Code Authors: Michael Baptist 
Lab Section : Monday 12 - 2 

Compile: .c -> .o -> binexec

1.	generate .o file : gcc -g -O0 -Wall -Wextra -std=gnu99 -c [.c file]
2.	generate bin exec: gcc -g -O0 -Wall -Wextra -std=gnu99 -o [exec] [.o file]

Alternativly use my Makefile.
1. make all 
      -- compiles the source.

2. make clean
      -- remove all .o files

3. make wipe
      -- remove all .o and binexec

Runtime: Run on all two separate machines, or lab computers. 

1. Client Program.
NAME
     client -- contacts a server to obtain a chunk of a file from the server 
               using pthreadds. Collects all chunks then it puts them together 
               to form a whole file.

SYNOPSIS
     client <filename> <number of connections>

DESCRIPTION
     This program contacts a server to obtain a chunk of a file from the server 
     using pthreadds. Collects all chunks then it puts them together 
     to form a whole file.

OPERANDS
     The two operands are first an filename to be retreived, and second a 
     number of threads that it wants to use to collect the file using. Really 
     then number of server connections it wants to make. 

EXIT STATUS

     0    No errors were detected.
     1    One or more errors were detected and error messages were
          printed.
 errno    If a man page call detects an error, perror prints a sys
          message and exits with return value of errno.
.c and utils.h
  -- basic library for printing debug statements
  -- error handling for read and write system calls.

2. Server PRogram
NAME
     server -- returns a formatted time to a requesting client

SYNOPSIS
     server [Port]

DESCRIPTION  
     This program accepts the client port number as it's arguments,
     and while running, if contacted by a client, returns a chunk 
     of a file to the user.

OPERANDS
     The only operand is a valid unused port number. If no port 
     number is input to the program, the program will exit with
     an error.

EXIT STATUS

     0    No errors were detected.
     1    One or more errors were detected and error messages were
          printed.
 errno    If a man page call detects an error, perror prints a sys
          message and exits with return value of errno.


3. utils.c and utils.h
  -- basic library for printing debug statements
  -- error handling for read and write system calls.
  -- writes chunks of files and returns file size
  -- searches for files in a directory.

4. Makefile
   all:
       - compiles all included code.
       - gives a binexec for server and client

   clean:
       - removes all .o files

   wipe:
       - removes all .o files as well as all binexec files

   testcli:
       - runs the shell script that tests the client and server.
       - make sure that the server is running before testing
       - also make sure that the server ip and port number are correct
         for your usage. GRADER THIS WILL MATTER FOR YOU IF YOU USE THIS.

5. rudp.h and rudp.c
  -- basic lib for reliable udp handling.
  -- mainly thread serialization functions for passing structs to pthreads
  -- functions for sending ack and errors as well as datagrams.

6. lab3-app_protocol-mbaptist.pdf
    -- short documen describing my app layer protocol and how the client
       and server talk.

7. movecli.sh
  -- script that creates a client directory so that files can be  
     transfered into it with out overwriting the original files
     client binexec is moved into here.

8. lab3codedoc.pdf
  -- pdf with detailed description of code functions and variables 
     generated by doxygen. includes file list of program.
   

9. Github.
 -- All versions of code and interations of builds can be found at:
    https://github.com/mbaptist23/ce156lab3