inet_pton - Create a network address structure


  1. include <sys/types.h>
  2. include <sys/socket.h>
  3. include <arpa/inet.h>

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


This function converts the character string src into a network address structure in the af address family, then copies the network address structure to dst.

inet_pton(3) extends the inet_addr(3) function to support multiple address families, inet_addr(3) is now considered to be deprecated in favor of inet_pton(3). The following address families are currently supported:

src points to a character string containing an IPv4 network address in the dotted-quad format, ddd.ddd.ddd.ddd struct in_addr and copied to dst, which must be sizeof(struct in_addr) bytes long.
src points to a character string containing an IPv6 network address in any allowed IPv6 address format. The address is converted to a struct in6_addr and copied to dst, which must be sizeof(struct in6_addr) bytes long.

Certain legacy hex and octal formats of AF_INET addresses are not supported by inet_pton, which rejects them.


inet_pton returns a negative value and sets errno to EAFNOSUPPORT if af does not contain a valid address family. 0 is returned if src does not contain a character string representing a valid network address in the specified address family. A positive value is returned if the network address was successfully converted.




AF_INET6 does not recognize IPv4 addresses. An explicit IPv6-mapped IPv4 address must be supplied in src instead.

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