Questions tagged [posix]

POSIX is an acronym for Portable Operating System Interface, a set of standards defining programming APIs and utility behavior for Unix-like operating systems.

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Implementation of GNU shuf(1) now supporting nul characters

Some time ago, I implemented shuf(1), but it had an issue: it ignored nul characters in the input. This new version tries to solve this problem (but uses the ...
3
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1answer
59 views

POSIX + BSD-extensions implementation of shuf(1)

I implemented GNU shuf(1) in C using POSIX system calls and some BSD extensions. You must compile it with -lbsd. ...
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0answers
35 views

sudoedit_enhanced written POSIX-ly (readlink possible problem?)

sudoedit_enhanced written POSIX-ly challenge While creating sudoedit_enhanced POSIX (apart from ...
2
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1answer
66 views

POSIX shell function to “dump” all given arguments

My today's idea was to create a POSIX shell function to dump all given arguments, typical use would be to call it from a fucntion, where you already know some arguments are not well set (empty; not ...
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4answers
1k views

Light task-processing systems with zero dependency for Linux systems

I made a prototype for a task processing systems. Architecture Worker - is a entity that is processing one-by-one tasks for the same processor. Processor - (also: executable, app) executable file (...
1
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2answers
82 views

Editing system files in Linux (as root) with GUI and CLI text editors #2 (final)

This is the second iteration of this question A note to start with: the first iteration of this question can be found here: Editing system files in Linux (as root) with GUI and CLI text editors As ...
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3answers
99 views

Safer & simpler allocation functions and macros

I wrote a bunch of functions and macros for safer and simpler allocation. They are documented in their files. Disclaimer: The library requires POSIX extensions, GCC extensions, and LIBBSD ...
4
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2answers
83 views

Generic circular doubly-linked list v2

I've improved, with help of the answers and comments, the linked list that I posted yesterday. It's been through a lot of changes, and is much more useful and safe now. I documented the linked list ...
2
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0answers
32 views

Bash script to scp specific, most-recent files from remote server

I'm writing a helper script that I wish to be able to share with my co-workers. We all work using macOS Mojave, but all have their own shell configurations. For example, I actually use ZSH and bash 5....
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3answers
1k views

Correctly applying the “rule of five” to a RAII socket wrapper

I was trying to create a simple RAII wrapper with rule of 5 for a TCP POSIX socket. My aim was to try learn how to apply rule of five in different situations, but this one was somehow tricky. ...
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1answer
60 views

Defining constants in the original standard of C [closed]

I'm learning C using Mike McGraths 3rd edition. I know the book is old but I want to have a better appreciation for the changes made to C through its timeline. The compiler error is error: ‘SYSTEM’ ...
5
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1answer
53 views

POSIX+ implementations of echo(1)

Ever wanted a strictly conformant echo(1) implementation on your system? Wait no more: I've built it! What is it? My first large-ish body of C code in a while. ...
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0answers
102 views

Console arkanoid in C

On an Internet forum a person came with their homework, to write Arkanoid in a console - it seemed they wanted someone to do their homework for them so I did not respond. However, I found the task ...
9
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1answer
247 views

Custom malloc implementation

I have a malloc() implementation that relies purely on mmap. I'm fairly sure that it doesn't overwrite any of the internal ...
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1answer
82 views

Bash Code to backup the history file in Linux [closed]

How is the logic, efficiency and can it be improved? This is a snippet from my .bashrc file, I just wrote it. The code is supposed to do this: Backup my ...
3
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2answers
82 views

POSIX shell function for asking questions

I've written a tiny function for asking questions intended for my POSIX shell scripts, where I often need user input. The function takes 2+ arguments, where: Is a string containing the question. , 3....
3
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1answer
49 views

batch add users to nextcloud on docker with csv

I have a working script that will batch add users to an instance of nextcloud running on top of docker. This version is the result of changes made after asking this question. I guess I'm looking for ...
2
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1answer
94 views

Editing system files in Linux (as root) with GUI and CLI text editors

My intention is to POSIX-ly write one generalized function for running various text editors I use for different purposes through sudoedit, i.e. editing files as ...
3
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1answer
24 views

Is device mounted? Both UUID and device names accepted

I am trying to write is_device_mounted script, which in turn will serve a greater purpose in my home Linux system. It does not even have an error reporting ...
2
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1answer
51 views

C Recursive Opendir Wrapper to Sort Directories First (ascending/descending)

A recent post on StackOverflow about a recursive directory listing which produced an unsorted mixed file/directory list, sparked the stray thought of "What would it take to write a wrapper for the ...
2
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2answers
56 views

Lock file and interrupt signals in POSIX shell script running indefinitely

This script is running indefinitely as the Linux background process. I have put an enormous effort to make this POSIX shell script containing an infinite loop shut down tidily along with the ...
2
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2answers
42 views

POSIX-ly finding a specific Java process

In this code I find a list all of the running java processes and give the below function a name to look for, it will do its best. But since I find my approach a ...
3
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1answer
65 views

Easy to use code preparation script for CodeReview questions

We all face questions that forget to include their code. Sometimes all of it, sometimes only parts, that make the rest of the question unfortunately incomplete and therefore off-topic. What if it was ...
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1answer
128 views

Detecting the total amount of RAM installed on a hardware from a Linux system using a POSIX shell script

Today, I gave myself a small task of detecting the total amount of RAM installed on a hardware from a Linux system using a POSIX shell script. I ended up using ...
0
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1answer
29 views

Shell POSIX OpenSSL file decryption script follow-up #3 (final)

