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Tobias Bergkvist bergkvist

  • NixOS Engineer @qredo
  • Oslo, Norway
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bergkvist / asserts.c
Last active September 5, 2022 23:18
Useful assertion macros in C which include debug information like file, line number and error message.
View asserts.c
// These require compiler support for statement expressions (
#define assert_ok(e) ({int x = (e); if (x < 0) { printf("%s:%d: ", __FILE__, __LINE__); fflush(stdout); perror(#e); abort(); } x;})
#define assert_ptr(e) ({void* p = (e); if (p == NULL) { printf("%s:%d: %s: NULL pointer returned\n", __FILE__, __LINE__, #e); abort(); } p;})
bergkvist /
Created September 4, 2022 21:25
Watch a file for changes using inotifywait and kill previous process if still running.
build_and_run() {
cc main.c -o main -Wall -Wextra
trap 'kill "$p" >/dev/null 2>/dev/null' INT
build_and_run &
bergkvist /
Created August 26, 2022 02:20
Check if personal access token is working for private Python package registry using curl
curl -k -s -L -o/dev/null -w"%{http_code}" --url "https://$pip_index_url/$private_package" --header "Authorization: Basic $(printf '%s' "$personal_access_token:" | base64)"
# To configure pip to use registry:
# export PIP_EXTRA_INDEX_URL="https://$personal_access_token@$pip_index_url"
bergkvist /
Last active July 19, 2022 14:10
Allow for writing C extensions inline in IPython
from IPython.core.magic import register_cell_magic
import multiprocessing as mp
from functools import wraps
import importlib.util
import traceback
import sysconfig
import tempfile
import secrets
import sys
import os
bergkvist /
Created August 3, 2021 03:48
Avoid vertical screen tears when you have an Nvidia Graphics card
s="$(nvidia-settings -q CurrentMetaMode -t)"
if [[ "${s}" != "" ]]; then
s="${s#*" :: "}"
nvidia-settings -a CurrentMetaMode="${s//\}/, ForceCompositionPipeline=$MODE, ForceFullCompositionPipeline=$MODE\}}"

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bergkvist / package-tracking.sol
Last active May 1, 2019 08:02
Package Tracking on Ethereum (Solidity)
View package-tracking.sol
pragma solidity ^0.5.0;
contract PackageTracking {
struct Place {
bool exists;
string country;
string location;
struct Package {