Function plugin_add

sql/sql_plugin.cc:1121–1241

NOTE Requires that a write-lock is held on LOCK_system_variables_hash */

    Requires that a write-lock is held on LOCK_system_variables_hash
*/
static enum install_status plugin_add(MEM_ROOT *tmp_root, bool if_not_exists,
           const LEX_CSTRING *name, LEX_CSTRING *dl, myf MyFlags)
{
  struct st_plugin_int tmp, *maybe_dupe;
  struct st_maria_plugin *plugin;
  uint oks= 0, errs= 0, dupes= 0;
  DBUG_ENTER("plugin_add");
  DBUG_PRINT("enter", ("name: %s  dl: %s", name->str, dl->str));

  if (name->str && plugin_find_internal(name, MYSQL_ANY_PLUGIN))
  {
    if (if_not_exists)
      MyFlags|= ME_NOTE;
    my_error(ER_PLUGIN_INSTALLED, MyFlags, name->str);
    DBUG_RETURN(if_not_exists ? INSTALL_FAIL_WARN_OK : INSTALL_FAIL_NOT_OK);
  }
  /* Clear the whole struct to catch future extensions. */
  bzero((char*) &tmp, sizeof(tmp));
  fix_dl_name(tmp_root, dl);
  if (! (tmp.plugin_dl= plugin_dl_add(dl, MyFlags)))
    DBUG_RETURN(INSTALL_FAIL_NOT_OK);
  /* Find plugin by name */
  for (plugin= tmp.plugin_dl->plugins; plugin->info; plugin++)
  {
    tmp.name.str= (char *)plugin->name;
    tmp.name.length= strlen(plugin->name);

    if (plugin->type < 0 || plugin->type >= MYSQL_MAX_PLUGIN_TYPE_NUM)
      continue; // invalid plugin type

    if (plugin->type == MYSQL_UDF_PLUGIN ||
        (plugin->type == MariaDB_PASSWORD_VALIDATION_PLUGIN &&
         tmp.plugin_dl->mariaversion == 0))
      continue; // unsupported plugin type

    if (name->str && !Lex_ident_plugin(*name).streq(tmp.name))
      continue; // plugin name doesn't match

    if (!name->str &&
        (maybe_dupe= plugin_find_internal(&tmp.name, MYSQL_ANY_PLUGIN)))
    {
      if (plugin->name != maybe_dupe->plugin->name && !opt_silent_startup)
      {
        my_error(ER_UDF_EXISTS, MyFlags, plugin->name);
        DBUG_RETURN(INSTALL_FAIL_NOT_OK);
      }
      dupes++;
      continue; // already installed
    }
    struct st_plugin_int *tmp_plugin_ptr;
    if (*(int*)plugin->info <
        min_plugin_info_interface_version[plugin->type] ||
        ((*(int*)plugin->info) >> 8) >
        (cur_plugin_info_interface_version[plugin->type] >> 8))
    {
      char buf[256];
      strxnmov(buf, sizeof(buf) - 1, "API version for ",
               plugin_type_names[plugin->type].str,