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vm86old, vm86 - enter virtual 8086 mode
Contents
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 structvm86_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.
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.)
Library
Standard C library (libc, -lc)
Name
vm86old, vm86 - enter virtual 8086 mode
Return Value
On success, zero is returned. On error, -1 is returned, and errno is set to indicate the error.
Standards
Linux on 32-bit Intel processors.
Linux man-pages 6.9.1 2024-05-02 vm86(2)
Synopsis
#include<sys/vm86.h>intvm86old(structvm86_struct*info);intvm86(unsignedlongfn,structvm86plus_struct*v86);