instability in Berkeley versus AT&T releases

[Peter DaSilva]

> > Surprise, Guy, but 4.2BSD really CAN run many V6 binaries. ...However, this
> > is misleading.
> 
> Certainly is.  4.2BSD can run PDP-11 V6 binaries (there are other V6
> binaries), but V7 can't.  ("stat" changed radically, and unlike the
> V7/4.2BSD change to "stat" it isn't source-compatible or binary-compatible.
> "seek" got replaced by "lseek".)  4.2 can do it because the
> compatibility-mode emulator simulates the system calls, and can simulate V6
> calls as well as V7 ones.

Fine, as long as it doesn't use stat, sgtty, or lseek it's OK. How many
programs use stat, sgtty, or lseek? Mainly system programs, which will
come with the new system.