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Old 07-11-2004, 04:22 PM   #1
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how to use c functions in linux kernel mode


I used some c functions in my program such as pow, log, puts. When I try to make the program work as a module, it gives some errors.

% /usr/local/sbin/click-install
/usr/local/lib/click.o: unresolved symbol pow
/usr/local/lib/click.o: unresolved symbol log
/usr/local/lib/click.o: unresolved symbol puts
/usr/local/lib/click.o: unresolved symbol printf
click-install: /sbin/insmod /usr/local/lib/click.o failed

Can I use the c functions in the kernel program? If can, how to use it? Thanks

Old 07-11-2004, 09:47 PM   #2
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No - you generally cannot use standard C library functions in kernel code.

I'm not sure if the math functions "pow" or "log" can be made to work safely; the stdlib functions "puts" and "printf" absolutely cannot be used in kernel code.
Old 07-11-2004, 11:23 PM   #3
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I think that "pow" and "log" can't be used in kernel. So I have to write it by myself. But do you know how to implement them? or do you know where I can get the source code?



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