tamir@ucla-cs.UUCP (01/19/86)
BRL has a package that provides a System V emulation on top
of 4.2BSD. Has anyone written anything approximating a
4.2BSD emulation that runs on top of System V ?
If a complete emulation is not available, I am interested
in subroutine libraries, macro packages, etc that help
with porting programs from 4.2BSD to System V.
Any pointers would be appreciated.
In case it makes any difference, the particualr flavor of
System V I am interested in is the HP port to their HP9000/300
workstations which they call HP-UX.
Yuval Tamir
Internet: tamir@locus.ucla.edu
UUCP: {ucbvax,ihnp4,randvax, . . .}!ucla-cs!tamirgwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) (01/20/86)
> BRL has a package that provides a System V emulation on top > of 4.2BSD. Has anyone written anything approximating a > 4.2BSD emulation that runs on top of System V ? > > If a complete emulation is not available, I am interested > in subroutine libraries, macro packages, etc that help > with porting programs from 4.2BSD to System V. My feeling is that a sufficiently accurate user-mode emulation of 4.2BSD along the lines of the BRL package is not feasible. The terminal ioctls could be emulated moderately well, but you can't get the right signal behavior, [gs]etre[gu]id(), f*() system calls, etc. One way to port programs from 4.2BSD to UNIX System V is to edit the sources to work under the BRL package, and when the work is done just move the files to the target system. This should also help with porting to other systems, too, since the C and UNIX standards now being established look a lot more like System V than like 4.2BSD. If 4.nBSD (n > 3) does not start looking more like System V Release N (N > 2), I am afraid 4.nBSD's share of the UNIX world will dwindle to insignificance. That would put people who developed 4.nBSD- specific applications into quite a bind.