Is UNIX an open source OS ? Post: 302911911

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Operating Systems Linux Fedora Is UNIX an open source OS ? Post 302911911 by bakunin on Monday 4th of August 2014 12:23:45 PM

08-04-2014

Registered User

Quote:

Originally Posted by sreyan32

Could you elaborate on this point further. I mean if no one conformed to a standard how on earth is that standard still surviving. And also why is it there ??

For the same reason why there is a OSI-reference protocol stack which is (almost) nowhere implemented. It is an ideal against which each "real existing implementation" is measured. Even if no implementation fully conforms to it every one is - at least in theory - striving to do so and asymptotically converging towards it.

Take the OSI-reference model for networks as an example: to my knowledge the whole seven layers of it where only once being implemented (in some obscure DEC network stack working under VMS), but every network protocol is compared against it and we say that "IP is a layer-3 protocol", even though TCP/IP was not built with the OSI reference model in mind and in fact - from a theoretical POV - really covers only the layers 3, 4 and 5.

I hope this helps.

bakunin

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LEARN ABOUT OPENSOLARIS

net_protocol_lookup

net_protocol_lookup(9F) 				   Kernel Functions for Drivers 				   net_protocol_lookup(9F)

NAME

       net_protocol_lookup - locate an implementation of a network layer protocol

SYNOPSIS

       #include <sys/neti.h>

       net_data_t net_protocol_lookup(netid_t id, const char *protocol);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       id	 network instance identifier.

       family	 name of the network protocol to find.

DESCRIPTION

       The  net_protocol_lookup()  function attempts to locate a data structure that defines what capabilities it is exporting through this inter-
       face. The value returned by this call is guaranteed to be valid until it is passed into a call to net_protocol_release(9F), after which	it
       should no longer be treated as valid.

       The  protocol must be a registered name of a network protocol that has been registered. The symbols NHF_INET and NHF_INET6 should be passed
       to net_protocol_lookup() as the protocol name to gain access to either IPv4 or IPv6 respectively.

RETURN VALUES

       The net_protocol_lookup() function returns NULL if it does not find any knowledge about the  network  protocol  referenced.  Otherwise,	it
       returns a value that can be used with other calls in this framework.

CONTEXT

       The net_protocol_lookup() function may be called from user,  kernel, or interrupt context.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       net_protocol_release(9F), attributes(5)

SunOS 5.11							    1 May 2008						   net_protocol_lookup(9F)