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HESIOD(3)             DragonFly Library Functions Manual             HESIOD(3)

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

SYNOPSIS
       #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

DESCRIPTION
       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.

RETURN VALUES
       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.

ENVIRONMENT
       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.

SEE ALSO
       `Hesiod - Project Athena Technical Plan -- Name Service', named(8),
       hesiod.conf(5)

ERRORS
       Hesiod calls may fail because of:

       ENOMEM Insufficient memory was available to carry out the requested
              operation.

       ENOEXEC
              hesiod_init failed because the Hesiod configuration file was
              invalid.

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

       EMSGSIZE
              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.

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

BUGS
       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)