4.3BSD-UWisc/man/cat3/getnetent.3n

GETNETENT(3N)       UNIX Programmer's Manual        GETNETENT(3N)



NAME
     getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent
     - get network 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 necessary.

     _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



Printed 12/27/86          May 19, 1986                          1






GETNETENT(3N)       UNIX Programmer's Manual        GETNETENT(3N)



     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 understood.  Expecting network numbers to  fit
     in no more than 32 bits is probably naive.
































Printed 12/27/86          May 19, 1986                          2