From 652a44f9a9948a023fd7b26f72044fea0b13c25d Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 3 Nov 2015 12:28:19 +0100
Subject: [PATCH] journal: restore watchdog support
(cherry picked from commit 119e9655dc36f18ed74f9a256d5c693b5aeb43ab)
Conflicts:
src/journal/journald-server.h
units/systemd-journald.service.in
Related: #1511565
---
src/journal/journald-server.c | 62 ++++++++++++++++++++++++++++---
src/journal/journald-server.h | 13 ++++---
units/systemd-journald.service.in | 1 +
3 files changed, 66 insertions(+), 10 deletions(-)
diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index a810829b2..6e7568b60 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -1572,10 +1572,10 @@ static int dispatch_notify_event(sd_event_source *es, int fd, uint32_t revents,
}
/* The $NOTIFY_SOCKET is writable again, now send exactly one
- * message on it. Either it's the initial READY=1 event or an
- * stdout stream event. If there's nothing to write anymore,
- * turn our event source off. The next time there's something
- * to send it will be turned on again. */
+ * message on it. Either it's the wtachdog event, the initial
+ * READY=1 event or an stdout stream event. If there's nothing
+ * to write anymore, turn our event source off. The next time
+ * there's something to send it will be turned on again. */
if (!s->sent_notify_ready) {
static const char p[] =
@@ -1594,12 +1594,30 @@ static int dispatch_notify_event(sd_event_source *es, int fd, uint32_t revents,
s->sent_notify_ready = true;
log_debug("Sent READY=1 notification.");
+ } else if (s->send_watchdog) {
+
+ static const char p[] =
+ "WATCHDOG=1";
+
+ ssize_t l;
+
+ l = send(s->notify_fd, p, strlen(p), MSG_DONTWAIT);
+ if (l < 0) {
+ if (errno == EAGAIN)
+ return 0;
+
+ return log_error_errno(errno, "Failed to send WATCHDOG=1 notification message: %m");
+ }
+
+ s->send_watchdog = false;
+ log_debug("Sent WATCHDOG=1 notification.");
+
} else if (s->stdout_streams_notify_queue)
/* Dispatch one stream notification event */
stdout_stream_send_notify(s->stdout_streams_notify_queue);
/* Leave us enabled if there's still more to to do. */
- if (s->stdout_streams_notify_queue)
+ if (s->send_watchdog || s->stdout_streams_notify_queue)
return 0;
/* There was nothing to do anymore, let's turn ourselves off. */
@@ -1610,6 +1628,29 @@ static int dispatch_notify_event(sd_event_source *es, int fd, uint32_t revents,
return 0;
}
+static int dispatch_watchdog(sd_event_source *es, uint64_t usec, void *userdata) {
+ Server *s = userdata;
+ int r;
+
+ assert(s);
+
+ s->send_watchdog = true;
+
+ r = sd_event_source_set_enabled(s->notify_event_source, SD_EVENT_ON);
+ if (r < 0)
+ log_warning_errno(r, "Failed to turn on notify event source: %m");
+
+ r = sd_event_source_set_time(s->watchdog_event_source, usec + s->watchdog_usec / 2);
+ if (r < 0)
+ return log_error_errno(r, "Failed to restart watchdog event source: %m");
+
+ r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ON);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enable watchdog event source: %m");
+
+ return 0;
+}
+
static int server_connect_notify(Server *s) {
union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
@@ -1672,6 +1713,14 @@ static int server_connect_notify(Server *s) {
if (r < 0)
return log_error_errno(r, "Failed to watch notification socket: %m");
+ if (sd_watchdog_enabled(false, &s->watchdog_usec) > 0) {
+ s->send_watchdog = true;
+
+ r = sd_event_add_time(s->event, &s->watchdog_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + s->watchdog_usec/2, s->watchdog_usec*3/4, dispatch_watchdog, s);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add watchdog time event: %m");
+ }
+
/* This should fire pretty soon, which we'll use to send the
* READY=1 event. */
@@ -1689,6 +1738,8 @@ int server_init(Server *s) {
s->compress = true;
s->seal = true;
+ s->watchdog_usec = USEC_INFINITY;
+
s->sync_interval_usec = DEFAULT_SYNC_INTERVAL_USEC;
s->sync_scheduled = false;
@@ -1893,6 +1944,7 @@ void server_done(Server *s) {
sd_event_source_unref(s->sigint_event_source);
sd_event_source_unref(s->hostname_event_source);
sd_event_source_unref(s->notify_event_source);
+ sd_event_source_unref(s->watchdog_event_source);
sd_event_unref(s->event);
safe_close(s->syslog_fd);
diff --git a/src/journal/journald-server.h b/src/journal/journald-server.h
index e59ff35e2..f046fde83 100644
--- a/src/journal/journald-server.h
+++ b/src/journal/journald-server.h
@@ -78,6 +78,7 @@ struct Server {
sd_event_source *sigint_event_source;
sd_event_source *hostname_event_source;
sd_event_source *notify_event_source;
+ sd_event_source *watchdog_event_source;
JournalFile *runtime_journal;
JournalFile *system_journal;
@@ -133,14 +134,14 @@ struct Server {
MMapCache *mmap;
- bool dev_kmsg_readable;
+ struct udev *udev;
uint64_t *kernel_seqnum;
+ bool dev_kmsg_readable:1;
- struct udev *udev;
-
- bool sent_notify_ready;
- bool sync_scheduled;
+ bool send_watchdog:1;
+ bool sent_notify_ready:1;
+ bool sync_scheduled:1;
char machine_id_field[sizeof("_MACHINE_ID=") + 32];
char boot_id_field[sizeof("_BOOT_ID=") + 32];
@@ -149,6 +150,8 @@ struct Server {
/* Cached cgroup root, so that we don't have to query that all the time */
char *cgroup_root;
+ usec_t watchdog_usec;
+
size_t line_max;
};
diff --git a/units/systemd-journald.service.in b/units/systemd-journald.service.in
index c94c0bfba..0d1ea61fe 100644
--- a/units/systemd-journald.service.in
+++ b/units/systemd-journald.service.in
@@ -22,6 +22,7 @@ RestartSec=0
StandardOutput=null
FileDescriptorStoreMax=4224
CapabilityBoundingSet=CAP_SYS_ADMIN CAP_DAC_OVERRIDE CAP_SYS_PTRACE CAP_SYSLOG CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_CHOWN CAP_DAC_READ_SEARCH CAP_FOWNER CAP_SETUID CAP_SETGID CAP_MAC_OVERRIDE
+WatchdogSec=3min
# Increase the default a bit in order to allow many simultaneous
# services being run since we keep one fd open per service. Also, when