#!/bin/bash
# Created by Sam Gleske
# Created Sat Jan  1 16:56:54 EST 2022
# MIT License - https://github.com/samrocketman/home

# DESCRIPTION
#     Find all running processes which have loaded Feral Interactive gamemode
#     via libgamemodeauto.so.  This script will not detect processes which load
#     gamemode without libgamemodeauto.so.

# DEVELOPMENT ENVIRONMENT
#     Ubuntu 18.04.6 LTS
#     Linux 5.4.0-91-generic x86_64
#     GNU bash, version 4.4.20(1)-release (x86_64-pc-linux-gnu)
#     find (GNU findutils) 4.7.0-git
#     GNU Awk 4.1.4, API: 1.1 (GNU MPFR 4.0.1, GNU MP 6.1.2)
#     xargs (GNU findutils) 4.7.0-git
#     ps from procps-ng 3.3.12

if [ -z "${USER:-}" ]; then
  echo '$USER variable not defined.' >&2
  exit 1
fi

if [ ! -d /proc ]; then
  echo 'ERROR: /proc filesystem missing.  We do not appear to be running on Linux.' >&2
  exit 1
fi

find /proc -maxdepth 2 -type f -user "${USER}" -readable -name maps -exec \
  awk -- 'BEGINFILE { if (ERRNO) nextfile } $0 ~ /libgamemodeauto\.so\.0/ {pid=FILENAME; gsub("[^0-9]", "", pid); print pid;nextfile}' {} + \
  | xargs | xargs -I{} -- ps -o pid,ppid,user,ni,psr,comm --pid '{}'