


HESIOD(3)                                               HESIOD(3)


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

SSYYNNOOPPSSIISS
       ##iinncclluuddee <<hheessiioodd..hh>>

       iinntt hheessiioodd__iinniitt((vvooiidd ****_c_o_n_t_e_x_t))
       cchhaarr ****hheessiioodd__rreessoollvvee((vvooiidd **_c_o_n_t_e_x_t,, ccoonnsstt cchhaarr **_n_a_m_e,,
            ccoonnsstt cchhaarr **_t_y_p_e))
       vvooiidd hheessiioodd__ffrreeee__lliisstt((vvooiidd **_c_o_n_t_e_x_t,, cchhaarr ****_l_i_s_t));;
       cchhaarr **hheessiioodd__ttoo__bbiinndd((vvooiidd **_c_o_n_t_e_x_t,, ccoonnsstt cchhaarr **_n_a_m_e,,
            ccoonnsstt cchhaarr **_t_y_p_e))
       vvooiidd hheessiioodd__eenndd((vvooiidd **_c_o_n_t_e_x_t))

DDEESSCCRRIIPPTTIIOONN
       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 _c_o_n_t_e_x_t, an opaque object which stores infor-
       mation used internally by the library between calls.  _h_e_s_-
       _i_o_d___i_n_i_t initializes a context, storing a pointer  to  the
       context  in  the  location pointed to by the _c_o_n_t_e_x_t argu-
       ment.  _h_e_s_i_o_d___e_n_d frees the resources used by a context.

       _h_e_s_i_o_d___r_e_s_o_l_v_e is the primary interface  to  the  library.
       If  successful,  it  returns a list of one or more strings
       giving the records matching _n_a_m_e and _t_y_p_e.  The last  ele-
       ment of the list is followed by a NULL pointer.  It is the
       caller's responsibility to call _h_e_s_i_o_d___f_r_e_e___l_i_s_t  to  free
       the resources used by the returned list.

       _h_e_s_i_o_d___t_o___b_i_n_d  converts  _n_a_m_e  and _t_y_p_e into the DNS name
       used by _h_e_s_i_o_d___r_e_s_o_l_v_e.  It is the caller's responsibility
       to free the returned string using _f_r_e_e.

RREETTUURRNN VVAALLUUEESS
       If successful, _h_e_s_i_o_d___i_n_i_t returns 0; otherwise it returns
       -1 and sets _e_r_r_n_o to indicate the error.  On failure, _h_e_s_-
       _i_o_d___r_e_s_o_l_v_e  and  _h_e_s_i_o_d___t_o___b_i_n_d  return  NULL and set the
       global variable _e_r_r_n_o to indicate the error.

EENNVVIIRROONNMMEENNTT
       If the environment variable HHEESS__DDOOMMAAIINN  is  set,  it  will
       override  the domain in the Hesiod configuration file.  If
       the environment variable HHEESSIIOODD__CCOONNFFIIGG is set,  it  speci-
       fies the location of the Hesiod configuration file.

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





                         30 November 1996                       1





HESIOD(3)                                               HESIOD(3)


EERRRROORRSS
       Hesiod calls may fail because of:

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

       ENOEXEC
              _h_e_s_i_o_d___i_n_i_t failed because the Hesiod configuration
              file was invalid.

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

       EMSGSIZE
              _h_e_s_i_o_d___r_e_s_o_l_v_e failed because the query or response
              was too big to fit into the packet buffers.

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

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

BBUUGGSS
       The strings corresponding to the _e_r_r_n_o values set  by  the
       Hesiod  functions  are not particularly indicative of what
       went wrong, especially for _E_N_O_E_X_E_C and _E_N_O_E_N_T.























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