Working with Python and Linux System Processes

Overview

• process group
  • has process group leader
    • the process that creates the group and whose PID becomes the PGID of the group.
  • one or more processes sharing the same process group identifier (PGID)
• session
  • collection of process groups
  • has session leader, which is process that started the new session

Links

• https://groups.google.com/forum/#!topic/comp.unix.programmer/beJvmbyKBmM
• http://stackoverflow.com/questions/13593223/making-sure-a-python-script-with-subprocesses-dies-on-sigint
• http://stackoverflow.com/questions/4789837/how-to-terminate-a-python-subprocess-launched-with-shell-true
• http://unix.stackexchange.com/questions/82724/ps-switches-to-display-pid-ppid-pgid-and-sid-collectively
• https://linux.die.net/man/1/pstree
• https://en.wikipedia.org/wiki/Unix_signal#POSIX_signals
• https://nattster.wordpress.com/2013/06/05/catch-kill-signal-in-python/
• https://en.wikipedia.org/wiki/Process_group
• http://stackoverflow.com/questions/21406887/python-subprocess-changing-directory
• http://stackoverflow.com/questions/3503719/emulating-bash-source-in-python
• http://unix.stackexchange.com/questions/48994/how-to-run-a-program-in-a-clean-environment-in-bash
• http://superuser.com/questions/956179/how-does-condas-source-activate-foo-work
• https://docs.python.org/2/library/signal.html
• https://docs.python.org/2/library/subprocess.html#subprocess.Popen.returncode
• https://docs.python.org/2/library/os.html

Command Reference

# Views processes with more details
ps -A -o pid,sid,pgid,comm