robertoaloi

-module(this_is_fun).

-export([have_fun/0]).
-export([loop/0]).

have_fun() ->
    table = ets:new(table, [named_table]),
    F = fun(X) -> X + 1 end,
    ets:insert(table, {function, F}),
    register(funny, spawn(?MODULE, loop, [])).

robertoaloi

#!/bin/sh

tail -n +2 $1 > $1.tmp
unzip -d $1.unescriptized $1.tmp
rm $1.tmp

robertoaloi

Start an instance of the Erlang run-time system

$ erl

Show information about processes

> i().

Spawn a new process which sleeps for 10 seconds

robertoaloi

#!/bin/sh

# Kill an Erlang process by node name
#
# e.g.: ekill my_node

# Check usage
if [ -z "$1" ]; then
  echo "Usage: `basename $0` NODE_NAME"
  exit 1

robertoaloi

Misleading error message on ssh_sftp:start_channel/1 in case user does not have a shell

When starting a SFTP channel towards a system where user does not have a shell (i.e. it has /bin/false or equilvalent assigned in the /etc/passwd a misleading error message is returned to the user:

1> test:go(). 
** exception exit: {normal,{gen_server,call,
                                       [<0.53.0>,
                                        {{timeout,infinity},
 wait_for_version_negotiation},

robertoaloi

#!/usr/bin/env bash

# Kill an Erlang process by node name
#
# e.g.: kill-erlang-node kred

# Check usage
if [ -z "$1" ]; then
  echo "Usage: `basename $0` NODE_NAME"
  exit 1

robertoaloi

README

Example of OTP deadlock via the application controller.

In OTP, the application environment is handled via a ETS table, which is accessed via the application_controller process. Whilst reading an environment variable is implemented as a mere lookup operation, writes are serialized through the application controller. In other words, it is not possible to set an environment variable from a terminate/1 callback in a gen_server which traps exits,

robertoaloi

FROM centos:centos6
RUN yum update -y && yum install -y https://www.rabbitmq.com/releases/erlang/erlang-17.4-1.el6.x86_64.rpm

robertoaloi

-module(atom_table).

-export([count/0]).

count() ->
  Info      = erlang:system_info(info),
  Chunks    = binary:split(Info, <<"=">>, [global]),
  [TabInfo] = [X || <<"index_table:atom_tab", X/binary>> <- Chunks],
  Lines     = binary:split(TabInfo, <<"\n">>, [global]),
  Chunks2   = [binary:split(L, <<": ">>) || L <- Lines, L =/= <<>>],

robertoaloi

#{deps =>
      [#{name => <<"getopt">>,
         src_dirs => ["src"],
         out_mappings =>
             [#{path =>
                    "/Users/robertoaloi/git/github/erlang-ls/erlang_ls/_build/default/lib/getopt/ebin",
                extension => ".beam"}],
         include_dirs =>
             ["/Users/robertoaloi/git/github/erlang-ls/erlang_ls/_build/default/lib/getopt/include",
              "/Users/robertoaloi/git/github/erlang-ls/erlang_ls/_build/default/lib/getopt/src",