NAME    [Toc]    [Back]

       vm86, vm86old - enter virtual 8086 mode

SYNOPSIS    [Toc]    [Back]

       #include <sys/vm86.h>

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

       int vm86old(struct vm86_struct * info);

DESCRIPTION    [Toc]    [Back]

       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(1)).

RETURN VALUE    [Toc]    [Back]

       On  success,  zero is returned.	On error, -1 is returned, and errno is
       set appropriately.

ERRORS    [Toc]    [Back]

       (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    [Toc]    [Back]

       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)