Questions tagged [linux]
Use this tag for code that specifically targets the Linux operating system (consider [unix] for more portable code that should run on other Unix-like systems).
559
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A simple mmap(2) wrapper
I've written a wrapper for the mmap syscall. It's quite limited in functionality at the moment (there are lots of flags to support) but it's sufficient for mapping ...
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1
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32
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5
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3
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Implementation of recursive `ls` utility
Recently I wrote my own implementation of a utility for recursive output of the directories' contents, kind of similar to the ls Linux utility with the ...
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Debian and Docker compose upgrade script, 2nd version
As a continuation of this question, I would like a second review from you.
Here is the updated sh script:
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3
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1
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Single threaded epoll based coroutine library for C++, Linux
I've implemented a small single-header library over the C++20 coroutines. This library only works on a single thread and it is limited to Linux because it is also based on epoll.
The library does not ...
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Parsing gateway ip from `/proc/net/route` in a docker container
In try to replicate the outcome of the following command sequence using php:
netstat -rn | grep "^0.0.0.0 " | cut -d " " -f10
I did this using ...
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0
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Ansible role for installing and configuring SSH service
This is the Ansible role that installs and configures SSH service. What do you think about it? Is there something to improve? Thanks
defaults/main.yml
...
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4
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2
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253
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LKM: Extract cpu model name from /proc/cpuinfo
I wrote a small LKM that opens the /proc/cpuinfo file, reads it line by line, and attempts to the cpu model name.
If the function fails to extract the cpu model ...
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2
votes
1
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211
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Shell script to download multiple files from different URL's using for loop to download and verify files on each invocation
The expected behavior of the script is to download a file from a URL if the file is not present in the current directory and compare the md5 checksum of the file against the md5 checksum from the ...
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For loop to download files once and verify them on each invocation [duplicate]
The complete script works as expected. I am able to download and verify the files. If the file is all ready present verification is retested and downloads if necessary.
I'm in the process of teaching ...
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2
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2
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121
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Linux Script Set Permission Function
I wrote a simple script to set permissions for a file or folder for some embedded Linux devices as part of a larger setup script.
This method would be called on less than 20 files and folders. It ...
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0
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115
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Processing large blocklists with GNU Parallel
This is an ongoing project that has undergone a major update to speed up list processing. Here is the homepage for anyone interested!
It processes lists defined in ...
- 3,087
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1
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Improving Shell Installation Script
I'm currently working on a project and currently have this code. I already improved it by having some pointers, but I want to make it more professional looking and right. What should I implement next?
...
user270282
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1
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122
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Bash script that installs Arch Linux
I wrote a bash script that installs Arch Linux. I wanted to simplify the installation of the Arch Linux system by automating things like setting locale, hostname, networking, etc. This is my second ...
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0
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56
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a C/Python X server interface extension package
The project is named winlin; it's a portmanteau of the words window and Linux.
I'm working on a CPython extension to interact with the X server and manipulate windows. I don't have a ton of ...
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1
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Creating ZFS-based rootfs for installing Linux in Bash
I've written a bash script that creates a root filesystem on ZFS for installing Debian or Arch. The purpose of this script is to make it easier installing e.g. Arch without the need to make a ZFS pool ...
- 311
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2
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617
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RAII POSIX process created by fork
By analogy with std::thread, I've written an RAII POSIX process:
...
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2
answers
46
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Archive, compress, remove old archive file then remove source file if below set size
I'm working on a script that will archive, compress, clear old archive files, then remove the source file if it is below a set size. The output when I tested it worked, but I just wanted a second ...
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3
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A shell script to get the current battery status
Is this code well written? I'm not doing much, just rendering my battery status for my status bar but the code seems pretty long. I am new to Bash and Linux, so I thought this code could be improved ...
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1
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148
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Multiply two huge base-10 numbers in assembly
This post is a second part of my original post, Add two huge base-10 numbers, which deals with adding two huge base-10 numbers. However, in this case, I'm multiplying two non-negative whole numbers. ...
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1
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DmenuWacom: a front hand for wacom tablets
DmenuWacom
During my raids, I came across and solved several problems, obviously in my style, very similar to the suckless.org approach and which still works quite well. In fact, I started writing a ...
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1
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134
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declarative package manager for Arch Linux
pacdef is my declarative package manager for Arch Linux. I have written it since I often found myself discovering a new tool at one of my PCs, using it there for a ...
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1
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127
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Add two huge base-10 numbers
This is some assembly code I've written to add two base-10 numbers. The input and output are represented as null-terminated ASCII strings, with digits in big-endian order.
I have also provided ...
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3
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Remove leading zeroes from the beginning of a string
I want to remove leading zeroes (for a big integer library I'm currently making) in numbers represented as char arrays.
I chose assembly for speed, but in order to simplify making the algorithm and ...
