MirBSD manpage: endnetent(3), getnetbyaddr(3), getnetbyname(3), getnetent(3), setnetent(3)

GETNETENT(3)               BSD Programmer's Manual                GETNETENT(3)


     getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent - get network


     #include <netdb.h>

     struct netent *

     struct netent *
     getnetbyname(const char *name);

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

     setnetent(int stayopen);



     The getnetent(), getnetbyname(), and getnetbyaddr() functions each return
     a pointer to an object with the following structure containing the
     broken-out fields of a line in the network database, /etc/networks.

           struct  netent {
                   char            *n_name;        /* official name of net */
                   char            **n_aliases;    /* alias list */
                   int             n_addrtype;     /* net number type */
                   in_addr_t       n_net;          /* net number */

     The members of this structure are:

     n_name      The official name of the network.

     n_aliases   A null-terminated list of alternate names for the network.

     n_addrtype  The type of the network number returned; currently only

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

     The getnetent() function reads the next line of the file, opening the
     file if necessary.

     The setnetent() function opens and rewinds the file. If the stayopen flag
     is non-zero, the net database will not be closed after each call to get-
     netbyname() or getnetbyaddr().

     The endnetent() function closes the file.

     The getnetbyname() and getnetbyaddr() functions search the domain name
     server if the system is configured to use one. If the search fails, or no
     name server is configured, they 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.




     Null pointer (0) returned on EOF or error.


     resolver(3), networks(5)


     The getnetent(), getnetbyaddr(), getnetbyname(), setnetent(), and end-
     netent() functions appeared in 4.2BSD.


     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 naive.

MirBSD #10-current              March 13, 1997                               1

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