Micro optimizations

native/jni/daemon/daemon.cpp

@@ -132,6 +132,20 @@ static void main_daemon() {
 	}
 }
 
+int switch_mnt_ns(int pid) {
+	char mnt[32];
+	snprintf(mnt, sizeof(mnt), "/proc/%d/ns/mnt", pid);
+	if(access(mnt, R_OK) == -1) return 1; // Maybe process died..
+
+	int fd, ret;
+	fd = xopen(mnt, O_RDONLY);
+	if (fd < 0) return 1;
+	// Switch to its namespace
+	ret = xsetns(fd, 0);
+	close(fd);
+	return ret;
+}
+
 int connect_daemon() {
 	struct sockaddr_un sun;
 	socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);