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       The siginfo_t parameter to sa_sigaction is a struct with the fo
+llowing elements

              siginfo_t {
...
                  int      si_band;   /* Band event */
                  int      si_fd;     /* File descriptor */
              }

use POSIX;
sub hup {
    print "hup(@_)\n";
...
sigaction(SIGHUP, $newaction);
print "I am $$\n";
kill HUP, $$;