efvincent

Using DSLR as a webcam on Arch/Manjaro Linux

Many thanks to Ben Chapman and his blog post How to Use Your DSLR Camera as a Webcam in Linux.

v4l2loopback is a linux kernel module that allows you to create "virtual video devices". Kernel modules are pieces of code that can be loaded and unloaded into the kernel upon demand. They extend the functionality of the kernel without the need to reboot the system.

Compatibility

Supported Cameras

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Inductive partial_map : Type :=
| Empty
| Binding (k : nat) (v :  nat) (m : partial_map).

(** update given in the lecture. map will continue to grow, updated
    pairs aren't removed - not a realistic representation is it? *)
Definition update' (k v : nat) (m : partial_map) : partial_map :=
  Binding k v m.

(** alternative that replaces the updated node at the key *)

efvincent

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"

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/* repro:

1. compile with $ cc -std=c99 -ggdb3 -Wall hw.c -o hw
1a. also tried with clang, same thing
2. debug with $ gdb hw
3. step into main (gdb) start

you'll get some variation of a hang like this:

  Temporary breakpoint 1 at 0x100003f6f: file hw.c, line 4.

efvincent

{
/*
	// Place your snippets for PureScript here. Each snippet is defined under a snippet name and has a prefix, body and 
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the 
	// same ids are connected.
	// Example:
	"Print to console": {
		"prefix": "log",
		"body": [

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#NoEnv          ; Recommended for performance and compatibility with future AutoHotkey releases.
#Warn           ; Enable warnings to assist with detecting common errors.
SendMode Input  ; Recommended for new scripts due to its superior speed and reliability.

;
; This assumes the CTRL and ALT keys have been switched using registry mapping. KeyTweak does the job
; if you don't want to manually tweak the mappings in the registry yourself.
;

^q::WinClose, A     ; Close the current Window using CTRL-Q like on the mac

efvincent

#pragma warning disable 1584,1711,1572,1581,1580

using System;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Serialization;

namespace Cfx.Core {
    /// <summary>
    /// Provides a means to store data in a logical context. 
    /// </summary>

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type Result<'T,'TError> =
| Ok of ResultValue:'T
| Error of ErrorValue:'TError

let map (fn:'T -> 'U) (result:Result<'T, 'TError>) =
   match result with
   | Ok r ->  Ok (fn r)
   | Error e -> Error e

[<CompiledName("MapError")>]

efvincent

SELECT files.physical_name, files.name, 
  stats.num_of_writes, (1.0 * stats.io_stall_write_ms / stats.num_of_writes) AS avg_write_stall_ms,
  stats.num_of_reads, (1.0 * stats.io_stall_read_ms / stats.num_of_reads) AS avg_read_stall_ms
FROM sys.dm_io_virtual_file_stats(2, NULL) as stats
INNER JOIN master.sys.master_files AS files 
  ON stats.database_id = files.database_id
  AND stats.file_id = files.file_id
WHERE files.type_desc = 'ROWS'

efvincent

;;; init --- my init file

;;; Commentary:
; Eric F. Vincet
; Current init file, cobbled together mostly from http://howardabrams.com/projects/dot-files/emacs.html

;;; Code:
(setq user-mail-address "eric@efvincent.com")
(setq user-full-name "Eric F. Vincent")