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linux/Documentation/linux_tv/media/dvb/FE_GET_EVENT.rst

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doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
.. -*- coding: utf-8; mode: rst -*-
.. _FE_GET_EVENT:
************
FE_GET_EVENT
************
doc-rst: FE_GET_EVENT: improve man-like format Parsing this file were causing lots of warnings with sphinx, due to the c function prototypes. Fix that by prepending them with .. c:function:: While here, use the same way we document man-like pages, at the V4L side of the book and add escapes to asterisks. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-04 23:39:49 +08:00
Description
-----------
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
This ioctl call returns a frontend event if available. If an event is
not available, the behavior depends on whether the device is in blocking
or non-blocking mode. In the latter case, the call fails immediately
doc-rst: linux_tv: Error codes should be const All error codes should be const. Most are, but there are lots of places where we forgot to add <constant> at the DocBook. Fix those via this small script: for i in $(git grep -lE "\s+E[A-Z]+\b" Documentation/linux_tv/); do perl -ne 's,([^\`])\b(E[A-Z]+)\b,\1``\2``,g; print $_' <$i >a && mv a $i; done As there are false positives, we needed to merge only the changes that make sense, skipping the c blocks and skipping things like EDID, EN, ETS that were also converted by the above code. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-03 22:53:09 +08:00
with errno set to ``EWOULDBLOCK``. In the former case, the call blocks until
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
an event becomes available.
doc-rst: FE_GET_EVENT: improve man-like format Parsing this file were causing lots of warnings with sphinx, due to the c function prototypes. Fix that by prepending them with .. c:function:: While here, use the same way we document man-like pages, at the V4L side of the book and add escapes to asterisks. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-04 23:39:49 +08:00
Synopsis
--------
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
doc-rst: FE_GET_EVENT: improve man-like format Parsing this file were causing lots of warnings with sphinx, due to the c function prototypes. Fix that by prepending them with .. c:function:: While here, use the same way we document man-like pages, at the V4L side of the book and add escapes to asterisks. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-04 23:39:49 +08:00
.. c:function:: int ioctl(int fd, int request = QPSK_GET_EVENT, struct dvb_frontend_event *ev)
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
doc-rst: FE_GET_EVENT: improve man-like format Parsing this file were causing lots of warnings with sphinx, due to the c function prototypes. Fix that by prepending them with .. c:function:: While here, use the same way we document man-like pages, at the V4L side of the book and add escapes to asterisks. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-04 23:39:49 +08:00
Arguments
----------
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
.. flat-table::
:header-rows: 0
:stub-columns: 0
- .. row 1
- int fd
- File descriptor returned by a previous call to open().
- .. row 2
- int request
doc-rst: linux_tv: simplify references There are lots of internal references in the form: :ref:`foo <foo>` Simplify them to be just: :ref:`foo`. Patch generated via this small script: for j in $(find . -name '*'); do echo $j; perl -ne 'if (m/\`(\S+)\s*\<(\S+)\>\`/) { if (!($1=~'http') && $1 eq $2) { s,\s*\<(\S+)\>,,; } } print $_' <$j >a && mv a $j; done Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-02 00:58:44 +08:00
- Equals :ref:`FE_GET_EVENT` for this command.
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
- .. row 3
doc-rst: linux_tv: fix remaining lack of escapes Add escape before asterisk to fix those warnings: Documentation/linux_tv/media/dvb/FE_GET_EVENT:47: WARNING: Inline emphasis start-string without end-string. Documentation/linux_tv/media/v4l/media-ioc-enum-links:78: WARNING: Inline emphasis start-string without end-string. Documentation/linux_tv/media/v4l/media-ioc-enum-links:87: WARNING: Inline emphasis start-string without end-string. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-04 23:46:04 +08:00
- struct dvb_frontend_event \*ev
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
- Points to the location where the event,
- .. row 4
doc-rst: linux_tv: remove whitespaces Let's remove bad whitespaces on the entire book. That helps to avoid mixing whitespace removal with other patches. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-05 03:25:48 +08:00
-
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
- if any, is to be stored.
doc-rst: FE_GET_EVENT: improve man-like format Parsing this file were causing lots of warnings with sphinx, due to the c function prototypes. Fix that by prepending them with .. c:function:: While here, use the same way we document man-like pages, at the V4L side of the book and add escapes to asterisks. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-04 23:39:49 +08:00
Return Value
------------
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
On success 0 is returned, on error -1 and the ``errno`` variable is set
appropriately. The generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.
.. flat-table::
:header-rows: 0
:stub-columns: 0
- .. row 1
doc-rst: linux_tv: Error codes should be const All error codes should be const. Most are, but there are lots of places where we forgot to add <constant> at the DocBook. Fix those via this small script: for i in $(git grep -lE "\s+E[A-Z]+\b" Documentation/linux_tv/); do perl -ne 's,([^\`])\b(E[A-Z]+)\b,\1``\2``,g; print $_' <$i >a && mv a $i; done As there are false positives, we needed to merge only the changes that make sense, skipping the c blocks and skipping things like EDID, EN, ETS that were also converted by the above code. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-03 22:53:09 +08:00
- ``EWOULDBLOCK``
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
- There is no event pending, and the device is in non-blocking mode.
- .. row 2
doc-rst: linux_tv: Error codes should be const All error codes should be const. Most are, but there are lots of places where we forgot to add <constant> at the DocBook. Fix those via this small script: for i in $(git grep -lE "\s+E[A-Z]+\b" Documentation/linux_tv/); do perl -ne 's,([^\`])\b(E[A-Z]+)\b,\1``\2``,g; print $_' <$i >a && mv a $i; done As there are false positives, we needed to merge only the changes that make sense, skipping the c blocks and skipping things like EDID, EN, ETS that were also converted by the above code. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-03 22:53:09 +08:00
- ``EOVERFLOW``
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
- Overflow in event queue - one or more events were lost.
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