Jim Fisher

Developer of Vidrio, the future of presentation. Other topics include C, UNIX, and networking. Also find me on GitHub, Stack Overflow, LinkedIn, Twitter, Instagram, Keybase. Find my old blogs: Wordpress, Medium.

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Blog. Public speaking. Friends. Vidrio.
ICFP: Ode on a Random Urn (Sep 18)
What is the web Push API? (Sep 19)
Web Notification API onclick (Sep 20)
How can I encrypt data in the Web Push API? (Sep 21)
Adding an RSS feed to a Jekyll blog (Sep 22)
How can I store things on the browser? (Sep 23)
LocalStorage hello world (Sep 24)
Service worker hello world (Sep 11)
new Notification(...) is deprecated (Sep 12)
What is the web Background Sync API? (Sep 13)
What is a Web App Manifest? (Sep 14)
Why are there 21 million bitcoins? (Sep 15)
Coping with depression (Sep 16)
Hello world in Rust (Sep 17)
How to write an essay (Sep 4)
Worst interview (Sep 5)
Array vs. dictionary pagination (Sep 6)
What is the web Notification API? (Sep 7)
Publication notifications for static sites (Sep 8)
How could Bitcoin fail? (Sep 9)
What are service workers? (Sep 10)
What is an extern function in C? (Aug 28)
Securing my Bitcoin (Aug 29) A calendar view for this blog (Aug 29)
How do I make a full-width iframe with fixed aspect ratio? (Aug 30)
Post-driven permanent blog pages (Aug 31)
August review (Sep 1)
What makes a good blog post title? 5 steps to going VIRAL! (Sep 2)
Running a Laravel+Pusher workshop at work (Sep 3)
What is C include? (Aug 21)
How to inspect Mach-O files (Aug 22)
Sentence wrap (Aug 23)
How to make plugins with dlopen (Aug 24)
What system calls does dlopen use? (Aug 25)
What is static linking in C? (Aug 26)
What is extern in C? (Aug 27)
Promoting Vidrio (Aug 14)
Greater-than is redundant (Aug 15)
How do Reddit thumbnails work? (Aug 16)
What are Open Graph meta tags? (Aug 17) Marketing works! (Aug 17) Golang’s realtime garbage collector at GolangUK (Aug 17)
What is stdatomic in C? (Aug 18)
Does C have generics? (Aug 19)
What is an authoritative DNS server? What is a recursive DNS server? (Aug 20)
This site is now on jameshfisher.com (Aug 7)
How to move your GitHub pages blog to Netlify (Aug 8)
What is the rel=canonical tag? (Aug 9)
How to trace a DNS lookup (Aug 10)
How do peer-to-peer programs discover each other? (Aug 11)
How to build a .dmg to distribute MacOS apps (Aug 12)
How to distribute a MacOS .dmg (Aug 13)
How to watch system calls with dtruss (Aug 1)
How to implement malloc/free (Aug 2)
How can I do DNS lookup in Go? (Aug 3)
How to write a DNS server in Go (Aug 4)
How to let your users sign in with Google, from scratch (Aug 5)
Instance DNS in multi-tenant services (Aug 6)
Notes from Minsk (Jul 25)
Are concurrent fwrites atomic? No! (Jul 29)
How to cut out the CA middleman (Jul 30)
Golang’s realtime garbage collector at GoWayFest, Minsk (Jul 21)
The Fisher Tree at The Realtime Guild (Jul 5)
Pattern jokes via WordNet/NLTK (Jun 25)
Long calendar (Jun 6)
Defining the sine function as an oscillator (Jun 4)
Granddad died today (May 19)
How to make a Core Image kernel program running on the CLI (May 2)
What is CIColorKernel? (May 3)
What is the clear program? (May 6)
Don’t trust cat! (May 7)
How to apply a CIFilter to an image in Swift (Apr 26)
How to make a custom CIFilter in Swift (Apr 27)
What are samples in a Core Image kernel? (Apr 28)
How to write a webcam app in Swift on macOS (Apr 29)
How to pass multiple inputs to a CIKernel (Apr 30)
What company information is public? What’s on Companies House? (Apr 17)
How to write a TCP chat server in 55 lines of Golang (Apr 18)
How to write an OpenCL ‘hello world’ on macOS (Apr 19)
How to run Swift from the CLI (Apr 20)
What is a .app? (Apr 21)
What is the simplest neural network? One neuron (Apr 22)
How to write ‘hello world’ in TensorFlow (Apr 23)
Playing with Stripe (Apr 10)
Vidrio payment server (Apr 11)
Vidrio payment server: creating charges (Apr 12)
Vidrio gets real product keys (Apr 13)
How can I do elliptic curve crypto with OpenSSL? (Apr 14)
How to create a public-key infrastructure (Apr 15)
What is a business? What is a company? (Apr 16)
How to run go tool trace (Apr 3)
What is the viewport meta tag? How can I display my website on mobile? (Apr 4)
