struct ifconf和struct ifreq,獲取網線插入狀態
睿豐德科技 專注RFID識別技術和條碼識別技術與管理軟件的集成項目。質量追溯系統、MES系統、金蝶與條碼系統對接、用友與條碼系統對接
這兩天看用C獲取當前網口的插入網線狀態的程序,遇見了這兩個不熟悉的結構體,看了頭文件中的說明和詳細。
struct ifreq
這個結構定義在include/net/if.h,用來配置ip地址,激活接口,配置MTU等接口信息的
[cpp] view plaincopy
- /* Interface request structure used for socket ioctl's. All interface
- ioctl's must have parameter definitions which begin with ifr_name.
- The remainder may be interface specific. */
- struct ifreq
- {
- # define IFHWADDRLEN 6
- # define IFNAMSIZ IF_NAMESIZE
- union
- {
- char ifrn_name[IFNAMSIZ]; /* Interface name, e.g. "en0". */
- } ifr_ifrn;
- union
- {
- struct sockaddr ifru_addr;
- struct sockaddr ifru_dstaddr;
- struct sockaddr ifru_broadaddr;
- struct sockaddr ifru_netmask;
- struct sockaddr ifru_hwaddr;
- short int ifru_flags;
- int ifru_ivalue;
- int ifru_mtu;
- struct ifmap ifru_map;
- char ifru_slave[IFNAMSIZ]; /* Just fits the size */
- char ifru_newname[IFNAMSIZ];
- __caddr_t ifru_data;
- } ifr_ifru;
- };
- # define ifr_name ifr_ifrn.ifrn_name /* interface name */
- # define ifr_hwaddr ifr_ifru.ifru_hwaddr /* MAC address */
- # define ifr_addr ifr_ifru.ifru_addr /* address */
- # define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-p lnk */
- # define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
- # define ifr_netmask ifr_ifru.ifru_netmask /* interface net mask */
- # define ifr_flags ifr_ifru.ifru_flags /* flags */
- # define ifr_metric ifr_ifru.ifru_ivalue /* metric */
- # define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
- # define ifr_map ifr_ifru.ifru_map /* device map */
- # define ifr_slave ifr_ifru.ifru_slave /* slave device */
- # define ifr_data ifr_ifru.ifru_data /* for use by interface */
- # define ifr_ifindex ifr_ifru.ifru_ivalue /* interface index */
- # define ifr_bandwidth ifr_ifru.ifru_ivalue /* link bandwidth */
- # define ifr_qlen ifr_ifru.ifru_ivalue /* queue length */
- # define ifr_newname ifr_ifru.ifru_newname /* New name */
- # define _IOT_ifreq _IOT(_IOTS(char),IFNAMSIZ,_IOTS(char),16,0,0)
- # define _IOT_ifreq_short _IOT(_IOTS(char),IFNAMSIZ,_IOTS(short),1,0,0)
- # define _IOT_ifreq_int _IOT(_IOTS(char),IFNAMSIZ,_IOTS(int),1,0,0)
struct ifconf
通常是用來保存所有接口信息的
[cpp] view plaincopy
- /* Structure used in SIOCGIFCONF request. Used to retrieve interface
- configuration for machine (useful for programs which must know all
- networks accessible). */
- struct ifconf
- {
- int ifc_len; /* Size of buffer. */
- union
- {
- __caddr_t ifcu_buf;
- struct ifreq *ifcu_req;
- } ifc_ifcu;
- };
- # define ifc_buf ifc_ifcu.ifcu_buf /* Buffer address. */
- # define ifc_req ifc_ifcu.ifcu_req /* Array of structures. */
- # define _IOT_ifconf _IOT(_IOTS(struct ifconf),1,0,0,0,0) /* not right */
應用
想要獲取當前網口網線插入狀態,需要用到ifreq結構體,獲取網卡的信息,然后socket結合網卡驅動的ioctl,就可以得到與網線插入狀態相關的數據。
另外推薦一個百度文庫的文章,包含代碼
http://wenku.baidu.com/view/59f4508d680203d8ce2f2412.html
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