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1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 fe-open - Open a frontend device
18 .. code-block:: c
53 The device can be opened in read-only mode, which only allows monitoring
57 In a system with multiple front-ends, it is usually the case that
59 long as a front-end device is opened in read/write mode, other open()
61 non-blocking or blocking mode was specified. A front-end device opened
62 in blocking mode can later be put into non-blocking mode (and vice
67 powered up, and that other front-ends may have been powered down to make
74 On error, -1 is returned, and the ``errno`` variable is set appropriately.
80 On error -1 is returned, and the ``errno`` variable is set
85 .. flat-table::
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90     -  - ``EPERM``
91        -  The caller has no permission to access the device.
93     -  - ``EBUSY``
94        -  The the device driver is already in use.
96     -  - ``EMFILE``
97        -  The process already has the maximum number of files open.
99     -  - ``ENFILE``
100        -  The limit on the total number of files open on the system has been
104 :ref:`Generic Error Codes <gen-errors>` chapter.