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69 lines
1.8 KiB
ReStructuredText
69 lines
1.8 KiB
ReStructuredText
PRHostEnt
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=========
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A structure that defines a list of network addresses. This structure is
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output from :ref:`PR_GetHostByName` and :ref:`PR_GetHostByAddr` and passed to
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:ref:`PR_EnumerateHostEnt`. Clients should avoid directly accessing any of
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the structure's fields.
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Syntax
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------
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.. code::
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#include <prnetdb.h>
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typedef struct PRHostEnt {
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char *h_name;
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char **h_aliases;
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#if defined(_WIN32)
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PRInt16 h_addrtype;
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PRInt16 h_length;
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#else
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PRInt32 h_addrtype;
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PRInt32 h_length;
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#endif
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char **h_addr_list;
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} PRHostEnt;
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Fields
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~~~~~~
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The structure has the following fields:
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``h_name``
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Pointer to the official name of host.
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``h_aliases``
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Pointer to a pointer to list of aliases. The list is terminated with
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a ``NULL`` entry.
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``h_addrtype``
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Host address type. For valid NSPR usage, this field must have a value
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indicating either an IPv4 or an IPv6 address.
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``h_length``
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Length of internal representation of the address in bytes. All of the
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addresses in the list are of the same type and therefore of the same
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length.
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``h_addr_list``
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Pointer to a pointer to a list of addresses from name server (in
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network byte order). The list is terminated with a ``NULL`` entry.
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Description
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-----------
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This structure is used by many of the network address functions. All
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addresses are passed in host order and returned in network order
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(suitable for use in system calls).
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Use the network address functions to manipulate the :ref:`PRHostEnt`
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structure. To make the transition to IP version 6 easier, it's best to
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treat :ref:`PRHostEnt` as an opaque structure.
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Note
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----
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``WINSOCK.H`` defines ``h_addrtype`` and ``h_length`` as a 16-bit field,
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whereas other platforms treat it as a 32-bit field. The ``#ifdef`` in
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the structure allows direct assignment of the :ref:`PRHostEnt` structure.
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