Posted by jpluimers on 2021/07/28
[WayBack] Frank A. Krueger on Twitter: “I made a build status IoT thing! Automatically polls @bitrise and is even Alexa controlled (for brightness and to turn off). Now I want to add github issue and PR counts. Just a $12 ESP32 and a $30 led matrix.”
[WayBack]
–jeroen
Posted in Development, DVCS - Distributed Version Control, ESP32, GitHub, Hardware Development, Software Development, Source Code Management | Leave a Comment »
Posted by jpluimers on 2021/07/28
There is a non-standard -r option to xargs that allows it to skip executing when there are no arguments at all.
On some operating systems, the -r is default.
MacOS has no -r, but does not execute xargs if there are no arguments given.
Posted in *nix, *nix-tools, bash, bash, Development, Power User, Scripting, Software Development, xargs | Leave a Comment »
Posted by jpluimers on 2021/07/28
Sometimes after a regular FastMM memory leak test report you get a dialog like this:
--------------------------- Unexpected Memory Leak --------------------------- An unexpected memory leak has occurred. The unexpected small block leaks are: 61 - 68 bytes: Unknown x 1 --------------------------- OK ---------------------------
The normal FastMM memory leak reporting dialog looks like this:
--------------------------- MyTestApplication.exe: Memory Leak Detected --------------------------- ... Note: Memory leak detail is logged to a text file in the same folder as this application. To disable this memory leak check, undefine "EnableMemoryLeakReporting". --------------------------- OK ---------------------------
Searching for “Unexpected Memory Leak” in RTL or FastMM code did not reveal results, but that might be me not doing a proper search.
One big problem is that the regular memory leak dialog is being suppressed by setting SuppressMessageBoxes to True (see for instance my blog post Application shutdown: wait for all threads to terminate or not? or [WayBack] delphi – Generating a FASTMM report WITHOUT the shutdown dialog – Stack Overflow).
However the “Unexpected Memory Leak” message box is always shown.
GETMEM.INC has an identifier LeakMessageTitle:LeakMessageTitle: _PAnsiChr = 'Unexpected Memory Leak';
FastMM4.pas, GETMEM.INC does not take into account SuppressMessageBoxes.FastMM4.pas, GETMEM.INC does take into account ReportMemoryLeaksOnShutdown.More on GETMEM.INC: [WayBack] delphi – Reporting memory leaks on shutdown with a console application – Stack Overflow
Versioned FastMM4.pas.
Not all allocations go via the memory manager. A complicating factor is that:
TMonitor.Create allocations go through SysAllocMem:class function TMonitor.Create: PMonitor; begin if CacheLineSize = 0 then AtomicExchange(CacheLineSize, GetCacheLineSize); if (CPUCount > 1) and (FDefaultSpinCount = 0) then AtomicExchange(FDefaultSpinCount, 1000); if CacheLineSize > SizeOf(Result^) then Result := SysAllocMem(CacheLineSize) else Result := SysAllocMem(SizeOf(Result^)); Result.FSpinCount := FDefaultSpinCount; end;
TMonitor.Destroy deallocations go through SysFreeMem:procedure TMonitor.Destroy; begin if (MonitorSupport <> nil) and (FLockEvent <> nil) then MonitorSupport.FreeSyncObject(FLockEvent); SysFreeMem(@Self); end;
Debugging this is easiest to set a breakpoint in the FastMM4.pas finalization section enabling a breakpoint group that has breakpoints on these methods inside GETMEM.INC:
function SysGetMem(Size: NativeInt): Pointer;function SysFreeMem(P: Pointer): Integer;function SysReallocMem(P: Pointer; Size: NativeInt): Pointer;function SysAllocMem(Size: NativeInt): Pointer;For inspecting for instance an asm construct like TSmallPoolBlockPoolHeader[edx], use a conversion PSmallBlockPoolHeader(Pointer(EDX))^,r
This will hide all the SysAllocMem related leaks:
unit FastMM4WrapperUnit; interface {$ifdef UseFastMM4} uses FastMM4, FastMM4Messages; {$endif UseFastMM4} implementation initialization // finalization // Disable GETMEM.INC reports that neglect SuppressMessageBoxes and NoErrMsg; this will effectively hide the leak as GETMEM.INC also does not write the leaks to a log file {$ifdef UseFastMM4} if SuppressMessageBoxes then begin {$WARN SYMBOL_PLATFORM OFF} NoErrMsg := True {$WARN SYMBOL_PLATFORM ON}; // no ShowMessage from the RTL (except for memory leaks) ReportMemoryLeaksOnShutdown := False; // No ShowMessage from the RTL in the GETMEM.INC teardown end; {$endif UseFastMM4} end.
