytes</entry>
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</row>
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<row>
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<entry><literal>u</literal></entry>
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<entry><constant>SD_BUS_TYPE_UINT32</constant></entry>
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<entry>unsigned integer</entry>
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<entry>4 bytes</entry>
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</row>
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<row>
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<entry><literal>x</literal></entry>
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<entry><constant>SD_BUS_TYPE_INT64</constant></entry>
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<entry>signed integer</entry>
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<entry>8 bytes</entry>
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</row>
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<row>
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<entry><literal>t</literal></entry>
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<entry><constant>SD_BUS_TYPE_UINT64</constant></entry>
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<entry>unsigned integer</entry>
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<entry>8 bytes</entry>
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</row>
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<row>
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<entry><literal>d</literal></entry>
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<entry><constant>SD_BUS_TYPE_DOUBLE</constant></entry>
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<entry>floating-point</entry>
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<entry>8 bytes</entry>
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</row>
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<row>
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<entry><literal>s</literal></entry>
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<entry><constant>SD_BUS_TYPE_STRING</constant></entry>
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<entry>Unicode string</entry>
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<entry>variable</entry>
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</row>
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<row>
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<entry><literal>o</literal></entry>
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<entry><constant>SD_BUS_TYPE_OBJECT_PATH</constant></entry>
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<entry>object path</entry>
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<entry>variable</entry>
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</row>
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<row>
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<entry><literal>g</literal></entry>
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<entry><constant>SD_BUS_TYPE_SIGNATURE</constant></entry>
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<entry>signature</entry>
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<entry>variable</entry>
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</row>
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<row>
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<entry><literal>h</literal></entry>
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<entry><constant>SD_BUS_TYPE_UNIX_FD</constant></entry>
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<entry>UNIX file descriptor</entry>
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<entry>4 bytes</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>The value of the parameter is copied into the memory area
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containing the message and may be changed after this call. If
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<parameter>type</parameter> is <literal>h</literal> (UNIX file
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descriptor), it is always "consumed" by this call, and either
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successfully appended to the message or closed.</para>
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<para>For types <literal>s</literal>, <literal>o</literal>, and
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<literal>g</literal>, the parameter <parameter>p</parameter> is
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interpreted as a pointer to a <constant>NUL</constant>-terminated
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character sequence. As a special case, a <constant>NULL</constant>
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pointer is interpreted as an empty string. The string should be
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valid Unicode string encoded as UTF-8. In case of the two latter
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types, the additional requirements for a D-Bus object path or
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type signature should be satisfied. Those requirements should be
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verified by the recipient of the message.
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</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, this call returns 0 or a positive integer. On
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failure, it returns a negative errno-style error code.</para>
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</refsect1>
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<refsect1 id='errors'>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>Specified parameter is invalid.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EPERM</constant></term>
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<listitem><para>Message has been sealed.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ESTALE</constant></term>
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<listitem><para>Message is in invalid state.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENXIO</constant></term>
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<listitem><para>Message cannot be appended to.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_bus_append_basic()</function> function
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described here is available as a shared library, which can be
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compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html">The D-Bus specification</ulink>
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</para>
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</refsect1>
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</refentry>
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