1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 .. c:namespace:: MC 3 4 .. _media-func-open: 5 6 ************ 7 media open() 8 ************ 9 10 Name 11 ==== 12 13 media-open - Open a media device 14 15 Synopsis 16 ======== 17 18 .. code-block:: c 19 20 #include <fcntl.h> 21 22 .. c:function:: int open( const char *device_name, int flags ) 23 24 Arguments 25 ========= 26 27 ``device_name`` 28 Device to be opened. 29 30 ``flags`` 31 Open flags. Access mode must be either ``O_RDONLY`` or ``O_RDWR``. 32 Other flags have no effect. 33 34 Description 35 =========== 36 37 To open a media device applications call :c:func:`open()` with the 38 desired device name. The function has no side effects; the device 39 configuration remain unchanged. 40 41 When the device is opened in read-only mode, attempts to modify its 42 configuration will result in an error, and ``errno`` will be set to 43 EBADF. 44 45 Return Value 46 ============ 47 48 :c:func:`open()` returns the new file descriptor on success. On error, 49 -1 is returned, and ``errno`` is set appropriately. Possible error codes 50 are: 51 52 EACCES 53 The requested access to the file is not allowed. 54 55 EMFILE 56 The process already has the maximum number of files open. 57 58 ENFILE 59 The system limit on the total number of open files has been reached. 60 61 ENOMEM 62 Insufficient kernel memory was available. 63 64 ENXIO 65 No device corresponding to this device special file exists.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.