getnetent - phpMan

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(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/net-
       works 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 get-
       netbyaddr().

       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 int 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



BSD                               1993-05-15                      GETNETENT(3)

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