Re: Compilation Error: variable has intializer but incomplete type

[Sean Neakums <sneakums@zork.net>]

commence  Marcus Alanen quotation:

>>i am trying to learn and write device driver on linux kernel 2.4 redhat
>>  distribution 
>>
>>iam getting compilation errors for driver code.
>>struct file_operations my_ops ={NULL,my_read,my_write,NULL,NULL,NULL
>>NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
>>NULL };
>>
>>ERROR -> my_ops has intializer but incomplete type
>
> This is not a good way to do it. See e.g. fs/pipe.c#read_fifo_fops
> for an easier approach:
>
> struct file_operations read_fifo_fops = {
>         llseek:         no_llseek,
>         read:           pipe_read,
>         write:          bad_pipe_w,
>         poll:           fifo_poll,
>         ioctl:          pipe_ioctl,
>         open:           pipe_read_open,
>         release:        pipe_read_release,
> };

Aside from this, the main issue is the "has intializer but incomplete
type" error, which indicates that the definition of struct
file_operations has not been seen by the compiler.  This seems to be
defined (in 2.4.20, at least) by include/linux/fs.h, so Raman will
need to #include that file for the initialization to work.

-- 
Sean Neakums - <sneakums@zork.net>