man/sd_bus_creds_get_tid_comm.html

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  22   <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</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_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_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="idm139798720989760"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>These functions return information from an
  23     <em class="parameter"><code>sd_bus_creds</code></em> object. It may be created with
  24     <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>,
  25     in which case it will describe the specified process, or it may be
  26     created by
  27     <a href="sd_bus_get_owner_creds.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_get_owner_creds</span>(3)</span></a>,
  28     in which case it will describe the process at the other endpoint
  29     of a connection.
  30     </p><p><code class="function">sd_bus_creds_get_pid()</code> will retrieve the
  31     PID (process identifier).</p><p><code class="function">sd_bus_creds_get_tid()</code> will retrieve the
  32     TID (thread identifier).</p><p><code class="function">sd_bus_creds_get_uid()</code> will retrieve the
  33     numeric UID (user identifier).</p><p><code class="function">sd_bus_creds_get_gid()</code> will retrieve the
  34     numeric GID (group identifier).</p><p><code class="function">sd_bus_creds_get_comm()</code> will retrieve the
  35     comm field (truncated name of the executable, as stored in
  36     <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/comm</code>).
  37     </p><p><code class="function">sd_bus_creds_get_tid_comm()</code> will retrieve
  38     the comm field of the thread (as stored in
  39     <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/task/<em class="replaceable"><code>tid</code></em>/comm</code>).
  40     </p><p><code class="function">sd_bus_creds_get_exe()</code> will retrieve the
  41     path to the program (as stored in the
  42     <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/exe</code>
  43     link, but with "<code class="literal"> (deleted)</code>" suffix removed).
  44     </p><p><code class="function">sd_bus_creds_get_cmdline()</code> will retrieve
  45     an array of command line arguments (as stored in
  46     <code class="filename">/proc/<em class="replaceable"><code>pid</code></em>/cmdline</code>).
  47     </p><p><code class="function">sd_bus_creds_get_cgroup()</code> will retrieve
  48     the cgroup path. See <a class="ulink" href="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt" target="_top">cgroups.txt</a>.
  49     </p><p><code class="function">sd_bus_creds_get_unit()</code> will retrieve the
  50     systemd unit name (in the system instance of systemd) that the
  51     process is part of. See
  52     <a href="systemd.unit.html"><span class="citerefentry"><span class="refentrytitle">systemd.unit</span>(5)</span></a>.
  53     </p><p><code class="function">sd_bus_creds_get_user_unit()</code> will
  54     retrieve the systemd unit name (in the user instance of systemd)
  55     that the process is part of. See
  56     <a href="systemd.unit.html"><span class="citerefentry"><span class="refentrytitle">systemd.unit</span>(5)</span></a>.
  57     </p><p><code class="function">sd_bus_creds_get_slice()</code> will retrieve
  58     the systemd slice (a unit in the system instance of systemd) that
  59     the process is part of. See
  60     <a href="systemd.slice.html"><span class="citerefentry"><span class="refentrytitle">systemd.slice</span>(5)</span></a>.
  61     </p><p><code class="function">sd_bus_creds_get_session()</code> will retrieve
  62     the logind session that the process is part of. See
  63     <a href="systemd-logind.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-logind.service</span>(8)</span></a>.
  64     </p><p><code class="function">sd_bus_creds_get_owner_uid()</code> will retrieve
  65     the numeric UID (user identifier) of the user who owns the slice
  66     that the process is part of. See
  67     <a href="systemd.slice.html"><span class="citerefentry"><span class="refentrytitle">systemd.slice</span>(5)</span></a>
  68     .
  69     </p><p><code class="function">sd_bus_creds_has_effective_cap()</code> will
  70     check whether the capability specified by
  71     <em class="parameter"><code>capability</code></em> was set in the effective
  72     capabilities mask. A positive return value means that is was
  73     set, zero means that it was not set, and a negative return
  74     value signifies an error. See
  75     <a href="http://man7.org/linux/man-pages/man7/capabilities.7.html"><span class="citerefentry"><span class="refentrytitle">capabilities</span>(7)</span></a>
  76     and <code class="varname">Capabilities=</code> and
  77     <code class="varname">CapabilityBoundingSet=</code> settings in
  78     <a href="systemd.exec.html"><span class="citerefentry"><span class="refentrytitle">systemd.exec</span>(5)</span></a>.
