Explicitly ignore SIGCHLD signal by sending it to an empty function so that

the boost_unit_test framework doesn't catch the signal when child processes exit

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@903008 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 17 insertions, 0 deletions

diff --git a/cpp/src/tests/ForkedBroker.cpp b/cpp/src/tests/ForkedBroker.cpp
index e1a96c8e90..7c81d303fc 100644
--- a/cpp/src/tests/ForkedBroker.cpp
+++ b/cpp/src/tests/ForkedBroker.cpp
@@ -89,11 +89,28 @@ bool isLogOption(const std::string& s) {
           );
 }
 
+namespace {
+    void ignore_signal(int)
+    {
+    }
+}
+
 void ForkedBroker::init(const Args& userArgs) {
     using qpid::ErrnoException;
     port = 0;
     int pipeFds[2];
     if(::pipe(pipeFds) < 0) throw ErrnoException("Can't create pipe");
+
+    // Ignore the SIGCHLD signal generated by an exitting child
+    // We will clean up any exitting children in the waitpid above
+    // This should really be neater (like only once not per fork)
+    struct ::sigaction sa;
+    sa.sa_handler = ignore_signal;
+    ::sigemptyset(&sa.sa_mask);
+    ::sigaddset(&sa.sa_mask, SIGCHLD);
+    sa.sa_flags = SA_NOCLDSTOP | SA_RESTART;
+    ::sigaction(SIGCHLD, &sa, 0);
+
     pid = ::fork();
     if (pid < 0) throw ErrnoException("Fork failed");
     if (pid) {              // parent