Hi, AFAIK there are three programming model that can be chosen on 64 bit environment. These models are LP64, ILP64, LLP64 Question 1) But how can I know which model is used on my system ? Question 2) Does long long data type is limited for LLP64 type model ? (My system is redhat 6.2 64bit) Thanks Pritam Bankar _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies