getnetent man page on 4.4BSD

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getnetent(3)							  getnetent(3)

       getnetent,  getnetbyaddr, getnetbyname, setnetent, endnetent - get net‐
       works entry

       #include <netdb.h>

       struct netent *getnetent()

       struct netent *getnetbyname(name)
       char *name;

       struct netent *getnetbyaddr(net, type)
       long net; int type;

       void setnetent(stayopen)
       int stayopen;

       void endnetent()

       The getnetent, getnetbyname, and getnetbyaddr subroutines each return a
       pointer	to  an object with the following structure containing the bro‐
       ken-out fields of a line in the networks database.

	      struct	netent {
		   char *n_name;  /* official name of net */
		   char **n_aliases;   /* alias list */
		   int	n_addrtype;    /* net number type */
		   long n_net;	       /* net number */

       The members of this structure are:

       n_name	   The official name of the network.

       n_aliases   A zero terminated list of alternate names for the network.

       n_addrtype  The type of the network number returned: AF_INET.

       n_net	   The	network	 number.   Network  numbers  are  returned  in
		   machine byte order.

       If  the	stayopen  flag on a setnetent subroutine is NULL, the networks
       database is opened.  Otherwise the setnetent has the effect of  rewind‐
       ing  the	 networks  database.  The endnetent may be called to close the
       networks database when processing is complete.

       The getnetent subroutine simply reads the next line while  getnetbyname
       and  getnetbyaddr  search  until a matching name or net number is found
       (or until EOF is encountered).  The type must be AF_INET.   The	getne‐
       tent  subroutine	 keeps	a pointer in the database, allowing successive
       calls to be used to search the entire file.

       A call to setnetent must be made before a while loop using getnetent in
       order to perform initialization and an endnetent must be used after the
       loop.  Both getnetbyname and getnetbyaddr make calls to	setnetent  and
       endnetent .


       Null pointer (0) returned on EOF or error.

       RFC 1101

       The  getnetent(), getnetbyaddr(), getnetbyname(), setnetent(), and end‐
       netent() functions appeared in 4.2BSD.

       The data space used  by	these  functions  is  static;  if  future  use
       requires	 the  data, it should be copied before any subsequent calls to
       these functions overwrite it.  Only Internet network numbers  are  cur‐
       rently understood.  Expecting network numbers to fit in no more than 32
       bits is probably naive.


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