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CST8165 Lab Attendance Exercise #82 - Week 2
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-Ian! D. Allen - idallen@idallen.ca - www.idallen.com

This is a very small program to complete and submit as your record of
attendance in the lab this week.

Using the Unix system calls read() and write(), create a main program
and one function.  The function receives two open Unix file descriptors
as arguments.  The function loops reading from the first descriptor and
writing to the second descriptor with full error and EOF checking.

(You don't have to worry about the write() failing to write all the
data, since this toy program is not writing to sockets, it's writing
to the file system.)

Errors must cause the program to exit with a non-zero status, and the
error messages must be output in the four-part format given in the Class
Notes file programming_style.txt.  The GNU error() function is a good
way to output error messages (though it isn't portable to non-Linux
platforms).

Remember: EOF is not an error.

The main program must call the function, passing it the descriptors for
standard input and standard output.  (No open() calls are needed - stdin
and stdout are already open!)  No command line arguments are needed.

The submission command "cstsubmit" is documented in the class notes.
Submit your completed and tested source file using this (exact) command
line (spelling counts):

    $ ~alleni/bin/cstsubmit 82 mycopy.c