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



NAME
       getnetent,  getnetbyname, getnetbyaddr, setnetent, endnetent - get net-
       work entry

SYNOPSIS
       #include <&lt;netdb.h>&gt;

       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 endnetent() function closes /etc/networks.

       The netent structure is defined in &lt;netdb.h&gt; 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 3.05 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/.



GNU                               1993-05-15                      GETNETENT(3)