CS111 - Project 1A: I/O and IPC	   Name: Uday Shankar Alla	ID:404428077

The following README file contains information about each of the following
submissions:
1)lab1.c
2)Makefile

==========================================================================
lab1.c
==========================================================================
Program accepts no args or --shell argument from command line and does
the following:
1) When no args are passed:
   a)puts the console into a noncanonical/no echo character at a time mode
   b)reads input from keyboard into buffer
   c)maps <cr> or <lf> to <cr><lf>
   d)write recieved characters back to terminal character at a time.
   e)when ^D is pressed restores original terminal settings and exits
  This part of the program works perfectly without any errors. As spec
  suggested termios, tcgetattr and tcsetattr were used to manipulate
  terminal modes. Input from keyboard was read using read(2) into a
  buffer and similarly outputted to terminal using write(2).
2)when --shell arg is passed:
   a)fork() to create child process where I execvp() to /bin/bash
   b)creates 2 pipes for stdin, stdout
   c)creates 2 threads to simultaneously read and write from
     parent and child process
   d)maps <cr> and <lf> accordingly
   e)follows instructions specified on spec when recieving ^C, ^D, EOF
     and SIGPIPE.
   f)prints shells exit status

Testing: I first executed with no args passed and tested with ^D to see if it
exited correctly. Then I tested with --shell argument. I performed all the
various ^C,^D, exit, and EOF to see if program behaved accordingly. I checked
to see if terminal modes were reset on exiting.

===========================================================================
Makefile
==========================================================================
A simple makefile that has the following targets:
a)default- simply compiles with options -pthread so as to allow threading
b)clean- deletes all (intermediary files)
  buffer files, .o files and executables created.
c)dist- to tar the makefile, readme and lab1.c in a tarball