calvin2021y

Install `dnsmasq` and configure for *.dev.local domains

$ brew install dnsmasq
$ vim /usr/local/etc/dnsmasq.conf

Reload configuration and clear cache

# Copy the daemon configuration file into place.
$ sudo cp $(brew list dnsmasq | grep /homebrew.mxcl.dnsmasq.plist$) /Library/LaunchDaemons/

$ sudo launchctl unload /Library/LaunchDaemons/homebrew.mxcl.dnsmasq.plist

Note: these instructions are for pre-Sierra MacOS. Sierra (10.12) and newer users see https://gist.github.com/gravitylow/fb595186ce6068537a6e9da6d8b5b96d by @gravitylow

If you are getting this in gdb on OSX while trying to run a program:

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

FFmpeg Minimal Build for RTMP Streaming

This tutorial will work you through steps of configuring an FFmpeg build tailored for RTMP streaming on macOS. At first I think of making it support general live streaming, with additional protocols like HLS, but to keep things simple let's stick with RTMP for now. (Anyway, I do include HLS in the protocol list as well as some related bitstream filters but it's untested.)

Goal

The built FFmpeg executable should

Full Source Code: https://github.com/varunon9/DynamicWallpaper/tree/always_running_service

Steps-

Create a Foreground Service (MyService.java)
Create a Manifest registered Broadcast Receiver (MyReceiver.java) which will start your Foreground Service
In onDestroy lifecycle of MyService, send a broadcast intent to MyReceiver
Launch the MyService on app start from MainActivity (see step 8)
With above 4 steps, MyService will always get re-started when killed as long as onDestroy of Service gets called
onDestroy method of Service is not always guaranteed to be called and hence it might not get started again

Backup android app, data included, no root needed, with adb

adb is the Android CLI tool with which you can interact with your android device, from your PC

You must enable developer mode (tap 7 times on the build version in parameters) and install adb on your PC.

Don't hesitate to read comments, there is useful tips, thanks guys for this !

Fetch application APK

This is a simple example program using the foundationdb C API. Its written & tested on macos; but it should be easy to adapt to work on BSD / linux.

This also demonstrates using libuv to integrate foundationdb into a run loop. Promises are run in the main libuv loop.

Compile with

$ clang test.c -Wall -lfdb_c -I/usr/local/include -luv

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

pg_dump is a nifty utility designed to output a series of SQL statements that describes the schema and data of your database. You can control what goes into your backup by using additional flags.
Backup: pg_dump -h localhost -p 5432 -U postgres -d mydb > backup.sql

Restore: psql -h localhost -p 5432 -U postgres -d mydb < backup.sql

-h is for host.
-p is for port.
-U is for username.
-d is for database.

	/*
	For any 1<k<=64, let mask=(1<<k)-1. hash_64() is a bijection on [0,1<<k), which means
	hash_64(x, mask)==hash_64(y, mask) if and only if x==y. hash_64i() is the inversion of
	hash_64(): hash_64i(hash_64(x, mask), mask) == hash_64(hash_64i(x, mask), mask) == x.
	*/

	// Thomas Wang's integer hash functions. See <https://gist.github.com/lh3/59882d6b96166dfc3d8d> for a snapshot.
	uint64_t hash_64(uint64_t key, uint64_t mask)
	{
	key = (~key + (key << 21)) & mask; // key = (key << 21) - key - 1;