After fixing thorpej's bug and ifdef'ing out the pmap_botch message (I
still want to know whether that's a suboptimality condition or a
possible-error condition, and why it's happening... I can provide more
data on just what mmap's are being performed if people want), Solaris
emulation seems to work fine (modulo an AFS misfeature regarding
directory entries).

My question is: how is emulation of binaries using the net supposed to
work?  They seem to fail opening /dev/tcp.  I can't find any
references in the mailing list archives or source code as to how to
set things up to fix this; I am particularly puzzled by the
svr4_netopen() function, which appears to address this issue directly
(translating a device open into a socket creation), but which also
appears to be referenced nowhere else in the kernel source tree.

Is this unfinished work?