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Program Example20;
{ Program to demonstrate the fdRead and fdTruncate functions. }
Uses oldlinux;
Const Data : string[10] = '12345687890';
Var FD : Longint;
l : longint;
begin
FD:=fdOpen('test.dat',open_wronly or open_creat,octal(666));
if fd>0 then
begin
{ Fill file with data }
for l:=1 to 10 do
if fdWrite (FD,Data[1],10)<>10 then
begin
writeln ('Error when writing !');
halt(1);
end;
fdClose(FD);
FD:=fdOpen('test.dat',open_rdonly);
{ Read data again }
If FD>0 then
begin
For l:=1 to 5 do
if fdRead (FD,Data[1],10)<>10 then
begin
Writeln ('Error when Reading !');
Halt(2);
end;
fdCLose(FD);
{ Truncating file at 60 bytes }
{ For truncating, file must be open or write }
FD:=fdOpen('test.dat',open_wronly,octal(666));
if FD>0 then
begin
if not fdTruncate(FD,60) then
Writeln('Error when truncating !');
fdClose (FD);
end;
end;
end;
end.
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