| <?xml version='1.0'?> <!--*-nxml-*--> |
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| Copyright 2010 Lennart Poettering |
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| |
| <refentry id="sd_pid_get_session" conditional='HAVE_PAM'> |
| |
| <refentryinfo> |
| <title>sd_pid_get_session</title> |
| <productname>systemd</productname> |
| |
| <authorgroup> |
| <author> |
| <contrib>Developer</contrib> |
| <firstname>Lennart</firstname> |
| <surname>Poettering</surname> |
| <email>lennart@poettering.net</email> |
| </author> |
| </authorgroup> |
| </refentryinfo> |
| |
| <refmeta> |
| <refentrytitle>sd_pid_get_session</refentrytitle> |
| <manvolnum>3</manvolnum> |
| </refmeta> |
| |
| <refnamediv> |
| <refname>sd_pid_get_session</refname> |
| <refname>sd_pid_get_unit</refname> |
| <refname>sd_pid_get_user_unit</refname> |
| <refname>sd_pid_get_owner_uid</refname> |
| <refname>sd_pid_get_machine_name</refname> |
| <refname>sd_pid_get_slice</refname> |
| <refname>sd_peer_get_session</refname> |
| <refname>sd_peer_get_unit</refname> |
| <refname>sd_peer_get_user_unit</refname> |
| <refname>sd_peer_get_owner_uid</refname> |
| <refname>sd_peer_get_machine_name</refname> |
| <refname>sd_peer_get_slice</refname> |
| <refpurpose>Determine session, service, owner of a |
| session, container/VM or slice of a specific |
| PID or socket peer</refpurpose> |
| </refnamediv> |
| |
| <refsynopsisdiv> |
| <funcsynopsis> |
| <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_pid_get_session</function></funcdef> |
| <paramdef>pid_t <parameter>pid</parameter></paramdef> |
| <paramdef>char **<parameter>session</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_pid_get_unit</function></funcdef> |
| <paramdef>pid_t <parameter>pid</parameter></paramdef> |
| <paramdef>char **<parameter>unit</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_pid_get_user_unit</function></funcdef> |
| <paramdef>pid_t <parameter>pid</parameter></paramdef> |
| <paramdef>char **<parameter>unit</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_pid_get_owner_uid</function></funcdef> |
| <paramdef>pid_t <parameter>pid</parameter></paramdef> |
| <paramdef>uid_t *<parameter>uid</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_pid_get_machine_name</function></funcdef> |
| <paramdef>pid_t <parameter>pid</parameter></paramdef> |
| <paramdef>char **<parameter>name</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_pid_get_slice</function></funcdef> |
| <paramdef>pid_t <parameter>pid</parameter></paramdef> |
| <paramdef>char **<parameter>slice</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_peer_get_session</function></funcdef> |
| <paramdef>int <parameter>fd</parameter></paramdef> |
| <paramdef>char **<parameter>session</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_peer_get_unit</function></funcdef> |
| <paramdef>int <parameter>fd</parameter></paramdef> |
| <paramdef>char **<parameter>unit</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_peer_get_user_unit</function></funcdef> |
| <paramdef>int <parameter>fd</parameter></paramdef> |
| <paramdef>char **<parameter>unit</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_peer_get_owner_uid</function></funcdef> |
| <paramdef>int <parameter>fd</parameter></paramdef> |
| <paramdef>uid_t *<parameter>uid</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_peer_get_machine_name</function></funcdef> |
| <paramdef>int <parameter>fd</parameter></paramdef> |
| <paramdef>char **<parameter>name</parameter></paramdef> |
| </funcprototype> |
| |
| <funcprototype> |
| <funcdef>int <function>sd_peer_get_slice</function></funcdef> |
| <paramdef>int <parameter>fd</parameter></paramdef> |
| <paramdef>char **<parameter>slice</parameter></paramdef> |
| </funcprototype> |
| </funcsynopsis> |
| </refsynopsisdiv> |
| |
| <refsect1> |
| <title>Description</title> |
| |
| <para><function>sd_pid_get_session()</function> may be |
| used to determine the login session identifier of a |
| process identified by the specified process |
| identifier. The session identifier is a short string, |
| suitable for usage in file system paths. Note that not |
| all processes are part of a login session (e.g. system |
| service processes, user processes that are shared |
| between multiple sessions of the same user, or kernel |
| threads). For processes not being part of a login |
| session this function will fail. The returned string |
| needs to be freed with the libc |
| <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
| call after use.</para> |
| |
| <para><function>sd_pid_get_unit()</function> may be |
| used to determine the systemd system unit (i.e. system |
