Question regarding hotplug/udev + USB key

Question regarding hotplug/udev + USB key

[Greg]

On May 11, 2007, at 3:34 AM, Greg KH wrote:

> Great questions, care to ask this on the linux-hotplug-devel mailing
> list and CC me?  That way I can answer it in public to enable everyone
> else to know the answer, and let the search engines pick it up.

Sure thing! Here's my question again:

I'm currently working on a project (a program written in C++) and I  
need to be notified whenever a USB key is attached to the computer  
and what the absolute path of that key is so that I can automatically  
see what's inside of it.

What is the easiest and proper (modern) way of doing this?  Should I  
create a script in /etc/hotplug.d/usb or should I add a rule to the / 
etc/udev/rules.d folder?  Please be aware that I'm really kind of  
shooting in the dark here and don't really have a strong grasp on any  
of this so if you happen to know of a good link that might point me  
in the right direction to solving my problem I would appreciate that  
greatly as well (currently I'm going off of what are likely outdated  
online documents).

The computer that this program will run on has a linux 2.6 kernel.

Kind regards,

- Greg Slepak



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Re: Question regarding hotplug/udev + USB key

[Andrey Borzenkov]

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On Friday 11 May 2007, Greg wrote:
> On May 11, 2007, at 3:34 AM, Greg KH wrote:
> > Great questions, care to ask this on the linux-hotplug-devel mailing
> > list and CC me?  That way I can answer it in public to enable everyone
> > else to know the answer, and let the search engines pick it up.
>
> Sure thing! Here's my question again:
>
> I'm currently working on a project (a program written in C++) and I
> need to be notified whenever a USB key is attached to the computer
> and what the absolute path of that key is so that I can automatically
> see what's inside of it.
>
> What is the easiest and proper (modern) way of doing this?  Should I
> create a script in /etc/hotplug.d/usb or should I add a rule to the /
> etc/udev/rules.d folder? 

yet another possibility is to use HAL notifications over D-Bus (listen for 
DeviceAdded and then check for speific porperties). This way you may even 
expect more portability as udev is Linux specific and HAL is available on 
Solaris and BSD (although I do not know how complete implementation is). HAL 
specification is on 
http://people.freedesktop.org/~david/hal-spec/hal-spec.html; freedesktop.org 
also hosts D-Bus; specifically 
http://www.freedesktop.org/wiki/Software/dbus-cpp seems to provide C++ 
binding to D-Bus (but you of course can use C bindings which are more 
mature).

HTH

-andrey

> Please be aware that I'm really kind of 
> shooting in the dark here and don't really have a strong grasp on any
> of this so if you happen to know of a good link that might point me
> in the right direction to solving my problem I would appreciate that
> greatly as well (currently I'm going off of what are likely outdated
> online documents).
>
> The computer that this program will run on has a linux 2.6 kernel.
>
> Kind regards,
>
> - Greg Slepak
>
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
> Linux-hotplug-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel



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Re: Question regarding hotplug/udev + USB key

[Greg]

Thanks Andrey, I'll have a look at this.

So there are three different ways of accomplishing this task? What  
are the pros and cons of each method? (Such as ease of use,  
stability, support, speed, etc).  And what would be the best one for  
me to use for what I'm trying to do, or are they all equivalent?

Thanks!

- Greg

On May 11, 2007, at 11:33 PM, Andrey Borzenkov wrote:

> On Friday 11 May 2007, Greg wrote:
>> On May 11, 2007, at 3:34 AM, Greg KH wrote:
>>> Great questions, care to ask this on the linux-hotplug-devel mailing
>>> list and CC me?  That way I can answer it in public to enable  
>>> everyone
>>> else to know the answer, and let the search engines pick it up.
>>
>> Sure thing! Here's my question again:
>>
>> I'm currently working on a project (a program written in C++) and I
>> need to be notified whenever a USB key is attached to the computer
>> and what the absolute path of that key is so that I can automatically
>> see what's inside of it.
>>
>> What is the easiest and proper (modern) way of doing this?  Should I
>> create a script in /etc/hotplug.d/usb or should I add a rule to the /
>> etc/udev/rules.d folder?
>
> yet another possibility is to use HAL notifications over D-Bus  
> (listen for
> DeviceAdded and then check for speific porperties). This way you  
> may even
> expect more portability as udev is Linux specific and HAL is  
> available on
> Solaris and BSD (although I do not know how complete implementation  
> is). HAL
> specification is on
> http://people.freedesktop.org/~david/hal-spec/hal-spec.html;  
> freedesktop.org
> also hosts D-Bus; specifically
> http://www.freedesktop.org/wiki/Software/dbus-cpp seems to provide C++
> binding to D-Bus (but you of course can use C bindings which are more
> mature).
>
> HTH
>
> -andrey
>
>> Please be aware that I'm really kind of
>> shooting in the dark here and don't really have a strong grasp on any
>> of this so if you happen to know of a good link that might point me
>> in the right direction to solving my problem I would appreciate that
>> greatly as well (currently I'm going off of what are likely outdated
>> online documents).
>>
>> The computer that this program will run on has a linux 2.6 kernel.
>>
>> Kind regards,
>>
>> - Greg Slepak
>>
>>
>>
>> --------------------------------------------------------------------- 
>> ----
>> This SF.net email is sponsored by DB2 Express
>> Download DB2 Express C - the FREE version of DB2 express and take
>> control of your XML. No limits. Just data. Click to get it now.
>> http://sourceforge.net/powerbar/db2/
>> _______________________________________________
>> Linux-hotplug-devel mailing list  http://linux- 
>> hotplug.sourceforge.net
>> Linux-hotplug-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
>
>


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http://sourceforge.net/powerbar/db2/
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
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