Comments on: Controlling Input/Output of Device Drivers http://www.linux-mag.com/id/6206/ Open Source, Open Standards Fri, 10 Feb 2012 08:31:47 +0000 hourly 1 http://wordpress.org/?v=3.1 By: djeepp http://www.linux-mag.com/id/6206/#comment-5453 djeepp Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5453 I guess a prerequisite to reading this article would be a basic understanding of coding in c of which I have none of. This stuff is way over my head. I guess a prerequisite to reading this article would be a basic understanding of coding in c of which I have none of. This stuff is way over my head.

]]> By: mohamedhagag http://www.linux-mag.com/id/6206/#comment-5454 mohamedhagag Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5454 nice i hope that we can see more in depth articles like this, Ph. Alan ;) please do it frequently :) . nice i hope that we can see more in depth articles like this, Ph. Alan ;) please do it frequently :) .

]]> By: rakesh uv http://www.linux-mag.com/id/6206/#comment-5455 rakesh uv Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5455 Hi Alan, <br /> That was a wonderful and simple explaination, Keep it UP.<br /> Please Do Post Such Articles frequently.<br /> There one problem with one of the links provided in the article,http://www.linux-mag.com/code/08.03.ioctl.tar.<br /> <br /> Thank You Hi Alan,
That was a wonderful and simple explaination, Keep it UP.
Please Do Post Such Articles frequently.
There one problem with one of the links provided in the article,http://www.linux-mag.com/code/08.03.ioctl.tar.

Thank You

]]> By: aholt http://www.linux-mag.com/id/6206/#comment-5456 aholt Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5456 Thanks for the feedback Rakesh. The article appeared in Linux Magazine a couple of months ago, so they are responsible for publishing the article on-line. To save space the editor took the code listings out and put them on the web. I don't know why the URL doesn't work, but I've let them know - hopefully it will be fixed soon. However, as an alternative, I've put the tar file here: http://agholt.googlepages.com/ioctl.tar.gz Thanks for the feedback Rakesh. The article appeared in Linux Magazine a couple of months ago, so they are responsible for publishing the article on-line. To save space the editor took the code listings out and put them on the web. I don’t know why the URL doesn’t work, but I’ve let them know – hopefully it will be fixed soon. However, as an alternative, I’ve put the tar file here: http://agholt.googlepages.com/ioctl.tar.gz

]]> By: cirnath http://www.linux-mag.com/id/6206/#comment-5457 cirnath Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5457 Just to be clear... the show_ints code can only see interfaces which are in an 'up' state.<br /> <br /> If you were truly doing interface discovery (i.e. for an installer or some such) and no interfaces are in a configured state, what would the code look like to identify the interfaces? Just to be clear… the show_ints code can only see interfaces which are in an ‘up’ state.

If you were truly doing interface discovery (i.e. for an installer or some such) and no interfaces are in a configured state, what would the code look like to identify the interfaces?

]]> By: aholt http://www.linux-mag.com/id/6206/#comment-5458 aholt Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5458 Yes you are correct, I probably should have made that clear in the article. I'm just really trying to demonstrate ioctls calls rather write a fully fledged "interface discovery" utility. If I were, I'd probably just get them out of /proc/net/dev. But thanks for the clarification. Yes you are correct, I probably should have made that clear in the article. I’m just really trying to demonstrate ioctls calls rather write a fully fledged “interface discovery” utility. If I were, I’d probably just get them out of /proc/net/dev. But thanks for the clarification.

]]> By: cirnath http://www.linux-mag.com/id/6206/#comment-5459 cirnath Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5459 Ok. I didn't know whether ioctl could be used in some other way to obtain the 'down' interfaces as well. That was more my reason for asking. I wasn't (intentionally) trying to be annoyingly pedantic. Ok. I didn’t know whether ioctl could be used in some other way to obtain the ‘down’ interfaces as well. That was more my reason for asking. I wasn’t (intentionally) trying to be annoyingly pedantic.

]]> By: aholt http://www.linux-mag.com/id/6206/#comment-5460 aholt Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/6206/#comment-5460 Cirnath: I didn't think you were trying to be pedantic - it's a good point. Browsing through the header files SIOCGIFCONF is the only function I see that returns a list of interfaces and, as you correctly point out, it doesn't return down interfaces - if it doesn't have an IP address. A down interface with an IP address does show up (how weird is that?) I guess the behaviour of SIOCGIFCONF is down to the whim of the kernel developers. Cirnath: I didn’t think you were trying to be pedantic – it’s a good point. Browsing through the header files SIOCGIFCONF is the only function I see that returns a list of interfaces and, as you correctly point out, it doesn’t return down interfaces – if it doesn’t have an IP address. A down interface with an IP address does show up (how weird is that?) I guess the behaviour of SIOCGIFCONF is down to the whim of the kernel developers.

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