X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=man%2Fsd_notify.xml;h=f3f3269769bdee77fd56f301a63d81444c013df0;hb=84119b0353e5a11fecde843baa7c7bf83dccf617;hp=ae6792dd708185650163e9c2239edac8e8173b73;hpb=9270bff168ecc98d1761a32ca28b1f3906b093f2;p=elogind.git

diff --git a/man/sd_notify.xml b/man/sd_notify.xml
index ae6792dd7..f3f326976 100644
--- a/man/sd_notify.xml
+++ b/man/sd_notify.xml
@@ -268,6 +268,15 @@
     <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
     for details.</para>
 
+    <para>Note that <function>sd_notify()</function> notifications may be attributed to units correctly only if either
+    the sending process is still around at the time PID 1 processes the message, or if the sending process is
+    explicitly runtime-tracked by the service manager. The latter is the case if the service manager originally forked
+    off the process, i.e. on all processes that match <varname>NotifyAccess=</varname><option>main</option> or
+    <varname>NotifyAccess=</varname><option>exec</option>. Conversely, if an auxiliary process of the unit sends an
+    <function>sd_notify()</function> message and immediately exits, the service manager might not be able to properly
+    attribute the message to the unit, and thus will ignore it, even if
+    <varname>NotifyAccess=</varname><option>all</option> is set for it.</para>
+
     <para><function>sd_notifyf()</function> is similar to
     <function>sd_notify()</function> but takes a
     <function>printf()</function>-like format string plus