what happens to "open" if the slot is left empty in file_operations.

what happens to "open" if the slot is left empty in file_operations.

[Shiyao Ma]

Hi,


When writing a char device driver, if the "open" slots is left vacant in
the file_operations structure, what will happen if "open" is called ?


An answer that gives the relevant code will be more than appreciated.



Thanks.
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what happens to "open" if the slot is left empty in file_operations.

[Sudip Mukherjee]

On Sat, Nov 14, 2015 at 12:40 PM, Shiyao Ma <i@introo.me> wrote:

> Hi,
>
>
> When writing a char device driver, if the "open" slots is left vacant in
> the file_operations structure, what will happen if "open" is called ?
>

You can have a loot at chrdev_open() function in  fs/char_dev.c  file.

regards
sudip
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