No subject

The argument value:
http://www.linuxdoc.org/HOWTO/mini/IO-Port-Programming-2.html
"The last argument is a Boolean value specifying whether to give access
to the
program to the ports (true (1)) or to remove access (false (0))."
-- 
 |-----------------------------|
| Luis R. Hilario               |
| http://www.luisdigital.2y.net |
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Subject: [Fwd: [fpc-devel]Ports under Linux]
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Uses linux, ports;
// Program based on:
http://www.linuxdoc.org/HOWTO/mini/IO-Port-Programming-9.html

Const
 BASEPORT = $0378;  // Normally it is LPT1

begin
 // Get access to the ports: $0378..$037A
 if not (ioperm(BASEPORT, 3, 1)) then Halt(1);

 // Set the data signals (D0-7) of the port to all low (0)
 Port[$378] := 0;

 // Read the port of data. It must read the previous value, in this case
a zero.
 Writeln(Port[$378]);

 // We don't need the ports anymore.
 if not (ioperm(BASEPORT, 3, 0)) then Halt(1);

// Important note:
// Bit 5 of the control port ($37A) selects the direction (In or Out) of
the port of data.
end.

"Under LINUX, your program must be run as root, or the IOPerm call..."
In the documentation it must go "and" instead of "or".

-- 
 |-----------------------------|
| Luis R. Hilario               |
| http://www.luisdigital.2y.net |
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Marco van de Voort wrote:
> 
> > Under LINUX, your program must be run as root, or the IOPerm call must
> > be set in order to set appropriate permissions on the port access."
> >
> > I run the program as root. I must use IOPerm of any way?
> 
> Hmm, no, I think that the docs are correct.

Then the previous example would have functional?
If it is not thus, could put an example and include it in the manual. ?


About the error.
I talk about the part that says: "See also ioperm (2)".
Since it does not lead nowhere. Perhaps they wanted to talk about to
"iopl" (~>man iopl).

-- 
 |-----------------------------|
| Luis R. Hilario               |
| http://www.luisdigital.2y.net |
 |-----------------------------|

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