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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_bus_creds_get_pid"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_bus_creds_get_pid, sd_bus_creds_get_pid_starttime, sd_bus_creds_get_tid, sd_bus_creds_get_uid, sd_bus_creds_get_gid, sd_bus_creds_get_comm, sd_bus_creds_get_tid_comm, sd_bus_creds_get_exe, sd_bus_creds_get_cmdline, sd_bus_creds_get_cgroup, sd_bus_creds_get_unit, sd_bus_creds_get_user_unit, sd_bus_creds_get_slice, sd_bus_creds_get_session, sd_bus_creds_get_owner_uid, sd_bus_creds_has_effective_cap, sd_bus_creds_has_permitted_cap, sd_bus_creds_has_inheritable_cap, sd_bus_creds_has_bounding_cap, sd_bus_creds_get_selinux_context, sd_bus_creds_get_audit_session_id, sd_bus_creds_get_audit_login_uid, sd_bus_creds_get_unique_name, sd_bus_creds_get_well_known_names, sd_bus_creds_get_connection_name — Retrieve fields from a credentials object</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include &lt;systemd/sd-bus.h&gt;</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_bus_creds_get_pid</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>pid_t *<var class="pdparam">pid</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_bus_creds_get_pid_starttime</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</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_bus_creds_get_tid</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>pid_t *<var class="pdparam">tid</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_bus_creds_get_pid</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</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_bus_creds_get_gid</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>gid_t *<var class="pdparam">gid</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_bus_creds_get_comm</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const char **<var class="pdparam">comm</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_bus_creds_get_tid_comm</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const char **<var class="pdparam">comm</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_bus_creds_get_exe</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const char **<var class="pdparam">exe</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_bus_creds_get_cmdline</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>char ***<var class="pdparam">cmdline</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_bus_creds_get_cgroup</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const char **<var class="pdparam">cgroup</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_bus_creds_get_unit</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const 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_bus_creds_get_user_unit</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const 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_bus_creds_get_slice</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const 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_bus_creds_get_session</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const 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_bus_creds_get_owner_uid</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</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_bus_creds_has_effective_cap</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">capability</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_bus_creds_has_permitted_cap</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">capability</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_bus_creds_has_inheritable_cap</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">capability</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_bus_creds_has_bounding_cap</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">capability</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_bus_creds_get_selinux_context</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const char **<var class="pdparam">context</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_bus_creds_get_audit_session_id</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>uint32_t *<var class="pdparam">sessionid</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_bus_creds_get_audit_login_uid</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>uid_t *<var class="pdparam">loginuid</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_bus_creds_get_unique_name</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const 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_bus_creds_get_well_known_names</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</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_bus_creds_get_connection_name</b>(</code></td><td>sd_bus_creds *<var class="pdparam">c</var>, </td></tr><tr><td> </td><td>const char **<var class="pdparam">name</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm214177346544"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>These functions return information from an
    <em class="parameter"><code>sd_bus_creds</code></em> object. It may be created with
    <a href="sd_bus_creds_new_from_pid.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_creds_new_from_pid</span>(3)</span></a>,
    in which case it will describe the specified process, or it may be
    created by
    <a href="sd_bus_get_owner_creds.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_get_owner_creds</span>(3)</span></a>,
    in which case it will describe the process at the other endpoint
    of a connection.
    </p><p><code class="function">sd_bus_creds_get_pid()</code> will retrieve the
    PID (process identifier).</p><p><code class="function">sd_bus_creds_get_pid_starttime()</code> will
    retrieve the time since the start of the epoch in microseconds
    since the process was started.</p><p><code class="function">sd_bus_creds_get_tid()</code> will retrieve the
    TID (thread identifier).</p><p><code class="function">sd_bus_creds_get_uid()</code> will retrieve the
    numeric UID (user identifier).</p><p><code class="function">sd_bus_creds_get_gid()</code> will retrieve the
    numeric GID (group identifier).</p><p><code class="function">sd_bus_creds_get_comm()</code> will retrieve the
    comm field (truncated name of the executable, as stored in
    <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/comm</code>).
