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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 217</span><hr><div class="refentry"><a name="sd_journal_get_realtime_usec"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_journal_get_realtime_usec, sd_journal_get_monotonic_usec — Read timestamps from the current journal entry</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-journal.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_get_realtime_usec</b>(</code></td><td>sd_journal *<var class="pdparam">j</var>, </td></tr><tr><td> </td><td>uint64_t *<var class="pdparam">usec</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 <b class="fsfunc">sd_journal_get_monotonic_usec</b>(</code></td><td>sd_journal *<var class="pdparam">j</var>, </td></tr><tr><td> </td><td>uint64_t *<var class="pdparam">usec</var>, </td></tr><tr><td> </td><td>sd_id128_t *<var class="pdparam">boot_id</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm214176329296"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_journal_get_realtime_usec()</code>
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gets the realtime (wallclock) timestamp of the
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current journal entry. It takes two arguments: the
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journal context object and a pointer to a 64-bit
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unsigned integer to store the timestamp in. The
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timestamp is in microseconds since the epoch,
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i.e. <code class="constant">CLOCK_REALTIME</code>.</p><p><code class="function">sd_journal_get_monotonic_usec()</code>
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gets the monotonic timestamp of the current journal
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entry. It takes three arguments: the journal context
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object, a pointer to a 64-bit unsigned integer to
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store the timestamp in, as well as a 128-bit ID buffer
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to store the boot ID of the monotonic timestamp.
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The timestamp is in microseconds since boot-up of
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the specific boot,
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i.e. <code class="constant">CLOCK_MONOTONIC</code>. Since the
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monotonic clock begins new with every reboot, it only
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defines a well-defined point in time when used
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together with an identifier identifying the boot. See
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<a href="sd_id128_get_boot.html"><span class="citerefentry"><span class="refentrytitle">sd_id128_get_boot</span>(3)</span></a>
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for more information. If the boot ID parameter is
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passed <code class="constant">NULL</code>, the function will
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fail if the monotonic timestamp of the current entry
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is not of the current system boot.</p><p>Note that these functions will not work before
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<a href="sd_journal_next.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_next</span>(3)</span></a>
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(or related call) has been called at least
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once, in order to position the read pointer at a valid entry.</p></div><div class="refsect1"><a name="idm214180220256"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p><code class="function">sd_journal_get_realtime_usec()</code>
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and
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<code class="function">sd_journal_get_monotonic_usec()</code>
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returns 0 on success or a negative errno-style error
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code. If the boot ID parameter was passed <code class="constant">NULL</code> and the
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monotonic timestamp of the current journal entry is
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not of the current system boot, -ESTALE is returned by <code class="function">sd_journal_get_monotonic_usec()</code>.</p></div><div class="refsect1"><a name="idm214180216320"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>The
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<code class="function">sd_journal_get_realtime_usec()</code>
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and
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<code class="function">sd_journal_get_monotonic_usec()</code>
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interfaces are available as a shared library, which can
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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="idm214180211888"></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-journal.html"><span class="citerefentry"><span class="refentrytitle">sd-journal</span>(3)</span></a>,
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<a href="sd_journal_open.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_open</span>(3)</span></a>,
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<a href="sd_journal_next.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_next</span>(3)</span></a>,
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<a href="sd_journal_get_data.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_get_data</span>(3)</span></a>,
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<a href="sd_id128_get_boot.html"><span class="citerefentry"><span class="refentrytitle">sd_id128_get_boot</span>(3)</span></a>,
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<a href="http://man7.org/linux/man-pages/man2/clock_gettime.2.html"><span class="citerefentry"><span class="refentrytitle">clock_gettime</span>(2)</span></a>,
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<a href="sd_journal_get_cutoff_realtime_usec.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_get_cutoff_realtime_usec</span>(3)</span></a>
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</p></div></div></body></html>
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