 * This is a test for Sun Solaris asynchronous I/O interface()
 * A file is open, data of it is read into memory,
 * some operation is done on it, finally the modified data is written 
 * to its original position.
 * We uses three buffers, one for read, one for write, and one for
 * operation. Currently the operation is qsort it. 
 * 
 * test source files are:
 * asyn_io.test.c  for asynchronous read/write
 * syn_io.test.c   for synchronous read/write
 *