mxshadowsrv: Reintroduce DEBUG_MAX_CONNECTS

mxshadowsrv.c

@@ -71,6 +71,9 @@ static struct stat statbuf;       // protected by shadow_mutex
 static SSL_CTX *ssl_ctx;
 static int listen_socket;
 static char *filename;
+#ifdef DEBUG_MAX_CONNECTS
+static int debug_remaining_connects = DEBUG_MAX_CONNECTS;
+#endif
 
 static void validate_shadow(char **shadow_buf, char *filename, struct stat *statbuf) {
     int status = pthread_mutex_lock(&shadow_mutex);
@@ -189,6 +192,10 @@ static void process_client(int socket) {
 static void *client_thread(void *arg) {
 
     while (1) {
+#ifdef DEBUG_MAX_CONNECTS
+        if ( __sync_fetch_and_sub(&debug_remaining_connects, 1) <= 0)
+            return NULL;
+#endif
         int _cleanup_(free_fd) socket = accept4(listen_socket, NULL, NULL, SOCK_NONBLOCK);
         if (socket == -1 ) { perror("accept"); exit(1); }
         validate_shadow(&shadow_buf, filename, &statbuf);