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diff --git a/docs/nspr/reference/i_o_types.rst b/docs/nspr/reference/i_o_types.rst new file mode 100644 index 0000000000..16ec1bd705 --- /dev/null +++ b/docs/nspr/reference/i_o_types.rst @@ -0,0 +1,105 @@ +This chapter describes the most common NSPR types, enumerations, and +structures used with the functions described in `I/O +Functions <I%2f%2fO_Functions>`__ and `Network +Addresses <Network_Addresses>`__. These include the types used for +system access, normal file I/O, and socket (network) I/O. + +Types unique to a particular function are described with the function +itself. + +For sample code that illustrates basic I/O operations, see `Introduction +to NSPR <Introduction_to_NSPR>`__. + +- `Directory Type <#Directory_Type>`__ +- `File Descriptor Types <#File_Descriptor_Types>`__ +- `File Info Types <#File_Info_Types>`__ +- `Network Address Types <#Network_Address_Types>`__ +- `Types Used with Socket Options + Functions <#Types_Used_with_Socket_Options_Functions>`__ +- `Type Used with Memory-Mapped + I/O <#Type_Used_with_Memory-Mapped_I/O>`__ +- `Offset Interpretation for Seek + Functions <#Offset_Interpretation_for_Seek_Functions>`__ + +.. _Directory_Type: + +Directory Type +-------------- + + - :ref:`PRDir` + +.. _File_Descriptor_Types: + +File Descriptor Types +--------------------- + +NSPR represents I/O objects, such as open files and sockets, by file +descriptors of type :ref:`PRFileDesc`. This section introduces +:ref:`PRFileDesc` and related types. + + - :ref:`PRFileDesc` + - :ref:`PRIOMethods` + - :ref:`PRFilePrivate` + - :ref:`PRDescIdentity` + +Note that the NSPR documentation follows the Unix convention of using +the term\ *files* to refer to many kinds of I/O objects. To refer +specifically to the files in a file system (that is, disk files), this +documentation uses the term\ *normal files*. + +:ref:`PRFileDesc` has an object-oriented flavor. An I/O function on a +:ref:`PRFileDesc` structure is carried out by invoking the corresponding +"method" in the I/O methods table (a structure of type :ref:`PRIOMethods`) +of the :ref:`PRFileDesc` structure (the "object"). Different kinds of I/O +objects (such as files and sockets) have different I/O methods tables, +thus implementing different behavior in response to the same I/O +function call. + +NSPR supports the implementation of layered I/O. Each layer is +represented by a :ref:`PRFileDesc` structure, and the :ref:`PRFileDesc` +structures for the layers are chained together. Each :ref:`PRFileDesc` +structure has a field (of type :ref:`PRDescIdentity`) to identify itself in +the layers. For example, the Netscape implementation of the Secure +Sockets Layer (SSL) protocol is implemented as an I/O layer on top of +NSPR's socket layer. + +.. _File_Info_Types: + +File Info Types +--------------- + + - :ref:`PRFileInfo` + - :ref:`PRFileInfo64` + - :ref:`PRFileType` + +.. _Network_Address_Types: + +Network Address Types +--------------------- + + - :ref:`PRNetAddr` + - :ref:`PRIPv6Addr` + +.. _Types_Used_with_Socket_Options_Functions: + +Types Used with Socket Options Functions +---------------------------------------- + + - :ref:`PRSocketOptionData` + - :ref:`PRSockOption` + - :ref:`PRLinger` + - :ref:`PRMcastRequest` + +.. _Type_Used_with_Memory-Mapped_I.2FO: + +Type Used with Memory-Mapped I/O +-------------------------------- + + - :ref:`PRFileMap` + +.. _Offset_Interpretation_for_Seek_Functions: + +Offset Interpretation for Seek Functions +---------------------------------------- + + - :ref:`PRSeekWhence` |