50 lines
952 B
ReStructuredText
50 lines
952 B
ReStructuredText
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: DTV.fe
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.. _FE_READ_SIGNAL_STRENGTH:
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***********************
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FE_READ_SIGNAL_STRENGTH
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***********************
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Name
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====
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FE_READ_SIGNAL_STRENGTH
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.. attention:: This ioctl is deprecated.
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Synopsis
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========
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.. c:macro:: FE_READ_SIGNAL_STRENGTH
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``int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)``
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Arguments
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=========
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``fd``
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File descriptor returned by :c:func:`open()`.
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``strength``
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The signal strength value is stored into \*strength.
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Description
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===========
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This ioctl call returns the signal strength value for the signal
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currently received by the front-end. For this command, read-only access
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to the device is sufficient.
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Return Value
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============
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On success 0 is returned.
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On error -1 is returned, and the ``errno`` variable is set
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appropriately.
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Generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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