cc [ flag... ] file... –lresolv –lsocket –lnsl [ library...]
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
char *inet_cidr_ntop(int af, const void *src, int bits, char *dst,
size_t size);
int 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) representation, embedded net mask.
The inet_cidr_ntop() function converts an address from network to presentation format.
The af parameter describes the type of address that is being passed in src. Currently only AF_INET is supported.
The src parameter is an address in network byte order, its length is determined from af.
The bits parameter specifies the number of bits in the netmask unless it is -1 in which case the CIDR representation is omitted.
The dst parameter is a caller supplied buffer of at least size bytes.
The inet_cidr_ntop() function returns dst on success or NULL. Check errno for reason.
The inet_cidr_pton() function converts and address from presentation format, with optional CIDR representation, to network format. The resulting address is zero filled if there were insufficient bits in src.
The af parameter describes the type of address that is being passed in via src and determines the size of dst.
The src parameter is an address in presentation format.
The bits parameter returns the number of bits in the netmask or -1 if a CIDR representation was not supplied.
The inet_cidr_pton() function returns 0 on success or -1 on error. Check errno for reason. ENOENT indicates an invalid netmask.
See attributes(5) for descriptions of the following attributes:
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