[ns] large trace file size>2G

[Zhao Junmin]

when I run a simulation which last 1000s, It produces a big trace file
whose size is larger than 2G. But In linux,NS can't write >2G trace
file,so it exits abnormally. I search for some articles,which say  a
>2G file must be open with a O_LARGEFILE  flag set in linux.
here Is it a bug in NS?
How can I resolve  the problem better？
any suggestion for me and  I am very grateful!
Thanks!