使用Ioctl向Linux内核传递参数的方法

uint16 data16;

if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)

{

printf("socket failed\n\r");

} 

if(ioctl(fd, SIOCSIFVLAN_PVID_PRI, &data16) < 0)

{

printf("ioctl pvid failed\n\r");

}

#define SIOCSIFVLAN_PVID_PRI 0x8985 /* Set 802.1Q VLAN pvid */

\extern int VLAN1QEN(unsigned int ,void *arg);

case SIOCSIFVLAN_PVID_PRI: 

return VLAN1QEN(cmd, arg);

static unsigned int VLAN_PVID_PRI = 0;

int VLAN1QEN(unsigned int cmd,void *arg)

{

unsigned int data;

if (copy_from_user(&data, arg, sizeof(int)))

return -EFAULT;

switch (cmd) {

case SIOCSIFVLAN_PVID_PRI:

VLAN_PVID_PRI = data;

break;

default:

return -EINVAL;

}

}