#include <alarmd/alarm_event.h>
...
cookie_t *list;
list=alarm_event_query(time(NULL),time(NULL)+40,0,0);
...

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <alarmd/alarm_event.h>

int
main(int argc, char **argv)
{
        cookie_t *list, *iter;
        time_t now;

        now = time(NULL);
        list = alarm_event_query(now, now + 60, 0, 0);
        if (list == NULL) {
                fprintf(stderr, "alarm_event_query() failed\n");
                return EXIT_FAILURE;
        }

        if (list[0] == (cookie_t) 0) {
                printf("no alarms set\n");
        } else {
                printf("alarm ids:");
                for (iter = list; *iter != (cookie_t) 0; iter++) {
                        printf(" %u\n", (unsigned int) *iter);
                }
                printf("\n");
        }

        free(list);
        return EXIT_SUCCESS;
}

run-standalone.sh alarmd

#include <alarmd/libalarm.h>
#include <iostream>
#define APPID "example-apps"

cookie_t MyClass::addAlarmdJob(){
    cookie_t cookie = 0;
    alarm_event_t *eve = 0;
    alarm_action_t *act = 0;

    /* Create alarm event structure, set application
       * identifier and dialog message */
    eve = alarm_event_create();
    alarm_event_set_alarm_appid(eve, APPID);

    /* Use absolute time triggering, show dialog
       * ten seconds from now */
    eve->alarm_time = time(0) + 10;

    /* Add command*/
    act = alarm_event_add_actions(eve,1);
    act->flags |= ALARM_ACTION_WHEN_TRIGGERED;
    act->flags |= ALARM_ACTION_TYPE_EXEC;
    act->exec_command = "phone-control --notify Hello!";

    /* Send the alarm to alarmd */
    cookie = alarmd_event_add(eve);

    std::cout << cookie << std::endl;

    /* Free all dynamic memory associated with the*/
    //alarm_event_delete(eve); //<-- Invalid pointer exception
    return cookie;   //Cookie ID of event
}