Description:
Please refer to 8.10, page 299.
This exercise asks you to modify program 8.16 such that it does asynchrous read and asynchrouns write. The main thread can be just reading from stdin, and writing to stdout, until EOF.
A possible scenario:

  $ ./a.out  infile  outfile    <----- copy infile to outfile
  hello i'm klim                       with async read and async write
  hello i'm klim          <---- read stdin and echo it to stdout ...
  ...
  ...
  [Copy completed]        <------ when the copy is completed, show something 
  ..                              to screen
  ..
  ^D
  $

In order to simulate a slow device, the periodicasterisk (program 9.7) has been modified such that it will read a char from stdin and write it to stdout in argv[1] times per second.
Through FIFO, it can be cooperated with this exercise as follows:

  1st shell:
     $ ./a.out infile FIFO     <-----   the contents of infile is sent to FIFO
     hello klim
     hello klim 
     .......

  2nd shell:
     $ ./periodicchars 12  < FIFO
     ....... <---- the contents of infile is shown here 
                   in the rate of 12 chars per second

deadline: 2010/May/27, 00:05 am