Man page - vm86old(2)

Packages contains this manual

Available languages:

en fr it pl nl ja ru ro de

Manual

vm86

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
STANDARDS

NAME

vm86old, vm86 - enter virtual 8086 mode

LIBRARY

Standard C library ( libc , -lc )

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.)

STANDARDS

Linux on 32-bit Intel processors.