Re: [Minios-devel] [Unikraft] Static Libraries not being linked properly

[Wei Chen <Wei.Chen@xxxxxxx>]

Hi Ajay,

> -----Original Message-----
> From: Ajay Garg <ajaygargnsit@xxxxxxxxx>
> Sent: 2018年5月4日 11:55
> To: Wei Chen <Wei.Chen@xxxxxxx>
> Cc: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>; minios-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Minios-devel] [Unikraft] Static Libraries not being linked
> properly
>
> Hi Wei.
>
> Thanks for the reply.
>
> On Fri, May 4, 2018 at 8:21 AM, Wei Chen <Wei.Chen@xxxxxxx> wrote:
> > Hi Ajay,
> >
> > As what I understand, most of the libraries will use the posix
> > APIs that provided by libc to use system functions. For Linux,
> > the libc is a wrap of Linux system calls. For Unikraft, the Libc
> > is a wrap of platform APIs.
>
> Hmm, currently in lib/nolibc, I only see files such as string.c,
> stdlib.c etc, all of which look bare-metal code to me.
> I am sure I am overlooking something, but I will be grateful if you
> could give one example of an API wrapping platform APIs.
>

You can see the code in lib/nolibc/stdio.c:
int vfprintf(FILE *fp, const char *fmt, va_list ap)

This API is a wrap of ukplat_coutk. ukplat_coutk is a platform API
which is provided by platform console library (plat/xen/console.c or
plat/kvm/x86/console.c)

> > Linux has more than 300 system calls,
> > as Unikraft is new, we don’t have so many platform APIs in this
> > stage. This means we haven't implemented all posix APIs in nolibc,
> > if the libraries of filesystem/lwip/other are using some APIs that
> > we are missing, you have to implement them in current stage.
>
> Hmm.. just curious, src-netbsd in rumprun manages to provide all APIs
> for xen (too bad there is no support for xen-on-arm there).


I regret that too : (
But I am not familiar with src-netbsd, I am not very clear about
"provide all APIs" here.

> So, is this trait (wrapping of APIs in libc in unikraft) an
> architectural difference from rumprun?
>

Ahh, I think we have made some mis-understanding. nolibc is just an example,
I think we can implement the network APIs in a library name libnet or etc : )

Those above are all my personal understanding, I think Simon can give you
an official answer ;)


>
> >
> > Regards,
> > Wei Chen
> >
>
> Thanks again for all the information and help.
>

You're welcome, I also benefit much from our open discussion : )

>
> Thanks and Regards,
> Ajay
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