How do I set a socket to be non-blocking? (Apr 5)
What is go tool trace? (Apr 6) rxi/vec - a simple C vector library (Apr 6)
Multiplexing by looping over nonblocking sockets (Apr 7)
How to implement a ‘free trial’ for macOS apps (Apr 8)
Product key server as a service (Apr 9)
How to use keycastr (Mar 27)
Varying navbar for mobile and desktop (Mar 28)
How to prevent autoplay on mobile (Mar 29)
Replay with sound (Mar 30)
Vidrio promo video: first cut (Mar 31)
Monthly review: 2017-03 (Apr 1)
What is ‘sequencing markets’? (Apr 2)
How is MainMenu.xib found in Cocoa? (Mar 20)
How do I do public-key encryption with openssl? (Mar 21)
How do I do public-key signatures with openssl? (Mar 22)
How to get your point across with spaced repetition (Mar 23)
Your password is the private key. So what is the public key? (Mar 24)
Study of framer.com promo video (Mar 25)
Vidrio promo music (Mar 26)
How do I create a message digest using openssl? (Mar 13)
Don’t say ‘it will take five minutes’ (Mar 14)
Vidrio marketing strategy (Mar 15)
Vidrio 1.2 is released (Mar 16)
How to make a Cocoa application without a .xib file (Mar 17)
What is Swift’s @NSApplicationMain annotation? (Mar 18)
What is NSApplication? How is it instantiated? What is NSApp? (Mar 19)
Vidrio needs the touch bar (Mar 6)
Vidrio is on Slack (Mar 7)
Vidrio is Tony Stark’s presentation tool (Mar 8)
How do I encrypt text with openssl? (Mar 9)
How do I generate random bytes with openssl? (Mar 10) Golang’s realtime garbage collector at Not On The High Street Conference (Mar 10)
How do I fetch a server’s SSL certificate using openssl? (Mar 11)
How do I hash a password with openssl? (Mar 12)
What are the domain and type arguments to the socket system call? (Feb 27)
How to write a TCP server with the pthread API (Feb 28)
How do I create the AppIcon for my app? (Mar 1) Vidrio website (Mar 1) Vidrio privacy policy (Mar 1) Vidrio gets a menu bar (Mar 1) Vidrio App Record (Mar 1) Justifying posts (Mar 1) Monthly review: 2017-02 (Mar 1) Installing and running ebe (Mar 1) What is the Apple Store release process? (Mar 1)
Vidrio turns the webcam off when not showing it (Mar 2) Vidrio should have a pause/unpause feature (Mar 2) Vidrio opacity slider (Mar 2) Vidrio is available! (Mar 2) Vidrio app description (Mar 2) How to submit an app build to iTunes Connect (Mar 2)
How to add a developer account to XCode (Mar 3)
Vidrio installs per day (Mar 4) Vidrio bug: pause toggle text wrong after unpausing by setting to default opacity (Mar 4) Vidrio: better screenshots on the App Store (Mar 4)
Vidrio for Windows (Mar 5) Vidrio 1.1 is released (Mar 5)
How to write an assembly ‘hello world’ on macOS (Feb 20) What is lsof? (Feb 20)
What is a a FIFO, or “named pipe”? What is mkfifo in C? (Feb 21)
What is ssize_t in C? (Feb 22) Don’t use the word ‘simply’ (Feb 22)
How do I print bits in C? (Feb 23)
What is mode_t in C? (Feb 24)
How to write a TCP server using the fork syscall (Feb 25) Should I go paperless? (Feb 25)
What is UTF-8? (Feb 26)
French preposition examples (Feb 13)
UNIX as a SQL database (Feb 14)
Golang’s realtime garbage collector, at The Realtime Guild (Feb 15) How do I duplicate a file descriptor in C? (Feb 15)
How do I close a file descriptor in C? (Feb 16)
How do I call a program in C, setting up standard pipes? (Feb 17)
What are setjmp and longjmp in C? (Feb 18)
How to generate Intel and AT&T assembly with clang (Feb 19)
How do I use fork in C? (Feb 6)
How do I call a program from C? (Feb 7)
How can I wake up earlier? (Feb 8) How does GeoDNS work? (Feb 8)
How to wake up earlier (Feb 9)
What is the happened-before relation? (Feb 10)
Are processes and messages different? (Feb 11)
What are Lamport timestamps? (Feb 12)
How do I read man pages? (Jan 30) Cloning Spaceteam (Jan 30)
What system calls does macOS have? (Jan 31)
Monthly review: 2017-01 (Feb 1)
How do I access environment variables in C? (Feb 2)
How do I generate assembly from a C file? (Feb 3)
FOSDEM: The Challenges and Secrets of the Realtime World (Feb 4) WebRTC - low barrier to entry, low barrier to exit? (Feb 4) What are the stages of C compilation? (Feb 4)
How do I use execve in C? (Feb 5)
What is the type of a constant in C? (Jan 23)
