Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) .. c:namespace:: DTV.dmx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) .. _dmx_fread:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) =======================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) Digital TV demux read()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) =======================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) Name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) ----
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) Digital TV demux read()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) Synopsis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) --------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) .. c:function:: size_t read(int fd, void *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) Arguments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) ---------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) ``fd``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)   File descriptor returned by a previous call to :c:func:`open()`.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  ``buf``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)    Buffer to be filled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) ``count``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)    Max number of bytes to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) Description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) -----------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) This system call returns filtered data, which might be section or Packetized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) Elementary Stream (PES) data. The filtered data is transferred from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) the driver’s internal circular buffer to ``buf``. The maximum amount of data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) to be transferred is implied by count.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) .. note::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)    if a section filter created with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)    :c:type:`DMX_CHECK_CRC <dmx_sct_filter_params>` flag set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)    data that fails on CRC check will be silently ignored.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) Return Value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) ------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) On success 0 is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) On error -1 is returned, and the ``errno`` variable is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) appropriately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) .. flat-table::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)     :header-rows:  0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)     :stub-columns: 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)     :widths: 1 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)     -  -  ``EWOULDBLOCK``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)        -  No data to return and ``O_NONBLOCK`` was specified.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)     -  -  ``EOVERFLOW``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)        -  The filtered data was not read from the buffer in due time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	  resulting in non-read data being lost. The buffer is flushed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)     -  -  ``ETIMEDOUT``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)        -  The section was not loaded within the stated timeout period.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)           See ioctl :ref:`DMX_SET_FILTER` for how to set a timeout.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)     -  -  ``EFAULT``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)        -  The driver failed to write to the callers buffer due to an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)           invalid \*buf pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) The generic error codes are described at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) :ref:`Generic Error Codes <gen-errors>` chapter.