Unknown field 'ioctl' specified in initializer

Question

I am tring to compile a demo device module, here is part of my demo.c:
struct file_operations DEMO_fops = {
.owner = THIS_MODULE,
.llseek = DEMO_llseek,
.read = DEMO_read,
.write = DEMO_write,
.ioctl = DEMO_ioctl,
//.unlocked_ioctl = DEMO_ioctl,
//.compat_ioctl = DEMO_ioctl,
.open = DEMO_open,
.release = DEMO_release,
And here is the error message:
error: unknown field ‘ioctl’ specified in initializer
After searching I found this post, so I tried to replace .ioctl with .unlocked_ioctl and .compat_ioctl. Then the compiling succeeded. However, when I try to run the test file:
int main()
int fd;
int i;
char data[256];
int len = sizeof(STRING);
int retval;
fd=open("/dev/devdemo",O_RDWR);
if(fd==-1)
perror("error open\n");
exit(-1);
printf("open /dev/devdemo successfully\n");
retval=ioctl(fd,COMMAND1,0);
if(retval==-1)
perror("ioctl error\n");
exit(-1);
printf("send command1 successfully\n");
retval=write(fd,STRING,len);
if(retval==-1)
perror("write error\n");
exit(-1);
retval=lseek(fd,0,0);
if(retval==-1)
perror("lseek error\n");
exit(-1);
retval=read(fd,data,len);
if(retval==-1)
perror("read error\n");
exit(-1);
printf("read successfully:%s\n",data);
close(fd);
Here is the message using .unlocked_ioctl:
ioctl error
: Bad address
And here the message using .compat_ioctl:
ioctl error
: Inappropriate ioctl for device
At last, I am using Arch Linux with kernel version linux-3.9.4-1-ARCH.
Last edited by Elderry (2013-06-04 13:58:07)

Answer 1

foutrelis wrote:Install Catalyst from either the AUR or the unofficial [catalyst] repo.
His catalyst is from aur and we tried install catalyst from "catalyst repo", but no new packages.
If we install dkms, dkms added fglrx, but cannot build it "Failed to build fglrx-8.801 with DKMS"