test libvirt

/****************************************************************
 *filename:myvm.c
 *author:hemmingway
 time:2012年05月25日 星期五 17时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;
 }