Dear all,
Atached is a small unit that makes debugging cgi applications easier. When
used in a program it will as part of the initialization launch a new process
which opens a terminal (windows:cmd, linux:xterm) and starts gdb attaching
to the calling proces. A short "sleep" makes sure gdb breaks the program
while still initializing. It has been tested on windows xp32 with apache 2.2
running as an application or as a service and on ubuntu 10.04 64 with apache
2.2.
Further instructions are in the unit.
I've also tested this unit sucessfully in a windows library. It helps
debugging of dll's where the "Host Application" method fails.
Ludo
unit SelfDebug;
{
Instructions:
-Include unit anyware in the program.
-Change DEBUGGER constant to match your debugger
-For Windows, if the program to debug is running as a service (fe. CGI
application
from apache running as a service), make sure the service is configured with
"Interact with desktop" checked. Failing to do so, the debugger will be started
without a console, break the program and hang waiting for input. Killing the
debugger
is your only option.
-For Linux, if the program to debug is running as a different user (fe. CGI
application),
run "xhost +" in a terminal to enable all users to connect to xserver.
If needed, change DISPLAY to match your DISPLAY environment variable
}
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils,Process;
implementation
const
{$ifdef windows}
DEBUGGER='C:\lazarus\mingw\bin\7.3\gdb.exe';
{$endif}
{$ifdef linux}
DEBUGGER='gdb';
DISPLAY=':0.0';
{$endif}
MSWAIT=2000;
var
AProcess: TProcess;
initialization
AProcess := TProcess.Create(nil);
{$ifdef windows}
AProcess.CommandLine := format('cmd /C START "Debugging %s" /WAIT "%s" "%s"
%d"',[paramstr(0),debugger,paramstr(0),GetProcessID]);
{$endif}
{$ifdef linux}
AProcess.CommandLine := format('xterm -display %s -T "Debugging %s" -e "%s"
"%s" %d',[DISPLAY,paramstr(0),DEBUGGER,paramstr(0),GetProcessID]);
{$endif}
AProcess.Execute;
sleep(MSWAIT);
finalization
AProcess.Free;
end.
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