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       hesiod,  hesiod_init, hesiod_resolve, hesiod_free_list, hesiod_to_bind,
       hesiod_free_string, hesiod_end - Hesiod name server interface library


       #include <hesiod.h>

       int hesiod_init(void **context)
       char **hesiod_resolve(void *context, const char *name,
            const char *type)
       void hesiod_free_list(void *context, char **list);
       char *hesiod_to_bind(void *context, const char *name,
            const char *type)
       void hesiod_free_string(void *context, char *str);
       char **hesiod_parse_result(void *context,
       unsigned const char *result, int rlen)
       void hesiod_end(void *context)

       cc file.c -lhesiod


       This family of functions  allows  you  to  perform  lookups  of  Hesiod
       information,  which  is  stored  as  text  records  in  the Domain Name
       Service.  To perform lookups, you must first initialize a  context,  an
       opaque  object  which stores information used internally by the library
       between calls.  hesiod_init initializes a context, storing a pointer to
       the  context  in  the  location  pointed  to  by  the context argument.
       hesiod_end frees the resources used by a context.

       hesiod_resolve is the primary interface to the library.  If successful,
       it  returns  a  list of one or more strings giving the records matching
       name and type.  The last element of the list  is  followed  by  a  NULL
       pointer.  It is the caller's responsibility to call hesiod_free_list to
       free the resources used by the returned list.

       hesiod_to_bind converts name  and  type  into  the  DNS  name  used  by
       hesiod_resolve.  It is the caller's responsibility to free the returned
       string using hesiod_free_string.

       hesiod_parse_result parses the result of a name server query into  text
       records.  It is the caller's responsibility to call hesiod_free_list to
       free the resources used by the returned list.


       If successful, hesiod_init returns 0; otherwise it returns -1 and  sets
       errno   to   indicate   the  error.   On  failure,  hesiod_resolve  and
       hesiod_to_bind return  NULL  and  set  the  global  variable  errno  to
       indicate the error.


       If  the  environment  variable  HES_DOMAIN is set, it will override the
       domain in the Hesiod configuration file.  If the  environment  variable
       HESIOD_CONFIG   is  set,  it  specifies  the  location  of  the  Hesiod
       configuration file.


       `Hesiod - Project Athena Technical Plan  --  Name  Service',  named(8),


       Hesiod calls may fail because of:

       ENOMEM Insufficient  memory  was  available  to carry out the requested

              hesiod_init failed because the  Hesiod  configuration  file  was

              hesiod_resolve  failed because no name server could be contacted
              to answer the query.

              hesiod_resolve or hesiod_to_bind failed  because  the  query  or
              response was too big to fit into the packet buffers.

       ENOENT hesiod_resolve  failed  because  the  name  server  had  no text
              records matching name and type, or hesiod_to_bind failed because
              the  name  argument  had  a  domain extension which could not be
              resolved with type ``rhs-extension'' in the local Hesiod domain.

       EINVAL hesiod_to_bind failed to convert the resulting domain name  from
              UTF-8 to an internationalized domain name.


       Steve Dyer, IBM/Project Athena
       Greg Hudson, MIT Team Athena
       Copyright  1987,  1988, 1995, 1996, 2000 by the Massachusetts Institute
       of Technology.


       The strings corresponding  to  the  errno  values  set  by  the  Hesiod
       functions   are   not  particularly  indicative  of  what  went  wrong,
       especially for ENOEXEC and ENOENT.

                               30 November 1996                      HESIOD(3)

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