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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
103 lines
3.3 KiB
XML
103 lines
3.3 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2016 Julian Orth
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-->
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<refentry id="sd_bus_message_read_basic">
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<refentryinfo>
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<title>sd_bus_message_read_basic</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<firstname>Julian</firstname>
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<surname>Orth</surname>
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<email>ju.orth@gmail.com</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_read_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_read_basic</refname>
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<refpurpose>Read a basic type from 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 <function>sd_bus_message_read_basic</function></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>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>
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<function>sd_bus_message_read_basic()</function> reads a basic type from a
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message and advances the read position in the message. The set of basic
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types and their ascii codes passed in <parameter>type</parameter> are
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described in the <ulink
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url="https://dbus.freedesktop.org/doc/dbus-specification.html">D-Bus
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Specification</ulink>.
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</para>
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<para>
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If <parameter>p</parameter> is not NULL, it should contain a pointer to an
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appropriate object. For example, if <parameter>type</parameter> is
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<constant>'y'</constant>, the object passed in <parameter>p</parameter>
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should have type <code>uint8_t *</code>. If <parameter>type</parameter>
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is <constant>'s'</constant>, the object passed in <parameter>p</parameter>
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should have type <code>const char **</code>. Note that, if the basic type
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is a pointer (e.g., <code>const char *</code> in the case of a string),
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the pointer is only borrowed and the contents must be copied if they are
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to be used after the end of the messages lifetime. Similarly, during the
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lifetime of such a pointer, the message must not be modified.
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</para>
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<para>
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If there is no object of the specified type at the current position in the
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message, an error is returned.
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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>
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On success, <function>sd_bus_message_read_basic()</function> returns 0 or
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a positive integer. On failure, it returns a negative errno-style error
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code.
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</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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</para>
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</refsect1>
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</refentry>
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