Путеводитель по Руководству Linux
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   rt_sigaction    ( 2 )

изучить и изменить сигнальное действие (examine and change a signal action)
  Name  |  Synopsis  |  Description  |  Return value  |    Error    |  Conforming to  |  Note  |  Bugs  |  Examples  |  See also  |

Ошибки (Error)

EFAULT act or oldact points to memory which is not a valid part of the process address space.

EINVAL An invalid signal was specified. This will also be generated if an attempt is made to change the action for SIGKILL or SIGSTOP, which cannot be caught or ignored.