Time Out an Exec Call

I am using exec() to run a number of StarOS tests on multiple IP's
(they test various aspects of router and server functions). The
problem I have is that an invalid IP may cause a delay of a few
minutes in the execution of the script. I cannot use ping to test the
validity of an IP since ping may be blocked.

Is there a way to stop the execution of a loop if, after a few
seconds, there is no response from the server? I would guess that the
exec() would have to be called from inside of some sort of timer,
though the solution escapes me.

TIA!


.

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