    </p><p><code class="function">sd_bus_creds_get_tid_comm()</code> will retrieve
    the comm field of the thread (as stored in
    <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/task/<em class="replaceable"><code>tid</code></em>/comm</code>).
    </p><p><code class="function">sd_bus_creds_get_exe()</code> will retrieve the
    path to the program (as stored in the
    <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/exe</code>
    link, but with "<code class="literal"> (deleted)</code>" suffix removed).
    </p><p><code class="function">sd_bus_creds_get_cmdline()</code> will retrieve
    an array of command-line arguments (as stored in
    <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/cmdline</code>).
    </p><p><code class="function">sd_bus_creds_get_cgroup()</code> will retrieve
    the cgroup path. See <a class="ulink" href="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt" target="_top">cgroups.txt</a>.
    </p><p><code class="function">sd_bus_creds_get_unit()</code> will retrieve the
    systemd unit name (in the system instance of systemd) that the
    process is part of. See
    <a href="systemd.unit.html"><span class="citerefentry"><span class="refentrytitle">systemd.unit</span>(5)</span></a>.
    </p><p><code class="function">sd_bus_creds_get_user_unit()</code> will
    retrieve the systemd unit name (in the user instance of systemd)
    that the process is part of. See
    <a href="systemd.unit.html"><span class="citerefentry"><span class="refentrytitle">systemd.unit</span>(5)</span></a>.
    </p><p><code class="function">sd_bus_creds_get_slice()</code> will retrieve
    the systemd slice (a unit in the system instance of systemd) that
    the process is part of. See
    <a href="systemd.slice.html"><span class="citerefentry"><span class="refentrytitle">systemd.slice</span>(5)</span></a>.
    </p><p><code class="function">sd_bus_creds_get_session()</code> will retrieve
    the logind session that the process is part of. See
    <a href="systemd-logind.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-logind.service</span>(8)</span></a>.
    </p><p><code class="function">sd_bus_creds_get_owner_uid()</code> will retrieve
    the numeric UID (user identifier) of the user who owns the slice
    that the process is part of. See
    <a href="systemd.slice.html"><span class="citerefentry"><span class="refentrytitle">systemd.slice</span>(5)</span></a>
    .
    </p><p><code class="function">sd_bus_creds_has_effective_cap()</code> will
    check whether the capability specified by
    <em class="parameter"><code>capability</code></em> was set in the effective
    capabilities mask. A positive return value means that is was
    set, zero means that it was not set, and a negative return
    value signifies an error. See
    <a href="http://man7.org/linux/man-pages/man7/capabilities.7.html"><span class="citerefentry"><span class="refentrytitle">capabilities</span>(7)</span></a>
    and <code class="varname">Capabilities=</code> and
    <code class="varname">CapabilityBoundingSet=</code> settings in
    <a href="systemd.exec.html"><span class="citerefentry"><span class="refentrytitle">systemd.exec</span>(5)</span></a>.
