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- GETNETENT(3) BSD Programmer's Manual GETNETENT(3)
-
- NNAAMMEE
- ggeettnneetteenntt, ggeettnneettbbyyaaddddrr, ggeettnneettbbyynnaammee, sseettnneetteenntt, eennddnneetteenntt - get net-
- works entry
-
- SSYYNNOOPPSSIISS
- ##iinncclluuddee <<nneettddbb..hh>>
-
- _s_t_r_u_c_t _n_e_t_e_n_t _*
- ggeettnneetteenntt();
-
- _s_t_r_u_c_t _n_e_t_e_n_t _*
- ggeettnneettbbyynnaammee(_c_h_a_r _n_a_m_e);
-
- _s_t_r_u_c_t _n_e_t_e_n_t _*
- ggeettnneettbbyyaaddddrr(_u_n_s_i_g_n_e_d _l_o_n_g _n_e_t, _i_n_t _t_y_p_e);
-
- _v_o_i_d
- sseettnneetteenntt(_i_n_t _s_t_a_y_o_p_e_n);
-
- _v_o_i_d
- eennddnneetteenntt();
-
- DDEESSCCRRIIPPTTIIOONN
- The ggeettnneetteenntt(), ggeettnneettbbyynnaammee(), and ggeettnneettbbyyaaddddrr() subroutines each re-
- turn a pointer to an object with the following structure containing the
- broken-out fields of a line in the _n_e_t_w_o_r_k_s database.
-
- struct netent {
- char *n_name; /* official name of net */
- char **n_aliases; /* alias list */
- int n_addrtype; /* net number type */
- long n_net; /* net number */
- };
-
- The members of this structure are:
-
- n_name The official name of the network.
-
- n_aliases A zero-terminated list of alternate names for the network.
-
- n_addrtype The type of the network number returned: AF_INET.
-
- n_net The network number. Network numbers are returned in machine
- byte order.
-
- If the _s_t_a_y_o_p_e_n flag on a sseettnneetteenntt() subroutine is NULL, the _n_e_t_w_o_r_k_s
- database is opened. Otherwise, the sseettnneetteenntt() has the effect of rewind-
- ing the _n_e_t_w_o_r_k_s database. The eennddnneetteenntt() subroutine may be called to
- close the _n_e_t_w_o_r_k_s database when processing is complete.
-
- The ggeettnneetteenntt() subroutine simply reads the next line while
- ggeettnneettbbyynnaammee() and ggeettnneettbbyyaaddddrr() search until a matching _n_a_m_e or _n_e_t
- number is found (or until EOF is encountered). The _t_y_p_e _m_u_s_t _b_e AF_INET.
- The ggeettnneetteenntt() subroutine keeps a pointer in the database, allowing suc-
- cessive calls to be used to search the entire file.
-
- Before a wwhhiillee loop using ggeettnneetteenntt(), a call to sseettnneetteenntt() must be made
- in order to perform initialization; a call to eennddnneetteenntt() must be used
- after the loop. Both ggeettnneettbbyynnaammee() and ggeettnneettbbyyaaddddrr() make calls to
- sseettnneetteenntt() and eennddnneetteenntt().
-
- FFIILLEESS
- _/_e_t_c_/_n_e_t_w_o_r_k_s
-
- DDIIAAGGNNOOSSTTIICCSS
- Null pointer (0) returned on EOF or error.
-
- SSEEEE AALLSSOO
- networks(5), RFC 1101.
-
- HHIISSTTOORRYY
- The ggeettnneetteenntt(), ggeettnneettbbyyaaddddrr(), ggeettnneettbbyynnaammee(), sseettnneetteenntt(), and
- eennddnneetteenntt() functions appeared in 4.2BSD.
-
- BBUUGGSS
- The data space used by these functions is static; if future use requires
- the data, it should be copied before any subsequent calls to these func-
- tions overwrite it. Only Internet network numbers are currently under-
- stood. Expecting network numbers to fit in no more than 32 bits is prob-
- ably naive.
-
- 4th Berkeley Distribution May 20, 1996 2
-