bear24rw schrieb:
> Hi,
>
> I'm working on a project and i am using all three serial ports of my
> 7260. Right now I am parsing a GPS on ttyAM1 but it is not
> non-blocking. I know how to set it up to be non-blocking but i also
> wanted to set it up with a signal handler. My question is how do i set
> up a signal handler for each port.
> The example code i'm looking at set the handler like this
>
> saio.sa_handler = signal_handler_IO;
>
> but how would i set one up for each specific port...
>
You can only have one SIGIO handler, so it has to find out for itself
what exactly caused it to be called. LDD3 (http://lwn.net/Kernel/LDD3/;
Ch.6) says this:
"There is one remaining problem with input notification. When a process
receives a SIGIO, it doesnât know which input file has new input to
offer. If more than one file is enabled to asynchronously notify the
process of pending input, the application must still resort to poll or
select to find out what happened."
Oliver
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