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    The following form allows you to view linux man pages.

    Command:

    vm86old

    
    
    

    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 appropriately.
    
    
    

    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 2009-02-20 VM86(2)

    
    
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