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{ ----------------------------------------------------
DbgIntfPsuedoTerminal.pp - Debugger helper class
----------------------------------------------------
This unit contains a helper class for a console containing a program being debugged.
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA. *
* *
***************************************************************************
}
unit DbgIntfPseudoTerminal;
{$mode objfpc}{$H+}
{$IFDEF linux} {$DEFINE DBG_ENABLE_TERMINAL} {$ENDIF}
interface
uses
Classes, SysUtils
{$IFDEF DBG_ENABLE_TERMINAL}
, IDEMiniLibC, BaseUnix
{$ENDIF}
;
type
{ TPseudoTerminal }
TPseudoTerminal = class
{$IFDEF DBG_ENABLE_TERMINAL}
private
FDeviceName: string;
FOnCanRead: TNotifyEvent;
FPTy: Integer;
FReadBuf: String;
procedure CloseInp;
public
constructor Create;
destructor Destroy; override;
procedure Open;
procedure Close;
function Write(s: string): Integer;
function Read: String;
procedure CheckCanRead;
property OnCanRead: TNotifyEvent read FOnCanRead write FOnCanRead;
property DevicePtyMaster: integer read FPty;
property Devicename: string read FDeviceName;
{$ENDIF}
end;
implementation
{$IFDEF DBG_ENABLE_TERMINAL}
{ TPseudoTerminal }
procedure TPseudoTerminal.CloseInp;
var
ios: termios;
begin
// Based on MSEGui
if FPTy = InvalHandle then exit;
tcgetattr(FPty, @ios);
ios.c_lflag:= (ios.c_lflag and not (icanon)) or echo;
ios.c_cc[vmin]:= 0;
ios.c_cc[vtime]:= 0;
tcsetattr(FPty, tcsanow, @ios);
//foutput.writeln('');
end;
constructor TPseudoTerminal.Create;
begin
FPTy := InvalHandle;
end;
destructor TPseudoTerminal.Destroy;
begin
Close;
inherited Destroy;
end;
procedure TPseudoTerminal.Close;
begin
CloseInp;
if FPTy <> InvalHandle
then __Close(FPTy);
FPTy := InvalHandle;
end;
procedure TPseudoTerminal.Open;
const
BufLen = 100;
var
ios: termios;
int1: integer;
procedure Error;
begin
if FPTy <> InvalHandle
then __Close(FPTy);
FPTy := InvalHandle;
FDeviceName := '';
end;
begin
Close;
FPTy := getpt;
if FPTy < 0 then Error;
if (grantpt(FPTy) < 0) or (unlockpt(FPTy) < 0) then begin
Error;
exit;
end;
setlength(FDeviceName, BufLen);
if ptsname_r(FPTy, @FDeviceName[1], BufLen) < 0 then begin
Error;
exit;
end;
setlength(FDeviceName,length(pchar(FDeviceName)));
if tcgetattr(FPTy, @ios) <> 0 then begin
Error;
exit;
end;
ios.c_lflag:= ios.c_lflag and not (icanon); // or echo);
ios.c_cc[vmin]:= 1;
ios.c_cc[vtime]:= 0;
if tcsetattr(FPTy, tcsanow, @ios) <> 0 then begin
Error;
exit;
end;
int1 := fcntl(FPTy, f_getfl, 0);
if int1 = InvalHandle then begin
Error;
exit;
end;
if fcntl(FPTy, f_setfl, int1 or o_nonblock) = InvalHandle then Error;
end;
function TPseudoTerminal.Write(s: string): Integer;
var
int1, nbytes: Integer;
p: PChar;
begin
nbytes := length(s);
if (FPTy = InvalHandle) or (nbytes = 0) then exit(0);
Result:= nbytes;
p := @s[1];
repeat
int1 := __write(FPTy, p^, nbytes);
if int1 = -1 then begin
if errno <> eintr then begin
Result:= int1;
break;
end;
continue;
end;
inc(p, int1);
dec(nbytes, int1);
until integer(nbytes) <= 0;
end;
function TPseudoTerminal.Read: String;
const
BufLen = 1024;
var
buf: String;
i: Integer;
begin
if (FPTy = InvalHandle) then exit('');
SetLength(buf, BufLen + 1);
Result := FReadBuf;
FReadBuf := '';
repeat
i := __read(FPTy, buf[1], BufLen);
if i > 0 then Result := Result + copy(buf, 1, i);
until i <= 0;
end;
procedure TPseudoTerminal.CheckCanRead;
begin
FReadBuf := Read;
if (FReadBuf <> '') and assigned(FOnCanRead)
then FOnCanRead(self);
end;
{$ENDIF}
end.
|
