Keep FastCGI available during restarts

src/lib/sys.cpp

@@ -1549,6 +1549,12 @@ pid_t task(String key, std::function<void()> exec_after_spawn, u64 timeout)
 	{
 		close_locked_file(lock_fd);
 		my_pid = getpid();
+		// The FastCGI worker handles termination to drain accepted requests.
+		// Generic task children do not run that drain loop, so inheriting those
+		// handlers would turn task_kill(SIGTERM) into a no-op.
+		signal(SIGTERM, SIG_DFL);
+		signal(SIGINT, SIG_DFL);
+		signal(SIGHUP, SIG_DFL);
 		signal(SIGALRM, SIG_DFL);
 		if(timeout > 0)
 			alarm(timeout);