If I run the following piece of code to an ia64 (azusa) I can see that
direct
io are not enabled, but please,
what do i have to do to have them running? 

remark: With ia32, this code works fine and I directly get:
------
"test:  completed" and the file "infile" is initialized

with ia64, it does not work and I get:
"write infile failed: Invalid argument"
... and the file "infile" is not filled up.

version:
Linux version 2.4.18 (xb@pegtst2) (gcc version 3.1) #8 SMP Wed Aug 7
14:30:09
CEST 2002

compil:
cc -O  -D_GNU_SOURCE voyons.c   -o voyons