  79     </p><p><code class="function">sd_bus_creds_has_permitted_cap()</code> is
  80     similar to <code class="function">sd_bus_creds_has_effective_cap()</code>,
  81     but will check the permitted capabilities mask.</p><p><code class="function">sd_bus_creds_has_inheritable_cap()</code> is
  82     similar to <code class="function">sd_bus_creds_has_effective_cap()</code>,
  83     but will check the inheritable capabilities mask.</p><p><code class="function">sd_bus_creds_has_bounding_cap()</code> is
  84     similar to <code class="function">sd_bus_creds_has_effective_cap()</code>,
  85     but will check the bounding capabilities mask.</p><p><code class="function">sd_bus_creds_get_selinux_context()</code> will
  86     retrieve the SELinux security context (label) of the process.</p><p><code class="function">sd_bus_creds_get_audit_session_id()</code> will
  87     retrieve the audit session identifier of the process.</p><p><code class="function">sd_bus_creds_get_audit_login_uid()</code> will
  88     retrieve the audit user login identifier (the identifier of the
  89     user who is "responsible" for the session).</p><p><code class="function">sd_bus_creds_get_unique_name()</code> will
  90     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
  91     D-Bus specification</a>.</p><p><code class="function">sd_bus_creds_get_well_known_names()</code> will
  92     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
  93     D-Bus specification</a>.</p><p><code class="function">sd_bus_creds_get_connection_name()</code> will
  94     retrieve a descriptive name of the bus connection of the
  95     peer. This name is useful to discern multiple bus connections by
  96     the same peer, and may be altered by the peer with the
  97     <a href="sd_bus_set_name().html"><span class="citerefentry"><span class="refentrytitle">sd_bus_set_name()</span>(3)</span></a>
  98     call.</p><p>All functions that take a <em class="parameter"><code>const
  99     char**</code></em> parameter will store the answer there as an
 100     address of a NUL-terminated string. It will be valid as long as
 101     <em class="parameter"><code>c</code></em> remains valid, and should not be freed or
 102     modified by the caller.</p><p>All functions that take a <em class="parameter"><code>char***</code></em>
 103     parameter will store the answer there as an address of a an array
 104     of strings. Each invidividual string is NUL-terminated, and the
 105     array is NULL-terminated as a whole. It will be valid as long as
 106     <em class="parameter"><code>c</code></em> remains valid, and should not be freed or
 107     modified by the caller.</p></div><div class="refsect1"><a name="idm139798720943216"></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
 108     failure, these calls return a negative errno-style error code.
 109     </p></div><div class="refsect1"><a name="idm139798720941920"></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
 110         <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.
 111         This will be returned by <code class="function">sd_bus_get_unit()</code>,
 112         <code class="function">sd_bus_get_user_unit()</code>,
 113         <code class="function">sd_bus_get_slice()</code>,
 114         <code class="function">sd_bus_get_session()</code>, and
 115         <code class="function">sd_bus_get_name_creds_uid()</code> if the sender is not
 116         part of a systemd system unit, systemd user unit, systemd
 117         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.
 118         <code class="filename">libsystemd</code> might be out of sync with
 119         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>.
 120         </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="idm139798720928000"></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
 121     described here are available as a shared library, which can be
 122     compiled and linked to with the
 123     <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>
 124     file.</p></div><div class="refsect1"><a name="idm139798720924816"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
 125       <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
 126       <a href="sd-bus.html"><span class="citerefentry"><span class="refentrytitle">sd-bus</span>(3)</span></a>,
 127       <a href="http://man7.org/linux/man-pages/man2/fork.2.html"><span class="citerefentry"><span class="refentrytitle">fork</span>(2)</span></a>,
 128       <a href="http://man7.org/linux/man-pages/man2/execve.2.html"><span class="citerefentry"><span class="refentrytitle">execve</span>(2)</span></a>,
 129       <a href="http://man7.org/linux/man-pages/man7/credentials.7.html"><span class="citerefentry"><span class="refentrytitle">credentials</span>(7)</span></a>,
 130       <a href="http://man7.org/linux/man-pages/man3/free.3.html"><span class="citerefentry"><span class="refentrytitle">free</span>(3)</span></a>,
 131       <a href="http://man7.org/linux/man-pages/man5/proc.5.html"><span class="citerefentry"><span class="refentrytitle">proc</span>(5)</span></a>,
 132       <a href="systemd.journald-fields.html"><span class="citerefentry"><span class="refentrytitle">systemd.journald-fields</span>(7)</span></a>
 133     </p></div></div></body></html>