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manual: SA_ONSTACK is ignored without alternate stack
The current stack is used. No SIGILL is generated.
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@ -1329,7 +1329,7 @@ Setting this flag for a signal other than @code{SIGCHLD} has no effect.
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If this flag is set for a particular signal number, the system uses the
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signal stack when delivering that kind of signal. @xref{Signal Stack}.
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If a signal with this flag arrives and you have not set a signal stack,
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the system terminates the program with @code{SIGILL}.
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the normal user stack is used instead, as if the flag had not been set.
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@end deftypevr
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@deftypevr Macro int SA_RESTART
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