Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
INET_CIDR(3)		 BSD Library Functions Manual		  INET_CIDR(3)

     inet_cidr_ntop, inet_cidr_pton -- network translation routines

     #include <sys/types.h>
     #include <sys/socket.h>
     #include <netinet/in.h>
     #include <arpa/inet.h>

     inet_cidr_ntop(int	af, const void *src, int bits, char *dst,
	 size_t	size);

     inet_cidr_pton(int	af, const char *src, void *dst,	int *bits);

     These routines are	used for converting addresses to and from network and
     presentation forms	with CIDR (Classless Inter-Domain Routing) representa-
     tion, embedded net	mask.

     inet_cidr_ntop() converts an address from network to presentation format.

     af	describes the type of address that is being passed in src.  Currently
     only AF_INET is supported.

     src is an address in network byte order, its length is determined from

     bits specifies the	number of bits in the netmask unless it	is -1 in which
     case the CIDR representation is omitted.

     dst is a caller supplied buffer of	at least size bytes.

     inet_cidr_ntop() returns dst on success or	NULL.  Check errno for reason.

     inet_cidr_pton() converts and address from	presentation format, with op-
     tional CIDR reperesentation, to network format.  The resulting address is
     zero filled if there were insufficint bits	in src.

     af	describes the type of address that is being passed in via src and de-
     termines the size of dst.

     src is an address in presentation format.

     bits returns the number of	bits in	the netmask or -1 if a CIDR represen-
     tation was	not supplied.

     inet_cidr_pton() returns 0	on succces or -1 on error.  Check errno	for
     reason.  ENOENT indicates an invalid netmask.


4th Berkeley Distribution      October 19, 1998	     4th Berkeley Distribution


Want to link to this manual page? Use this URL:

home | help