getnetbyaddr

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



NAME
       getnetent,  getnetbyname, getnetbyaddr, setnetent, endnetent - get net-
       work 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/net-
       works  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 endservent() 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
       BSD 4.3

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



BSD                               1993-05-15                      GETNETENT(3)