1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2
3 .. _gen_errors:
4
5 *******************
6 Generic Error Codes
7 *******************
8
9
10 .. _gen-errors:
11
12 .. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
13
14 .. flat-table:: Generic error codes
15 :header-rows: 0
16 :stub-columns: 0
17 :widths: 1 16
18
19
20 - - ``EAGAIN`` (aka ``EWOULDBLOCK``)
21
22 - The ioctl can't be handled because t
23 can't perform it. This could happen
24 device is sleeping and ioctl is perf
25 is also returned when the ioctl woul
26 but the device was opened in non-blo
27
28 - - ``EBADF``
29
30 - The file descriptor is not a valid.
31
32 - - ``EBUSY``
33
34 - The ioctl can't be handled because t
35 typically return while device is str
36 change something that would affect t
37 the usage of a hardware resource tha
38 ioctl must not be retried without pe
39 the problem first (typically: stop t
40
41 - - ``EFAULT``
42
43 - There was a failure while copying da
44 caused by an invalid pointer referen
45
46 - - ``EINVAL``
47
48 - One or more of the ioctl parameters
49 allowed range. This is a widely used
50 individual ioctl requests for specif
51
52 - - ``ENODEV``
53
54 - Device not found or was removed.
55
56 - - ``ENOMEM``
57
58 - There's not enough memory to handle
59
60 - - ``ENOTTY``
61
62 - The ioctl is not supported by the fi
63
64 - - ``ENOSPC``
65
66 - On USB devices, the stream ioctl's c
67 that this request would overcommit t
68 periodic transfers (up to 80% of the
69
70 - - ``EPERM``
71
72 - Permission denied. Can be returned i
73 permission, or some special capabili
74
75 - - ``EIO``
76
77 - I/O error. Typically used when there
78 a hardware device. This could indica
79 It's a 'Something is wrong, I give u
80
81 - - ``ENXIO``
82
83 - No device corresponding to this devi
84
85
86 .. note::
87
88 #. This list is not exhaustive; ioctls may r
89 Since errors may have side effects such a
90 applications should abort on unexpected e
91 assume that the device is in a bad state.
92
93 #. Request-specific error codes are listed i
94 requests descriptions.
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