[fpc-pascal] errno codes fpOpen

[afpTeam]

Hi,

I'm maybe lost in the doc searches, but is there a reference explaining the
extended err codes for fpOpen and friends?
I could not find one.

The effort is a Linux/Pentium fifo read by cgi but fails to read a piped
fifo built with RW permission / shared.

cgi:

Program pipe_read;
 uses BaseUnix,Unix;
 var FD: Cint;
 s:string[255];
    begin
        writeln ('Content-type: text/html');
        writeln;
        FD:=fpOpen ('/tmp/BlaBla,O_RdOnly or O_NonBlock);
        writeln ('start...');
        if FD>=0 then
            begin
                fpread(FD,s,255);
                writeln(s);
            end
    else
        Writeln ('Error : ',fpgeterrno);
        Writeln ('The script exited with status : ',fpClose (FD));
        writeln ('done');
end.

Results...
FpMkfifo : -1<- setup fifo pipe,ok
start...3(handle to pipe)
PID > 0<-server returned
The script exited with status : 0


Thanks,

Mike