GETNETENT(3N)                                                    GETNETENT(3N)



NAME
       getnetent,  getnetbyaddr, getnetbyname, setnetent, endnetent - get net‐
       work entry

SYNOPSIS
       #include <netdb.h>

       struct netent *getnetent()

       struct netent *getnetbyname(name)
       char *name;

       struct netent *getnetbyaddr(net, type)
       long net;
       int type;

       setnetent(stayopen)
       int stayopen;

       endnetent()

DESCRIPTION
       _G_e_t_n_e_t_e_n_t, _g_e_t_n_e_t_b_y_n_a_m_e, and _g_e_t_n_e_t_b_y_a_d_d_r each return a pointer  to  an
       object with the following structure containing the broken-out fields of
       a line in the network data base, _/_e_t_c_/_n_e_t_w_o_r_k_s.

              struct    netent {
                   char      *n_name;  /* official name of net */
                   char      **n_aliases;   /* alias list */
                   int       n_addrtype;    /* net number type */
                   unsigned 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; currently only
                   AF_INET.

       n_net       The  network  number.   Network  numbers  are  returned  in
                   machine byte order.

       _G_e_t_n_e_t_e_n_t  reads  the next line of the file, opening the file if neces‐
       sary.

       _S_e_t_n_e_t_e_n_t opens and rewinds the file.  If the  _s_t_a_y_o_p_e_n  flag  is  non-
       zero, the net data base will not be closed after each call to _g_e_t_n_e_t_b_y_‐
       _n_a_m_e or _g_e_t_n_e_t_b_y_a_d_d_r.

       _E_n_d_n_e_t_e_n_t closes the file.

       _G_e_t_n_e_t_b_y_n_a_m_e and _g_e_t_n_e_t_b_y_a_d_d_r sequentially search from the beginning of
       the file until a matching net name or net address and type is found, or
       until EOF is encountered.  Network numbers are supplied in host  order.

FILES
       /etc/networks

SEE ALSO
       networks(5)

DIAGNOSTICS
       Null pointer (0) returned on EOF or error.

BUGS
       All  information  is contained in a static area so it must be copied if
       it is to be saved.  Only Internet network numbers are currently  under‐
       stood.   Expecting  network  numbers  to fit in no more than 32 bits is
       probably naive.



4.2 Berkeley Distribution        May 19, 1986                    GETNETENT(3N)