VM86(6)             Linux Programmer's Manual             VM86(6)



NAME
       vm86, vm86old - enter virtual 8086 mode

SYNOPSIS
       #include <sys/vm86.h>

       int vm86(unsigned long fn, struct vm86plus_struct *v86);

       int vm86old(struct vm86_struct *info);

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 (dos(s)).

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(6)