dn_find man page on DigitalUNIX

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dn_find(3)							    dn_find(3)

       dn_find - Search for an expanded domain name

       #include	    <sys/types.h>     #include	   <netinet/in.h>     #include
       <arpa/nameser.h> #include <resolv.h>

       int dn_find(
	       char *exp_domain_name,
	       char *message,
	       char **domain_names,
	       char **end_ptr );

       Standard C Library (libc)

       Points to an expanded domain name.  Points to the address of  a	domain
       name  message  that contains the name sought by the dn_find() function.
       Specifies an array of pointers to previously compressed	names  in  the
       current message.	 Points to the end of an array of pointers.  The array
       is indicated by the domain_names parameter.

       The dn_find() (domain name find)	 function  searches  for  an  expanded
       domain  name from a list of previously compressed names. An application
       program calls the dn_find() function  indirectly	 using	the  dn_comp()
       function.  If  an expanded domain name is found, the dn_comp() function
       returns the offset from the message parameter.

       The dn_find() function is one of a set of  subroutines  that  form  the
       resolver, a set of functions that resolves domain names.	 Global infor‐
       mation used by the resolver functions resides in the _res  data	struc‐
       ture.  The include/resolv.h file contains the _res data structure defi‐

       Upon successful completion, the dn_find() function returns  the	offset
       from the message parameter. Otherwise, the dn_find() function returns a
       value of -1.

       Defines name server and domain name structures and constants.

       Functions:  res_init(3),	  res_mkquery(3),   res_send(3),   dn_comp(3),
       dn_expand(3),   _getshort(3),   _getlong(3),  putshort(3),  putlong(3),

       Commands: named(8)


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