2010.01.12
Added two test programs to read the /proc/xtime procfile with an fgets
and compare the times with what gettimeofday system call returns.

  insmod ./procfsreadxtime.o    insert the module
  lsmod                    see if the modules has loaded

  ./procfsreadxtime        read the /proc/xtime and display
  ./comparetimeofday       compare /proc/xtime with gettimeofday

  rmmod procfsreadxtime    unload module
  lsmod                    see if the modules has unloaded

2010.01.12
Revised to pass back xtime.tv_sec and xtime.tv_usec together as a string.

Change the test sequence below to 
  insmod ./procfsreadxtime.o    insert the module
  lsmod                    see if the modules has loaded
  tail /var/log/syslog     see module load message
  ls /proc/xtime           see if the file /proc/test is there

  cat /proc/xtime          read the procfile, watch count go up.
  cat /proc/xtime          read the procfile, watch count go up again.
  cat /proc/xtime          read the procfile, watch count go up again.

  tail /var/log/syslog     see module read messages
  rmmod procfsreadxtime    unload module
  lsmod                    see if the modules has unloaded
  less /var/log/syslog     see module unload message. Read all the
                            messages produced by this module.

2010.01.12
Note that "leaving via shortcut" is not really what is happening. The
early return test is simulating an end of file. File IO system calls
keep reading until an EOF is encountered, which is interpreted as
a zero length is returned. The test just makes
sure that after exactly one read the proc file read function returns
zero so the file IO system function gets the EOF that it is looking 
for.

2009.07.27
Seems to work OK, but does two "leaving via shortcut" calls instead of one.
Why is that? This needs to be explained and then fixed.


  insmod ./procfsread.o    insert the module
  lsmod                    see if the modules has loaded
  tail /var/log/syslog     see module load message
  ls /proc/test            see if the file /proc/test is there

  cat /proc/test           read the procfile, watch count go up.
  cat /proc/test           read the procfile, watch count go up again.
  cat /proc/test           read the procfile, watch count go up again.
  tail /var/log/syslog     see module read messages
  rmmod procfsread         unload module
  lsmod                    see if the modules has unloaded
  less /var/log/syslog     see module unload message. Read all the
                            messages produced by this module.