inet_pton(3) [redhat man page]

inet_pton(3)						     Linux Programmer's Manual						      inet_pton(3)

NAME

       inet_pton - Create a network address structure

SYNOPSIS

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

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

DESCRIPTION

       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:

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

       AF_INET6
	      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.

RETURN VALUE

       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.

SEE ALSO

       inet_ntop(3)

BUGS

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

Linux Man Page							    2000-12-18							      inet_pton(3)

INET_NTOP(3)						     Linux Programmer's Manual						      INET_NTOP(3)

NAME

       inet_ntop - convert IPv4 and IPv6 addresses from binary to text form

SYNOPSIS

       #include <arpa/inet.h>

       const char *inet_ntop(int af, const void *src,
			     char *dst, socklen_t size);

DESCRIPTION

       This  function converts the network address structure src in the af address family into a character string.  The resulting string is copied
       to the buffer pointed to by dst, which must be a non-NULL pointer.  The caller specifies the number of bytes available in  this	buffer	in
       the argument size.

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

       AF_INET
	      src points to a struct in_addr (in network byte order) which is converted to an IPv4 network address in the  dotted-decimal  format,
	      "ddd.ddd.ddd.ddd".  The buffer dst must be at least INET_ADDRSTRLEN bytes long.

       AF_INET6
	      src points to a struct in6_addr (in network byte order) which is converted to a representation of this address in the most appropri-
	      ate IPv6 network address format for this address.  The buffer dst must be at least INET6_ADDRSTRLEN bytes long.

RETURN VALUE

       On success, inet_ntop() returns a non-NULL pointer to dst.  NULL is returned if there was an error, with errno set to indicate the error.

ERRORS

       EAFNOSUPPORT
	      af was not a valid address family.

       ENOSPC The converted address string would exceed the size given by size.

CONFORMING TO

       POSIX.1-2001.  Note that RFC 2553 defines a prototype where the last argument size is of type size_t.  Many systems follow RFC 2553.  Glibc
       2.0 and 2.1 have size_t, but 2.2 and later have socklen_t.

BUGS

       AF_INET6 converts IPv4-mapped IPv6 addresses into an IPv6 format.

EXAMPLE

       See inet_pton(3).

SEE ALSO

       getnameinfo(3), inet(3), inet_pton(3)

COLOPHON

       This  page is part of release 3.44 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/.

Linux								    2008-11-11							      INET_NTOP(3)