ioctl() 使用举例

整理一些例子，备忘！

ioctl()

---

used for control device

#include <sys/ioctl.h>
int ioctl(int d, int request, ...);

所有的request参数及解释 http://goo.gl/gHOh71

第三个参数根据request的类型有5种不同的类型：

• int
• struct ifconf http://linux.die.net/man/7/netdevice
• struct ifreq http://linux.die.net/man/7/netdevice
• struct arpreq http://goo.gl/ZlCFbD
• struct rtentry http://goo.gl/ADwW41

使用举例

• 获取网卡IP地址 http://goo.gl/kfHS78

• 更多操作interfaces的例子 http://goo.gl/f18XkC

• 查询ARP缓存表 http://goo.gl/QOnFfb

需要在ioctl函数调用前增加 strcpy(req.arp_dev, “eth0”);

• 增加、删除路由项 http://goo.gl/2TAcfx

KVM API

The kvm API is a set of ioctls that are issued to control various aspects of a virtual machine. –http://goo.gl/lw4bPm

QEMU userspace process uses kvm.ko driver to execute guest code:

    open("/dev/kvm")
    ioctl(KVM_CREATE_VM) 
    ioctl(KVM_CREATE_VCPU)
    for (;;) {
        ioctl(KVM_RUN)
            switch (exit_reason) {
            case KVM_EXIT_IO:  /* ... */
            case KVM_EXIT_HLT: /* ... */
            }
    }

link: http://goo.gl/qgDTV6