Thanks a lot for all these remarks! Here under I try to address each of the suggestions that have been made:

• used FASYNC instead of O_ASYNC: no change (they are, as far as I can see synomins anyway on my Linux system.
• set the line to O_NOCTTY|O_NONBLOCK:could'nt see any change
• use select. May be I dont understand this properly, but I cant see why it would help: using select would still require the script to constantly poll the port for any new input (?).

Otherwise concerning the while loop.. it would be nice to use pause but since I cannot catch the signal in the first place.. I wanted to make the script as straight forward as possible (focus on the SIGIO and nothing else)

Any further ideas/recommendations? Lets say I wan to dial into my computer, and I want a small perl script to handle this: do I have to constantly poll the Serial Port for input from the modem (every 5 or 10 secs.) and "suck" the system ressources (whith a "while loop" ;-)? Or is there another way of doing this in Perl?

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