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QUESTION
I use python 3.8 on archlinux. I use shutil.copytree to copy a folder into a usb key. When i check into the usb after copy, the folder is correctly copied, but i see that my usb key that has a ticking led is still writing. If i eject my usb key before the ticking is over and reconnect it, i see that the folders are not entirely copied. Means that my OS (archlinux) thinks that the copy is done, but it's not. Any ideas ?
...ANSWER
Answered 2021-Jun-15 at 13:30It seems like the copy has logically finished, but hasn't been fully written to the physical USB flash drive. That is to say, your OS has cached some of the data from the copy, and will actually write it to the drive at a later time, but definitely before the drive is unmounted.
To check if this is the case, you can check (either within Python or through some other program) if the copy has completed once the code has moved on past shutil.copytree
. If it has, then the issue is almost certainly that the USB flash drive was not safely ejected.
You should be able to solve this by unmounting (i.e. safely ejecting) the USB flash drive before removing it.
QUESTION
I am writing an application that does packet sniffing using a Pcap library. For that to work, I need to give the java
binary network sniffing capabilities to avoid having to run it as root
:
ANSWER
Answered 2021-Jun-08 at 09:23I also posted my question on Reddit and someone suggested that such full thread dumps are displayed when the process receives a signal 3.
I was unable to detect that signal being sent to it by using strace
, but I did notice that running the code in command line rather than inside my IDE solved the issue.
I also tried sending a signal 3 to the program running in command line, and it does display the same full thread dump.
Kind of unsatisfactory ending, I'm not 100% sure what's happening, but I'm getting confident that this is a non-issue that I can ignore.
QUESTION
I wrote a simple c program that copies 10 million bytes from a file and pastes them in reverse order on another file (this is done one byte at a time, I know it's not efficient but it's just to make some tests), I don't understand why on linux it takes 2.5 seconds while on windows it takes more than 20 seconds. I run the same program changing only the paths. I use windows 10 and archlinux, the files are on an ntfs partition.
code on windows
...ANSWER
Answered 2021-Jun-02 at 17:41This is a great demonstration of how it's not the code we write that runs, it's the executable that the compiler makes from the code that runs.
It is possible that your Windows C compiler is not as advanced as your Linux C compiler, and is not optimizing your code as well as it could, or it's possible that the libraries that the Windows compiler is linking to for fread()
and fwrite()
are slower than the equivalent libraries in the Linux system.
If I had to put up my best guess, the Linux C compiler probably noticed that it would be more efficient to read more than one byte at a time, and it could do that without affecting the semantics of your program, and the Windows compiler either didn't infer the same, or wasn't able to optimize in the same way due to some underlying proprietary filesystem thing that only Microsoft engineers understand.
I can't say for sure without a peek at the disassembled binaries
QUESTION
My issue here is that my Xmobar says that it's "Updating..." when I provide the layout with a path to a C script (the executable)that I hacked together. I included Run Stdinreader and that made no dent on the issue.
I was under the impression that if a script can output to the terminal, it could to Xmobar. This C script is responsible for printing a quote to the terminal based on conditions specified. I don't need help with the script itself (although it is rushed and could be better constructed). I just want to know:
Is this an issue with an incompatibility with Xmobar and C? Or, did I forget to do something that will make the taskbar spit out the correct output?
My Xmobar Config is:
...ANSWER
Answered 2021-Jan-27 at 23:23Did more research today. The problem here is that %% counts as an argument to "run" something, but above it is where it's supposed to be defined. It's not.
I just used %diskspace% for a new script that outputs my Sink volume. It would work the same with the C script.
QUESTION
I wanna install gnome-terminal-transparency
package.
Here it is a link.
But my pacman
cannot find anything related to gnome-terminal-transparency
:
What's wrong?
...ANSWER
Answered 2021-May-28 at 08:29I use Manjaro (Arch based). I also cannot use the command "pacman" for AUR. I need to use the command "sudo pamac install
" to download packages from the AUR.
QUESTION
I'm trying to install the code from this git-repo for a university project and I'm stuck because ld does not seem to be able to link lua properly. I followed the install instructions and compile the code with:
...ANSWER
Answered 2021-May-19 at 13:22Lua can be compiled both as C ans C++ languages. This is an advertised feature of it. For that reason, Lua authors decided not to include the classic extern "C"
in the headers.
Your liblua5.2.so.5.2
library was compiled in C language and the symbols are not mangled. You compiled your application in C++ mode with just including Lua headers without extern "C"
, so your Lua included symbols are mangled.
Solution: wrap your include with extern "C"
:
QUESTION
I'm trying to compile a uvm project on my machine and I keep getting the following error message. I'm on Manajaro, I have multilib enabled on my system and I have followed the instructions on this page All the required dependencies are Installed.
I can start modelsim from commandline without any issues, but when I call this makefile, it always fails at the below line. Which makes me believe I might be missing something related to gcc, but I'm not sure what that is and googling this particular issue has yielded no results.
...ANSWER
Answered 2021-May-19 at 07:31This issues was caused by Modelsim using a different gcc version, manually deleting all the gcc-..*-linux folders from modelsim directory forced it to use my system GCC and that has solved the issue.
This solution was suggested here
Instead of manually deleting it, you can re-run the installer and choose to remove the GCC components. You will get the same result.
QUESTION
I am getting segmentation fault on below line of my code with stacktrace as stated below. self
is a unique_ptr
here.
ANSWER
Answered 2021-May-16 at 07:21The move(self)
itself is not problematic. It is the combination of a nested call to bind
and other arguments that access self
. The call to bind
empties self
before it is accessed by the other arguments.
You have two show-cases:
QUESTION
the title refers to this problem, I need to get the values under the keyword values of Tkinter TreeView using the method item as in: tree.item(v)['values'][0]
, v being my selection on the treeview. The method returns an integer, and if the value had zeros befores it just ignores them.
Heres an example of what I mean: I need the value marked in yellow exactly as it is (001) instead of (1). Printing this "tree.item(v)['values'][0]" will say the value it's 1 but the treeview shows the real value 001. How can I get the real value (001)?, Thank you.
This is the code:
...ANSWER
Answered 2021-May-15 at 06:35It looks like tkinter.ttk.Treeview always convert all items in values
into integer if possible.
Two related issues,
From ttk code, there's no way to stop the conversion by setting any options for it.
So hack code here, it may work for you. Place code after you import ttk
and before your use ttk.Treeview
.
QUESTION
I use an up to date Debian 10. I have unexpected behavior with python crypt.crypt
, some calls raise an OSError: Invalid Argument
exception, without further explanation, so I am not really sure what is happening.
ANSWER
Answered 2021-May-13 at 09:07The $2a
at the beginning of the salt is a marker of the blowfish/bcrypt method.
Blowfish is not supported by all Linux distros, like Ubuntu:
How to make Ubuntu's crypt(3) support Blowfish?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1349252
Debian does not support blowfish in crypt as of Debian 10 but should be able to do it in the next release, moving the dependency of crypt from glibc to libxcrypt:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=149452#42
https://blog.bofh.it/debian/id_458
How to solve the situation Attempt with passlibI made an attempt to use passlib with the verify
context whose prototype is like crypt.crypt
:
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