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85 lines
2.3 KiB
ReStructuredText
85 lines
2.3 KiB
ReStructuredText
PRNetAddr
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=========
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Type used with `Socket Manipulation
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Functions <Socket_Manipulation_Functions>`__ to specify a network
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address.
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Syntax
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------
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.. code::
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#include <prio.h>
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union PRNetAddr {
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struct {
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PRUint16 family;
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char data[14];
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} raw;
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struct {
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PRUint16 family;
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PRUint16 port;
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PRUint32 ip;
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char pad[8];
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} inet;
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#if defined(_PR_INET6)
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struct {
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PRUint16 family;
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PRUint16 port;
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PRUint32 flowinfo;
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PRIPv6Addr ip;
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} ipv6;
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#endif /* defined(_PR_INET6) */
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};
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typedef union PRNetAddr PRNetAddr;
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Fields
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~~~~~~
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The structure has the following fields:
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``family``
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Address family: ``PR_AF_INET|PR_AF_INET6`` for ``raw.family``,
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``PR_AF_INET`` for ``inet.family``, ``PR_AF_INET6`` for
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``ipv6.family``.
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``data``
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Raw address data.
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``port``
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Port number of TCP or UDP, in network byte order.
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``ip``
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The actual 32 (for ``inet.ip``) or 128 (for ``ipv6.ip``) bits of IP
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address. The ``inet.ip`` field is in network byte order.
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``pad``
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Unused.
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``flowinfo``
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Routing information.
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Description
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-----------
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The union :ref:`PRNetAddr` represents a network address. NSPR supports only
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the Internet address family. By default, NSPR is built to support only
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IPv4, but it's possible to build the NSPR library to support both IPv4
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and IPv6. Therefore, the ``family`` field can be ``PR_AF_INET`` only for
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default NSPR, and can also be ``PR_AF_INET6`` if the binary supports
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``IPv6``.
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:ref:`PRNetAddr` is binary-compatible with the socket address structures in
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the familiar Berkeley socket interface, although this fact should not be
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relied upon. The raw member of the union is equivalent to
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``struct sockaddr``, the ``inet`` member is equivalent to
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``struct sockaddr_in``, and if the binary is built with ``IPv6``
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support, the ``ipv6`` member is equivalent to ``struct sockaddr_in6``.
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(Note that :ref:`PRNetAddr` does not have the ``length`` field that is
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present in ``struct sockaddr_in`` on some Unix platforms.)
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The macros ``PR_AF_INET``, ``PR_AF_INET6``, ``PR_INADDR_ANY``,
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``PR_INADDR_LOOPBACK`` are defined if ``prio.h`` is included.
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``PR_INADDR_ANY`` and ``PR_INADDR_LOOPBACK`` are special ``IPv4``
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addresses in host byte order, so they must be converted to network byte
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order before being assigned to the ``inet.ip`` field.
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