/****************************************************************
*filename:myvm.c
*author:hemmingway
time:2012年05月25日 星期五 17時46分39秒
*compile with:gcc -g -Wall myvm.c -o myvm -lvirt
****************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <libvirt/libvirt.h>

#define MAXID 50

/*the data strucure of time*/
typedef struct _timeInfo
{
?long long cpu_time;
?struct timeval real_time;
}TIMEINFONODE;

/*the hypervisor connection*/
static virConnectPtr conn = NULL;

/*release the connecton of hypervisor*/
void closeConn()
{
?if(conn != NULL)
??virConnectClose(conn);
}

/*release the domain pointer*/
void freeDom(virDomainPtr dom)
{
?if(dom != NULL)
??virDomainFree(dom);
}

/*get start time of each domain*/
void getTimeInfo(int id,TIMEINFONODE *infos)
{
?virDomainPtr dom = NULL;
?virDomainInfo info;
?int ret;
?
?/*find the domain of the given id*/
?dom = virDomainLookupByID(conn,id);
?if(NULL == dom)
??{
???fprintf(stderr,"failed to find domain by id \'%d\'.\n",id);
???freeDom(dom);
???closeConn();
??}
??
?/*get the information of the domain*/
?ret = virDomainGetInfo(dom,&info);
?if(ret < 0)? /*-1 ?*/
??{
???fprintf(stderr,"failed to get informaton for domain \'%d\'.\n",id);
???freeDom(dom);
???closeConn();
??}
??
?/*retrive the start time*/
?if(gettimeofday(&(infos->real_time),NULL) == -1)
??{
???fprintf(stderr,"oh my god!failed to get start time.\n");
???return;
??}
?
?/**/
?infos->cpu_time = info.cpuTime;
?
?freeDom(dom);
}

void getDomainInfo(int id,TIMEINFONODE infos)
{
?virDomainPtr dom = NULL;
?virDomainInfo info;
?int ret;
?
?struct timeval realTime;
?int cpu_diff,real_diff;
?float usage;
?
??/*find the domain of the given id*/
?dom = virDomainLookupByID(conn,id);
?if(NULL == dom)
??{
???fprintf(stderr,"failed to find domain by id \'%d\'.\n",id);
???freeDom(dom);
???closeConn();
??}
??
?/*get the information of the domain*/
?ret = virDomainGetInfo(dom,&info);
?if(ret < 0)? /*-1 ?*/
??{
???fprintf(stderr,"failed to get informaton for domain \'%d\'.\n",id);
???freeDom(dom);
???closeConn();
??}
??
?/*retrive the start time*/
?if(gettimeofday(&(infos.real_time),NULL) == -1)
??{
???fprintf(stderr,"oh my god!failed to get start time.\n");
???return;
??}
??
??cpu_diff = (info.cpuTime - infos.cpu_time) / 10000;
??real_diff = 1000 * (realTime.tv_sec - infos.real_time.tv_sec) +
??????????? (realTime.tv_usec - infos.real_time.tv_usec);
??usage = cpu_diff / (float)(real_diff);
??
??printf("%d\t%.3f\t%lu\t%lu\t%d\t%0x\t%s\n",
?????id,usage,info.memory/1024,info.maxMem/1024,
????info.nrVirtCpu,info.state,virDomainGetName(dom));

??freeDom(dom);
}

int main()
{
?int idCount;
?int i;
?int id;
?int ids[MAXID];
?char *host;
?unsigned long ver;
?
?virNodeInfo nodeinfo;
?
?TIMEINFONODE timeInfos[MAXID];
?
?printf("----------------------------------------\n");
?printf("????? xen domain monitor vrsion 0.1???? \n");
?printf("????? build by somebody.??????????????? \n");
?printf("----------------------------------------\n");
?
?/*connect to local xen hypervisor*/
?conn = virConnectOpenReadOnly(NULL);
?if(conn == NULL)
??{
???fprintf(stderr,"failed to connect to xen hypervisor\n");
???closeConn();
???return 0;
??}

?host = virConnectGetHostname(conn);
?printf("Hostname:%s\n",host);

?printf("Virtualization type:%s\n",virConnectGetType(conn));
?virConnectGetVersion(conn, &ver);
?printf("Version:%lu\n",ver);

/*
?virConnectGetLibVersion(conn, &ver);
?printf("Libvirt Version:%lu\n",ver);
*/

?virNodeGetInfo(conn, &nodeinfo);
?printf("==========node info===============\n");
?printf("Model:%s\n",nodeinfo.model);
?printf("Memory:%lukb\n",nodeinfo.memory);?
?printf("Number of CPUs:%u\n",nodeinfo.cpus);
?printf("MHz:%u\n",nodeinfo.mhz);
?printf("Number of NUMA nodes:%u\n",nodeinfo.nodes);?
?printf("===============================\n");

?? idCount = virConnectListDomains(conn,&ids[0],MAXID);
?? if(idCount < 0)
?? ?{
???fprintf(stderr,"failed to list domains\n");
???closeConn();
???return 0;
??}
??

??printf("Domain Totals: %d\n", idCount);
??printf("ID\tCPU\tMEM\tMaxMEM\tVCPUs\tState\tNAME\n");??
??
???? /* loop get the CPUtime info by IDs */?
??for (i = 0; i < idCount; i++)
??{
???id = ids[i];
???getTimeInfo(id, &(timeInfos[i]));
??}
??
??sleep(1); //1 sec
??
??/* loop print the domain info and calculate the usage of cpus*/
??for (i = 0; i < idCount; i++)
??{
???id = ids[i];
???getDomainInfo(id, timeInfos[i]);
?????????????????????
??}
??
??printf("--------------------------------------------------------\n");
??closeConn();
??
? return 0;
}

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