iwpriv配置失败的问题追踪[ioctl调用过程解析]

现象：执行 iwpriv athXXX XXXX , ioctl报错

bugfix：

【 app 】 [ iwpriv.c] print_priv_info —> [iwlib.c] iw_get_priv_info —>

iw_get_ext(skfd, ifname, SIOCGIWPRIV, &wrq)

—> ioctl(skfd, request, pwrq)

【kernel】上述ioctl实际上通过系统调用进入kernel space,

fs/Ioctl.c

SYSCALL_DEFINE3(ioctl, unsigned int, fd,unsigned int, cmd, unsigned long, arg)

{

……………………………………………………………………..

error= do_vfs_ioctl(filp, fd, cmd, arg);//调用虚拟文件系统的ioctl

……………………………………………………………..

}

do_vfs_io