diff options
Diffstat (limited to 'man/sd_session_is_active.xml')
| -rw-r--r-- | man/sd_session_is_active.xml | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/man/sd_session_is_active.xml b/man/sd_session_is_active.xml new file mode 100644 index 0000000..79cf8af --- /dev/null +++ b/man/sd_session_is_active.xml @@ -0,0 +1,368 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> +<!-- SPDX-License-Identifier: LGPL-2.1-or-later --> + +<refentry id="sd_session_is_active" conditional='HAVE_PAM' + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>sd_session_is_active</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_session_is_active</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_session_is_active</refname> + <refname>sd_session_is_remote</refname> + <refname>sd_session_get_state</refname> + <refname>sd_session_get_uid</refname> + <refname>sd_session_get_username</refname> + <refname>sd_session_get_seat</refname> + <refname>sd_session_get_start_time</refname> + <refname>sd_session_get_service</refname> + <refname>sd_session_get_type</refname> + <refname>sd_session_get_class</refname> + <refname>sd_session_get_desktop</refname> + <refname>sd_session_get_display</refname> + <refname>sd_session_get_tty</refname> + <refname>sd_session_get_vt</refname> + <refname>sd_session_get_remote_host</refname> + <refname>sd_session_get_remote_user</refname> + <refname>sd_session_get_leader</refname> + <refpurpose>Determine state of a specific session</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_session_is_active</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_is_remote</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_state</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>state</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_uid</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>uid_t *<parameter>uid</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_username</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>username</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_seat</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>seat</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_start_time</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>uint64_t *<parameter>usec</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_service</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>service</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_type</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>type</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_class</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>class</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_desktop</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>desktop</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_display</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>display</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_leader</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>pid_t *<parameter>leader</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_remote_host</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>remote_host</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_remote_user</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>remote_user</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_tty</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>char **<parameter>tty</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_session_get_vt</function></funcdef> + <paramdef>const char *<parameter>session</parameter></paramdef> + <paramdef>unsigned int *<parameter>vt</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_session_is_active()</function> may be used to + determine whether the session identified by the specified session + identifier is currently active (i.e. currently in the foreground + and available for user input) or not.</para> + + <para><function>sd_session_is_remote()</function> may be used to + determine whether the session identified by the specified session + identifier is a remote session (i.e. its remote host is known) or + not.</para> + + <para><function>sd_session_get_state()</function> may be used to + determine the state of the session identified by the specified + session identifier. The following states are currently known: + <literal>online</literal> (session logged in, but session not + active, i.e. not in the foreground), <literal>active</literal> + (session logged in and active, i.e. in the foreground), + <literal>closing</literal> (session nominally logged out, but some + processes belonging to it are still around). In the future + additional states might be defined, client code should be written + to be robust in regards to additional state strings being + returned. This function is a more generic version of + <function>sd_session_is_active()</function>. 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_session_get_uid()</function> may be used to + determine the user identifier of the Unix user the session + identified by the specified session identifier belongs to.</para> + + <para><function>sd_session_get_username()</function> may be used to + determine the name of the Unix user the session identified by + the specified session identifier belongs to. 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_session_get_seat()</function> may be used to + determine the seat identifier of the seat the session identified + by the specified session identifier belongs to. Note that not all + sessions are attached to a seat, this call will fail (returning + <constant>-ENODATA</constant>) for them. 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_session_get_start_time()</function> may be used to + determine the start time of the session identified by the specified + session identifier belongs to. The <parameter>usec</parameter> + is in microseconds since the epoch (<constant>CLOCK_REALTIME</constant>).