Is there a UNIX C system command that will let me copy a file?
I am looking for something similar to "cp" that can be called within a
C program.
I know of the "link" system call but this command will set a the
second file as a link to the first file rather than an independent
copy of the first file.
(Windows has the CopyFile command but I didn't find anything that
would work under UNIX)

I am also looking for C commands to move files. Is the C system call
"rename" equivalent to Window's specific MoveFileEx function?