深度剖析WinPcap之(七)――获得与释放网络适配器设备列表（3）

1.3.3      pcap_freealldevs函数

函数pcap_freealldevs()释放 由函数pcap_findalldevs_ex()或pcap_findalldevs()返回的网络接口链表，函数参数 alldevs为所需释放链表。

函数的主要代码如下：

void pcap_freealldevs(pcap_if_t *alldevs)

{

     pcap_if_t *curdev, *nextdev;

     pcap_addr_t *curaddr, *nextaddr;

 

    /*遍历链表，释放各节点所占用的资源*/

     for (curdev = alldevs; curdev != NULL; curdev = nextdev) {

         nextdev = curdev->next;

 

         // 释放所有的地址所占的内存资源

         for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {

              nextaddr = curaddr->next;

              if (curaddr->addr)

                   free(curaddr->addr);

              if (curaddr->netmask)

                   free(curaddr->netmask);

              if (curaddr->broadaddr)

                   free(curaddr->broadaddr);

              if (curaddr->dstaddr)

                   free(curaddr->dstaddr);

              free(curaddr);

         }

 

         //释放接口的名字所占的内存资源

         free(curdev->name);

 

//释放接口的描述所占的内存资源   

         if (curdev->description != NULL)

              free(curdev->description);

 

           //释放该接口     

         free(curdev);

     }

}