Questions tagged [undocumented-behavior]
Undocumented behaviour (or 'features') relates to elements of software not intended for use by end users (and therefore 'undocumented'), but left available for use by the vendor for software support and development.
undocumented-behavior
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Weird behavior dealing with c++ std::variant comparison and operator functions [duplicate]
I have been trying to make a game in Visual Studio using c++17, and I created a class type called ErrorType to represent all the error numeric values (nan, inf, etc). By using std::variant<long ...
- 69
1
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1
answer
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NtQueryDirectoryFile: Access Violation on Windows but not Wine
I've looked into using NtQueryDirectoryFile instead of FindFirstFile/FindNextFile to speed up directory iteration.
It's a commonly used tactic in software to use NtQueryDirectoryFile, so I implemented ...
user23724043
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0
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Permission Policy Header, Origin trial feature not enabled: browsing-topics
I've been working on a site in SvelteKit and noticed this new warn.
Error with Permissions-Policy header: Origin trial controlled feature not enabled: 'browsing-topics'.
I have never seen this in my ...
- 31
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Purpose of CONSOLE_REAL_OUTPUT_HANDLE macro
I read wincon.h header and I found two macros:
CONSOLE_REAL_OUTPUT_HANDLE (LongToHandle(-2))
CONSOLE_REAL_INPUT_HANDLE (LongToHandle(-3))
I've searched across the internet but still didn't find answer....
- 71
1
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Executing arbitrary JS code in a MATLAB Online session
TL;DR
Is it possible to get a handle to the web window containing a MATLAB Online session, from within it, to be able to execute arbitrary JS code?
MATLAB Online is a web-app version of MATLAB. As is ...
- 24k
0
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2
answers
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TerminateProcess with GetCurrentProcess() handle and with GetCurrentProcessId() handle
I'm studying Windows Internals. In fact, there's no similar _exit system call like in *nix.
The process should terminate itself with TerminateProcess/NtTerminateProcess.
ExitProcess/RtlExitUserProcess ...
- 71
2
votes
1
answer
899
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Importing named functions
Google Sheets has a new feature rolled out earlier called named functions and it is pretty useful. However, you need to manually import it into your sheet. I didn't see anything in the docs on how to ...
- 4,229
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Why does pandas.apply(id, axis=1) return the same id for all rows?
I'm actually facing some problem I cannot understand. Imagine this scenario:
df_mock = pd.DataFrame({'v': [[1,2,3],[4,5,6],[7,8,9]]})
class O:
def __init__(self, row):
self.row = row
def ...
- 277
1
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0
answers
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What is this `ConsoleHandle` HANDLE in my PEB?
I'm digging around in my process's PEB and I came across the so-called ConsoleHandle HANDLE in the nested RTL_USER_PROCESS_PARAMETERS struct. So far, I've compared this HANDLE to the standard input, ...
- 363
1
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0
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WSO2 API-manager returns 500 internal server error
I'm trying to use WSO2 to manage some APIs, i followed all the steps in the documentation, everything seems good until i tried invoke my first API that i've deployed on production, unfortunately it ...
- 11
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1
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How does the (undocumented) return_value argument for unittest.mock.patch work?
I've seen examples of unittest.mock.patch() and unittest.mock.patch.object() directly using a return_value argument.
Example:
with patch.object(ProductionClass, 'method', return_value=None) as ...
- 8,238
1
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1
answer
797
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Windows NtCreateFile returning STATUS_INVALID_PARAMETER (using undocumented NT syscall interface)
I thought it might be interesting/fun to write a program in assembly (for 64-bit x86, NASM) that uses the undocumented Windows NT system call interface. Unfourtunately, it appears as though somewhere ...
- 54
4
votes
1
answer
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Undocumented '-c' option for Bash's 'declare'?
I was playing around with Bash variables and mistakenly used the -c option (for const) to declare instead of the correct -r option to create a readonly variable. To my surprise, the variable retained ...
- 931
0
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1
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What is the range of hue values in `Color.init(hue:saturation:brightness:opacity:)`?
The Color initializer init(hue:saturation:brightness:opacity:) is undocumented.
I think I can safely assume that saturation, brightness, and opacity normalize to the range of 0...1, where values ...
- 31.8k
2
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1
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What is this bash built-in's printf's %a format specifier?
Using Bash 5.0.17(1)-release
Performing:
LC_NUMERIC=C printf '%a\n' 0.0
Outputs:
0x0p+0
Testing multiple values:
for v in 1.0 2.0 42.0 3.141592653589793
do LC_NUMERIC=C printf '%-20s %a\n' "$...
- 19.1k