MDEV-5995 MySQL Bug#12750920: EMBEDDED SERVER START/STOP.

Some variables weren't cleared properly so consequitive embedded server start/stop failed.
  Cleanups added. Also mysql_client_test.c extended to test that (taken from Mattias Johnson's patch)

sql/mysqld.cc

@@ -2049,6 +2049,7 @@ void clean_up(bool print_message)
   free_global_table_stats();
   free_global_index_stats();
   delete_dynamic(&all_options);
+  free_all_rpl_filters();
 #ifdef HAVE_REPLICATION
   end_slave_list();
 #endif
@@ -2091,6 +2092,13 @@ void clean_up(bool print_message)
   mysql_mutex_unlock(&LOCK_thread_count);
 
   free_list(opt_plugin_load_list_ptr);
+
+  if (THR_THD)
+    (void) pthread_key_delete(THR_THD);
+
+  if (THR_MALLOC)
+    (void) pthread_key_delete(THR_MALLOC);
+
   /*
     The following lines may never be executed as the main thread may have
     killed us

tests/mysql_client_fw.c

@@ -59,6 +59,7 @@ static MYSQL *mysql= 0;
 static char current_db[]= "client_test_db";
 static unsigned int test_count= 0;
 static unsigned int opt_count= 0;
+static unsigned int opt_count_read= 0;
 static unsigned int iter_count= 0;
 static my_bool have_innodb= FALSE;
 static char *opt_plugin_dir= 0, *opt_default_auth= 0;
@@ -69,6 +70,9 @@ static const char *opt_vardir= "mysql-test/var";
 
 static longlong opt_getopt_ll_test= 0;
 
+static char **defaults_argv;
+static int   original_argc;
+static char **original_argv;
 static int embedded_server_arg_count= 0;
 static char *embedded_server_args[MAX_SERVER_ARGS];
 
@@ -112,6 +116,7 @@ DBUG_PRINT("test", ("name: %s", str));					\
 static void print_error(const char *msg);
 static void print_st_error(MYSQL_STMT *stmt, const char *msg);
 static void client_disconnect(MYSQL* mysql);
+static void get_options(int *argc, char ***argv);
 
 
 /*
@@ -273,7 +278,7 @@ static my_bool check_have_innodb(MYSQL *conn)
   MYSQL_RES *res;
   MYSQL_ROW row;
   int rc;
-  my_bool result;
+  my_bool result= FALSE;
 
   rc= mysql_query(conn, 
                   "SELECT (support = 'YES' or support = 'DEFAULT' or support = 'ENABLED') "
@@ -285,7 +290,8 @@ static my_bool check_have_innodb(MYSQL *conn)
   row= mysql_fetch_row(res);
   DIE_UNLESS(row);
 
-  result= strcmp(row[1], "1") == 0;
+  if (row[0] && row[1])
+    result= strcmp(row[1], "1") == 0;
   mysql_free_result(res);
   return result;
 }
@@ -1181,8 +1187,8 @@ static struct my_option client_test_long_options[] =
 {
   {"basedir", 'b', "Basedir for tests.", &opt_basedir,
    &opt_basedir, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
-  {"count", 't', "Number of times test to be executed", &opt_count,
-   &opt_count, 0, GET_UINT, REQUIRED_ARG, 1, 0, 0, 0, 0, 0},
+  {"count", 't', "Number of times test to be executed", &opt_count_read,
+   &opt_count_read, 0, GET_UINT, REQUIRED_ARG, 1, 0, 0, 0, 0, 0},
   {"database", 'D', "Database to use", &opt_db, &opt_db,
    0, GET_STR_ALLOC, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"do-not-drop-database", 'd', "Do not drop database while disconnecting",
@@ -1338,6 +1344,10 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
 static void get_options(int *argc, char ***argv)
 {
   int ho_error;
+  /* Copy argv from load_defaults, so we can free it when done. */
+  defaults_argv= *argv;
+  /* reset --silent option */
+  opt_silent= 0;
 
