[linux-dvb] Two more DVB CA IOCTL questions

[Andrew de Quincey <adq_dvb@lidskialf.net>]

A couple more DVB CA IOCTL questions have occurred to me, and need cleared up:

1) Should the CA_GET_MSG and CA_SEND_MSG ioctls block? Currently the 
read()/write() interface blocks if there isn't any data/enough buffer space 
for the message. My feeling is no, and I should return -EAGAIN (or 
equivalent) for the IOCTLs.


2) Should CA_GET_MSG receive from ANY slot/connection (i.e. overwrite any user 
passed parameters), or should it only receive from the slot/connection 
supplied in the sructure.

I ask this because the read() interface just returns packets from all 
slots/connections. My feeling is it should be possible to select, but also to 
specify ANY (e.g. pass -1 for either parameter). In this case, the 
parameter(s) in the ca_msg_t structure will be overwritten with the 
appropriate value. This kind of filtering is very easy with the kernel data 
structures I've defined.


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