Путеводитель по Руководству Linux
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   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.