1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.
2 .. c:namespace:: MC
3
4 .. _request-func-ioctl:
5
6 ***************
7 request ioctl()
8 ***************
9
10 Name
11 ====
12
13 request-ioctl - Control a request file descrip
14
15 Synopsis
16 ========
17
18 .. code-block:: c
19
20 #include <sys/ioctl.h>
21
22 ``int ioctl(int fd, int cmd, void *argp)``
23
24 Arguments
25 =========
26
27 ``fd``
28 File descriptor returned by :ref:`MEDIA_IO
29
30 ``cmd``
31 The request ioctl command code as defined
32 example :ref:`MEDIA_REQUEST_IOC_QUEUE`.
33
34 ``argp``
35 Pointer to a request-specific structure.
36
37 Description
38 ===========
39
40 The :ref:`ioctl() <request-func-ioctl>` functi
41 parameters. The argument ``fd`` must be an ope
42
43 The ioctl ``cmd`` code specifies the request f
44 has encoded in it whether the argument is an i
45 parameter, and the size of the argument ``argp
46
47 Macros and structures definitions specifying r
48 their parameters are located in the media.h he
49 commands, their respective function and parame
50 :ref:`media-user-func`.
51
52 Return Value
53 ============
54
55 On success 0 is returned, on error -1 and the
56 appropriately. The generic error codes are des
57 :ref:`Generic Error Codes <gen-errors>` chapte
58
59 Command-specific error codes are listed in the
60 descriptions.
61
62 When an ioctl that takes an output or read/wri
63 parameter remains unmodified.
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