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3
votes
1
answer
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Find proceses listening on the network outside of default package manager v2
So this is a follow up questions to Find proceses listening on the network outside of default package manager
I managed to make it a little faster thanks to using ...
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Find proceses listening on the network outside of default package manager
I have been tinkering with a script that should list things that are listening on the network, but are not part of the base packaging manager. Currently I have only done support for fedora and debian ...
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5
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1
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570
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Bash script simple countdown timer with dotted output
My goal is to have a timer function that operates from the bash linux command line. I am looking for review and feedback. Printing the expected number of characters (dots, dashes, or bars) is nice-...
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1
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97
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Iterate over a process' maps file
The following logic provides iteration over /proc/<PID>/maps for a Linux process. What I'm primarily (though not solely) interested in for this review is ...
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325
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2
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1
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142
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Priority Job/Task Queue for Linux (sockets and multithreading)
Preface
Please review my implementation of a job queue for linux/unix systems. This is my first time coding in C, although I have quite some experience in C++.
I know this is a moderate amount of loc, ...
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votes
1
answer
76
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Mount point API for Linux systems
I have a use case where I need to check, whether / is mounted read-only.
Here's the module where I implemented this check:
...
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1
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1
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129
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Simple networking framework in C++
Question: What do you think about this design and the implementation? This is a simple networking framework for IPv4, IPv6 TCP client and TCP server for Linux and MS-Windows in C++14. It uses a single-...
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votes
1
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116
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Simple networking framework in C
Question: What do you think about this design and the implementation?
This is a simple networking framework for IPv4, IPv6 TCP client and TCP server for Linux and MS-Windows in C. It uses a single-...
- 45
2
votes
2
answers
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touch command in C
I wrote a program in C that simulates the touch command from linux.
I would like to ask you to criticize my implementation, to find bugs in particular
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1
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100
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System V signal API using the standard POSIX API
I wrote a program that implements a POSIX signal API. It implements the functions sigset(), sighold(), ...
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2
answers
166
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nice utility in C
I implemented the nice linux command. How can I improve the program? In terms of optimization, error handling, bugs and possible undefined behaviors
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votes
1
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75
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improved "tee" utility
We have modified the tee program with your suggestions from the previous pull request. Did I implement well? I would like to optimize the program even more, what ...
- 299
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vote
1
answer
77
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daemon in a producer-consumer
The daemon program is associated with a message queue with a predefined key, to be blocked later when waiting for messages.
The two programs implement a producer-...
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1
answer
93
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Changing the attributes of a file
I wrote a program that changes the attributes of a file.
How can I make the program more efficient? Please find program problems. How can I improve the program?
...
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votes
2
answers
576
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Implementation of the "tee" utility program
How can I optimize the program? To make it more optimal? The program should be more optimal in terms of source code, compiled executable size, memory usage, speed, bugs etc. Please criticize the ...
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2
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another attempt to implement the tee command
I implemented the tee command from linux. The program implements the -a option
Reads standard input until end-of-file, write a ...
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3
votes
1
answer
64
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display processes children
The following program uses a parent program to determine the PIDs of multiple child processes. A function is called to return them to a dynamic vector (with the children's pids, but also the elements ...
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votes
3
answers
148
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tee: copy standard input to both stdout and a file
I implemented the tee command from linux. The program also handles the -a option for adding text to the end of a file if it ...
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2
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115
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change file attributes on a Linux file system with chattr
I am reading the book The Linux Programming Interface and I have reached the exercise in which the implementation of the chattr command in C is required.
I would ...
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1
answer
223
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implementation of the `mkdir` command with `-p` parameter in C
I wrote a program that implements the mkdir command with the -p parameter to create the parent directly if it does not exist.
My ...
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1
answer
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seq with range:
Is there a simpler way to get this result?
Also what is the syntax in fish for adding numbers to an array index before executing the lookup? ...
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0
answers
258
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Modifying a Linux touch driver to poll I2C data instead of using interrupts
I managed to modify the st1232.c touch driver to poll I2C data from the touch controller, instead of using interrupts. This way I don't need an extra interrupt wire. On the other side I am now using ...
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1
answer
286
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Base64 encoder in Assembly x86-64 Linux language
We were asked to create a Base64 encoder for Assembly x86-64 on Linux. Was wondering how my code below could be improved, be it notation or anything else. We only had Assembly for 3 months so I'm not ...
user197730
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Single-threaded coroutine in C (Linux x86-64)
Background Story
I crafted a simple single-threaded coroutine in C, running on Linux x86-64.
Short Technical Explanation
1) Task
There are two types of tasks in this implementation.
Main task. This ...
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2
answers
104
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Retrieve Logs from Multiple Containers on Remote Server
Recently I had the requirement to allow multiple containers of the same application to be run on a single development server. This requirement drastically changed how we retrieve logs over SSH from ...
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