18c2ecf20Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 28c2ecf20Sopenharmony_ci.. c:namespace:: DTV.dmx 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci.. _DMX_SET_BUFFER_SIZE: 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci=================== 78c2ecf20Sopenharmony_ciDMX_SET_BUFFER_SIZE 88c2ecf20Sopenharmony_ci=================== 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciName 118c2ecf20Sopenharmony_ci---- 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ciDMX_SET_BUFFER_SIZE 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ciSynopsis 168c2ecf20Sopenharmony_ci-------- 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ci.. c:macro:: DMX_SET_BUFFER_SIZE 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ci``int ioctl(int fd, DMX_SET_BUFFER_SIZE, unsigned long size)`` 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ciArguments 238c2ecf20Sopenharmony_ci--------- 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ci``fd`` 268c2ecf20Sopenharmony_ci File descriptor returned by :c:func:`open()`. 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_ci``size`` 298c2ecf20Sopenharmony_ci Unsigned long size 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ciDescription 328c2ecf20Sopenharmony_ci----------- 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ciThis ioctl call is used to set the size of the circular buffer used for 358c2ecf20Sopenharmony_cifiltered data. The default size is two maximum sized sections, i.e. if 368c2ecf20Sopenharmony_cithis function is not called a buffer size of ``2 * 4096`` bytes will be 378c2ecf20Sopenharmony_ciused. 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_ciReturn Value 408c2ecf20Sopenharmony_ci------------ 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ciOn success 0 is returned. 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ciOn error -1 is returned, and the ``errno`` variable is set 458c2ecf20Sopenharmony_ciappropriately. 468c2ecf20Sopenharmony_ci 478c2ecf20Sopenharmony_ciThe generic error codes are described at the 488c2ecf20Sopenharmony_ci:ref:`Generic Error Codes <gen-errors>` chapter. 49