Moved SIGCHLD handler out of mongoose.c. Embedded user must set SIGCHLD handler if CGI is used.

build/main.c

@@ -375,6 +375,11 @@ static void start_mongoose(int argc, char *argv[]) {
   signal(SIGTERM, signal_handler);
   signal(SIGINT, signal_handler);
 
+#if !defined(_WIN32)
+  // Also ignoring SIGCHLD to let the OS to reap zombies properly.
+  (void) signal(SIGCHLD, SIG_IGN);
+#endif
+
   // Start Mongoose
   memset(&callbacks, 0, sizeof(callbacks));
   callbacks.log_message = &log_message;

mongoose.c

@@ -5452,8 +5452,6 @@ struct mg_context *mg_start(const struct mg_callbacks *callbacks,
   // Ignore SIGPIPE signal, so if browser cancels the request, it
   // won't kill the whole process.
   (void) signal(SIGPIPE, SIG_IGN);
-  // Also ignoring SIGCHLD to let the OS to reap zombies properly.
-  (void) signal(SIGCHLD, SIG_IGN);
 #endif // !_WIN32
 
   (void) pthread_mutex_init(&ctx->mutex, NULL);

mongoose.h

@@ -142,10 +142,12 @@ struct mg_callbacks {
 //   options: NULL terminated list of option_name, option_value pairs that
 //            specify Mongoose configuration parameters.
 //
-// Side-effects: on UNIX, ignores SIGCHLD and SIGPIPE signals. If custom
-//    processing is required for these, signal handlers must be set up
+// Side-effects: on UNIX, ignores SIGPIPE signals. If custom
+//    processing is required SIGPIPE, signal handler must be set up
 //    after calling mg_start().
 //
+// Important: Mongoose does not install SIGCHLD handler. If CGI is used,
+// SIGCHLD handler must be set up to reap CGI zombie processes.
 //
 // Example:
 //   const char *options[] = {