Loadable kernel module trouble with sleep() function call in RedHat

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http://stackoverflow.com – I am facing an issue in trying to load an LKM into the RedHat kernel using insmod, but it returns me the following error:- Insmod –f tmdq.o tmdq.o: unresolved symbol sleep Why should sleep() system call from within the LKM cause an issue? I wish to check if there is some other name given to sleep() in the Red Hat Linux 3.2.2-5, Linux version 2.4.20-8. Also, is there a way to browse the source code of RedHat online, without having to download it? Thanks. (HowTos)