hesiod(3) - NetBSD Manual Pages

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HESIOD(3)                                               HESIOD(3)



NAME

       hesiod,   hesiod_init,  hesiod_resolve,  hesiod_free_list,
       hesiod_to_bind, 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_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 infor-
       mation used internally by the library between calls.  hes-
       iod_init initializes a context, storing a pointer  to  the
       context  in  the  location pointed to by the context argu-
       ment.  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  ele-
       ment 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 free.


RETURN VALUES

       If successful, hesiod_init returns 0; otherwise it returns
       -1 and sets errno to indicate the error.  On failure, hes-
       iod_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  speci-
       fies the location of the Hesiod configuration file.


SEE ALSO

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



                         30 November 1996                       1





HESIOD(3)                                               HESIOD(3)



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  hes-
              iod_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.


AUTHOR

       Steve Dyer, IBM/Project Athena
       Greg Hudson, MIT Team Athena
       Copyright 1987, 1988,  1995,  1996  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                       2