   if ((ho_error= handle_options(argc, argv, client_test_long_options,
                                 get_one_option)))
@@ -1359,9 +1369,12 @@ static void print_test_output()
     fprintf(stdout, "\n\n");
     fprintf(stdout, "All '%d' tests were successful (in '%d' iterations)",
             test_count-1, opt_count);
-    fprintf(stdout, "\n  Total execution time: %g SECS", total_time);
-    if (opt_count > 1)
-      fprintf(stdout, " (Avg: %g SECS)", total_time/opt_count);
+    if (!opt_silent)
+    {
+      fprintf(stdout, "\n  Total execution time: %g SECS", total_time);
+      if (opt_count > 1)
+        fprintf(stdout, " (Avg: %g SECS)", total_time/opt_count);
+    }
 
     fprintf(stdout, "\n\n!!! SUCCESS !!!\n");
   }
@@ -1374,16 +1387,37 @@ static void print_test_output()
 
 int main(int argc, char **argv)
 {
+  int i;
+  char **tests_to_run= NULL, **curr_test;
   struct my_tests_st *fptr;
   my_testlist= get_my_tests();
 
   MY_INIT(argv[0]);
+  /* Copy the original arguments, so it can be reused for restarting. */
+  original_argc= argc;
+  original_argv= malloc(argc * sizeof(char*));
+  if (argc && !original_argv)
+    exit(1);
+  for (i= 0; i < argc; i++)
+    original_argv[i]= strdup(argv[i]);
 
   if (load_defaults("my", client_test_load_default_groups, &argc, &argv))
     exit(1);
 
-  defaults_argv= argv;
   get_options(&argc, &argv);
+  /* Set main opt_count. */
+  opt_count= opt_count_read;
+
+  /* If there are any arguments left (named tests), save them. */
+  if (argc)
+  {
+    tests_to_run= malloc((argc + 1) * sizeof(char*));
+    if (!tests_to_run)
+      exit(1);
+    for (i= 0; i < argc; i++)
+      tests_to_run[i]= strdup(argv[i]);
+    tests_to_run[i]= NULL;
+  }
 
   if (mysql_server_init(embedded_server_arg_count,
                         embedded_server_args,
@@ -1399,18 +1433,18 @@ int main(int argc, char **argv)
     /* Start of tests */
     test_count= 1;
     start_time= time((time_t *)0);
-    if (!argc)
+    if (!tests_to_run)
     {
       for (fptr= my_testlist; fptr->name; fptr++)
         (*fptr->function)();	
     }
     else
     {
-      for ( ; *argv ; argv++)
+      for (curr_test= tests_to_run ; *curr_test ; curr_test++)
       {
         for (fptr= my_testlist; fptr->name; fptr++)
         {
-          if (!strcmp(fptr->name, *argv))
+          if (!strcmp(fptr->name, *curr_test))
           {
             (*fptr->function)();
             break;
@@ -1423,6 +1457,7 @@ int main(int argc, char **argv)
                   my_progname);
           client_disconnect(mysql);
           free_defaults(defaults_argv);
+          mysql_server_end();
           exit(1);
         }
       }
@@ -1446,5 +1481,18 @@ int main(int argc, char **argv)
 
   my_end(0);
 
+  for (i= 0; i < original_argc; i++)
+    free(original_argv[i]);
+  if (original_argc)
+    free(original_argv);
+  if (tests_to_run)
+  {
+    for (curr_test= tests_to_run ; *curr_test ; curr_test++)
+      free(*curr_test);
+    free(tests_to_run);
+  }
+  my_free(opt_password);
+  my_free(opt_host);
+
   exit(0);
 }

tests/mysql_client_test.c

@@ -6996,6 +6996,118 @@ static void test_set_option()
   mysql_stmt_close(stmt);
 }
 
