how to use copy_to_user function...

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I am confused, how to use copy_to_user function. I
register a file thru module in /proc say test_proc.
now 
i used copy_from_user function to copy data writtened
to the file test_proc and stored in static global char
array. now while reading back that file if i use
copy_to_user function then it gives me Fault, so i
used the snprintf() function to copy data in user
buffer.

So anybody let me know how to use copy_to_user()
function. I used gcc 3.x on RHEL 3, Pentium IV m/c.

Regards,
Jaydeep.

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