man/sd_bus_creds_get_cmdline.html

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