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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gupnp_service_notify

GUPNP_SERVICE_NOTIFY(3) 						 1						   GUPNP_SERVICE_NOTIFY(3)

gupnp_service_notify - Notifies listening clients

SYNOPSIS

       bool gupnp_service_notify (resource  $service, string  $name, int  $type, mixed	$value)

DESCRIPTION

	Notifies listening clients that the property have changed to the specified values.

PARAMETERS

	      o $service
		- A service identifier.

	      o $name
		- The name of the variable.

	      o $type
		- The type of the variable. Type can be one of the following values:

		     o GUPNP_TYPE_BOOLEAN - Type of the variable is boolean.

		     o GUPNP_TYPE_INT - Type of the variable is integer.

		     o GUPNP_TYPE_LONG - Type of the variable is long.

		     o GUPNP_TYPE_DOUBLE - Type of the variable is double.

		     o GUPNP_TYPE_FLOAT - Type of the variable is float.

		     o GUPNP_TYPE_STRING - Type of the variable is string.

	      o $value
		- The value of the variable.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

ERRORS
/EXCEPTIONS
	Issues E_WARNING with either not correctly defined type of the variable or the value is not corresponding to the defined type.

SEE ALSO

       gupnp_service_freeze_notify(3), gupnp_service_thaw_notify(3).

PHP Documentation Group 												   GUPNP_SERVICE_NOTIFY(3)

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gupnp_service_notify