core: add new logic for services to store file descriptors in PID 1

With this change it is possible to send file descriptors to PID 1, via sd_pid_notify_with_fds() which PID 1 will store individually for each service, and pass via the usual fd passing logic on next invocation. This is useful for enable daemon reload schemes where daemons serialize their state to /run, push their fds into PID 1 and terminate, restoring their state on next start from the data in /run and passed in from PID 1. The fds are kept by PID 1 as long as no POLLHUP or POLLERR is seen on them, and the service they belong to are either not dead or failed, or have a job queued.
2015-01-06 03:16:39 +01:00
parent 7539904965
commit a354329f72
18 changed files with 598 additions and 104 deletions
@@ -1117,6 +1117,35 @@
                                command.</para></listitem>
                        </varlistentry>

+                        <varlistentry>
+                                <term><varname>FileDescriptorStoreMax=</varname></term>
+                                <listitem><para>Configure how many
+                                file descriptors may be stored in the
+                                service manager for the service using
+                                <citerefentry><refentrytitle>sd_pid_notify_with_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>'s
+                                <literal>FDSTORE=1</literal>
+                                messages. This is useful for
+                                implementing service restart schemes
+                                where the state is serialized to
+                                <filename>/run</filename> and the file
+                                descriptors passed to the service
+                                manager, to allow restarts without
+                                losing state. Defaults to 0, i.e. no
+                                file descriptors may be stored in the
+                                service manager by default. All file
+                                descriptors passed to the service
+                                manager from a specific service are
+                                passed back to the service's main
+                                process on the next service
+                                restart. Any file descriptors passed
+                                to the service manager are
+                                automatically closed when POLLHUP or
+                                POLLERR is seen on them, or when the
+                                service is fully stopped and no job
+                                queued or being executed for
+                                it.</para></listitem>
+                        </varlistentry>
+
                </variablelist>

                <para>Check