don't get blocked on zombies

1 files changed, 7 insertions, 0 deletions

diff --git a/mteval/external_scorer.cc b/mteval/external_scorer.cc
index f1b3ed6e..c7c3de1a 100644
--- a/mteval/external_scorer.cc
+++ b/mteval/external_scorer.cc
@@ -4,6 +4,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <unistd.h>
+#include <signal.h>
 #include <sstream>
 #include <iostream>
 #include <cassert>
@@ -15,6 +16,7 @@
 using namespace std;
 
 extern const char* meteor_jar_path;
+extern void metric_child_signal_handler(int);
 
 map<string, boost::shared_ptr<ScoreServer> > ScoreServerManager::servers_;
 
@@ -46,6 +48,11 @@ ScoreServer* ScoreServerManager::Instance(const string& score_type) {
 }
 
 ScoreServer::ScoreServer(const string& cmd) {
+  static bool need_init = true;
+  if (need_init) {
+    need_init = false;
+    signal(SIGCHLD, metric_child_signal_handler);
+  }
   cerr << "Invoking " << cmd << " ..." << endl;
   if (pipe(p2c) < 0) { perror("pipe"); exit(1); }
   if (pipe(c2p) < 0) { perror("pipe"); exit(1); }