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   sigaction    ( 2 )

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Примеры (Examples)

See mprotect(2).

   Probing for flag support
       The following example program exits with status EXIT_SUCCESS if
       SA_EXPOSE_TAGBITS is determined to be supported, and EXIT_FAILURE
       otherwise.

       #include <signal.h>
       #include <stdlib.h>
       #include <stdio.h>
       #include <unistd.h>

       void
       handler(int signo, siginfo_t *info, void *context)
       {
           struct sigaction oldact;

           if (sigaction(SIGSEGV, NULL, &oldact) == -1 ||
                   (oldact.sa_flags & SA_UNSUPPORTED) ||
                   !(oldact.sa_flags & SA_EXPOSE_TAGBITS)) {
               _exit(EXIT_FAILURE);
           }
           _exit(EXIT_SUCCESS);
       }

       int
       main(void)
       {
           struct sigaction act = { 0 };

           act.sa_flags = SA_SIGINFO | SA_UNSUPPORTED | SA_EXPOSE_TAGBITS;
           act.sa_sigaction = &handler;
           if (sigaction(SIGSEGV, &act, NULL) == -1) {
               perror("sigaction");
               exit(EXIT_FAILURE);
           }

           raise(SIGSEGV);
       }