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cluster/zeromq: Handle EINTR at shutdown

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Read ::signal_val and early exit a DoPublish() in case termination
happened while blocked in inproc.send()
This commit is contained in:
Arne Welzel 2025-01-29 15:37:43 +01:00
parent 94ec3af2b0
commit 540d9da5ef
1 changed files with 17 additions and 1 deletions
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18
src/cluster/backend/zeromq/ZeroMQ.cc
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@ -25,6 +25,8 @@
#include "zeek/cluster/backend/zeromq/ZeroMQ-Proxy.h"
#include "zeek/util.h"
extern int signal_val;
namespace zeek {
namespace plugin::Zeek_Cluster_Backend_ZeroMQ {
@ -266,7 +268,21 @@ bool ZeroMQBackend::DoPublishEvent(const std::string& topic, const std::string&
// This should never fail, it will instead block
// when HWM is reached. I guess we need to see if
// and how this can happen :-/
main_inproc.send(parts[i], flags);
try {
main_inproc.send(parts[i], flags);
} catch ( zmq::error_t& err ) {
// If send() was interrupted and Zeek caught an interrupt or term signal,
// fail the publish as we're about to shutdown. There's nothing the user
// can do, but it indicates an overload situation as send() was blocking.
if ( err.num() == EINTR && (signal_val == SIGINT || signal_val == SIGTERM) ) {
zeek::reporter->Error("Failed publish() using ZeroMQ backend at shutdown: %s (signal_val=%d)",
err.what(), signal_val);
return false;
}
zeek::reporter->Error("Unexpected ZeroMQ::DoPublishEvent() error: %s", err.what());
return false;
}
}
return true;