signals and blocking calls

[Tim Newsham]

Hi,

    I've noticed that there are some times when I cannot
get a signal delivered to a process.  For examle when I
am reading from a socket and the read blocks, signals seem to 
not get delivered (until the read unblocks).  If the
read blocks permanently, the program is unkillable
and unsignallable.  Is there anything I can do (short of
using a seperate thread or non-blocking I/O) to get
reliable signalling ? 

                                Tim N.

(I can provide example code if necessary).
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