How to pass global user defined structures to each callbacks libwebsockets C -

im not sure if related lws can't find way pass global structure holds values between callbacks . simple story have simple hashtable in c https://github.com/cgjones/android-system-core/blob/master/libcutils/hashmap.c

i try explain in example : have main :

//here define global  hashmap *users_map;  static struct lws_protocols protocols[] = {       {         "wsapi",         callback_wsapi,         sizeof(struct per_session_data__apigataway),         128,     } ,     { null, null, 0, 0 } /* terminator */ };  int main(int argc, char **argv) {     struct lws_context_creation_info info;      //here init hash map      users_map = hashmapcreate(10, str_hash_fn, str_eq);     memset(&info, 0, sizeof info);     info.port = server_port;     info.protocols = protocols;     ...     info.options = opts | lws_server_option_libuv;     context = lws_create_context(&info);     if (lws_uv_initloop(context, null, 0)) {         lwsl_err("lws_uv_initloop failed\n");         goto bail;     }     uv_timer_init(lws_uv_getloop(context, 0), &timeout_watcher);     uv_timer_start(&timeout_watcher, main_loop_count_callback, 1000, 1000);     lws_libuv_run(context, 0);     return 0; } 

and callback_wsapi c file removed allot of code show important stuff

//here set extern visible  extern hashmap *users_map;  int callback_iogame(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) {         unsigned char out[lws_pre + 512];     struct per_session_data__apigataway *pss =         (struct per_session_data__apigataway *)user;      switch (reason) {     case lws_callback_established:         break;     case lws_callback_server_writeable:     {            //here lossing scope , hashmap not initialized         int bfor2 = hashmapsize(users_map);         break;     }     case lws_callback_receive:     {         char* client_req_str;             client_req_str = (char*)in;          if (strncmp((const char *)client_req_str, "player\n",6) == 0)         {                 //on first request clinet works                  int bfor  = hashmapsize(users_map);                 hashmapput(users_map, pss->id, pss);                 int after = hashmapsize(users_map);         }         //only invoke callback client when baby client ready eat          lws_callback_on_writable(wsi);         break;     }             case lws_callback_filter_protocol_connection:          break;     case lws_callback_ws_peer_initiated_close:         break;     default:         break;     } 

so can hashmap in first request when gets : lws_callback_receive
losing scope .

questions :
1. how can make hashmap global callbacks ? supposed hold server total users .