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Full Discussion: Deep copy of structure in C
Top Forums Programming Deep copy of structure in C Post 302906351 by cnamejj on Thursday 19th of June 2014 05:32:17 AM
Old 06-19-2014
There's a couple things that make it hard to just give you a suggested solution...

First, the structure you're talking about it generally not just one structure. It's a linked list of structures, each one describing one address info "chunk" of information. So do you just want to copy one link in the chain, or the whole thing?

Second, a "struct sockaddr" might seem like a simple, friendly little thing. But it's not. It's really a placeholder structure for another structure, usually either a "struct sockaddr_in" or a "struct sockaddr_in6". So copying it requires you to do more work than you would have to do for a static structure with a consistent format.

And third, which is really minor compared to the other two, is that even if you just one this one particular chain in the link, some of the fields are pointers. So the logic just has to allocate separate chunks of memory for the various pieces.

Maybe if you explain a bit more about what you're trying to do it would help? Obviously this has something to do with some sort of host/service lookup and scanning through the results. But that doesn't narrow things down very much.
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LEARN ABOUT SUSE

chain

CHAIN(3)						 MBK UTILITY STRUCTURE DEFINITIONS						  CHAIN(3)

NAME

       chain - mbk lisp-like service structure

DESCRIPTION

       The chain is used for any purpose, when a list of pointer is required.  The use of this structure is strongly recommanded, when such a need
       occurs.

       The declarations needed to work on chain are available in the header file "/labo/include/mut315.h", where '315' is the actual mbk version.

       The following C structure supports the description of the chain :
	      typedef struct chain {
		 struct chain	  *NEXT;
		 void		  *DATA;
	      } chain_list;

       NEXT		   Pointer to the next chain of the list.

       DATA		   Generic pointer used to point to any kind of object. Do not forget to cast the pointer back to its previous	type  when
			   using this field.

       Remark : 	   a  specialized memory allocator has been built in order to create and free chain_lists, so absolutly avoid to create or
			   free them an other way than through the access functions.

SEE ALSO

       mbk(1), addchain(3), freechain(3), delchain(3).

BUG REPORT

       This tool is under development at the ASIM department of the LIP6 laboratory.
       We need your feedback to improve documentation and tools.

ASIM
/LIP6							  October 1, 1997							  CHAIN(3)
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