Путеводитель по Руководству Linux
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   rt_sigaction    ( 2 )

изучить и изменить сигнальное действие (examine and change a signal action)
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Ошибки (баги) (Bugs)

When delivering a signal with a SA_SIGINFO handler, the kernel
       does not always provide meaningful values for all of the fields
       of the siginfo_t that are relevant for that signal.


       In kernels up to and including 2.6.13, specifying SA_NODEFER in
       sa_flags prevents not only the delivered signal from being masked
       during execution of the handler, but also the signals specified
       in sa_mask.  This bug was fixed in kernel 2.6.14.