login: introduce sd_pid_get_service()

1 files changed, 30 insertions, 10 deletions

diff --git a/man/sd_pid_get_session.xml b/man/sd_pid_get_session.xml
index 24e468015f..4086c5a826 100644
--- a/man/sd_pid_get_session.xml
+++ b/man/sd_pid_get_session.xml
@@ -44,8 +44,9 @@
 
         <refnamediv>
                 <refname>sd_pid_get_session</refname>
+                <refname>sd_pid_get_service</refname>
                 <refname>sd_pid_get_owner_uid</refname>
-                <refpurpose>Determine session or owner of a session of a specific PID</refpurpose>
+                <refpurpose>Determine session, service or owner of a session of a specific PID</refpurpose>
         </refnamediv>
 
         <refsynopsisdiv>
@@ -59,6 +60,12 @@
                         </funcprototype>
 
                         <funcprototype>
+                                <funcdef>int <function>sd_pid_get_service</function></funcdef>
+                                <paramdef>pid_t <parameter>pid</parameter></paramdef>
+                                <paramdef>char** <parameter>service</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>
@@ -75,11 +82,23 @@
                 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 and user processes that are shared
-                between multiple sessions of the same user). For
-                processes not being part of a login session this
-                function will fail. The returned string needs to be
-                freed with the libc
+                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><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+                call after use.</para>
+
+                <para><function>sd_pid_get_service()</function> may be
+                used to determine the system service identifier of a
+                process identified by the specified process
+                identifier. The service name is a short string,
+                suitable for usage in file system paths. Note that not
+                all processes are part of a service (e.g. user
+                processes, or kernel threads). For processes not being
+                part of a system service this function will fail. The
+                returned string needs to be freed with the libc
                 <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
                 call after use.</para>
 
@@ -106,10 +125,11 @@
         <refsect1>
                 <title>Notes</title>
 
-                <para>The <function>sd_pid_get_session()</function>
-                and <function>sd_pid_get_owner_uid()</function>
-                interfaces are available as shared library, which can
-                be compiled and linked to with the
+                <para>The <function>sd_pid_get_session()</function>,
+                <function>sd_pid_get_service()</function>, and
+                <function>sd_pid_get_owner_uid()</function> interfaces
+                are available as shared library, which can be compiled
+                and linked to with the
                 <literal>libsystemd-login</literal>
                 <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                 file.</para>