journald: add support for wall forwarding

This will let journald forward logs as messages sent to all logged in
users (like wall).

Two options are added:
 * ForwardToWall (default yes)
 * MaxLevelWall (default emerg)
'ForwardToWall' is overridable by kernel command line option
'systemd.journald.forward_to_wall'.

This is used to emulate the traditional syslogd behaviour of sending
emergency messages to all logged in users.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index 868065075..f0117e742 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -1319,6 +1319,12 @@ static int server_parse_proc_cmdline(Server *s) {
                                 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
                         else
                                 s->forward_to_console = r;
+                } else if (startswith(word, "systemd.journald.forward_to_wall=")) {
+                        r = parse_boolean(word + 33);
+                        if (r < 0)
+                                log_warning("Failed to parse forward to wall switch %s. Ignoring.", word + 33);
+                        else
+                                s->forward_to_wall = r;
                 } else if (startswith(word, "systemd.journald"))
                         log_warning("Invalid systemd.journald parameter. Ignoring.");
         }
@@ -1466,11 +1472,13 @@ int server_init(Server *s) {
         s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
 
         s->forward_to_syslog = true;
+        s->forward_to_wall = true;
 
         s->max_level_store = LOG_DEBUG;
         s->max_level_syslog = LOG_DEBUG;
         s->max_level_kmsg = LOG_NOTICE;
         s->max_level_console = LOG_INFO;
+        s->max_level_wall = LOG_EMERG;
 
         memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
         memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));