219 results for "":
Doing geo-location and keeping analytics
I sold you on some additional functionality for catscii last chapter, and we
got caught up in private registry / docker shenanigans, so, now, let’s resume
web development as promised.
Adding geolocation
We kinda left the locat crate stubby, it doesn’t actually do any IP to
location lookups. It doesn’t even have a dependency on a crate that can do
that.
Dynamic linker speed and correctness
In the last article, we managed to load a program (hello-dl) that uses a single
dynamic library (libmsg.so) containing a single exported symbol, msg.
Our program, hello-dl.asm, looked like this:
global _start
extern msg
section .text
_start:
mov rdi, 1 ; stdout fd
mov rsi, msg
mov rdx, 38 ; 37 chars + newline
mov rax, 1 ; write syscall
syscall
xor rdi, rdi ; return code 0
mov rax, 60 ; exit syscall
syscall
An ooc quine
While preparing my next post about ooc documentation yet again, I stumbled upon an old ooc quine of mine. Here it is in integrality for your pleasure:
q := 34 as Char
l := [
"q := 34 as Char"
"l := ["
"]"
"for (i in 0..2) {"
" l[i] println()"
"}"
"for (i in 0..12) {"
" q print(); l[i] print(); q println()"
"}"
"for (i in 2..12) {"
" l[i] println()"
"}"
]
for (i in 0..2) {
l[i] println()
}
for (i in 0..12) {
q print(); l[i] print(); q println()
}
for (i in 2..12) {
l[i] println()
}
Ludum Dare #25 Post-mortem
Last week-end, I participated to Ludum Dare for the fourth time in a row!
Downloads: Linux (64) | OS/X | Windows
Story
So here is our entry: Legithief. The backstory is simple, yet cunning: you are an ordinary thief practicing ordinary acts of thievery in the houses of ordinary people to make a living. But one day.. you are quietly robbing yet another home, when you are suddenly smashed in the head with a bat.
The case for sans-io
The most popular option to decompress ZIP files from the Rust programming language is a crate simply named zip — At the time of this writing, it has 48 million downloads. It’s fully-featured, supporting various compression methods, encryption, and even supports writing zip files.
However, that’s not the crate everyone uses to read ZIP files. Some applications benefit from using asynchronous I/O, especially if they decompress archives that they download from the network.
Happy stay with us day
I didn’t really know what to do for “World Suicide Prevention Day 2014”.
First off, I didn’t know it existed at all. Like, c’mon, know your audience, if you have a party like that, I want in!
Second, it’s a terrible name: I hereby propose “stay with us day” in place. Nevermind the “world” part because, hey, we’re on the internet, the “suicide” part because, well, avoiding that is just the very start of a long uphill battle, and let’s keep the “day” part because, honest, if we can attract people’s attention for even a single day per year, it’ll be nothing short of a miracle.
Making a dev shell with nix flakes
In the previous chapter, we’ve made a nix “dev shell” that contained the fly.io command-line utility, “flyctl”.
That said, that’s not how I want us to define a dev shell.
Our current solution has issues. I don’t like that it has import <nixpkgs>.
Which version of nixpkgs is that? The one you’re on? Who knows what that is.
Also, we haven’t really seen a mechanism to use .nix files from elsewhere.
Running an executable without exec
In part 1, we’ve looked at three executables:
sample, an assembly program that prints “hi there” using thewritesystem call.entry_point, a C program that prints the address ofmainusingprintf- The
/bin/trueexecutable, probably also a C program (because it’s part of GNU coreutils), and which just exits with code 0.
We noticed that when running entry_point through GDB, it always printed the
same address. But when we ran it directly, it printed a different address on
every run.