On 13 Aug 1998 19:05:31 +0200, Magnus Ahltorp <map@stacken.kth.se> said:
>> A possible solution could be extending of the SIGIO concept in the
>> following way:
>>
>> - SIGIO handler gets an extra parameter containing the FD
>> in being reported.
Already done. :)
> I received this reply from Johnny Eriksson <bygg@swip.net>:
> Implement a new set of signals, one for each possible file.
Yikes. 30,000 signal handlers in place at once?!
In 2.1.117, there is a new fcntl function, F_SETSIG (and a corresponding
F_GETSIG). This lets you specify a signal number to be delivered in
place of SIGIO if async IO arrives. The best part is that if you
specify the number of a POSIX realtime signal, then the signal gets
queued with the fd number as an argument to the signal handler.
Right now you need to be using glibc-2.1 to take full advantage of the
posix realtime stuff, but the kernel mechanism is all there.
--Stephen
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