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worker: Prevent any frozen worker processes by killing them on inactivity

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That is, introduced an alarm() call at the worker periodic check, which will
only get triggered if a very long timeout has occurred without the loop being
completed.
This commit is contained in:
Nikos Mavrogiannopoulos
2016-01-11 13:33:23 +01:00
parent 43d55261e6
commit 3eb2b903ed
1 changed files with 6 additions and 0 deletions
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6
src/worker-vpn.c
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@@ -773,6 +773,12 @@ int periodic_check(worker_st * ws, unsigned mtu_overhead, struct timespec *tnow,
if (now - ws->last_periodic_check < periodic_check_time)
return 0;
/* we set an alarm at each periodic check to prevent any
* freezes in the worker due to an unexpected block (due to worker
* bug or kernel bug). In that case the worker will be killed due
* the the alarm instead of hanging. */
alarm(1800);
if (ws->config->idle_timeout > 0) {
if (now - ws->last_nc_msg > ws->config->idle_timeout) {
oclog(ws, LOG_ERR,