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0answers
15views
What is wrong with my Programming Syntax? i got no idea
I tried to get my new custom os working and i don't know how to get around it, if anybody else knows. I would like to get help.
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Why is my Stippled Line Code (C99/SDL2) not working properly?
A few weeks back i was prototyping something in SDL2 (using SDL Surfaces) to make stippled lines for my app PGM. I did conplete the code; At first I assumed it was working as intended but when i ...
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19views
QEMU's virtio-mouse-device not sending interrupts to xv6
I am trying to implement a GUI for xv6 operating system as a project for my school. I set up the GUI part and now need to implement the portion where the kernel picks up the mouse input and render the ...
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-2votes
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35views
How to prevent log corruption when multiple threads write to a file descriptor? [closed]
I'm building a multi-threaded HTTP server from scratch. Each request is logged to stdout, but when multiple threads print simultaneously, the logs get corrupted (e.g., entries interleave like this):...
0votes
1answer
93views
Pointer arithmetic in C [duplicate]
I had to predict the output of this code in a question :#include <stdio.h>int main( ) { int arr[] = { 10, 20, 30, 45, 67, 56, 74 }; int *i, *j; i = &arr[1]; j = &arr[5]...
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37views
Why is data written to the file even though the buffer is not full when the program finishes? [duplicate]
I expected that without calling fclose(), and with the buffer not being full, nothing would be written to the file. But when the program finishes, the data still appears in the file.Or the C runtime ...
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27views
Deadlock: multithreading with CPAchecker
I tried to find a way to verify deadlock with CPA checker. My goal is to check the "problem of philosofer".I found a lot of problem with CPA checker and threading.Someone can help me find ...
1vote
2answers
89views
storing all c stuct arrays in only one single memory segment obtained with malloc/calloc
Suppose I have a database in memory that I want to modify.Let's say the tables are phone information and items.The phone information consists of a name up to 99 characters and a character code.The ...
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1vote
1answer
53views
Why does `wprintf` replace non-ASCII characters with question mark `?` characters?
When running the following program (on Linux):#include <stdio.h>#include <wchar.h>int main() { wprintf(L"Hej hopp: %lc\n", L'ä');}...the program outputs Hej hopp: ?, ...
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1vote
1answer
86views
Why am I getting `-bash: ./animalprogram.bin: No such file or directory` on a fully built and linked program?
OK so I'm trying to create some educational content, and I seem to have come to an impasse myself. I'm building a very simple C / ASM project just to demonstrate linkage. All appears fine and well ...
1vote
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65views
How Can I remove "unnecessary" imports from a DLL in Visual Studio
I'm currently trying to make a dll for Windows 95. I am writing this app in C using Visual studio 2022 Community Edition. The Problem I am having is that there are a lot of imports from some dlls that ...
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1answer
51views
How to locate and overwrite EIP in a buffer overflow lab using GDB 14.2?
I have the following code as part of a buffer overflow CTF challenge:#define _GNU_SOURCE#include <stdio.h>#include <string.h>#include <unistd.h>int my_gets(char *buf) { int ...
2votes
1answer
61views
finding out how many processes are waiting on named semaphore
I found a toy program here (http://stackoverflow.com/a/16400833) to check out named semaphores. I modified it somewhat, opening the named semaphore in each child thread instead of in the parent ...
3votes
0answers
56views
C socket server code binds to INADDR_ANY but netstat shows it is only listening to one specific IP address [closed]
I have some old IPv4 C socket server code running on Linux that seemingly correctly binds to INADDR_ANY, but netstat -tuln | grep <port> shows that it's only listening to the specific IP address ...
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-3votes
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39views
Requesting a UDP Hole Punching example [closed]
Does anyone know if there some simple C (or any other language) code for a peer client and registry server?I want to test it and learn from an example.I asked an LLM it gave me this code: https://...
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