[Spice-devel] [xf86-video-qxl v5] Enable smartcard support for XSpice.

[Uri Lublin]

On 12/15/2014 09:04 PM, Jeremy White wrote:
>
>> Maybe retry immediately for EINTR:
>>
>> do {
>>     rc = read()
>> } while (! ((rc == -1) && (errno == EINTR)))
>>
>> and remove "|| errno == EINTR" below.
>
> Can you explain why?  I imagine that the EINTR case should be quite 
> rare, and that in those cases, it would return into the regular 
> channel handling, where it will be flagged as readable, and eventually 
> return.

Unlike e.g. EAGAIN, the data to read is available.
The idea is doing the read immediately instead of eventually.
This may be a premature optimization.