The seek system call is here
/sys/src/9/port/sysfile.c:855
The arg variable here is a pointer to the users stack making
the system call. most return values are 32 bit and are passed
back through syscall()
/sys/src/9/pc/trap.c:660
but seek is different, it overwrites 64 bits starting at the first arg
on the stack of the users seek call.
I am pretty sure I have this right, I am sure somone
will be correct me if I am wrong.
-Steve
