1059b1c5bSMauro Carvalho Chehab.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2f9b2e8aaSMauro Carvalho Chehab.. c:namespace:: DTV.dmx 354f38fcaSMauro Carvalho Chehab 454f38fcaSMauro Carvalho Chehab.. _DMX_SET_BUFFER_SIZE: 554f38fcaSMauro Carvalho Chehab 654f38fcaSMauro Carvalho Chehab=================== 754f38fcaSMauro Carvalho ChehabDMX_SET_BUFFER_SIZE 854f38fcaSMauro Carvalho Chehab=================== 954f38fcaSMauro Carvalho Chehab 1054f38fcaSMauro Carvalho ChehabName 1154f38fcaSMauro Carvalho Chehab---- 1254f38fcaSMauro Carvalho Chehab 1354f38fcaSMauro Carvalho ChehabDMX_SET_BUFFER_SIZE 1454f38fcaSMauro Carvalho Chehab 1554f38fcaSMauro Carvalho ChehabSynopsis 1654f38fcaSMauro Carvalho Chehab-------- 1754f38fcaSMauro Carvalho Chehab 18f9b2e8aaSMauro Carvalho Chehab.. c:macro:: DMX_SET_BUFFER_SIZE 1954f38fcaSMauro Carvalho Chehab 20f9b2e8aaSMauro Carvalho Chehab``int ioctl(int fd, DMX_SET_BUFFER_SIZE, unsigned long size)`` 2154f38fcaSMauro Carvalho Chehab 2254f38fcaSMauro Carvalho ChehabArguments 2354f38fcaSMauro Carvalho Chehab--------- 2454f38fcaSMauro Carvalho Chehab 2554f38fcaSMauro Carvalho Chehab``fd`` 26f9b2e8aaSMauro Carvalho Chehab File descriptor returned by :c:func:`open()`. 2754f38fcaSMauro Carvalho Chehab 2854f38fcaSMauro Carvalho Chehab``size`` 2954f38fcaSMauro Carvalho Chehab Unsigned long size 3054f38fcaSMauro Carvalho Chehab 3154f38fcaSMauro Carvalho ChehabDescription 3254f38fcaSMauro Carvalho Chehab----------- 3354f38fcaSMauro Carvalho Chehab 3454f38fcaSMauro Carvalho ChehabThis ioctl call is used to set the size of the circular buffer used for 3554f38fcaSMauro Carvalho Chehabfiltered data. The default size is two maximum sized sections, i.e. if 3654f38fcaSMauro Carvalho Chehabthis function is not called a buffer size of ``2 * 4096`` bytes will be 3754f38fcaSMauro Carvalho Chehabused. 3854f38fcaSMauro Carvalho Chehab 3954f38fcaSMauro Carvalho ChehabReturn Value 4054f38fcaSMauro Carvalho Chehab------------ 4154f38fcaSMauro Carvalho Chehab 4254f38fcaSMauro Carvalho ChehabOn success 0 is returned. 4354f38fcaSMauro Carvalho Chehab 4454f38fcaSMauro Carvalho ChehabOn error -1 is returned, and the ``errno`` variable is set 4554f38fcaSMauro Carvalho Chehabappropriately. 4654f38fcaSMauro Carvalho Chehab 4754f38fcaSMauro Carvalho ChehabThe generic error codes are described at the 4854f38fcaSMauro Carvalho Chehab:ref:`Generic Error Codes <gen-errors>` chapter. 49