vm86(2) System Calls Manual vm86(2)
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 intro-
duced. 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
This call is specific to Linux on 32-bit Intel processors, and should
not be used in programs intended to be portable.
Linux man-pages 6.03 2022-10-30 vm86(2)
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