Compilation Error: variable has intializer but incomplete type

Compilation Error: variable has intializer but incomplete type

[ramands]

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

Can anyone help me  with this 
Regards
Raman


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Re: Compilation Error: variable has intializer but incomplete type

[Marcus Alanen]

>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,
};


-- 
Marcus Alanen
maalanen@abo.fi

Re: Compilation Error: variable has intializer but incomplete type

[Sean Neakums]

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>

Re: Compilation Error: variable has intializer but incomplete type

[Jörn Engel]

On Tue, 1 April 2003 12:07:22 +0300, Marcus Alanen wrote:
> 
> >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,
> };

You should use the c99 initializers, though.

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,
};

Jörn

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