[LUGOS-PROG] Bash si sladak

[Ales Kosir]

To, da zadeva deluje pravilneje, ce je vmes sleep, je povezano s tem, da se
na debianu uporablja vgrajeni generator nakljucnih stevil, ki potrebuje
'dovolj entropije' v sistemu, da vrne novo nakljucno stevilo, sicer pa vrne
kar starega. Odgovor je skrit v man 4 random. Poglejte, kako deluje
/dev/random in urandom:

DESCRIPTION
       The  character  special files /dev/random and /dev/urandom
       (present since Linux 1.3.30) provide an interface  to  the
       kernel's  random  number  generator.  File /dev/random has
       major device number 1 and minor  device  number  8.   File
       /dev/urandom  has  major  device number 1 and minor device
       number 9.

       The random number generator  gathers  environmental  noise
       from  device  drivers  and  other  sources into an entropy
       pool.  The generator also keeps an estimate of the  number
       of  bit  of  the  noise  in  the  entropy pool.  From this
       entropy pool random numbers are created.

       When read, the /dev/random device will only return  random
       bytes  within the estimated number of bits of noise in the
       entropy pool.  /dev/random should  be  suitable  for  uses
       that  need  very  high quality randomness...

Problem je, kar se mene tice, analiziran in zakljucen. 

Lep pozdrav,
Ales 

-----Original Message-----
From: Miha Tomšič [mailto:miha.tomsic at guest.arnes.si]
Sent: Wednesday, March 20, 2002 12:30 PM
To: lugos-prog at lugos.si
Subject: RE: [LUGOS-PROG] Bash si sladak


	Hojla!

On Tue, 19 Mar 2002, Ales Kosir wrote:
> Tisti, ki vam random ne vraca nakljucnih stevil, poskusite se tole: 
>   for ((i=1; i<5 ; i++)); do echo $RANDOM; sleep 1; done  | cat

Ja, zadeva deluje pravilneje. Ampak to še ne pojasni nastale napake, poleg
tega pa je izvajanje "dolgočasno".

	Miha...

 - Miha Tomšič --- C. na postajo 55 -- SI-1351 Brezovica pri Lj. ---
SLOVENIA -