good links here:
http://www.unix.org/version2/whatsnew/lp64_wp.html
http://www.unix.org/version2/whatsnew/login_64bit.html
Datatype | LP64 | ILP64 | LLP64 | ILP32 | LP32 |
char | 8 | 8 | 8 | 8 | 8 |
short | 16 | 16 | 16 | 16 | 16 |
_int32 | 32 | ||||
int | 32 | 64 | 32 | 32 | 16 |
long | 64 | 64 | 32 | 32 | 32 |
long long | 64 | ||||
pointer | 64 | 64 | 64 | 32 | 32 |