    </p><p><code class="function">sd_bus_creds_has_permitted_cap()</code> is
    similar to <code class="function">sd_bus_creds_has_effective_cap()</code>,
    but will check the permitted capabilities mask.</p><p><code class="function">sd_bus_creds_has_inheritable_cap()</code> is
    similar to <code class="function">sd_bus_creds_has_effective_cap()</code>,
    but will check the inheritable capabilities mask.</p><p><code class="function">sd_bus_creds_has_bounding_cap()</code> is
    similar to <code class="function">sd_bus_creds_has_effective_cap()</code>,
    but will check the bounding capabilities mask.</p><p><code class="function">sd_bus_creds_get_selinux_context()</code> will
    retrieve the SELinux security context (label) of the process.</p><p><code class="function">sd_bus_creds_get_audit_session_id()</code> will
    retrieve the audit session identifier of the process.</p><p><code class="function">sd_bus_creds_get_audit_login_uid()</code> will
    retrieve the audit user login identifier (the identifier of the
    user who is "responsible" for the session).</p><p><code class="function">sd_bus_creds_get_unique_name()</code> will
    retrieve the D-Bus unique name. See <a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus" target="_top">The
    D-Bus specification</a>.</p><p><code class="function">sd_bus_creds_get_well_known_names()</code> will
    retrieve the set of D-Bus well-known names. See <a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus" target="_top">The
    D-Bus specification</a>.</p><p><code class="function">sd_bus_creds_get_connection_name()</code> will
    retrieve a descriptive name of the bus connection of the
    peer. This name is useful to discern multiple bus connections by
    the same peer, and may be altered by the peer with the
    <a href="sd_bus_set_name().html"><span class="citerefentry"><span class="refentrytitle">sd_bus_set_name()</span>(3)</span></a>
    call.</p><p>All functions that take a <em class="parameter"><code>const
    char**</code></em> parameter will store the answer there as an
    address of a NUL-terminated string. It will be valid as long as
    <em class="parameter"><code>c</code></em> remains valid, and should not be freed or
    modified by the caller.</p><p>All functions that take a <em class="parameter"><code>char***</code></em>
    parameter will store the answer there as an address of a an array
    of strings. Each invidividual string is NUL-terminated, and the
    array is NULL-terminated as a whole. It will be valid as long as
    <em class="parameter"><code>c</code></em> remains valid, and should not be freed or
    modified by the caller.</p></div><div class="refsect1"><a name="idm214177299008"></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
    failure, these calls return a negative errno-style error code.
    </p></div><div class="refsect1"><a name="idm214177297712"></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="-ENODATA"><span class="term"><code class="constant">-ENODATA</code></span><a class="headerlink" title="Permalink to this term" href="#-ENODATA">¶</a></dt><dd><p>Given field is not available in
        <em class="parameter"><code>c</code></em>.</p></dd><dt id="-ENOENT"><span class="term"><code class="constant">-ENOENT</code></span><a class="headerlink" title="Permalink to this term" href="#-ENOENT">¶</a></dt><dd><p>Given field is not specified for the sender.
        This will be returned by <code class="function">sd_bus_get_unit()</code>,
        <code class="function">sd_bus_get_user_unit()</code>,
        <code class="function">sd_bus_get_slice()</code>,
        <code class="function">sd_bus_get_session()</code>, and
        <code class="function">sd_bus_get_name_creds_uid()</code> if the sender is not
        part of a systemd system unit, systemd user unit, systemd
        slice, logind session, or a systemd user session.</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>An error occurred in parsing cgroup paths.
        <code class="filename">libsystemd</code> might be out of sync with
        the running systemd version.</p></dd><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 pointer parameter is <code class="constant">NULL</code>.
        </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="idm214177283792"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p><code class="function">sd_bus_open_user()</code> and other functions
    described here are available as a shared library, which can be
    compiled and linked to with the
    <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>
    file.</p></div><div class="refsect1"><a name="idm214177280608"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
      <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
      <a href="sd-bus.html"><span class="citerefentry"><span class="refentrytitle">sd-bus</span>(3)</span></a>,
      <a href="http://man7.org/linux/man-pages/man2/fork.2.html"><span class="citerefentry"><span class="refentrytitle">fork</span>(2)</span></a>,
      <a href="http://man7.org/linux/man-pages/man2/execve.2.html"><span class="citerefentry"><span class="refentrytitle">execve</span>(2)</span></a>,
      <a href="http://man7.org/linux/man-pages/man7/credentials.7.html"><span class="citerefentry"><span class="refentrytitle">credentials</span>(7)</span></a>,
      <a href="http://man7.org/linux/man-pages/man3/free.3.html"><span class="citerefentry"><span class="refentrytitle">free</span>(3)</span></a>,
      <a href="http://man7.org/linux/man-pages/man5/proc.5.html"><span class="citerefentry"><span class="refentrytitle">proc</span>(5)</span></a>,
      <a href="systemd.journald-fields.html"><span class="citerefentry"><span class="refentrytitle">systemd.journald-fields</span>(7)</span></a>
    </p></div></div></body></html>