Re: Listing a directory using the file system session

[Martijn Verschoor]

Dear Genode community,

Christian, Emery, NobodyIII, thanks for your suggestions.

I see the benefit for using the VFS library, but for the component I’m working 
on right now, using a file system session directly is more appropriate. 
Therefore I implemented the functionality of listing the directory entries 
similar to the dirent() implementation for VFS as hinted by Christian. This 
works like a charm.

Met vriendelijke groet / kind regards,

Martijn Verschoor

Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands
+31 35 631 3253 (office) |  +31 616 014 087 (mobile)



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Re: Listing a directory using the file system session

[Nobody III]

I have written a file manager for Genode, so that could be useful if you
don't want to use the VFS system. It's part of my work on a desktop
environment, and it's not entirely complete, but it should be fairly usable
still. If you want to use that as a starting point, here's a link:
https://github.com/NobodyIII/genode-desktop-environment

Here's the specific file with the _dir() function:
https://github.com/NobodyIII/genode-desktop-environment/blob/master/src/app/file_manager/genodefs.cpp

On Thu, Dec 15, 2016 at 7:32 AM, Emery Hemingway  wrote:

> Hello Martijn,
>
> The File_system client in the VFS library is the only example that I can
> think of
> for reading directory entries. I would recommend using the VFS library
> rather than
> using a File_system session directly, the library is easier to use and
> this would
> give you a lot more power for free, such as merging the same directory
> present in
> multiple File_system sessions.
>
> https://github.com/genodelabs/genode/blob/master/repos/os/
> src/lib/vfs/fs_file_system.h#L279
>
> Cheers,
> Emery Hemingway
>
> On Thu, Dec 15, 2016 at 01:42:45PM +0100, Martijn Verschoor wrote:
> > Dear Genode community,
> >
> > I’m looking for a way to list the files (nodes) in a directory using a
> file system session. Amongst other, I studied the File_system::Session and
> file_system/utils.h but cannot find a hook to get started. I see that
> reading the directory nodes is supported -> this returns the
> Directory_entry struct with information about the directory itself, but not
> about the nodes the directory contains (right?). Is there a way retrieve
> the latter?
> >
> > Any help is appreciated!
> >
> > Met vriendelijke groet / kind regards,
> >
> > Martijn Verschoor
> >
> > Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The
> Netherlands
> > +31 35 631 3253 (office) |  +31 616 014 087 (mobile)
> >
> >
> >
> >
> >
> >
> >
> > 
> --
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> >
>
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Re: Listing a directory using the file system session

[Emery Hemingway]

Hello Martijn,

The File_system client in the VFS library is the only example that I can think 
of
for reading directory entries. I would recommend using the VFS library rather 
than
using a File_system session directly, the library is easier to use and this 
would
give you a lot more power for free, such as merging the same directory present 
in
multiple File_system sessions.

https://github.com/genodelabs/genode/blob/master/repos/os/src/lib/vfs/fs_file_system.h#L279

Cheers,
Emery Hemingway

On Thu, Dec 15, 2016 at 01:42:45PM +0100, Martijn Verschoor wrote:
> Dear Genode community,
> 
> I’m looking for a way to list the files (nodes) in a directory using a file 
> system session. Amongst other, I studied the File_system::Session and 
> file_system/utils.h but cannot find a hook to get started. I see that reading 
> the directory nodes is supported -> this returns the Directory_entry struct 
> with information about the directory itself, but not about the nodes the 
> directory contains (right?). Is there a way retrieve the latter?
> 
> Any help is appreciated!
> 
> Met vriendelijke groet / kind regards,
> 
> Martijn Verschoor
> 
> Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands
> +31 35 631 3253 (office) |  +31 616 014 087 (mobile)
> 
> 
> 
> 
> 
> 
> 
> --
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> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
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> https://lists.sourceforge.net/lists/listinfo/genode-main
> 


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Re: Listing a directory using the file system session

[Christian Helmuth]

Hello Martijn,

On Thu, Dec 15, 2016 at 01:42:45PM +0100, Martijn Verschoor wrote:
> I’m looking for a way to list the files (nodes) in a directory using
> a file system session. Amongst other, I studied the
> File_system::Session and file_system/utils.h but cannot find a hook
> to get started. I see that reading the directory nodes is supported
> -> this returns the Directory_entry struct with information about
> the directory itself, but not about the nodes the directory contains
> (right?). Is there a way retrieve the latter?

You are on the right track, that reading directory entries (like in
dirent()) is provided as read operation on directory nodes. Please
have a look at os/src/lib/vfs/fs_file_system.h for an implementation
of dirent(). The trick is to use n * sizeof(::File_system::Directory_entry)
as file_offset parameter to read the n-th entry.

Hope this helps
-- 
Christian Helmuth
Genode Labs

https://www.genode-labs.com/ · https://genode.org/
https://twitter.com/GenodeLabs · /ˈdʒiː.nəʊd/

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Listing a directory using the file system session

[Martijn Verschoor]

Dear Genode community,

I’m looking for a way to list the files (nodes) in a directory using a file 
system session. Amongst other, I studied the File_system::Session and 
file_system/utils.h but cannot find a hook to get started. I see that reading 
the directory nodes is supported -> this returns the Directory_entry struct 
with information about the directory itself, but not about the nodes the 
directory contains (right?). Is there a way retrieve the latter?

Any help is appreciated!

Met vriendelijke groet / kind regards,

Martijn Verschoor

Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands
+31 35 631 3253 (office) |  +31 616 014 087 (mobile)







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