Computer Science 322
                         Quiz 4  -    Name   ____________________

1. The input parameter(s) passed INTO the pipe() system call is/are:

   a. A integer value representing  b. A pointer to an array of
      the pipe handle and another      two integers
      integer value representing the
      capacity of the pipe.

   c. The PID of the process to
      which to connect the pipe.

2. For a process to receive an End-of-file indication on reading
   a pipe, it is necessary that:

   a. at least one process              b. all processes that
      that has an open write handle        have the pipe open for reading
      close the write handle.              close the read handle

   c. all process that have an
      open write handle close the
      write handle.


Consider the following code segment:

1  pipe(pd);         ---------->  8 close(pd[1]);
2  rc = fork();      |            9 rc = fork();
3  if (rc == 0)      |           10 if (rc == 0)
4  {                 |           11 {
5     c1(pd[1]);     |           12    c2(pd[0]);
6     exit(1);       |           13    exit(1);
7  }        ----------           14 }
                                 15 wait(&status);
                                 16 wait(&status);

3. The way the program is presently written, after the c1 function
   closes pd[1],

   a. the c2 function will get      b. the c2 function will not
      eof if it tries to read          get eof if it tries to read
      the pipe.                        the pipe.

4. Now, suppose the close(pd[1]) is moved from its location at line 8
   and inserted between lines 9 and 10. In this case,
   after the c1 function closes pd[1],

   a. the c2 function will get      b. the c2 function will not
      eof if it tries to read          get eof if it tries to read
      the pipe.                        the pipe.

5. Now, suppose the close(pd[1]) is moved from its location at line 8
   and inserted between lines 2 and 3. Which best describes the
   situation now..

   a. the c1 function will not      b. the c1 function will be able
      be able to write into the        to write and the c2 function will
      the pipe.                        get eof when c1 closes pd[1].

   c. the c1 function will be able
      to write but the c2 function
      will not get eof when c1
      closes pd[1].