discussion related to implementation of File descriptor functions in RTEMS

[Eshan Dhawan]

On Thu, Mar 26, 2020 at 11:18 AM Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 25/03/2020 20:33, Joel Sherrill wrote:
>
>
>
> On Wed, Mar 25, 2020 at 12:17 AM Eshan Dhawan <eshandhawan51 at gmail.com>
> wrote:
>
>>
>>
>> On Wed, Mar 25, 2020 at 4:01 AM Joel Sherrill <joel at rtems.org> wrote:
>>
>>>
>>>
>>> On Tue, Mar 24, 2020 at 4:57 PM Eshan Dhawan <eshandhawan51 at gmail.com>
>>> wrote:
>>>
>>>> Hello everyone,
>>>> As @Vaibhav Gupta <vaibhav.varodek at gmail.com> suggested I have also
>>>> added adding file descriptor functions to my GSOC project.
>>>> I went through the mailing list archives for more information.
>>>> RTEMS as its own file descriptor so the functions need to be
>>>> implemented from scratch.
>>>> I wanted to get more information related to it.
>>>>
>>>
>>> What's the set of functions you are proposing for those not tracking
>>> your draft proposal?
>>>
>> Link:
>> https://docs.google.com/document/d/1n-JOFUbFn6V1kViAGWsEGbVHL9MxlMyKP0BbZhEA1Rs/edit?usp=sharing
>> I haven't searched about the functions in the list yet. The list was made
>> by Vaibhav, last year and he told me that it could be added to proposal
>> this year as well.
>> I read the archives that these need to be written from scratch.
>>
>
>
> Maybe not. I found at least this implementation of renameat() which was
> implemented on top of existing calls:
>
>
> https://github.com/lattera/freebsd/blob/master/contrib/openbsm/bin/auditdistd/renameat.h
>
> It should be in a C file but that shows it can be done. That directory has
> a lot of these methods.
>
> Adding the *at() functions with an RTEMS-specific implementation would be
> nice (and not difficult). The generic renameat() implementation for example
> changes the current directory. One of the goals of this API is to avoid
> exactly this. In glibc/Linux for example a system call is used:
>
>
> https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/renameat.c;h=901d61f37e10d0c2df245c01bb2ef980d00e8f52;hb=HEAD
>
> https://github.com/torvalds/linux/blob/master/fs/namei.c#L4590
>
Can you tell where to find details related to these function as well as how
to implement them?
:)

thanks
-Eshan
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