Function xlog_add_receiver

common/log/xlog.c:216–253

* append a log data receiver, return 0 if success. */

 * 	append a log data receiver, return 0 if success.
 */
XLOG_API int xlog_add_receiver(xlog_context* ctx, xlog_receive_callback rev, int *out_index)
{
    int i;

    if (ctx == NULL){
        return -1;
    }
    if (rev == NULL){
        strcpy(ctx->_error, "param @rev is null");
        return -1;
    }

    pthread_mutex_lock(&ctx->_mutext);

    for (i = 0; i < RECEIVER_MAX_COUNT; i++){
        if (ctx->_receivers[i]._fn == NULL)
            break;
    }

    if (i == RECEIVER_MAX_COUNT){
        strcpy(ctx->_error, "receiver count is full");
        pthread_mutex_unlock(&ctx->_mutext);
        return -1;
    }

    ctx->_receivers[i]._type = RECEIVER_TYPE_CALLBACK;
    ctx->_receivers[i]._rev = rev;
    ctx->_receivers[i]._fn = print_to_user_callback;
    ctx->_receivers[i]._enable = 1;
    ctx->_count++;

    if (out_index)
        *out_index = i;
    
    pthread_mutex_unlock(&ctx->_mutext);
    
    return 0;
}

/**
 * 	append a log data receiver, return 0 if success.