ioctl查询无线网卡信息
#include<unistd.h>
#include<sys/ioctl.h>
int ioctl( int fd, int request,.../* void *arg */ );
//返回0：成功 -1：出错 //第三个参数总是一个指针，但指针的类型依赖于request参数。
request 参数定义如下：/* -------------------------- IOCTL LIST-------------------------- */
/* Basic operations */
#define SIOCSIWCOMMIT 0x8B00 /* 提交修改结果 */
#define SIOCGIWNAME 0x8B01 /* 获取设备名字 */
#define SIOCSIWNWID 0x8B02 /* 设置网络ID */
#define SIOCGIWNWID 0x8B03 /* 获取网络ID */ #define SIOCSIWFREQ 0x8B04 /* 设置信道（频率） */ #define SIOCGIWFREQ 0x8B05 /* 获取信道（频率） */ #define SIOCSIWMODE 0x8B06 /* 设置网卡模式*/ #define SIOCGIWMODE 0x8B07 /* 获取网卡模式 */ #define SIOCSIWSENS 0x8B08 /* 设置灵敏度(dBm) */ #define SIOCGIWSENS 0x8B09 /* 获取灵敏度 (dBm) */ /* Informative stuff */ #define SIOCSIWRANGE 0x8B0A /* Unused */ #define SIOCGIWRANGE 0x8B0B /* 获取参数范围 */ #define SIOCSIWPRIV 0x8B0C /* Unused */ #define SIOCGIWPRIV 0x8B0D /* 获取网卡特有的ioctl接口 */ #define SIOCSIWSTATS 0x8B0E /* Unused */ #define SIOCGIWSTATS 0x8B0F /* 获取 /proc/net/wireless的stats */ /* Mobile IP support */ #define SIOCSIWSPY 0x8B10 /* 设置spy 地址*/ #define SIOCGIWSPY 0x8B11 /* 获取spy信息（连接质量） */ /* Access Point manipulation */ #define SIOCSIWAP 0x8B14 /* 设置AP的mac地址 */ #define SIOCGIWAP 0x8B15 /* 获取AP的mac地址 */ #define SIOCGIWAPLIST 0x8B17 /* 获取周围Ap信息列表 */ #define SIOCSIWSCAN 0x8B18 /* 开始扫描 */ #define SIOCGIWSCAN 0x8B19 /* 获取扫描信息 */ /* 802.11 specific support */ #define SIOCSIWESSID 0x8B1A /* 设置ESSID */ #define SIOCGIWESSID 0x8B1B /* 获取ESSID */ #define SIOCSIWNICKN 0x8B1C /* 设置节点别名 */ #define SIOCGIWNICKN 0x8B1D /* 获取节点别名 */ /* As the ESSID and NICKN are strings upto 32 bytes long, it doesn't fit * within the 'iwreq' structure, sowe need to use the 'data' member to * point to a string in user space,like it is done for RANGE... * The "flags" memberindicate if the ESSID is active or not (promiscuous). */ /* Other parameters useful in 802.11 andsome other devices */ #define SIOCSIWRATE 0x8B20 /* 设置默认传输速率(bps) */ #define SIOCGIWRATE 0x8B21 /* 获取默认传输速率 (bps) */ #define SIOCSIWRTS 0x8B22 /* 设置 RTS/CTS 的临界值(bytes) */ #define SIOCGIWRTS 0x8B23 /* 获取 RTS/CTS 的临界值 (bytes) */ #define SIOCSIWFRAG 0x8B24 /* 设置分片传输的包大小 (bytes) */ #define SIOCGIWFRAG 0x8B25 /* 获取分片传输的包大小 (bytes)*/ #define SIOCSIWTXPOW 0x8B26 /* 设置传输功率 (dBm) */ #define SIOCGIWTXPOW 0x8B27 /* 获取传输功率(dBm) */ #define SIOCSIWRETRY 0x8B28 /* 设置重传次数和生存时间 */ #define SIOCGIWRETRY 0x8B29 /* 获取重传次数和生存时间 */ /* Encoding stuff (scrambling, hardwaresecurity, WEP...) */ #define SIOCSIWENCODE 0x8B2A /* 设置编码模式 */ #define SIOCGIWENCODE 0x8B2B /* 获取编码模式 */ /* Power saving stuff (power management,unicast and multicast) */ #define SIOCSIWPOWER 0x8B2C /* 设置电源管理模式 */ #define SIOCGIWPOWER 0x8B2D /* 获取电源管理模式*/ /* -------------------- DEV PRIVATE IOCTLLIST -------------------- */ /* These 16 ioctl are wireless deviceprivate. * Each driver is free to use themfor whatever purpose it chooses, * however the driver *must* exportthe description of those ioctls * with SIOCGIWPRIV and *must* usearguments as defined below. * If you don't follow those rules,DaveM is going to hate you (reason : * it make mixed 32/64bit operationimpossible). */ #define SIOCIWFIRSTPRIV 0x8BE0 #define SIOCIWLASTPRIV 0x8BFF /* Previously, we were usingSIOCDEVPRIVATE, but we now have our * separate range because ofcollisions with other tools such as * 'mii-tool'. * We now have 32 commands, so a bitmore space ;-). * Also, all 'odd' commands are onlyusable by root and don't return the * content of ifr/iwr to user (butyou are not obliged to use the set/get * convention, just use every othertwo command). * And I repeat : you are not obligedto use them with iwspy, but you * must be compliant with it. */ /* ------------------------- IOCTL STUFF------------------------- */ /* The first and the last (range) */ #define SIOCIWFIRST 0x8B00 #define SIOCIWLAST SIOCIWLASTPRIV /* 0x8BFF */