The programs in this directory are those developed in Chapter 4 of the book.
The spl_cp* programs are very simple implementations of the cp command,
whose main purpose is to introduce the kernel interface for file I/O.
The last two are programs designed to test the overhead of library function
calls and system calls respectively.

Their order in the book is as follows.
spl_cp1.c
spl_cp2.c
spl_libcalloverhead.c
spl_syscalloverhead.c
