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

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

       #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);

       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

       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.

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

              The type of the network number; always AF_INET.

       n_net  The network number in host byte order.

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

              networks database file

       4.3BSD, POSIX.1-2001.

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

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

       This page is part of release 3.53 of the Linux man-pages project.  A  description  of  the
       project,     and    information    about    reporting    bugs,    can    be    found    at

GNU                                         2008-08-19                               GETNETENT(3)

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