aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/Documentation/userspace-api/media/dvb/fe-get-event.rst
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/userspace-api/media/dvb/fe-get-event.rst')
-rw-r--r--Documentation/userspace-api/media/dvb/fe-get-event.rst78
1 files changed, 78 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/dvb/fe-get-event.rst b/Documentation/userspace-api/media/dvb/fe-get-event.rst
new file mode 100644
index 000000000000..19df41dca238
--- /dev/null
+++ b/Documentation/userspace-api/media/dvb/fe-get-event.rst
@@ -0,0 +1,78 @@
+.. Permission is granted to copy, distribute and/or modify this
+.. document under the terms of the GNU Free Documentation License,
+.. Version 1.1 or any later version published by the Free Software
+.. Foundation, with no Invariant Sections, no Front-Cover Texts
+.. and no Back-Cover Texts. A copy of the license is included at
+.. Documentation/userspace-api/media/fdl-appendix.rst.
+..
+.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
+
+.. _FE_GET_EVENT:
+
+************
+FE_GET_EVENT
+************
+
+Name
+====
+
+FE_GET_EVENT
+
+.. attention:: This ioctl is deprecated.
+
+
+Synopsis
+========
+
+.. c:function:: int ioctl(int fd, FE_GET_EVENT, struct dvb_frontend_event *ev)
+ :name: FE_GET_EVENT
+
+
+Arguments
+=========
+
+``fd``
+ File descriptor returned by :c:func:`open() <dvb-fe-open>`.
+
+``ev``
+ Points to the location where the event, if any, is to be stored.
+
+
+Description
+===========
+
+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
+with errno set to ``EWOULDBLOCK``. In the former case, the call blocks until
+an event becomes available.
+
+
+Return Value
+============
+
+On success 0 is returned.
+
+On error -1 is returned, and the ``errno`` variable is set
+appropriately.
+
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+
+
+ - .. row 1
+
+ - ``EWOULDBLOCK``
+
+ - There is no event pending, and the device is in non-blocking mode.
+
+ - .. row 2
+
+ - ``EOVERFLOW``
+
+ - Overflow in event queue - one or more events were lost.
+
+Generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.