Dan Mick wrote:
> Darren J Moffat wrote:
>> sreenatha wrote:
>>> Hi all,
>>> I am porting linux application to Solaris 10.
>>> Here I am facing the problem to find an equivalent of iopl() (Inpu /
>>> output privilage) function of Linux to Solaris 10.
>> Why does the application use iopl() on Linux ? What does it actually
>> do? I've read the Linux man page and I can't quite understand what it
>> does but I think the closest Solaris equivalent might be running with
>> the sys_devices privilege [ see privileges(5) ].
>
> There is an undocumented system call that gives IO privileges, which is
> probably what iopl() does. As such, you're on your own if you use it, but
> search the source for V86SC_IOPL.
Right - it was added for X servers to use, and the Xorg code on Solaris
calls that in the same place it calls iopl() on Linux. I still wonder
if anything should ever be calling that (and I know if we could ever make
X run without it, the security guys would be eager to remove that call as
soon as possible, as it's mere existence is a well-known security issue,
but one we've accepted living with for now).
xf86EnableIO() on Solaris/x86:
if (sysi86(SI86V86, V86SC_IOPL, PS_IOPL) < 0) {
xf86Msg(X_WARNING,"xf86EnableIOPorts: Failed to set IOPL for I/O\n");
return FALSE;
}
xf86EnableIO() on Linux/x86:
if (ioperm(0, 1024, 1) || iopl(3)) {
if (errno == ENODEV)
ErrorF("xf86EnableIOPorts: no I/O ports found\n");
else
FatalError("xf86EnableIOPorts: failed to set IOPL"
" for I/O (%s)\n", strerror(errno));
return FALSE;
}
--
-Alan Coopersmith- [EMAIL PROTECTED]
Sun Microsystems, Inc. - X Window System Engineering
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