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authorLennart Poettering <lennart@poettering.net>2012-04-05 22:08:10 +0200
committerLennart Poettering <lennart@poettering.net>2012-04-05 22:15:29 +0200
commite96d6be763014be75d480fde503d0b77f41194a0 (patch)
tree1bc3753e708c8b588c43ccd5b5c52c0adefc01c9 /src/shutdown.c
parent348e27fedfd4cdd2238ff31a46785a70b9dc6fc0 (diff)
systemd: add hardware watchdog support
This adds minimal hardware watchdog support to PID 1. The idea is that PID 1 supervises and watchdogs system services, while the hardware watchdog is used to supervise PID 1. This adds two hardware watchdog configuration options, for the runtime watchdog and for a shutdown watchdog. The former is active during normal operation, the latter only at reboots to ensure that if a clean reboot times out we reboot nonetheless. If the runtime watchdog is enabled PID 1 will automatically wake up at half the configured interval and write to the watchdog daemon. By default we enable the shutdown watchdog, but leave the runtime watchdog disabled in order not to break independent hardware watchdog daemons people might be using. This is only the most basic hookup. If necessary we can later on hook up the watchdog ping more closely with services deemed crucial.
Diffstat (limited to 'src/shutdown.c')
-rw-r--r--src/shutdown.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/src/shutdown.c b/src/shutdown.c
index d157e0fbfe..9f65b1dab0 100644
--- a/src/shutdown.c
+++ b/src/shutdown.c
@@ -42,6 +42,7 @@
#include "umount.h"
#include "util.h"
#include "virt.h"
+#include "watchdog.h"
#define TIMEOUT_USEC (5 * USEC_PER_SEC)
#define FINALIZE_ATTEMPTS 50
@@ -306,7 +307,7 @@ int main(int argc, char *argv[]) {
int cmd, r;
unsigned retries;
bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
- bool killed_everbody = false, in_container;
+ bool killed_everbody = false, in_container, use_watchdog = false;
log_parse_environment();
log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
@@ -342,6 +343,8 @@ int main(int argc, char *argv[]) {
goto error;
}
+ use_watchdog = !!getenv("WATCHDOG_USEC");
+
/* lock us into memory */
if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0)
log_warning("Cannot lock process memory: %m");
@@ -359,6 +362,9 @@ int main(int argc, char *argv[]) {
for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
bool changed = false;
+ if (use_watchdog)
+ watchdog_ping();
+
if (need_umount) {
log_info("Unmounting file systems.");
r = umount_all(&changed);