Quickly checking for a zero byte in C using bitwise operations (Jan 24) How to subtract in binary (Jan 24)
What is Coulomb’s law? (Jan 25)
What is mmap in C? (Jan 26)
How can I read a file with mmap in C? (Jan 27)
How can I write a file with mmap in C? (Jan 28)
In what ways can processes communicate? (Jan 29)
How to write a ‘hello world’ serverless WebRTC app (Jan 16)
How does reliability work in RTCDataChannel? (Jan 17)
What is electric charge? (Jan 18)
What is electric current? (Jan 19)
What is the UINT64_C macro in C? (Jan 20)
What are lvalue and rvalue in C? (Jan 21)
What is the difference between C constants and C literals? (Jan 22)
What are ‘signals’ in C? (Jan 9)
What does the C signal function return? (Jan 10)
How do I unregister a signal handler in C? (Jan 11)
Doing something n times in C with while and decrement (Jan 12)
What is sigaction in C? (Jan 13)
How do C signals interact with the stack? (Jan 14)
What is STUN? (Jan 15)
How do I pack bits in C? (An answer using masks) (Jan 2)
What is a union in C? (Jan 3)
What are ‘bitfields’ in C? (Jan 4)
Error URLs (addressable errors) (Jan 5)
What is the Ivy Lee method? (Jan 6)
How does the USB power wire work? (Jan 7)
How does differential signaling work in USB? (Jan 8)
How fast does an IP packet travel? (Jan 1)
How do I measure program execution time in C? How do I use the times function? (Dec 26)
How do I put an array in a struct in C? (Dec 27)
Pointer to middle of allocation, part 1 (Dec 28)
What are ‘statement expressions’ in GCC? (Dec 30)
What do DNS datagrams look like? (Dec 31)
What syscalls does a UDP server need? (Dec 19)
How to write a ‘hello world’ HTTP server in C (Dec 20)
What is htons in C? (Dec 21)
How do I print bytes in C? (Dec 22)
What are ‘protocol numbers’ in IP? (Dec 23)
What is perror in C? (Dec 24)
How to write an array literal in C (with explicit indexes) (Dec 25)
What are static functions in C? (Dec 12)
What is errno in C? (Dec 13)
What syscalls does a TCP server need? (Dec 14)
What is a “file descriptor”, really? (Dec 15)
How to write a TCP server with the select syscall (Dec 16)
What is fdset in C? (Dec 17)
How to write a TCP server with the kqueue API (Dec 18)
How do I set the C compiler in a Makefile? (Dec 5)
What is a ‘binary-safe’ string? (Dec 6)
What are automatic variables (dollar variables) in a Makefile? (Dec 7)
What is ‘array decaying’ in C? (Dec 8)
What are ‘macro functions’ in C? (Dec 9)
How can I do modulo with a bitmask in C? (Dec 10)
What is static in C? (Nov 28)
How do I find out which preprocessor my C compiler uses? (Nov 29) What is size_t for? How do I iterate over an object in C? (Nov 29) What type should I use to count objects in C? (Nov 29)
Where is the C programming language defined? (Nov 30) Does C allow pointer arithmetic? (Nov 30) How do I write a multi-line string literal in C? (Nov 30) Can I put comments in string literals in C? (Nov 30) What do array subscripts mean in C? (Nov 30)
Does C have booleans? (Dec 1) What is realloc in C? (Dec 1)
What does const mean in C? (Dec 2)
What does the restrict keyword mean in C? (Dec 3)
What is FILE in C? (Dec 4)
How does a stream cipher work? (Nov 21)
Some screenshots of Vidrio (Nov 22)
How do varargs work in C? (Nov 23)
A C typedef convention for complex types (Nov 24) How is the stack laid out in C? (Nov 24)
Don’t use the word ‘it’ (Nov 25)
What is void in C? (Nov 27) What does void mean as a function parameter in C? (Nov 27) What is K&R style function definition in C? (Nov 27) What are ‘calling conventions’ in C? (Nov 27) Bike front derailleur (Nov 27)
128 byte of CSS is enough (Nov 15)
Learning vim (a short adventure) (Nov 16) How do I serialize JSON in Swift? (Nov 16) Post every day (Nov 16) A summary of ‘On-the-Fly Garbage Collection: An Exercise in Cooperation’ (Nov 16) Should I get a cleaner? (Nov 16)
What is an .xcworkspace file? (Nov 17) What is an .xcodeproj file? (Nov 17) How do I write a UDP server in Go? (Nov 17) How do I replace target/action with callbacks in Swift? (Nov 17) Summary of ‘Zero to One’, Chapter 1: the challenge of the future (Nov 17)
How do I change the resolution on macOS? (Nov 18)
What is symmetric cryptography? (Nov 19)
Should I buy Huel or Joylent? (Nov 20)
How does tricolor garbage collection work? (Nov 11)