1.1 --- a/tests/dstest_block_client_simple.cc	Sun Aug 01 00:07:00 2021 +0200
     1.2 +++ b/tests/dstest_block_client_simple.cc	Sun Aug 01 00:23:08 2021 +0200
     1.3 @@ -23,6 +23,7 @@
     1.4  
     1.5  #include <stdio.h>
     1.6  #include <stdlib.h>
     1.7 +#include <string.h>
     1.8  
     1.9  #include <fsclient/client.h>
    1.10  
    1.11 @@ -39,13 +40,14 @@
    1.12    /* Obtain filename and access parameters. */
    1.13  
    1.14    char *filename = argv[1];
    1.15 -  sys_uid_t uid = argc > 2 ? atoi(argv[2]) : 0;
    1.16 +  bool have_uid = (argc > 2) && strlen(argv[2]);
    1.17 +  sys_uid_t uid = have_uid ? atoi(argv[2]) : 0;
    1.18    int repetition = argc > 3 ? atoi(argv[3]) : 10;
    1.19    file_t *file;
    1.20  
    1.21    /* With a user, open a user-specific file opener. */
    1.22  
    1.23 -  if (uid)
    1.24 +  if (have_uid)
    1.25    {
    1.26      l4_cap_idx_t opener = client_open_for_user((user_t) {uid, uid, 0022});
    1.27