Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

System Functions (s and S) sigaction(2)
HP does not support the Realtime Signals Extension. The errno value [ENOTSUP] is not
returned.
HP maintains only one alternate signal stack per process for unbound threads. If an alternate sig-
nal stack is registered, this alternate signal stack applies to all threads in the process. Note that
this alternate signal stack behavior does not apply to bound threads.
The use of this function with the POSIX User Thread Model library conforms to the following
industry standards:
• IEEE Std 1003.1-2004, POSIX System Application Program Interface
This function does not conform to the async-signal safe requirement of the POSIX.1 standard.
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