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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(long net, int type);

       void setnetent(int stayopen);

       void endnetent(void);

DESCRIPTION

       The  getnetent()  function  reads  the  next   line   from   the   file
       /etc/networks  and returns a structure netent containing the broken out
       fields from the line.  The /etc/networks file is opened if necessary.

       The getnetbyname() function returns a netent  structure  for  the  line
       from /etc/networks that matches the network name.

       The  getnetbyaddr()  function  returns  a netent structure for the line
       that matches the network number net of type type.

       The setnetent() function opens and rewinds the /etc/networks file.   If
       stayopen is true (1), then the file will not be closed between calls to
       getnetbyname() and getnetbyaddr().

       The endnetent() function closes /etc/networks.

       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 */
               unsigned long  n_net;      /* network number */
           }

       The members of the netent structure are:

       n_name The official name of the network.

       n_aliases
              A zero 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 the
       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.

SEE ALSO

       getprotoent(3), getservent(3), networks(5)
       RFC 1101

COLOPHON

       This page is part of release 2.77 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/.