HP-UX Reference (11i v1 05/09) - 2 System Calls (vol 5)

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sigaltstack(2) sigaltstack(2)
On some implementations, stack space is automatically extended as needed. On those implementations,
automatic extension is typically not available for an alternate stack. If the stack overflows, the behavior is
undefined.
Threads Considerations
Each thread may define an alternate signal handling stack.
LWP (Light Weight Processes) Considerations
Each LWP may define an alternate signal handling stack.
SEE ALSO
sigaction(2), setjmp(3C), <signal.h>.
CHANGE HISTORY
First released in Issue 4, Version 2.
Section 2−−364 Hewlett-Packard Company − 2 − HP-UX 11i Version 1: September 2005