基於C語言libvirt API簡單小程式

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libvirt API簡單小程式

1、程式碼如下

#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;}

　　

2、程式編譯並運行，運行結果1所示

gcc dominfo.c -o dominfo -lvirt./dominfo

　　-lvirt指定程式連結時的共用庫，在本文實驗環境中依賴的共用庫檔案路徑為/usr/lib/libvirt.so

圖 1

將運行結果和virsh的啟動並執行結果相比較，virsh的結果2所示

圖 2

 

 

 

基於C語言libvirt API簡單小程式