On Tue, 4 Jan 2005 16:21:07 -0800 (PST), Jaydeep Chokshi <jaydeepzap@xxxxxxxxx> wrote: > 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. Hi, copt_to_user is a function used in kernel to copy data from kernel space to user space. The Source must be a kernel address and Destination Must be User space. snprintf and any other library function does not do inter address space copy. use: copy_to_user(to, from, size); Can you tell in detail what did you want do? Regards -- Manish Regmi -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
