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The short version:

Always use calloc() instead of malloc()+memset(). In most cases, they will be the same. In some cases, calloc() will do less work because it can skip memset() entirely. In other cases, calloc() can even cheat and not allocate any memory! However, malloc()+memset() will always do the full amount of work.

Understanding this requires a short tour of the memory system.

Quick tour of memory

There are four main parts here: your program, the standard library, the kernel, and the page tables. You already know your program, so...

Memory allocators like malloc() and calloc() are mostly there to take small allocations (anything from 1 byte to 100s of KB) and group them into larger pools of memory. For example, if you allocate 16 bytes, malloc() will first try to get 16 bytes out of one of its pools, and then ask for more memory from the kernel when the pool runs dry. However, since the program you're asking about is allocating for a large amount of memory at once, `mal

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zsh | (anon):12: character not in range

Solution:

sudo apt-get install -y language-pack-en
sudo update-locale

Then zsh starts working!

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version: '3'
services:
  postgres:
    image: postgres
    hostname: postgres
    ports:
      - "5432:5432"
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres

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# This docker-compose file intent to create a multi-container application
# that runs a Jenkins container connected via TLS to a Docker-in-Docker (dind) container as Docker daemon.
#
# Advice about this approach can be found at: 
# http://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/
#
# As well discussion about another alternatives on this setup can be found at:
# https://forums.docker.com/t/using-docker-in-a-dockerized-jenkins-container/322/11
#
# Quick reference about Docker-in-Docker can be fount at:

jadia

REFER TO BELOW video_fix_opera.md FILE FIRST. THIS IS A BACKUP METHOD IF THAT METHOD DOESN'T WORK

If you do not get the file from your system, you can extract the file from the chromium package. Follow below instructions to get the package. Original post. Copied here, just in case owner decides to delete the gist.

Install libffmpeg.so in vivaldi

This short instruction shows how to install libffmpeg.so in vivaldi to play e.g. mp4 videos.

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Add .zip suffix to all files starting with name test

bash -c "ls test* | xargs -I {} mv {} {}.zip"

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GPG sign issue when commiting the message

error: gpg failed to sign the data
fatal: failed to write commit object

sudo apt install -y pinentry-tty && \
sudo update-alternatives --config pinentry

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Grep through all the files in the folder

Search through directory and sub-directories

grep -r stuffToSearch ./*

Search only specific files

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Convert VDI images to IMG or QCOW2 in QEMU

qemu-img convert -f vdi -O qcow2 vm.vdi vm.qcow2

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sudo qemu-img create -f qcow2 ~/VOLUME-NAME.qcow2 30G
                                 ^[name of storage]