Note that I tried embedding this in the then portion, but enabling IsConsole fails:
IsConsole := True; // can only force run-time error messages to be written to the console if the "Project/Options/Linking/Generate console application" is set.
The reason is that this does not allocate a console handle, so you really need to ensure the linker has allocated a console for you by enabling Project/Options/Linking/Generate console application (or option DCC_ConsoleTarget in the .dproj file)
For more details, see my post console – When is System.IsConsole true in Delphi? – Stack Overflow.
–jeroen
Posted in Conference Topics, Conferences, Delphi, Development, Event, FastMM, Software Development | Leave a Comment »
Posted by jpluimers on 2021/07/27
Lots of interesting profilers in [WayBack] Profiler and Memory Analysis Tools for Delphi – Stack Overflow:
--jeroen
Posted in Delphi, Development, Software Development | 2 Comments »
Posted by jpluimers on 2021/07/27
This is a continuation of yesterdays
Listing information on all active interfaces on MacOS part 1: getting the active interface names.
It is based on ideas in these StackExchange posts:
I threw most of the implementation details in the ideas away, as they were way to much based on empirical trial and error, than proper research.
So I tried doing the research and came up with the things below.
By using the ipconfig command, you can get specific details for a NIC like an IPv4 (with the getifaddr) or DHCP (with the getpacket option to get the latest DHCP packet):
for i in $(ifconfig -l -u); do if ifconfig $i | grep -q "status: active" ; then echo $i; fi; done | xargs -n1 -I_nic_ sh -c 'echo "_nic_: $(ipconfig getifaddr _nic_)"'
or DHCP/BOOTP:
for i in $(ifconfig -l -u); do if ifconfig $i | grep -q "status: active" ; then echo $i; fi; done | xargs -n1 -I_nic_ sh -c 'echo "_nic_: $(ipconfig getpacket _nic_)"'
The latter returns a very long list, which I wanted to shorten into a more readable format.
You can find more information in the [Archive.is] ipconfig(8) [osx man page] / [WayBack] ipconfig Man Page – macOS – SS64.com excerpt:
Posted in *nix, *nix-tools, Apple, bash, Development, DNS, ifconfig, Mac OS X / OS X / MacOS, Power User, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2021/07/23
Requires admin privileges, but can be worth your effort: [WayBack] [APP][5.0+][BETA] Island – app freezing, pri… | Android Development and Hacking
“Island” is a sandbox environment to clone selected apps and isolate them from accessing your personal data outside the sandbox (including call logs, contacts, photos and etc) even if related permissions are granted. Device-bound data is still accessible (SMS, IMEI and etc).
Isolated app can be frozen on demand, with launcher icon vanish and its background behaviors completely blocked.
Via:
–jeroen
Posted in Android, Android Devices, Development, Mobile Development, Power User | Leave a Comment »
Posted by jpluimers on 2021/07/22
Based on zzz but filters current user, and listener session.
:: https://stackoverflow.com/questions/36715033/how-to-logoff-all-users-on-windows-from-command-line-as-a-domain-administrator :: The findstr bit filters out the current session (starts with ">") and session 65536 (which is the listener) for /f "skip=2 tokens=2,3 delims= " %%a in ('query session ^| findstr /v /b ">" ^| findstr /v "65536 Listen"') DO ( echo %%a|findstr /xr "[1-9][0-9]* 0" >nul && ( logoff %%a ) echo %%b|findstr /xr "[1-9][0-9]* 0" >nul && ( logoff %%b ) ) goto :eof
–jeroen
Posted in Batch-Files, Development, Scripting, Software Development, Windows Development | Leave a Comment »
Posted by jpluimers on 2021/07/22
A few years back, Ken Thompson’s 1980 Unix password got cracked.
It took that long because his password p/q2-q4! had enough entropy by using uncommon characters so the crypt(3) based hash ZghOT0eRm4U9s was hard to crack.
The password was an opening chess move noted in the variety of the descriptive notation. A shorter notation would have been P-Q4, which would require months to crack in that era.
In modern chess notation, it would be 1. d4, moving the Queen’s Pawn from d2 to d4.
References (many interesting messages in the TUHS thread below):
Posted in *nix, B, C, Development, Power User, Security, Software Development | Leave a Comment »
Posted by jpluimers on 2021/07/22
Some highlights from [WayBack] console – When is System.IsConsole true in Delphi? – Stack Overflow:
Project/Options/Linking/Generate console application and {$APPTYPE CONSOLE} are two separate things. – [WayBack] Andreas Rejbrand.-cc commandline parameter for dcc32.exe (which could be in your ProjectX.cfg file!) is equivalent to “Generate console application):Found it: the executable has been created using
dcc32.exeand thedpr/cfgfile, thecfgcontains a line-cc
The linker option “Project/Options/Linking/Generate console application” is the same as “DCC_ConsoleTarget” in the .dproj file:
<PropertyGroup Condition="'$(Base_Win32)'!=''"> <DCC_ConsoleTarget>true</DCC_ConsoleTarget> </PropertyGroup>
Even setting IsConsole to True does not allocate a new console, so the STD_OUTPUT_HANDLE handle does not work!
