Re: [announce] dosemu-1.3.2

[Stas Sergeev <stsp@aknet.ru>]

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Hello.

Zoltan Boszormenyi wrote:
> eject the CD util I exit dosemu. The dosemu internal eject
> command didn't work.
The problem is most likely not
in dosemu itself (kernel? udev?)
Dosemu does what's the attached
simple test-case does, which
fails on FC3 too.

> I have a question. At present, dosemu doesn't run on Linux/x86-64
> (in 64-bit mode) as the vm86 mode is disabled on the hardware.
> How hard would it be to write an in-kernel vm86 emulation?
There are the already-written
CPU emulators. I was playing around
the qemu, which has the vm86()
syscall emulation. It was possible
to run dosemu entirely under the
qemu user-mode emulation, so it
was very promising. I almost got
it to work inside the dosemu, but
at some point its author abandonned
the user-mode support and dosemu
no longer runs under it, and so
I had to abandon my porting effors.
If/when (which is now unlikely)
qemu is fixed, I'll probably look
up that code and complete the work.
There are the other CPU emulators
too, but qemu have the ready-to-use
vm86() emulation, not just the CPU
emulation, so it is the primary
target of course.

Another interesting thing would be
to have the Windows port - someone
already built the dosemu with help
of coLinux, and it even worked.


[-- Attachment #2: cd.c --]
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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/cdrom.h>

int main() {
  int fd;
  if ((fd = open("/dev/cdrom", O_RDONLY)) < 0) {
    perror("open");
    return 1;
  }
  if (ioctl(fd, CDROMEJECT)) {
    perror("ioctl");
  }
  return 0;
}