Custom ioctl on Linux FORE200E ATM driver

[dalves]

I need to pass a user-space pointer for a 64 bit memory chunk to the FORE200E Linux ATM driver so that the driver can write in it. I was thinking of using the ioctl() call to perform this custom "operation" of recording the user-space pointer in the driver module.

I open the socket without a problem:

atmSocket = socket(PF_ATMPVC, SOCK_DGRAM, 0);

I can do setsockopt(atmSocket, ...), send(atmSocket, ...) and recv(atmSocket, ...) calls also without a problem.

However, regardless of the cmd I pass to the ioctl() call, it always fails with the "No such device" error message:

int someInt;
ioctl(atmSocket, FIOGETOWN, &someInt);
perror("ioctl");

-> ioctl: No such device

 

[Future Bruno]

Is it possible to pass a user-space pointer to the FORE200E Linux ATM driver using ioctl? If yes, what is the proper way of doing this? No, it is not possible to use ioctl() to pass a user-space pointer to the FORE200E Linux ATM driver. The FORE200E Linux ATM driver does not support the ioctl() call, so it is not possible to use the ioctl() call to send the user-space pointer.The best way to pass a user-space pointer to the FORE200E Linux ATM driver would be to use the mmap() system call. The mmap() system call is used to map a file descriptor (or any other object) into memory and then access that memory directly from the user-space. This is the recommended approach for passing user-space pointers to the FORE200E Linux ATM driver.