[quoting order normalized -dM]

>>> Is there a way/system call available for user land code to find out
>>> if it is running from a signal handler or not ?
>> Yes, by setting up your handler routine to record this information.
> Thanks, I guess....
> but let's say I'm a library and being called from someone else's
> signal handling routine ?

I haven't been able to think of any, short of walking back up your call
stack and looking for a signal tranpoline signature.

Why do you care?  There may be a better way to solve the underlying
problem.

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