libvirt获取虚拟机的状态

来源：互联网发布：黑之宣告知乎编辑：程序博客网时间：2024/06/07 00:04

最近需要获取虚拟机内CPU的利用率：尝试了多种方法，均不理想，以下是最后利用libvirt-devel开发包，实现一个功能函数。

示例如下：

<span style="font-size:18px;color:#009900;"><strong>#include <stdio.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <sys/time.h>#include <libvirt/libvirt.h>#include <libvirt/virterror.h>#define NAME_SIZE 32struct kvm_state{char name[NAME_SIZE];char rflags[16];// running  shutoffint  mem;      //MBint vcpus;float  cpu_rate;     // long long h_cpu_time;struct timeval h_real_time;};void s_to_rflags(int state,char*buf){switch(state){case 1: // runningstrcpy(buf,"running");break;case 2:  //blockedstrcpy(buf,"block");break;case 3: // pausedstrcpy(buf,"paused");break;case 4: //shut down strcpy(buf,"shut down");break;case 5:  // shut offstrcpy(buf,"shut off");break;case 6:  // crashedstrcpy(buf,"crashed");break;case 7: // suspendedstrcpy(buf,"suspended");break;default: // nonestrcpy(buf,"none");break;}return ;}int GetAllDomainState(struct kvm_state*st){virConnectPtr conn;    virDomainPtr *alldomain=NULL;virDomainInfo domain_info;    int num=0,i=0;struct timeval tv;    conn = virConnectOpen("qemu:///system");    if (conn == NULL) {        fprintf(stderr, "Failed to open connection to qemu+tcp://localhost/system\n");        return 0;    }num=virConnectListAllDomains(conn,&alldomain,3);// //st=(struct kvm_state*)malloc(sizeof(struct kvm_state)*num);//memset(st,0,sizeof(struct kvm_state)*num);    for(i=0;i<num;i++){   strncpy(st[i].name,virDomainGetName(alldomain[i]),NAME_SIZE);   // name//printf(":%s\n",virDomainGetXMLDesc(alldomain[i],1));virDomainGetInfo(alldomain[i],&domain_info);s_to_rflags(domain_info.state, st[i].rflags);// running statest[i].mem=domain_info.memory/1024;//mem /mb//domain_info.mexMemst[i].vcpus=domain_info.nrVirtCpu;// vcpusst[i].h_cpu_time=domain_info.cpuTime;gettimeofday(&(st[i].h_real_time),NULL);        //virDomainFree(alldomain[i]);    }sleep(1);for(i=0;i<num;i++){virDomainGetInfo(alldomain[i],&domain_info);gettimeofday(&tv,NULL);st[i].cpu_rate=((domain_info.cpuTime-st[i].h_cpu_time)/1000.0)/((tv.tv_sec-st[i].h_real_time.tv_sec)*1000000.0   + (tv.tv_usec- st[i].h_real_time.tv_usec));st[i].cpu_rate=st[i].cpu_rate/st[i].vcpus*100.0;virDomainFree(alldomain[i]);}    virConnectClose(conn);return num;}int main(){int num;struct kvm_state kvm[10];num=GetAllDomainState(kvm);}</strong></span>

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