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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_pid_get_session"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_pid_get_session, sd_pid_get_unit, sd_pid_get_user_unit, sd_pid_get_owner_uid, sd_pid_get_machine_name, sd_pid_get_slice, sd_peer_get_session, sd_peer_get_unit, sd_peer_get_user_unit, sd_peer_get_owner_uid, sd_peer_get_machine_name, sd_peer_get_slice — Determine session, service, owner of a
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session, container/VM or slice of a specific
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PID or socket peer</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-login.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_pid_get_session</b>(</code></td><td>pid_t <var class="pdparam">pid</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">session</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_pid_get_unit</b>(</code></td><td>pid_t <var class="pdparam">pid</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">unit</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_pid_get_user_unit</b>(</code></td><td>pid_t <var class="pdparam">pid</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">unit</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_pid_get_owner_uid</b>(</code></td><td>pid_t <var class="pdparam">pid</var>, </td></tr><tr><td> </td><td>uid_t *<var class="pdparam">uid</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_pid_get_machine_name</b>(</code></td><td>pid_t <var class="pdparam">pid</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">name</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_pid_get_slice</b>(</code></td><td>pid_t <var class="pdparam">pid</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">slice</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_peer_get_session</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">session</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_peer_get_unit</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">unit</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_peer_get_user_unit</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">unit</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_peer_get_owner_uid</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>uid_t *<var class="pdparam">uid</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_peer_get_machine_name</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">name</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_peer_get_slice</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>char **<var class="pdparam">slice</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm139799154390592"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_pid_get_session()</code> may be used to
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determine the login session identifier of a process identified by
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the specified process identifier. The session identifier is a
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short string, suitable for usage in file system paths. Note that
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not all processes are part of a login session (e.g. system service
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processes, user processes that are shared between multiple
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sessions of the same user, or kernel threads). For processes not
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being part of a login session this function will fail. The
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returned string needs to be freed with the libc
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<a href="http://man7.org/linux/man-pages/man3/free.3.html"><span class="citerefentry"><span class="refentrytitle">free</span>(3)</span></a>
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call after use.</p><p><code class="function">sd_pid_get_unit()</code> may be used to
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determine the systemd system unit (i.e. system service) identifier
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of a process identified by the specified PID. The unit name is a
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short string, suitable for usage in file system paths. Note that
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not all processes are part of a system unit/service (e.g. user
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processes, or kernel threads). For processes not being part of a
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systemd system unit this function will fail. (More specifically:
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this call will not work for processes that are part of user units,
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use <code class="function">sd_pid_get_user_unit()</code> for that.) The
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returned string needs to be freed with the libc
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<a href="http://man7.org/linux/man-pages/man3/free.3.html"><span class="citerefentry"><span class="refentrytitle">free</span>(3)</span></a>
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call after use.</p><p><code class="function">sd_pid_get_user_unit()</code> may be used to
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determine the systemd user unit (i.e. user service) identifier of
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a process identified by the specified PID. This is similar to
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<code class="function">sd_pid_get_unit()</code> but applies to user units
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instead of system units.</p><p><code class="function">sd_pid_get_owner_uid()</code> may be used to
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determine the Unix user identifier of the owner of the session of
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a process identified the specified PID. Note that this function
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will succeed for user processes which are shared between multiple
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login sessions of the same user, where
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<code class="function">sd_pid_get_session()</code> will fail. For processes
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not being part of a login session and not being a shared process
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of a user this function will fail.</p><p><code class="function">sd_pid_get_machine_name()</code> may be used
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to determine the name of the VM or container is a member of. The
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machine name is a short string, suitable for usage in file system
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paths. The returned string needs to be freed with the libc
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<a href="http://man7.org/linux/man-pages/man3/free.3.html"><span class="citerefentry"><span class="refentrytitle">free</span>(3)</span></a>
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call after use.</p><p><code class="function">sd_pid_get_slice()</code> may be used to
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determine the slice unit the process is a member of. See
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<a href="systemd.slice.html"><span class="citerefentry"><span class="refentrytitle">systemd.slice</span>(5)</span></a>
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for details about slices. The returned string needs to be freed
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with the libc
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<a href="http://man7.org/linux/man-pages/man3/free.3.html"><span class="citerefentry"><span class="refentrytitle">free</span>(3)</span></a>
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call after use.</p><p>If the <code class="varname">pid</code> parameter of any of these
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functions is passed as 0, the operation is executed for the
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calling process.</p><p>The <code class="function">sd_peer_get_session()</code>,
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<code class="function">sd_peer_get_unit()</code>,
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<code class="function">sd_peer_get_user_unit()</code>,
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<code class="function">sd_peer_get_owner_uid()</code>,
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<code class="function">sd_peer_get_machine_name()</code> and
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<code class="function">sd_peer_get_slice()</code> calls operate similar to
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their PID counterparts, but operate on a connected AF_UNIX socket
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and retrieve information about the connected peer process.</p></div><div class="refsect1"><a name="idm139799149455248"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p>On success, these calls return 0 or a positive integer. On
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failure, these calls return a negative errno-style error
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code.</p></div><div class="refsect1"><a name="idm139799149453952"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>The <code class="function">sd_pid_get_session()</code>,
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<code class="function">sd_pid_get_unit()</code>,
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<code class="function">sd_pid_get_user_unit()</code>,
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<code class="function">sd_pid_get_owner_uid()</code>,
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<code class="function">sd_pid_get_machine_name()</code>,
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<code class="function">sd_pid_get_slice()</code>,
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<code class="function">sd_peer_get_session()</code>,
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<code class="function">sd_peer_get_unit()</code>,
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<code class="function">sd_peer_get_user_unit()</code>,
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<code class="function">sd_peer_get_owner_uid()</code>,
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<code class="function">sd_peer_get_machine_name()</code> and
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<code class="function">sd_peer_get_slice()</code> interfaces are
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available as a shared library, which can be compiled
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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><p>Note that the login session identifier as
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returned by <code class="function">sd_pid_get_session()</code>
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is completely unrelated to the process session
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identifier as returned by
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<a href="http://man7.org/linux/man-pages/man2/getsid.2.html"><span class="citerefentry"><span class="refentrytitle">getsid</span>(2)</span></a>.</p></div><div class="refsect1"><a name="idm139799149442016"></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-login.html"><span class="citerefentry"><span class="refentrytitle">sd-login</span>(3)</span></a>,
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<a href="sd_session_is_active.html"><span class="citerefentry"><span class="refentrytitle">sd_session_is_active</span>(3)</span></a>,
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<a href="http://man7.org/linux/man-pages/man2/getsid.2.html"><span class="citerefentry"><span class="refentrytitle">getsid</span>(2)</span></a>,
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<a href="systemd.slice.html"><span class="citerefentry"><span class="refentrytitle">systemd.slice</span>(5)</span></a>,
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<a href="systemd-machined.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-machined.service</span>(8)</span></a>
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</p></div></div></body></html>
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