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_fwrite:
^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 write()
^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 write()
^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:: ssize_t write(int fd, const 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 with data to be written
^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)     Number of bytes at the buffer
^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 is only provided by the logical device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) ``/dev/dvb/adapter?/dvr?``, associated with the physical demux device that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) provides the actual DVR functionality. It is used for replay of a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) digitally recorded Transport Stream. Matching filters have to be defined
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) in the corresponding physical demux device, ``/dev/dvb/adapter?/demux?``.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) The amount of data to be transferred is implied by count.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) Return Value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) ------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) On success 0 is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) On error -1 is returned, and the ``errno`` variable is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) appropriately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .. flat-table::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)     :header-rows:  0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)     :stub-columns: 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)     :widths: 1 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)     -  -  ``EWOULDBLOCK``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)        -  No data was written. This might happen if ``O_NONBLOCK`` was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	  specified and there is no more buffer space available (if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	  ``O_NONBLOCK`` is not specified the function will block until buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	  space is available).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)     -  -  ``EBUSY``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)        -  This error code indicates that there are conflicting requests. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	  corresponding demux device is setup to receive data from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	  front- end. Make sure that these filters are stopped and that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	  filters with input set to ``DMX_IN_DVR`` are started.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) The generic error codes are described at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) :ref:`Generic Error Codes <gen-errors>` chapter.