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 <> 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 infor- mation, 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 information 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 argument. _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 element 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 specifies the location of the Hesiod configu- ration file. SSEEEE AALLSSOO `Hesiod - Project Athena Technical Plan -- Name Service' 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 func- tions are not particularly indicative of what went wrong, especially for _E_N_O_E_X_E_C and _E_N_O_E_N_T. 30 November 1996 HESIOD(3)