1 files changed, 16 insertions, 0 deletions
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index f7ce48c..d633301 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -1389,9 +1389,25 @@ PyOS_InterruptOccurred(void)
     return 0;
 }
 
+static void
+_clear_pending_signals(void)
+{
+    int i;
+    if (!is_tripped)
+        return;
+    is_tripped = 0;
+    for (i = 1; i < NSIG; ++i) {
+        Handlers[i].tripped = 0;
+    }
+}
+
 void
 PyOS_AfterFork(void)
 {
+    /* Clear the signal flags after forking so that they aren't handled
+     * in both processes if they came in just before the fork() but before
+     * the interpreter had an opportunity to call the handlers.  issue9535. */
+    _clear_pending_signals();
 #ifdef WITH_THREAD
     /* PyThread_ReInitTLS() must be called early, to make sure that the TLS API
      * can be called safely. */