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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 con-
       nection 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 non-zero, 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 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



GNU                               2008-08-19                      GETNETENT(3)

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