Question

I look through a C source (pjsip) and I find this sctucture. I don’t know how to conceive.

static struct user_agent
{
    pjsip_module     mod;
    pj_pool_t       *pool;
    pjsip_endpoint  *endpt;
    pj_mutex_t      *mutex;
    pj_hash_table_t *dlg_table;
    pjsip_ua_init_param  param;
    struct dlg_set   free_dlgset_nodes;

} mod_ua = 
{
  {
    NULL, NULL,         /* prev, next.          */
    { "mod-ua", 6 },        /* Name.                */
    -1,             /* Id               */
    PJSIP_MOD_PRIORITY_UA_PROXY_LAYER,  /* Priority     */
    &mod_ua_load,       /* load()               */
    NULL,           /* start()              */
    NULL,           /* stop()               */
    &mod_ua_unload,     /* unload()             */
    &mod_ua_on_rx_request,  /* on_rx_request()          */
    &mod_ua_on_rx_response, /* on_rx_response()         */
    NULL,           /* on_tx_request.           */
    NULL,           /* on_tx_response()         */
    &mod_ua_on_tsx_state,   /* on_tsx_state()           */
  }
};

Answer 1

Not a particularly clear question but what I think you’re having a problem with is that the struct is being declared and used in the same statement. How about:

struct user_agent {
    ....
}

static struct user_agent mod_ua = ....

That any clearer?

K