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RedHat 9 (Linux i386) - man page for vm86 (redhat section 2)

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, and are used by dosemu.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
(for vm86old) EPERM Saved kernel stack exists. (This is a kernel sanity check; the saved stack should only exist within vm86 mode itself.)
CONFORMING TO
This call is specific to Linux on Intel processors, and should not be used in programs intended to be portable. Linux 2.1.15 1997-07-17 VM86(2)