+#ifdef EMBEDDED_LIBRARY
+static void test_embedded_start_stop()
+{
+  MYSQL *mysql_emb=NULL;
+  int i, j;
+  int argc= original_argc;                    // Start with the original args
+  char **argv, **my_argv;
+  char test_name[]= "test_embedded_start_stop";
+#define EMBEDDED_RESTARTS 64
+
+  myheader("test_embedded_start_stop");
+
+  /* Must stop the main embedded server, since we use the same config. */
+  client_disconnect(mysql);    /* disconnect from server */
+  free_defaults(defaults_argv);
+  mysql_server_end();
+  /* Free everything allocated by my_once_alloc */
+  my_end(0);
+
+  /*
+    Use a copy of the original arguments.
+    The arguments will be altered when reading the configs and parsing
+    options.
+  */
+  my_argv= malloc((argc + 1) * sizeof(char*));
+  if (!my_argv)
+    exit(1);
+
+  /* Test restarting the embedded library many times. */
+  for (i= 1; i <= EMBEDDED_RESTARTS; i++)
+  {
+    argv= my_argv;
+    argv[0]= test_name;
+    for (j= 1; j < argc; j++)
+      argv[j]= original_argv[j];
+
+    /* Initialize everything again. */
+    MY_INIT(argv[0]);
+
+    /* Load the client defaults from the .cnf file[s]. */
+    if (load_defaults("my", client_test_load_default_groups, &argc, &argv))
+    {
+      myerror("load_defaults failed"); 
+      exit(1);
+    }
+
+    /* Parse the options (including the ones given from defaults files). */
+    get_options(&argc, &argv);
+
+    /* mysql_library_init is the same as mysql_server_init. */
+    if (mysql_library_init(embedded_server_arg_count,
+                           embedded_server_args,
+                           (char**) embedded_server_groups))
+    {
+      myerror("mysql_library_init failed"); 
+      exit(1);
+    }
+
+    /* Create a client connection. */
+    if (!(mysql_emb= mysql_client_init(NULL)))
+    {
+      myerror("mysql_client_init failed");
+      exit(1);
+    }
+
+    /* Connect it and see if we can use the database. */
+    if (!(mysql_real_connect(mysql_emb, opt_host, opt_user,
+                             opt_password, current_db, 0,
+                             NULL, 0)))
+    {
+      myerror("mysql_real_connect failed");
+    }
+
+    /* Close the client connection */
+    mysql_close(mysql_emb);
+    mysql_emb = NULL;
+    /* Free arguments allocated for defaults files. */
+    free_defaults(defaults_argv);
+    /* mysql_library_end is a define for mysql_server_end. */
+    mysql_library_end();
+    /* Free everything allocated by my_once_alloc */
+    my_end(0);
+  }
+
+  argc= original_argc;
+  argv= my_argv;
+  argv[0]= test_name;
+  for (j= 1; j < argc; j++)
+    argv[j]= original_argv[j];
+
+  MY_INIT(argv[0]);
+
+  if (load_defaults("my", client_test_load_default_groups, &argc, &argv))
+  {
+    myerror("load_defaults failed \n "); 
+    exit(1);
+  }
+
+  get_options(&argc, &argv);
+
+  /* Must start the main embedded server again after the test. */
+  if (mysql_server_init(embedded_server_arg_count,
+                        embedded_server_args,
+                        (char**) embedded_server_groups))
+    DIE("Can't initialize MySQL server");
+
+  /* connect to server with no flags, default protocol, auto reconnect true */
+  mysql= client_connect(0, MYSQL_PROTOCOL_DEFAULT, 1);
+  free(my_argv);
+}
+#endif /* EMBEDDED_LIBRARY */
+
 
 /*
   Test a misc GRANT option
@@ -19148,6 +19260,9 @@ static struct my_tests_st my_tests[]= {
   { "test_view_sp_list_fields", test_view_sp_list_fields },
   { "client_query", client_query },
   { "test_prepare_insert_update", test_prepare_insert_update},
+#ifdef EMBEDDED_LIBRARY
+  { "test_embedded_start_stop", test_embedded_start_stop },
+#endif
 #if NOT_YET_WORKING
   { "test_drop_temp", test_drop_temp },
 #endif
@@ -19226,6 +19341,7 @@ static struct my_tests_st my_tests[]= {
   { "test_set_option", test_set_option },
 #ifndef EMBEDDED_LIBRARY
   { "test_prepare_grant", test_prepare_grant },
+
 #endif
   { "test_frm_bug", test_frm_bug },
   { "test_explain_bug", test_explain_bug },