• 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 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 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 3.19 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/.

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