Mail Archives: cygwin/2010/04/29/09:29:29
On 29.04.2010 13:28, Matthias Andree wrote:
> Am 29.04.2010 12:53, schrieb Thomas Wolff:
>
> [on closed terminal]
>
>> On Linux, select() indicates an exception and EIO.
>> On SunOS, select() indicates both an exception and input (weird),
>>
> Not weird, you appear to be misunderstanding select().
> An IEEE Std 1003.1 compliant select():
>
> - only states that a subsequent read() will *not block*
> this includes EOF and error, as they make read() return without blocking)
>
> - makes *no statements about success*
>
Oh, right, so apparently Linux is wrong here (since it does not report
read availability...).
>> On Cygwin, the following is observed:
>> * EOF is not signalled on read(); rather EIO is indicated right away.
>> (Maybe not too bad, an application can handle that as well.)
>> * select() with timeout hangs.
>>
>> Especially the latter can hardly be handled by an application.
>>
> Pointers for workarounds: alarm(), signal().
>
So I could setup alarm() to get myself signal()ed while waiting in a
long sleep().
But the granularity is in seconds only, so this is not a substitute for
most use cases typically handled by calling select().
Thanks for the information anyway.
------
Thomas
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