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| author | Michael Olbrich <m.olbrich@pengutronix.de> | 2012-02-01 17:17:12 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2012-02-01 19:29:19 +0100 |
| commit | a6927d7ffc18c51fbb9940f5f1e89f5c7695ed63 (patch) | |
| tree | a56630fa33002013683a69126a2caec16ef31b6c /man/sd_notify.xml | |
| parent | logind: add GetSessionByPID() bus call (diff) | |
| download | systemd-a6927d7ffc18c51fbb9940f5f1e89f5c7695ed63.tar.xz systemd-a6927d7ffc18c51fbb9940f5f1e89f5c7695ed63.zip | |
service: add watchdog timestamp
This patch adds WatchdogTimestamp[Monotonic] to the systemd service
D-Bus API. The timestamp is updated to the current time when the
service calls 'sd_nofity("WATCHDOG=1\n")'.
Using a timestamp instead of an 'alive' flag has two advantages:
1. No timeout is needed to define when a service is no longer alive.
This simplifies both configuration (no timeout value) and
implementation (no timeout event).
2. It is more robust. A 'dead' service might not be detected should
systemd 'forget' to reset an 'alive' flag. It is much less likely
to get a valid new timestamp if a service died.
Diffstat (limited to 'man/sd_notify.xml')
| -rw-r--r-- | man/sd_notify.xml | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/man/sd_notify.xml b/man/sd_notify.xml index 020914607c..9797a5f801 100644 --- a/man/sd_notify.xml +++ b/man/sd_notify.xml @@ -151,6 +151,18 @@ itself. Example: "MAINPID=4711"</para></listitem> </varlistentry> + + <varlistentry> + <term>WATCHDOG=1</term> + + <listitem><para>Tells systemd to + update the watchdog timestamp. + Services using this feature should do + this in regular intervals. A watchdog + framework can use the timestamps to + detect failed + services.</para></listitem> + </varlistentry> </variablelist> <para>It is recommended to prefix variable names that |