hello,
I am trying to access devices using device files from /dev directory.

after opening file using open() system call I want to give command to that device for which device file is associated.

suppose i want to start web cam of my laptop which content I should write into the device file "/dev/input/event9" is the file associated with webcam.

or suppose i want to access the content of the hard disk from file /dev/sda how i can read this file using read() system call.
if you know any example regarding to this please send it to me.

Thank you....

check this out
tldp.org/LDP/lkmpg/2.6/lkmpg.pdf

http://lwn.net/Kernel/LDD3/

http://ifile.it/yz8ifo/__Advanced_Linux_Programming.pdf

this also
http://ifile.it/xelpbv/__Beginning_L...rogramming.pdf
http://ifile.it/z6x1q9/__The_Linux_P...g_Handbook.pdf
good luck

check this out
http://ifile.it/hsjxrl/__Linux_Progr...by_Example.pdf

What should be written in device file to get work done from that particular device using system call such as read and write????