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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</span><hr><div class="refentry"><a name="sd_bus_message_append_string_memfd"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_bus_message_append_string_memfd, sd_bus_message_append_string_iovec, sd_bus_message_append_string_space — Attach a string to a message</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-bus.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int sd_bus_message_append_string_memfd(</code></td><td>sd_bus_message *<var class="pdparam">m</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">memfd</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int sd_bus_message_append_string_iovec(</code></td><td>sd_bus_message *<var class="pdparam">m</var>, </td></tr><tr><td> </td><td>const struct iovec *<var class="pdparam">iov</var>, </td></tr><tr><td> </td><td>unsigned <var class="pdparam">n</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int sd_bus_message_append_string_space(</code></td><td>sd_bus_message *<var class="pdparam">m</var>, </td></tr><tr><td> </td><td>size_t <var class="pdparam">size</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">s</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm140400234711504"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>The functions
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<code class="function">sd_bus_message_append_string_memfd</code> and
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<code class="function">sd_bus_message_append_string_iovec</code> can be
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used to append a single string (item of type "<code class="literal">s</code>")
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to message <em class="parameter"><code>m</code></em>.</p><p>In case of
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<code class="function">sd_bus_message_append_string_memfd</code>, the
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contents of <em class="parameter"><code>memfd</code></em> are the string. They must
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satisfy the same constraints as described for the
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"<code class="literal">s</code>" type in
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<a href="sd_bus_message_append_basic.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_message_append_basic</span>(3)</span></a>.</p><p>In case of
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<code class="function">sd_bus_message_append_string_iovec</code>, the
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payload of <em class="parameter"><code>iov</code></em> is the string. It must
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satisfy the same constraints as described for the
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"<code class="literal">s</code>" type in
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<a href="sd_bus_message_append_basic.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_message_append_basic</span>(3)</span></a>.</p><p>The <em class="parameter"><code>iov</code></em> argument must point to
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<em class="parameter"><code>n</code></em> <span class="structname">struct iovec</span>
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structures. Each structure may have the
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<span class="structname">iov_base</span> field set, in which case the
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memory pointed to will be copied into the message, or unset, in
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which case a block of spaces (ASCII 32) of length
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<span class="structname">iov_len</span> will be inserted. The
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memory pointed at by <em class="parameter"><code>iov</code></em> may be changed
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after this call.</p><p>The
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<code class="function">sd_bus_message_append_string_space</code> function appends
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space for a string to message <em class="parameter"><code>m</code></em>. It behaves
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similar to <code class="function">sd_bus_message_append_basic</code> with
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type "<code class="literal">s</code>", but instead of copying a string into
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the message, it returns a pointer to the destination area to
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the caller in pointer <em class="parameter"><code>p</code></em>. Space for the string
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of length <em class="parameter"><code>size</code></em> plus the terminating
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<code class="constant">NUL</code> is allocated.</p></div><div class="refsect1"><a name="idm140400238594560"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p>On success, those calls return 0 or a positive integer. On
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failure, they returns a negative errno-style error code.</p></div><div class="refsect1"><a name="errors"></a><h2 id="Errors">Errors<a class="headerlink" title="Permalink to this headline" href="#Errors">¶</a></h2><p>Returned errors may indicate the following problems:</p><div class="variablelist"><dl class="variablelist"><dt id="-EINVAL"><span class="term"><code class="constant">-EINVAL</code></span><a class="headerlink" title="Permalink to this term" href="#-EINVAL">¶</a></dt><dd><p>Specified parameter is invalid.
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</p></dd><dt id="-EPERM"><span class="term"><code class="constant">-EPERM</code></span><a class="headerlink" title="Permalink to this term" href="#-EPERM">¶</a></dt><dd><p>Message has been sealed.
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</p></dd><dt id="-ESTALE"><span class="term"><code class="constant">-ESTALE</code></span><a class="headerlink" title="Permalink to this term" href="#-ESTALE">¶</a></dt><dd><p>Message is in invalid state.
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</p></dd><dt id="-ENXIO"><span class="term"><code class="constant">-ENXIO</code></span><a class="headerlink" title="Permalink to this term" href="#-ENXIO">¶</a></dt><dd><p>Message cannot be appended to.
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</p></dd><dt id="-ENOMEM"><span class="term"><code class="constant">-ENOMEM</code></span><a class="headerlink" title="Permalink to this term" href="#-ENOMEM">¶</a></dt><dd><p>Memory allocation failed.</p></dd></dl></div></div><div class="refsect1"><a name="idm140400238585024"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>The functions described here are available as a shared library,
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which can be compiled and linked to with the
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<code class="constant">libsystemd</code> <a href="http://linux.die.net/man/1/pkg-config"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a>
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file.</p></div><div class="refsect1"><a name="idm140400238582112"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
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<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
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<a href="sd-bus.html"><span class="citerefentry"><span class="refentrytitle">sd-bus</span>(3)</span></a>,
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<a href="sd_bus_message_append_basic.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_message_append_basic</span>(3)</span></a>,
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<a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html" target="_top">The D-Bus specification</a>
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</p></div></div></body></html>
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