1HESIOD(3) HESIOD(3) 2 3 4 5NNAAMMEE 6 hesiod, hesiod_init, hesiod_resolve, hesiod_free_list, hesiod_to_bind, 7 hesiod_end - Hesiod name server interface library 8 9SSYYNNOOPPSSIISS 10 ##iinncclluuddee <<hheessiioodd..hh>> 11 12 iinntt hheessiioodd__iinniitt((vvooiidd ****_c_o_n_t_e_x_t)) 13 cchhaarr ****hheessiioodd__rreessoollvvee((vvooiidd **_c_o_n_t_e_x_t,, ccoonnsstt cchhaarr **_n_a_m_e,, 14 ccoonnsstt cchhaarr **_t_y_p_e)) 15 vvooiidd hheessiioodd__ffrreeee__lliisstt((vvooiidd **_c_o_n_t_e_x_t,, cchhaarr ****_l_i_s_t));; 16 cchhaarr **hheessiioodd__ttoo__bbiinndd((vvooiidd **_c_o_n_t_e_x_t,, ccoonnsstt cchhaarr **_n_a_m_e,, 17 ccoonnsstt cchhaarr **_t_y_p_e)) 18 vvooiidd hheessiioodd__eenndd((vvooiidd **_c_o_n_t_e_x_t)) 19 20DDEESSCCRRIIPPTTIIOONN 21 This family of functions allows you to perform lookups of Hesiod infor- 22 mation, which is stored as text records in the Domain Name Service. To 23 perform lookups, you must first initialize a _c_o_n_t_e_x_t, an opaque object 24 which stores information used internally by the library between calls. 25 _h_e_s_i_o_d___i_n_i_t initializes a context, storing a pointer to the context in 26 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 27 resources used by a context. 28 29 _h_e_s_i_o_d___r_e_s_o_l_v_e is the primary interface to the library. If successful, 30 it returns a list of one or more strings giving the records matching 31 _n_a_m_e and _t_y_p_e. The last element of the list is followed by a NULL 32 pointer. It is the caller's responsibility to call _h_e_s_i_o_d___f_r_e_e___l_i_s_t to 33 free the resources used by the returned list. 34 35 _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_- 36 _i_o_d___r_e_s_o_l_v_e. It is the caller's responsibility to free the returned 37 string using _f_r_e_e. 38 39RREETTUURRNN VVAALLUUEESS 40 If successful, _h_e_s_i_o_d___i_n_i_t returns 0; otherwise it returns -1 and sets 41 _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_- 42 _i_o_d___t_o___b_i_n_d return NULL and set the global variable _e_r_r_n_o to indicate 43 the error. 44 45EENNVVIIRROONNMMEENNTT 46 If the environment variable HHEESS__DDOOMMAAIINN is set, it will override the 47 domain in the Hesiod configuration file. If the environment variable 48 HHEESSIIOODD__CCOONNFFIIGG is set, it specifies the location of the Hesiod configu- 49 ration file. 50 51SSEEEE AALLSSOO 52 `Hesiod - Project Athena Technical Plan -- Name Service' 53 54EERRRROORRSS 55 Hesiod calls may fail because of: 56 57 ENOMEM Insufficient memory was available to carry out the requested 58 operation. 59 60 ENOEXEC 61 _h_e_s_i_o_d___i_n_i_t failed because the Hesiod configuration file was 62 invalid. 63 64 ECONNREFUSED 65 _h_e_s_i_o_d___r_e_s_o_l_v_e failed because no name server could be contacted 66 to answer the query. 67 68 EMSGSIZE 69 _h_e_s_i_o_d___r_e_s_o_l_v_e failed because the query or response was too big 70 to fit into the packet buffers. 71 72 ENOENT _h_e_s_i_o_d___r_e_s_o_l_v_e failed because the name server had no text 73 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 74 the _n_a_m_e argument had a domain extension which could not be 75 resolved with type ``rhs-extension'' in the local Hesiod domain. 76 77AAUUTTHHOORR 78 Steve Dyer, IBM/Project Athena 79 Greg Hudson, MIT Team Athena 80 Copyright 1987, 1988, 1995, 1996 by the Massachusetts Institute of 81 Technology. 82 83BBUUGGSS 84 The strings corresponding to the _e_r_r_n_o values set by the Hesiod func- 85 tions are not particularly indicative of what went wrong, especially 86 for _E_N_O_E_X_E_C and _E_N_O_E_N_T. 87 88 89 90 30 November 1996 HESIOD(3) 91