#include<stdio.h>

#include<libvirt/libvirt.h>

int getDomainInfo(int id) {

	virConnectPtr conn = NULL;

	virDomainPtr dom = NULL;

	virDomainInfo info;

	conn = virConnectOpenReadOnly(NULL);

	if (conn == NULL) {

		fprintf(stderr, "Failed to connect to hypervisor\n");

		return 1;

	}

	dom = virDomainLookupByID(conn, id);

	if (dom == NULL) {

		fprintf(stderr, "Failed to find Domain %d\n", id);

		virConnectClose(conn);

		return 1;

	}

	if (virDomainGetInfo(dom, &info) < 0) {

		fprintf(stderr, "Failed to get information for Domain %d\n", id);

		virDomainFree(dom);

		virConnectClose(conn);

		return 1;

	}

	printf("Domain ID: %d\n", id);

	printf("    vCPUs: %d\n", info.nrVirtCpu);

	printf("    maxMem: %d KB\n", info.maxMem);

	printf("    memory: %d KB\n", info.memory);

	if (dom != NULL){

		virDomainFree(dom);

	}

	if (conn != NULL){

		virConnectClose(conn);

	}

	return 0;

}

int main(int argc, char **argv)

{

	int dom_id = 3;

	printf("-----Get domain info by ID via libvirt C API -----\n");

	getDomainInfo(dom_id);

	return 0;

}

gcc dominfo.c -o dominfo -lvirt

./dominfo