</para> + + <para><function>sd_session_get_service()</function> may be used to + determine the name of the service (as passed during PAM session + setup) that registered the session identified by the specified + session identifier. 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_session_get_type()</function> may be used to + determine the type of the session identified by the specified + session identifier. The returned string is one of + <literal>x11</literal>, <literal>wayland</literal>, + <literal>tty</literal>, <literal>mir</literal> or + <literal>unspecified</literal> and 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_session_get_class()</function> may be used to + determine the class of the session identified by the specified + session identifier. The returned string is one of + <literal>user</literal>, <literal>greeter</literal>, + <literal>lock-screen</literal>, or <literal>background</literal> + and 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_session_get_desktop()</function> may be used to + determine the brand of the desktop running on the session + identified by the specified session identifier. This field can be + set freely by desktop environments and does not follow any special + formatting. However, desktops are strongly recommended to use the + same identifiers and capitalization as for + <varname>$XDG_CURRENT_DESKTOP</varname>, as defined by the <ulink + url="https://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop + Entry Specification</ulink>. 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_session_get_display()</function> may be used to + determine the X11 display of the session identified by the + specified session identifier. 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_session_get_leader()</function> may be used to + determine the PID of the leader of the session identified by the + specified session identifier.</para> + + <para><function>sd_session_get_remote_host()</function> may be + used to determine the remote hostname of the session identified by + the specified session identifier. 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_session_get_remote_user()</function> may be + used to determine the remote username of the session identified by + the specified session identifier. The returned string needs to be + freed with the libc + <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> + call after use. Note that this value is rarely known to the + system, and even then should not be relied on.</para> + + <para><function>sd_session_get_tty()</function> may be used to + determine the TTY device of the session identified by the + specified session identifier. 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_session_get_vt()</function> may be used to + determine the VT number of the session identified by the specified + session identifier. This function will return an error if the seat + does not support VTs.</para> + + <para>If the <varname>session</varname> parameter of any of these + functions is passed as <constant>NULL</constant>, the operation is + executed for the session the calling process is a member of, if + there is any.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>If the test succeeds, + <function>sd_session_is_active()</function> and + <function>sd_session_is_remote()</function> return a + positive integer; if it fails, 0. On success, + <function>sd_session_get_state()</function>, + <function>sd_session_get_uid()</function>, + <function>sd_session_get_username()</function>, + <function>sd_session_get_seat()</function>, + <function>sd_session_get_service()</function>, + <function>sd_session_get_type()</function>, + <function>sd_session_get_class()</function>, + <function>sd_session_get_display()</function>, + <function>sd_session_get_leader()</function>, + <function>sd_session_get_remote_user()</function>, + <function>sd_session_get_remote_host()</function> and + <function>sd_session_get_tty()</function> return 0 or + a positive integer. On failure, these calls return a + negative errno-style error code.</para> + + <refsect2> + <title>Errors</title> + + <para>Returned errors may indicate the following problems:</para> + + <variablelist> + + <varlistentry> + <term><constant>-ENXIO</constant></term> + + <listitem><para>The specified session does not exist.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENODATA</constant></term> + + <listitem><para>The given field is not specified for the described session.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para>An input parameter was invalid (out of range, or <constant>NULL</constant>, where + that is not accepted).</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENOMEM</constant></term> + + <listitem><para>Memory allocation failed.</para></listitem> + </varlistentry> + </variablelist> + </refsect2> + </refsect1> + + <xi:include href="libsystemd-pkgconfig.xml" /> + + <refsect1> + <title>History</title> + <para><function>sd_session_get_state()</function> was added in version 186.</para> + <para><function>sd_session_get_tty()</function> was added in version 198.</para> + <para><function>sd_session_get_vt()</function> was added in version 207.</para> + <para><function>sd_session_is_remote()</function>, + <function>sd_session_get_remote_host()</function>, and + <function>sd_session_get_remote_user()</function> were added in version 209.</para> + <para><function>sd_session_get_desktop()</function> was added in version 217.</para> + <para><function>sd_session_get_username()</function>, + <function>sd_session_get_start_time()</function>, and + <function>sd_session_get_leader()</function> were added in version 254.</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_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |