Using alarm() to break out of socket accept

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Hope somebody can help here:

We have code that uses an alarm() to routinely break ouf of a socket accept
and then perform some processing (check a flag) and then loop back around
to wait for a connection again. The code works fine on Solaris, HP-UX,,
AIX, and other flavours but not on RedHat 6.0.

I noticed that by default, SIGALRM is ignored so I unblocked it with
sigprocmask but we are still not getting the behaviour we require.

Is there something I am missing here?

Thanks

Adrian

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