Create an application for copying files with a help of sendfile() linux function. Function main() and function for copying MUST be placed in a different files. File with function for copying (which use sendfile() internally) must be built to static library. During the build process file with main() must be linked with a created static library. Copied file must be a FULL copy of the original one (except full path/name of course). To enter original file name and name of the copy could be used program arguments or input during the execution. For build process must be used makefile.
Create an application which opens unnamed pipe and creates new process using fork(). After that child process writes to pipe message "Hi daddy, I'm your child!" and finishes its execution. Parent process must read this message from a pipe, append string "Hi!" to the end. After that parent process must save final text with two messages to file on a disk. Makefile must be used as a build system.