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   sigaction    ( 2 )

изучить и изменить сигнальное действие (examine and change a signal action)
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Синопсис (Synopsis)

#include <signal.h>


       int sigaction(int signum, const struct sigaction *restrict act,
                     struct sigaction *restrict oldact);


   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):


       sigaction():
           _POSIX_C_SOURCE


       siginfo_t:
           _POSIX_C_SOURCE >= 199309L