18c2ecf20Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 28c2ecf20Sopenharmony_ci.. c:namespace:: DTV.audio 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci.. _audio_fopen: 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci======================= 78c2ecf20Sopenharmony_ciDigital TV audio open() 88c2ecf20Sopenharmony_ci======================= 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciName 118c2ecf20Sopenharmony_ci---- 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ciDigital TV audio open() 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci.. attention:: This ioctl is deprecated 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ciSynopsis 188c2ecf20Sopenharmony_ci-------- 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ci.. c:function:: int open(const char *deviceName, int flags) 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ciArguments 238c2ecf20Sopenharmony_ci--------- 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ci.. flat-table:: 268c2ecf20Sopenharmony_ci :header-rows: 0 278c2ecf20Sopenharmony_ci :stub-columns: 0 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci - .. row 1 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ci - const char \*deviceName 328c2ecf20Sopenharmony_ci 338c2ecf20Sopenharmony_ci - Name of specific audio device. 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci - .. row 2 368c2ecf20Sopenharmony_ci 378c2ecf20Sopenharmony_ci - int flags 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_ci - A bit-wise OR of the following flags: 408c2ecf20Sopenharmony_ci 418c2ecf20Sopenharmony_ci - .. row 3 428c2ecf20Sopenharmony_ci 438c2ecf20Sopenharmony_ci - 448c2ecf20Sopenharmony_ci - O_RDONLY read-only access 458c2ecf20Sopenharmony_ci 468c2ecf20Sopenharmony_ci - .. row 4 478c2ecf20Sopenharmony_ci 488c2ecf20Sopenharmony_ci - 498c2ecf20Sopenharmony_ci - O_RDWR read/write access 508c2ecf20Sopenharmony_ci 518c2ecf20Sopenharmony_ci - .. row 5 528c2ecf20Sopenharmony_ci 538c2ecf20Sopenharmony_ci - 548c2ecf20Sopenharmony_ci - O_NONBLOCK open in non-blocking mode 558c2ecf20Sopenharmony_ci 568c2ecf20Sopenharmony_ci - .. row 6 578c2ecf20Sopenharmony_ci 588c2ecf20Sopenharmony_ci - 598c2ecf20Sopenharmony_ci - (blocking mode is the default) 608c2ecf20Sopenharmony_ci 618c2ecf20Sopenharmony_ciDescription 628c2ecf20Sopenharmony_ci----------- 638c2ecf20Sopenharmony_ci 648c2ecf20Sopenharmony_ciThis system call opens a named audio device (e.g. 658c2ecf20Sopenharmony_ci/dev/dvb/adapter0/audio0) for subsequent use. When an open() call has 668c2ecf20Sopenharmony_cisucceeded, the device will be ready for use. The significance of 678c2ecf20Sopenharmony_ciblocking or non-blocking mode is described in the documentation for 688c2ecf20Sopenharmony_cifunctions where there is a difference. It does not affect the semantics 698c2ecf20Sopenharmony_ciof the open() call itself. A device opened in blocking mode can later be 708c2ecf20Sopenharmony_ciput into non-blocking mode (and vice versa) using the F_SETFL command 718c2ecf20Sopenharmony_ciof the fcntl system call. This is a standard system call, documented in 728c2ecf20Sopenharmony_cithe Linux manual page for fcntl. Only one user can open the Audio Device 738c2ecf20Sopenharmony_ciin O_RDWR mode. All other attempts to open the device in this mode will 748c2ecf20Sopenharmony_cifail, and an error code will be returned. If the Audio Device is opened 758c2ecf20Sopenharmony_ciin O_RDONLY mode, the only ioctl call that can be used is 768c2ecf20Sopenharmony_ciAUDIO_GET_STATUS. All other call will return with an error code. 778c2ecf20Sopenharmony_ci 788c2ecf20Sopenharmony_ciReturn Value 798c2ecf20Sopenharmony_ci------------ 808c2ecf20Sopenharmony_ci 818c2ecf20Sopenharmony_ci.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| 828c2ecf20Sopenharmony_ci 838c2ecf20Sopenharmony_ci.. flat-table:: 848c2ecf20Sopenharmony_ci :header-rows: 0 858c2ecf20Sopenharmony_ci :stub-columns: 0 868c2ecf20Sopenharmony_ci 878c2ecf20Sopenharmony_ci - .. row 1 888c2ecf20Sopenharmony_ci 898c2ecf20Sopenharmony_ci - ``ENODEV`` 908c2ecf20Sopenharmony_ci 918c2ecf20Sopenharmony_ci - Device driver not loaded/available. 928c2ecf20Sopenharmony_ci 938c2ecf20Sopenharmony_ci - .. row 2 948c2ecf20Sopenharmony_ci 958c2ecf20Sopenharmony_ci - ``EBUSY`` 968c2ecf20Sopenharmony_ci 978c2ecf20Sopenharmony_ci - Device or resource busy. 988c2ecf20Sopenharmony_ci 998c2ecf20Sopenharmony_ci - .. row 3 1008c2ecf20Sopenharmony_ci 1018c2ecf20Sopenharmony_ci - ``EINVAL`` 1028c2ecf20Sopenharmony_ci 1038c2ecf20Sopenharmony_ci - Invalid argument. 104