💾 Archived View for gmi.noulin.net › man › man2 › vm86old.2.gmi captured on 2024-08-31 at 13:42:12. Gemini links have been rewritten to link to archived content

View Raw

More Information

⬅️ Previous capture (2023-09-08)

-=-=-=-=-=-=-

VM86(2)                                                                 Linux Programmer's Manual                                                                VM86(2)

NAME
       vm86old, vm86 - enter virtual 8086 mode

SYNOPSIS
       #include <sys/vm86.h>

       int vm86old(struct vm86_struct *info);
       int vm86(unsigned long fn, struct vm86plus_struct *v86);

DESCRIPTION
       The system call vm86() was introduced in Linux 0.97p2.  In Linux 2.1.15 and 2.0.28, it was renamed to vm86old(), and a new vm86() was introduced.  The definition
       of struct vm86_struct was changed in 1.1.8 and 1.1.9.

       These calls cause the process to enter VM86 mode (virtual-8086 in Intel literature), and are used by dosemu.

       VM86 mode is an emulation of real mode within a protected mode task.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set to indicate the error.

ERRORS
       EFAULT This return value is specific to i386 and indicates a problem with getting user-space data.

       ENOSYS This return value indicates the call is not implemented on the present architecture.

       EPERM  Saved kernel stack exists.  (This is a kernel sanity check; the saved stack should exist only within vm86 mode itself.)

CONFORMING TO
       This call is specific to Linux on 32-bit Intel processors, and should not be used in programs intended to be portable.

Linux                                                                          2021-03-22                                                                        VM86(2)