From 253ee27a0c7a410d27d490bb79ea97caed6a2b68 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sat, 23 Jul 2011 04:15:38 +0200
Subject: [PATCH] manager: add log control via RT signals


---
[hand-edited to remove unrelated TODO edits -- michich]

diff --git a/man/systemd.xml b/man/systemd.xml
index 142c1d6..5129fbb 100644
--- a/man/systemd.xml
+++ b/man/systemd.xml
@@ -800,6 +800,44 @@
                                 on the kernel command
                                 line.</para></listitem>
                         </varlistentry>
+
+                        <varlistentry>
+                                <term>SIGRTMIN+22</term>
+                                <term>SIGRTMIN+23</term>
+
+                                <listitem><para>Sets the log level to
+                                <literal>debug</literal>
+                                (resp. <literal>info</literal> on
+                                <literal>SIGRTMIN+32</literal>), as
+                                controlled via
+                                <varname>systemd.log_level=debug</varname>
+                                (resp. <varname>systemd.log_level=info</varname>
+                                on <literal>SIGRTMIN+23</literal>) on
+                                the kernel command
+                                line.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term>SIGRTMIN+27</term>
+                                <term>SIGRTMIN+28</term>
+                                <term>SIGRTMIN+29</term>
+
+                                <listitem><para>Sets the log level to
+                                <literal>console</literal>
+                                (resp. <literal>kmsg</literal> on
+                                <literal>SIGRTMIN+28</literal>;
+                                resp.<literal>syslog-or-kmsg</literal>
+                                on <literal>SIGRTMIN+29</literal>), as
+                                controlled via
+                                <varname>systemd.log_target=console</varname>
+                                (resp. <varname>systemd.log_target=kmsg</varname>
+                                on <literal>SIGRTMIN+28</literal>;
+                                resp
+                                <varname>systemd.log_target=syslog-or-kmsg</varname>
+                                on <literal>SIGRTMIN+29</literal>) on
+                                the kernel command
+                                line.</para></listitem>
+                        </varlistentry>
                 </variablelist>
         </refsect1>
 
diff --git a/src/manager.c b/src/manager.c
index c1242ae..cdd618e 100644
--- a/src/manager.c
+++ b/src/manager.c
@@ -186,6 +186,11 @@ static int manager_setup_signals(Manager *m) {
                         SIGRTMIN+16, /* systemd: Immediate kexec */
                         SIGRTMIN+20, /* systemd: enable status messages */
                         SIGRTMIN+21, /* systemd: disable status messages */
+                        SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
+                        SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
+                        SIGRTMIN+27, /* systemd: set log target to console */
+                        SIGRTMIN+28, /* systemd: set log target to kmsg */
+                        SIGRTMIN+29, /* systemd: set log target to syslog-or-kmsg */
                         -1);
         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 
@@ -2200,6 +2205,7 @@ static int manager_process_signal_fd(Manager *m) {
                         break;
 
                 default: {
+
                         /* Starting SIGRTMIN+0 */
                         static const char * const target_table[] = {
                                 [0] = SPECIAL_DEFAULT_TARGET,
@@ -2244,6 +2250,31 @@ static int manager_process_signal_fd(Manager *m) {
                                 m->show_status = false;
                                 break;
 
+                        case 22:
+                                log_set_max_level(LOG_DEBUG);
+                                log_notice("Setting log level to debug.");
+                                break;
+
+                        case 23:
+                                log_set_max_level(LOG_INFO);
+                                log_notice("Setting log level to info.");
+                                break;
+
+                        case 27:
+                                log_set_target(LOG_TARGET_CONSOLE);
+                                log_notice("Setting log target to console.");
+                                break;
+
+                        case 28:
+                                log_set_target(LOG_TARGET_KMSG);
+                                log_notice("Setting log target to kmsg.");
+                                break;
+
+                        case 29:
+                                log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
+                                log_notice("Setting log target to syslog-or-kmsg.");
+                                break;
+
                         default:
                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
                         }
-- 
1.7.4.4