The below method in the System unit, then does not show output:
procedure WriteErrorMessage; {$IFDEF MSWINDOWS} var Dummy: Cardinal; begin if IsConsole then begin with TTextRec(Output) do begin if (Mode = fmOutput) and (BufPos > 0) then TTextIOFunc(InOutFunc)(TTextRec(Output)); // flush out text buffer end; // Leave #0 off end of runErrMsg WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), @runErrMsg, Sizeof(runErrMsg) - 1, Dummy, nil); WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), @sLineBreak[1], 2, Dummy, nil); end else if not NoErrMsg then MessageBoxA(0, runErrMsg, errCaption, 0); end;
For console output, you have to enable the linker option DCC_ConsoleTarget allocates a console (if not yet allocated), enables the “STD_OUTPUT_HANDLE” handle, and sets IsConsole to True.
–jeroen
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »
Posted by jpluimers on 2021/07/21
If you get the below error when running hg.exe, then you are mixing a 64-bit Mercurial with 32-bit dependencies:
C:\>hg --version Traceback (most recent call last): File "hg", line 43, in File "hgdemandimport\demandimportpy2.pyc", line 150, in __getattr__ File "hgdemandimport\demandimportpy2.pyc", line 94, in _load File "hgdemandimport\demandimportpy2.pyc", line 43, in _hgextimport File "mercurial\dispatch.pyc", line 22, in File "hgdemandimport\demandimportpy2.pyc", line 248, in _demandimport File "hgdemandimport\demandimportpy2.pyc", line 43, in _hgextimport File "mercurial\i18n.pyc", line 28, in File "hgdemandimport\demandimportpy2.pyc", line 150, in __getattr__ File "hgdemandimport\demandimportpy2.pyc", line 94, in _load File "hgdemandimport\demandimportpy2.pyc", line 43, in _hgextimport File "mercurial\encoding.pyc", line 24, in File "mercurial\policy.pyc", line 101, in importmod File "mercurial\policy.pyc", line 63, in _importfrom File "hgdemandimport\demandimportpy2.pyc", line 164, in __doc__ File "hgdemandimport\demandimportpy2.pyc", line 94, in _load File "hgdemandimport\demandimportpy2.pyc", line 43, in _hgextimport File "mercurial\cext\parsers.pyc", line 12, in File "mercurial\cext\parsers.pyc", line 10, in __load ImportError: DLL load failed: %1 is geen geldige Win32-toepassing.
The equivalent English error is [WayBack] “ImportError: DLL load failed: %1 is not a valid Win32 application.” – Google Search.
The problem is the bitness of hg.exe: [WayBack] python – Error while installing Mercurial on IIS7 64bit: “DLL Load Failed: %1 is not a valid Win32 application” – Stack Overflow
You can quickly figure out the bitness of hg.exe:
C:\>where hg C:\Program Files\Mercurial\hg.exe C:\>sigcheck "C:\Program Files\Mercurial\hg.exe" Sigcheck v2.72 - File version and signature viewer Copyright (C) 2004-2019 Mark Russinovich Sysinternals - www.sysinternals.com c:\program files\mercurial\hg.exe: Verified: Unsigned Link date: 17:49 9-7-2019 Publisher: n/a Company: n/a Description: Fast scalable distributed SCM (revision control, version control) system Product: mercurial Prod version: 5.0.2 File version: 5.0.2 MachineType: 64-bit
Since I use chocolatey for most my installs, I forced x86 the Chocolatey way:
I was missing the
forcex86switch:
--x86, --forcex86 ForceX86 - Force x86 (32bit) installation on 64 bit systems. Defaults to false.
So after these:
choco uninstall --yes hg choco install --yes --force86 hg
I got this signature check:
C:\>sigcheck "C:\Program Files (x86)\Mercurial\hg.exe" Sigcheck v2.72 - File version and signature viewer Copyright (C) 2004-2019 Mark Russinovich Sysinternals - www.sysinternals.com c:\program files (x86)\mercurial\hg.exe: Verified: Unsigned Link date: 17:50 9-7-2019 Publisher: n/a Company: n/a Description: Fast scalable distributed SCM (revision control, version control) system Product: mercurial Prod version: 5.0.2 File version: 5.0.2 MachineType: 32-bit
–jeroen
Posted in Development, DVCS - Distributed Version Control, Encoding, Mercurial/Hg, Python, Scripting, Software Development, Source Code Management | Leave a Comment »
The Wiert Corner - irregular stream of stuff 