lha | LHa for UNIX - Note : This software | Translation library
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LHa for UNIX with Autoconf.
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QUESTION
I am learning C programming from "Learn c the hard way by Zed Shaw". He asks the learner to try and break their own code.
So I tried the following C code and thought printing more values that I gave argv will break it but it did not until later.
...ANSWER
Answered 2021-May-30 at 09:48A segmentation fault happens when the code try to access a memory region that is not available.
Accessing an array out of bounds doesn't means that the memory before or after the area occupied by the array is not available: The compiler or the runtime usually put all varibales or data in general in a given block of memory. If your array is the last item of such a memory block, the accessing it with a to big index will produce a Segmentaion Fault but is the array is in the middle of the memory block, you will just access memory used for other data, giving unexpected result and undefined behavior.
If the array (In may example, but valid for anything) is written, accessing available memory will not produce a segmentation fault but will overwrite something else. It may produce unexpected results or crash or segmentation fault later! This kind of bug is frequently very difficult to find because the unexpected result/behavior looks completely independent of the root cause.
QUESTION
I've been running docker-compose build for days, many times per day, and haven't changed my DOCKERFILEs or docker-compose.yml. Suddenly an hour ago I started getting this:
...ANSWER
Answered 2021-Apr-01 at 22:02mcr.microsoft.com is down at the moment
I'm receiving several different errors when pulling:
QUESTION
Attempt
After reading a large json file and capturing only the 'text'
column, I would like to add a column to dataframe and set all rows to a specific value:
ANSWER
Answered 2021-Feb-19 at 04:23The problem is that your read_json(....).text
line returns a series, not a dataframe.
Adding a .to_frame()
and referencing the column in the following line should fix it:
QUESTION
i have create an application in kivy with python and i would like it to run it to my phone.i use virtual box because i have window and is need Linux to run buildozer every time i run buildozer android debug i am facing an error. please if you can help me to solve that issue it will be very helpful thank here is the error i am facing:
...ANSWER
Answered 2021-Feb-15 at 14:33Looks like you are missing libssl-dev
. Just open your terminal and run the command sudo apt install libssl-dev
. You might have missed the buildozer dependencies. So even after installing libssl-dev
you get error then try running the following command:
QUESTION
Background
I am bringing up a Linux kernel via Yocto for some vendor-provided embedded hardware. I have configured the image to boot via fitImage with an initramfs and no rootfs (there is persistent storage but this is entirely for userspace application use). Think PXE live image and you won't be far off.
Things have been going well until my initramfs image crossed the ~128MB mark. Below this and everything boots as expected and all drivers are bound without issue. Above this mark and the kernel still boots but many drivers, though not all, are not bound. This is quite perplexing as all drivers are statically built into the kernel (no modules are used on this platform). Unfortunately, one of these modules runs the platform watchdog which causes entirely predictable reboots.
Thus far I have verified that all of the symbols are present in the vmlinux image:
...ANSWER
Answered 2021-Feb-13 at 23:24So, like most kernel issues the real problem was not where I thought it was. As it turns out, the problem was caused by one of the other drivers earlier in the init list hanging the core, preventing the watchdog driver from being registered. How this is affected by the initramfs is beyond me and is its own question.
For anyone who comes across this in the future, the answers to my specific questions above are listed below:
- How can I verify a given symbol is included in the final linux.bin?
I was not able to figure out how to do this statically. That said, I was able to print the addresses of the init functions at runtime by adding printk()
s to do_initcall_level
in init/main.c
. The addresses printed can then be compared to the output of objdump on vmlinux (see my question for the incantation).
A really useful and in-depth description of the initcall process can be found here.
Note that you can also turn on initcall_debug
, which will print each function name. In my case I wanted raw addresses which is why I chose the printk()
method.
- What mechanisms would affect inclusion or exclusion of a given symbol at build time?
Most of this boils down to your .config. The vast majority of inclusion / exclusion is done via the preprocessor. Other useful items are the linker script common header at include/asm-generic/vmlinux.lds.h
and the platform linker script at for your device arch//*/*.lds
.
- Which pieces of the kernel build and runtime are affected by initramfs size?
No idea on this one, still.
- Are there any other tools / techniques / tribal wisdom which can help debug this situation?
Don't panic
QUESTION
I'm trying to build an apk out of a simple kivy python file however I get this error when using the command "buildozer -v android debug" to build the apk.
I'm running on a Ubuntu virtual machine, java jdk is version 8 something, I was using version 14 earlier, but saw some post talking about needing version 8. Not entirely sure though if it was for the same problem that I'm facing.
...ANSWER
Answered 2021-Feb-13 at 11:05You were missing libffi-dev
earlier and now you are missing libssl-dev
. Looks like you might be missing other requirements for buildozer too. Follow the steps given in buildozer documentation
Open your terminal and run following commands:
QUESTION
Solution-
Add following env variables to the container
export PYSPARK_PYTHON=/usr/bin/python3.9
export PYSPARK_DRIVER_PYTHON=/usr/bin/python3.9
Trying to create a spark container and spark-submit
a pyspark script.
I am able to create the container but running the pyspark script throws the following error:
Exception in thread "main" java.io.IOException: Cannot run program "python": error=2, No such file or directory
Questions :
- Any idea why this error is occurring ?
- Do i need to install python separately or does it comes bundled with spark download ?
- Do i need to install Pyspark separately or does it comes bundled with spark download ?
- What is preferable regarding python installation? download and put it under
/opt/python
or useapt-get
?
pyspark script:
...ANSWER
Answered 2021-Feb-03 at 05:56Added following env variables to the container and it works
export PYSPARK_PYTHON=/usr/bin/python3.9
export PYSPARK_DRIVER_PYTHON=/usr/bin/python3.9
QUESTION
I have an odd issue where as of recently I am unable to run mkdir -p for a different user running as root and get the following error:
[root@ip-192-168-1-146 ~]# sudo -u myuser mkdir -p /some/target/path sudo: mkdir -p: command not found
When I test as the 'myuser' user the mkdir -p command works fine. I have additionally tried the following without success:
...ANSWER
Answered 2021-Feb-02 at 02:30so...no idea how it happened but somehow I pasted a special character M-BM- in place of a proper space char.
The M-BM- characters are an ASCII representation of byte sequence 0xc2 0xa0, which is the UTF8 encoding of unicode character A0 - a non-breaking space character. This character can be inserted in both LibreOffice and Microsoft Word documents using the key sequence Ctrl+Shift+SPACE.
¯\(ツ)/¯
QUESTION
Can anyone please resolve my issue I am using buildozer on a linux virtual machine to convert a .py file to apk for my android mobile
This is my first kivy project and i really need some help to make it possible
This is the code
...ANSWER
Answered 2020-Dec-18 at 12:12I guess you have your files in a directory named 'Lunar Aplocon'
. The space ' '
in the file name is causing the issue. Even when you enter the name in your buildozer.sec file try not to include any space (you can include in title but not in org and other info). So you just have to rename your directory then it will be just fine.
QUESTION
I made a simple python app using kivy and when I wanted to convert it to apk using buildozer it kept giving me this error. I searched everywhere but couldn't find any solution. Do you guys have any idea ? (stackoverflow is asking me to provide more details so don't mind this line. Below is the output I get when running the buildozer -v android debug command.)
...ANSWER
Answered 2020-Dec-13 at 17:52ValueError: storage dir path cannot contain spaces, please specify a path with --storage-dir
As it says, try using a directory without spaces in its name.
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