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



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

SYNOPSIS
       #include <netdb.h>

       struct netent *getnetent(void);

       struct netent *getnetbyname(const char *name);

       struct netent *getnetbyaddr(uint32_t net, int type);

       void setnetent(int stayopen);

       void endnetent(void);

DESCRIPTION
       The  getnetent()  function  reads the next entry from the networks database and returns a netent structure containing the
       broken-out fields from the entry.  A connection is opened to the database if necessary.

       The getnetbyname() function returns a netent structure for the entry from the database that matches the network name.

       The getnetbyaddr() function returns a netent structure for the entry from the database that matches  the  network  number
       net of type type.  The net argument must be in host byte order.

       The  setnetent() function opens a connection to the database, and sets the next entry to the first entry.  If stayopen is
       nonzero, then the connection to the database will not be closed between calls to one of the getnet*() functions.

       The endnetent() function closes the connection to the database.

       The netent structure is defined in <netdb.h> as follows:

           struct netent {
               char      *n_name;     /* official network name */
               char     **n_aliases;  /* alias list */
               int        n_addrtype; /* net address type */
               uint32_t   n_net;      /* network number */
           }

       The members of the netent structure are:

       n_name The official name of the network.

       n_aliases
              A NULL-terminated list of alternative names for the network.

       n_addrtype
              The type of the network number; always AF_INET.

       n_net  The network number in host byte order.

RETURN VALUE
       The getnetent(), getnetbyname() and getnetbyaddr() functions return a pointer to a statically allocated netent structure,
       or a NULL pointer if an error occurs or the end of the file is reached.

FILES
       /etc/networks
              networks database file

CONFORMING TO
       4.3BSD, POSIX.1-2001.

NOTES
       In glibc versions before 2.2, the net argument of getnetbyaddr() was of type long.

SEE ALSO
       getnetent_r(3), getprotoent(3), getservent(3)
       RFC 1101

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                                                        2008-08-19                                               GETNETENT(3)