André van Schoubroeck a-v-s

Create a Wi-Fi hotspot on Linux using `nmcli`

Original post : https://unix.stackexchange.com/a/310699

nmcli con add type wifi ifname wlan0 con-name Hostspot autoconnect yes ssid Hostspot
nmcli con modify Hostspot 802-11-wireless.mode ap 802-11-wireless.band bg ipv4.method shared
nmcli con modify Hostspot wifi-sec.key-mgmt wpa-psk
nmcli con modify Hostspot wifi-sec.psk "veryveryhardpassword1234"

Linker error messages related to libc and libstdc++

We run into the dreaded

/usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.18' not found

error messages a lot around here. This article is an attempt to explain what's going on with that.

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

Ctrl-Key: ^[
Octal: \033
Unicode: \u001b
Hexadecimal: \x1B
Decimal: 27

Comparison chips (SoCs) table for ESP8266/ESP32/ESP32-S2/ESP32-S3/ESP32-C3/ESP32-C6

A minimal table to compare the Espressif's MCU families.

	ESP8266	ESP32	ESP32-S2	ESP32-S3	ESP32-C3	ESP32-C6
Announcement Date	2014, August	2016, September	2019, September	2020, December

Enable Dev Experiments in Discord for Windows

This guide shows how to enable dev mode for the Discord desktop application running on Windows (as of February 2022).

This can be used to view beta experiments to try features currently in development that are included but hidden by default in Discord release builds.

	/*
	* Qualys test program to check for presence of GHOST vulnerability
	* For more info: http://www.openwall.com/lists/oss-security/2015/01/27/9
	*/
	#include <netdb.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <errno.h>

	/*
	* g++ has_rtti.cpp -o has_rtti && ./has_rtti
	* g++ -fno-rtti has_rtti.cpp -o has_rtti && ./has_rtti
	* clang++ has_rtti.cpp -o has_rtti && ./has_rtti
	* clang++ -fno-rtti has_rtti.cpp -o has_rtti && ./has_rtti
	* @TODO: add msc++ cli, /GR, /GR-
	*
	* Copyright 2017, Andrew Domaszek
	* All rights reserved.
	* Program made available under BSD-new license.

	#!/bin/sh

	if [ $TARGET == "x86_64-unknown-linux-gnu" ]; then
	cargo build --target=$TARGET --release

	elif [ $TARGET == "x86_64-apple-darwin" ]; then
	cargo build --target=$TARGET --release

	elif [ $TARGET == "armv7-unknown-linux-gnueabihf" ]; then
	sh ./cross-linux-armhf.sh

	# OpenOCD script for GD32VF103 with improved reset procedure

	# Invoke it like this.
	# for Digilent HS2
	# openocd -f interface/ftdi/digilent-hs2.cfg -c "ftdi_device_desc {Digilent USB Device}" -f gd32vf103.cfg -c "program binary.elf verify reset exit"
	# openocd -f interface/ftdi/digilent-hs2.cfg -c "ftdi_device_desc {Digilent USB Device}" -f gd32vf103.cfg -c "program binary.bin 0x08000000 verify reset exit"
	# openocd -f interface/ftdi/digilent-hs2.cfg -c "ftdi_device_desc {Digilent USB Device}" -f gd32vf103.cfg -c "init; reset run; exit"

	# for SiPEED USB-JTAG/TTL ( RV-Debugger )
	# openocd -f interface/ftdi/minimodule.cfg -c "ftdi_device_desc {Dual RS232}" -f gd32vf103.cfg -c "init; reset run; exit"