how does the mount system call works? [closed] - filesystems

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I am a newbie to linux, I want to understand the internal working of mount command. Can any one guide me to any good document or a book that explains the working. I would be very glad if anyone can even tell me any good book to understand the working of filesystem. Thanks in advance.

I have a suspicion that some aspects of it are out of date, but this document introduces the internals of some key parts of the VFS system which it sounds like you're interested in. There's also documentation about VFS registration and mounting in the kernel tree too.

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I want to create my own plugin for Azkaban [closed]

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I'm trying to do what I wrote at this mail's subject.
But the number of the information on the internet seems very few.
Does anyone know about that or helpful webpages?
I agree. I am trying to find similar information. I have just found this until now. Maybe indirectly helpful to you.
http://submitteddenied.github.io/azkaban2/documents/2.1/createnewjobtypes.html
It talks about creating new job types. Not sure what kind of plugin you are creating but I was creating a new job type plugin and I came across this.
I also found their google group pretty helpful. You may want to post there too https://groups.google.com/forum/?fromgroups#!forum/azkaban-dev
I know this is not the exact answer you were looking for but hopefully it helps.

Linux C API for CPU Usage [closed]

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I understand on Linux systems there is getrusage() API for finding the CPU usage for the current process. Is there an API like that for getting the system CPU usage in terms of percent? Or should I simply go for the solution discussed at https://unix.stackexchange.com/a/21564 where I manually read /proc/stat? What do software like htop and top use to find user, sys, idle, etc?
Thanks in advance.
top interrogates /proc/stat, to the best of my knowledge there's no API for what you're asking.

mobile phones make/model/characteristic database [closed]

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Please help finding software/database with mobile phones make/model/characteristic database. I need it to integrate into my website.
Most of these are copyrighted so we can't help you. Best idea is to pull the data manually from the makes you know....
There might be free sources out there, but I highly doubt it.
edit
to update my post... Wikipedia is a great source of information, but please observe the licenses which they have over their data. Most often, it's the Creative Commons License, but this doesn't meant that their sources have other licenses... And there are others too...
Manufacturers/Makes:
http://en.wikipedia.org/wiki/List_of_mobile_phone_makers_by_country
http://www.phonearena.com/
Models:
http://www.phonearena.com/

Assimp library usage documents [closed]

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I found a library called Assimp for parsing a lot of 3D model file formats that I could use to import to OpenGL. It seem a good and stable libray but the usage documents are so poor. Can someone tell me how I use this library to import a obj (or another) model? Or just give me a tutorial for that.
I found their documentation to actually be quite good, albeit hard to navigate. Check out the usage page for how to get started.

Can I use the Music Genome Project? [closed]

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Is there an API or database I can access or is it a proprietary project?
The Music Genome Project is owned by Pandora Media, Inc. Unless you get into contact with them directly (and even if you ask nicely), I don't think you'll gain any access to it.
There is no Pandora API that currently exists, but I found something that might be helpful:
http://code.google.com/p/openpandora/
If you look into this, it should provide a little bit of insight into how to connect to pandora and use some of its services.
TlDr: No, not directly anyways.

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