Is it a joke or a command? Post: 303034672

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Top Forums UNIX for Beginners Questions & Answers Is it a joke or a command? Post 303034672 by wisecracker on Thursday 2nd of May 2019 05:33:54 AM

05-02-2019

Registered User

Hi fellas...

OO oriented programming lends itself to quick acting fork_bombing and memory eating.
Take this Python code deliberately held back:

Code:

# Works on any Python!
# OO programming eats memory like there's in no tomorrow!
text='Junk variable!'
for x in range(0,5,1):
    text=text+text
    print(text)
    print(id(text))

# A very basic fork bomb for Python, the print function holds it back:
# def _(): _()

def _(): print('_()'); print(id(_))
_()

Results OSX 10.14.3, default bash terminal calling Python 3.5.2.

Code:

Last login: Thu May  2 10:13:33 on ttys000
AMIGA:amiga~> cd Desktop/Code/Python
AMIGA:amiga~/Desktop/Code/Python> python3.5 OO_bomb.py
Junk variable! Junk variable! 
4328391264
Junk variable! Junk variable! Junk variable! Junk variable! 
4328477280
Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! 
4327568992
Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! 
4338181032
Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! Junk variable! 
4337054352
_()
4338198864
AMIGA:amiga~/Desktop/Code/Python> _

As one can see the fork bomb although not obfuscated is a single line of code and very dangerous.
Object Orientation OTOH is memory hungry and anyone with any knowledge can do that from Python interactive shell.
With only 2MB of memory on a stock AMIGA A1200 and Python this stood out only too well as soon my 2MB was gone.

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ansi_ctrlu

term::ansi::ctrl::unix(3tcl)					 Terminal control				      term::ansi::ctrl::unix(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       term::ansi::ctrl::unix - Control operations and queries

SYNOPSIS

       package require Tcl  8.4

       package require term::ansi::ctrl::unix  ?0.1.1?

       ::term::ansi::ctrl::unix::import ?ns? ?arg...?

       ::term::ansi::ctrl::unix::raw

       ::term::ansi::ctrl::unix::raw

       ::term::ansi::ctrl::unix::columns

       ::term::ansi::ctrl::unix::rows

_________________________________________________________________

DESCRIPTION

       WARNING:  This  package	is  unix-specific  and depends on the availability of two unix system commands for terminal control, i.e. stty and
       tput, both of which have to be found in the $PATH. If any of these two commands is missing the loading of the package will fail.

       The package provides commands to switch the standard input of the current process between raw and cooked input modes, and to query the size
       of terminals, i.e. the available number of columns and lines.

API

   INTROSPECTION
       ::term::ansi::ctrl::unix::import ?ns? ?arg...?
	      This  command imports some or all attribute commands into the namespace ns. This is by default the namespace ctrl. Note that this is
	      relative namespace name, placing the imported command into a child of the current namespace. By default all commands  are  imported,
	      this can howver be restricted by listing the names of the wanted commands after the namespace argument.

   OPERATIONS
       ::term::ansi::ctrl::unix::raw
	      This command switches the standard input of the current process to raw input mode. This means that from then on all characters typed
	      by the user are immediately reported to the application instead of waiting in the OS buffer until the Enter/Return key is received.

       ::term::ansi::ctrl::unix::raw
	      This command switches the standard input of the current process to cooked input mode. This means that from then  on  all	characters
	      typed by the user are kept in OS buffers for editing until the Enter/Return key is received.

       ::term::ansi::ctrl::unix::columns
	      This command queries the terminal connected to the standard input for the number of columns available for display.

       ::term::ansi::ctrl::unix::rows
	      This command queries the terminal connected to the standard input for the number of rows (aka lines) available for display.

BUGS, IDEAS, FEEDBACK
       This  document, and the package it describes, will undoubtedly contain bugs and other problems.	Please report such in the category term of
       the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you  may  have  for
       either package and/or documentation.

KEYWORDS

       ansi, columns, control, cooked, input mode, lines, raw, rows, terminal

CATEGORY

       Terminal control

COPYRIGHT

       Copyright (c) 2006-2011 Andreas Kupries <andreas_kupries@users.sourceforge.net>

term								       0.1.1					      term::ansi::ctrl::unix(3tcl)

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