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diff --git a/docs/nspr/reference/priomethods.rst b/docs/nspr/reference/priomethods.rst new file mode 100644 index 0000000000..8e50ae1781 --- /dev/null +++ b/docs/nspr/reference/priomethods.rst @@ -0,0 +1,132 @@ +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``. |