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+PRIOMethods
+===========
+
+The table of I/O methods used in a file descriptor.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   struct PRIOMethods {
+     PRDescType file_type;
+     PRCloseFN close;
+     PRReadFN read;
+     PRWriteFN write;
+     PRAvailableFN available;
+     PRAvailable64FN available64;
+     PRFsyncFN fsync;
+     PRSeekFN seek;
+     PRSeek64FN seek64;
+     PRFileInfoFN fileInfo;
+     PRFileInfo64FN fileInfo64;
+     PRWritevFN writev;
+     PRConnectFN connect;
+     PRAcceptFN accept;
+     PRBindFN bind;
+     PRListenFN listen;
+     PRShutdownFN shutdown;
+     PRRecvFN recv;
+     PRSendFN send;
+     PRRecvfromFN recvfrom;
+     PRSendtoFN sendto;
+     PRPollFN poll;
+     PRAcceptreadFN acceptread;
+     PRTransmitfileFN transmitfile;
+     PRGetsocknameFN getsockname;
+     PRGetpeernameFN getpeername;
+     PRGetsockoptFN getsockopt;
+     PRSetsockoptFN setsockopt;
+   };
+
+   typedef struct PRIOMethods PRIOMethods;
+
+
+Parameters
+~~~~~~~~~~
+
+``file_type``
+   Type of file represented (tos).
+``close``
+   Close file and destroy descriptor.
+``read``
+   Read up to the specified number of bytes into buffer.
+``write``
+   Write specified number of bytes from buffer.
+``available``
+   Determine number of bytes available for reading.
+``available64``
+   Same as previous field, except 64-bit.
+``fsync``
+   Flush all in-memory buffers of file to permanent store.
+``seek``
+   Position the file pointer to the desired place.
+``seek64``
+   Same as previous field, except 64-bit.
+``fileInfo``
+   Get information about an open file.
+``fileInfo64``
+   Same as previous field, except 64-bit.
+``writev``
+   Write from a vector of buffers.
+``connect``
+   Connect to the specified network address.
+``accept``
+   Accept a connection from a network peer.
+``bind``
+   Associate a network address with the file descriptor.
+``listen``
+   Prepare to listen for network connections.
+``shutdown``
+   Shut down a network connection.
+``recv``
+   Receive up to the specified number of bytes.
+``send``
+   Send all the bytes specified.
+``recvfrom``
+   Receive up to the specified number of bytes and report network
+   source.
+``sendto``
+   Send bytes to specified network address.
+``poll``
+   Test the file descriptor to see if it is ready for I/O.
+``acceptread``
+   Accept and read from a new network file descriptor.
+``transmitfile``
+   Transmit an entire file to the specified socket.
+``getsockname``
+   Get network address associated with a file descriptor.
+``getpeername``
+   Get peer's network address.
+``getsockopt``
+   Get current setting of specified socket option.
+``setsockopt``
+   Set value of specified socket option.
+
+
+Description
+-----------
+
+You don't need to know the type declaration for each function listed in
+the method table unless you are implementing a layer. For information
+about each function, see the corresponding function description in this
+document. For example, the ``write`` method in :ref:`PRIOMethods`
+implements the :ref:`PR_Write` function. For type definition details, see
+``prio.h``.
+
+The I/O methods table provides procedural access to the functions of the
+file descriptor. It is the responsibility of a layer implementor to
+provide suitable functions at every entry point (that is, for every
+function in the I/O methods table). If a layer provides no
+functionality, it should call the next lower (higher) function of the
+same name (for example, the "close" method would return
+``fd->lower->method->close(fd->lower)``).
+
+Not all functions in the methods table are implemented for all types of
+files. For example, the seek method is implemented for normal files but
+not for sockets. In cases where this partial implementation occurs, the
+function returns an error indication with an error code of
+``PR_INVALID_METHOD_ERROR``.