diff options
Diffstat (limited to 'Documentation/userspace-api/media/dvb/ca-get-msg.rst')
| -rw-r--r-- | Documentation/userspace-api/media/dvb/ca-get-msg.rst | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/dvb/ca-get-msg.rst b/Documentation/userspace-api/media/dvb/ca-get-msg.rst new file mode 100644 index 000000000000..995f461d6879 --- /dev/null +++ b/Documentation/userspace-api/media/dvb/ca-get-msg.rst @@ -0,0 +1,59 @@ +.. 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 + +.. _CA_GET_MSG: + +========== +CA_GET_MSG +========== + +Name +---- + +CA_GET_MSG + + +Synopsis +-------- + +.. c:function:: int ioctl(fd, CA_GET_MSG, struct ca_msg *msg) + :name: CA_GET_MSG + + +Arguments +--------- + +``fd`` + File descriptor returned by a previous call to :c:func:`open() <dvb-ca-open>`. + +``msg`` + Pointer to struct :c:type:`ca_msg`. + +Description +----------- + +Receives a message via a CI CA module. + +.. note:: + + Please notice that, on most drivers, this is done by reading from + the /dev/adapter?/ca? device node. + + +Return Value +------------ + + +On success 0 is returned. + +On error -1 is returned, and the ``errno`` variable is set +appropriately. + +Generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. |