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Re: Read/write IO ports on NT
- To: cygwin at cygwin dot com
- Subject: Re: Read/write IO ports on NT
- From: Corinna Vinschen <cygwin at cygwin dot com>
- Date: Tue, 24 Jul 2001 13:05:45 +0200
- References: <00bb01c11429$97024e90$0a090dc0@localhost>
On Tue, Jul 24, 2001 at 11:15:40AM +0100, Clive Mayo wrote:
> Hi
>
> Trying to read and write directly at IO port on NT, using the following code
>
> int main()
> {
> __asm("mov $1, %al");
> __asm("mov $0x3f8, %dx");
> __asm("out %al, %dx");
> return 0;
> }
>
> also tried
>
> int main()
> {
> _outp(0x378, 1);
> return 0;
> }
>
> but get the following exception, Privileged instruction.
> Any suggestions or pointers of how to code this.
You can't on NT. Use standard file IO.
Corinna
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Corinna Vinschen Please, send mails regarding Cygwin to
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Red Hat, Inc.
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