From original very simplistic code: Shell POSIX OpenSSL file decryption script I learned a lot both from the first follow-up review, and the second one as well, many thanks! I just need one final ...
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1answer
49 views

Shell POSIX OpenSSL file decryption script follow-up #2

This question is the second follow-up of: Shell POSIX OpenSSL file decryption script The first follow-up was: Shell POSIX OpenSSL file decryption script follow-up #1 Both of which have proven very ...
26
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6answers
10k views

Create a C style char** from a C++ vector<string>

I am dealing with some older C style APIs, like Posix execve that take a char**. In the rest of my code, I prefer to use a ...
3
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2answers
115 views

Generic error handler function for POSIX shell scripts

Intention I came with the idea of generic, portable, highly reliable, and further customizable function for Shell scripts, written in POSIX, for error handling. Purpose The function shall find out, ...
1
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2answers
171 views

Long-term archiving + encrypting shell script

Yesterday, I very quickly, in an hour, wrote the very first version of my long-term archiving + encrypting shell script. I am aware it may have too many flaws, but none of them really prevent it from ...
5
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1answer
152 views

Lightshot Print Screen key linux handler - Follow-up #1

This question is a direct follow-up #1 of my previous question: Lightshot Print Screen key linux handler There were too many errors which I didn't see at the moment and I tried hard to fix them up ...
7
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4answers
931 views

Calculating linux based octal file permission

I'm applying for a mid level devloper position. In order to progress to 2nd interview, you need to pass a technical test. One of the questions was to write a function to work out linux based octal ...
3
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1answer
113 views

Lightshot Print Screen key linux handler

I haven't found any Lightshot Print Screen key linux handler publicly available. So, I decided to write one today. It is a standard POSIX shell script. I believe there is always space to get better, ...
5
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2answers
96 views

Goodgame Empire coin collector with random offsets in (almost-POSIX) Bash

Today, my goal was again to improve my POSIX shell scripting abilities. In one MMO game called Goodgame Empire, there is possible to code yourself a coin (tax) collector. But that's of less ...
0
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1answer
316 views

POSIX shell script for generating pseudo-random numbers

My today's goal was to further practice POSIX shell scripting. So, I decided to write the following POSIX shell script for generating pseudo-random numbers. Any and all reviews would be appreciated. ...
1
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1answer
101 views

Shell POSIX OpenSSL file decryption script follow-up #1

This question is the first follow-up of: Shell POSIX OpenSSL file decryption script Please read it before you continue reading this. Thank you. I only have one new problem solved and I would like ...
2
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0answers
62 views

Shell script to manage passwords

To get my feet wet with shell scripting I wrote this "minimal command line password manager" (aka pwm) taking inspiration from the well known ...
5
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1answer
146 views

Interactive Linux upgrade script

One year ago, I asked for a review of Simple Linux upgrade script in Bash. Conditions are slightly changed, and/or more accurate: Code readability for the code user, making it simple to adjust the ...
2
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2answers
46 views

How long a PID has been running (taking multiple inputs)

Tonight I tried to write a POSIX shell script which would allow me to check how long a process is running (via it's ID) and be able to handle multiple inputs: ...
5
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1answer
695 views

Shell POSIX OpenSSL file decryption script

Tonight, I tried to write a Bash OpenSSL file decryption script. Encryption script will follow in highly similar manner, so I think it's not necessary now. Let's suppose we have an encrypted large ...
2
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1answer
49 views

Implementing POSIX file mode library

I implemented a virtual file system library with POSIX file mode representation. Any suggestions regarding optimization are welcome. ...
3
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1answer
138 views

Shell script for reading /etc/passwd into SQLite

I want to read 4 columns, namely UID, GID, username and home directory of specific users from /etc/passwd into an SQLite database. I found this to create many ...
2
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1answer
3k views

C++ wrappers for execv(3)

Calling execv(3) (and similar functions) in C++ can be problematic. execv expects an array of const pointers to non-const ...
4
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0answers
898 views

SIGCONT Handler for terminal application

I'm writing a C++ application for POSIX environment with terminal-based User Interface. I'd like to make my application's UI be consistent between Ctrl-Z and ...
3
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1answer
77 views

Showing all programs' man pages

I'm trying to discover useful command line tools in Arch Linux, and it seems one good way of going about that is to look through all of the man pages related to ...
4
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0answers
31 views

Launch and place application depending on screen resolution

I got fed up off opening a set of applications when I wanted to code. So I decided to read up on AppleScript and came up with the following task for myself. Open a application of choice on a given ...
5
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0answers
127 views

Semaphore implementation by file locking in a bash script

This implementation is inspired by the POSIX functions sem_wait() and sem_post(). It tries to get rid of busy loops in the code ...
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1answer
2k views

Printing infinite loop using pthread [closed]

I'm trying to implement a c program using pthreads which prints "1 2 3 4 5" in an infinite loop. I have used conditional variables and mutex to synchronize the pthreads. I'm able to print "1 2 3 4 5" ...
0
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1answer
47 views

Split a file into individually allocated lines

This is part of a larger project that is to run on POSIX systems. My concerns with it are the lack of comments, best practices with the filesystem, and naming things. Of course all feedback is great. ...
3
votes
1answer
230 views

Running shell commands in a pipeline

I'm writing a shell in C for Linux and BSD. My code was unreadable before but I did a rewrite and now it is much more readable. The purpose of the code is to create a command pipeline and execute it. ...
-4
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1answer
66 views

Creating a struct

Mat told me to create a struct create a struct for the individual commands and arguments. It should have something like the "executable" name, number of args and arg list. Create a few ...