ref: 361febde1cb39a9df4ff8955d35b4bcccb5e1a8d
dir: /sys/src/ape/lib/ap/alpha/_seek.c/
extern long __SEEK(long long*, int, long long, int);
long long
_SEEK(int fd, long long o, int p)
{
long long l;
if(__SEEK(&l, fd, o, p) < 0)
l = -1;
return l;
}