| service) identifier of a process identified by the |
| specified PID. The unit name is a short string, |
| suitable for usage in file system paths. Note that not |
| all processes are part of a system unit/service |
| (e.g. user processes, or kernel threads). For |
| processes not being part of a systemd system unit this |
| function will fail. (More specifically: this call will |
| not work for processes that are part of user units, |
| use <function>sd_pid_get_user_unit()</function> for |
| that.) The returned string needs to be freed with the |
| libc |
| <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
| call after use.</para> |
| |
| <para><function>sd_pid_get_user_unit()</function> may |
| be used to determine the systemd user unit (i.e. user |
| service) identifier of a process identified by the |
| specified PID. This is similar to |
| <function>sd_pid_get_unit()</function> but applies to |
| user units instead of system units.</para> |
| |
| <para><function>sd_pid_get_owner_uid()</function> may |
| be used to determine the Unix user identifier of the |
| owner of the session of a process identified the |
| specified PID. Note that this function will succeed |
| for user processes which are shared between multiple |
| login sessions of the same user, where |
| <function>sd_pid_get_session()</function> will |
| fail. For processes not being part of a login session |
| and not being a shared process of a user this function |
| will fail.</para> |
| |
| <para><function>sd_pid_get_machine_name()</function> |
| may be used to determine the name of the VM or |
| container is a member of. The machine name is a short |
| string, suitable for usage in file system paths. The |
| returned string needs to be freed with the libc |
| <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
| call after use.</para> |
| |
| <para><function>sd_pid_get_slice()</function> may be |
| used to determine the slice unit the process is a |
| member of. See |
| <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry> |
| for details about slices. The returned string needs to |
| be freed with the libc |
| <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
| call after use.</para> |
| |
| <para>If the <varname>pid</varname> parameter of any |
| of these functions is passed as 0, the operation is |
| executed for the calling process.</para> |
| |
| <para>The <function>sd_peer_get_session()</function>, |
| <function>sd_peer_get_unit()</function>, |
| <function>sd_peer_get_user_unit()</function>, |
| <function>sd_peer_get_owner_uid()</function>, |
| <function>sd_peer_get_machine_name()</function> and |
| <function>sd_peer_get_slice()</function> calls operate |
| similar to their PID counterparts, but operate on a |
| connected AF_UNIX socket and retrieve information |
| about the connected peer process.</para> |
| </refsect1> |
| |
| <refsect1> |
| <title>Return Value</title> |
| |
| <para>On success, these calls return 0 or a positive |
| integer. On failure, these calls return a negative |
| errno-style error code.</para> |
| </refsect1> |
| |
| <refsect1> |
| <title>Notes</title> |
| |
| <para>The <function>sd_pid_get_session()</function>, |
| <function>sd_pid_get_unit()</function>, |
| <function>sd_pid_get_user_unit()</function>, |
| <function>sd_pid_get_owner_uid()</function>, |
| <function>sd_pid_get_machine_name()</function>, |
| <function>sd_pid_get_slice()</function>, |
| <function>sd_peer_get_session()</function>, |
| <function>sd_peer_get_unit()</function>, |
| <function>sd_peer_get_user_unit()</function>, |
| <function>sd_peer_get_owner_uid()</function>, |
| <function>sd_peer_get_machine_name()</function> and |
| <function>sd_peer_get_slice()</function> interfaces are |
| available as a shared library, which can be compiled |
| and linked to with the |
| <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
| file.</para> |
| |
| <para>Note that the login session identifier as |
| returned by <function>sd_pid_get_session()</function> |
| is completely unrelated to the process session |
| identifier as returned by |
| <citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>.</para> |
| </refsect1> |
| |
| <refsect1> |
| <title>See Also</title> |
| |
| <para> |
| <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |
| <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
| <citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
| <citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>, |
| <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
| <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
| </para> |
| </refsect1> |
| |
| </refentry> |