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

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VM86(2) 			    Linux Programmer's Manual				  VM86(2)

       vm86old, vm86 - enter virtual 8086 mode

       #include <sys/vm86.h>

       int vm86old(struct vm86_struct *info);

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

       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.

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

       (for vm86old)

       EPERM  Saved  kernel  stack exists. (This is a kernel sanity check; the saved stack should
	      only exist within vm86 mode itself.)

       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)
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