going to call the subroutine call right then and there! Best to be sure
and quote it or take a reference to it. *Plumber works too. See L<perlsub>.
+If your system has the sigaction() function then signal handlers are
+installed using it. This means you get reliable signal handling. If
+your system has the SA_RESTART flag it is used when signals handlers are
+installed. This means that system calls for which it is supported
+continue rather than returning when a signal arrives. If you want your
+system calls to be interrupted by signal delivery then do something like
+this:
+
+ use POSIX ':signal_h';
+
+ my $alarm = 0;
+ sigaction SIGALRM, new POSIX::SigAction sub { $alarm = 1 }
+ or die "Error setting SIGALRM handler: $!\n";
+
+See L<POSIX>.
+
Certain internal hooks can be also set using the %SIG hash. The
routine indicated by C<$SIG{__WARN__}> is called when a warning message is
about to be printed. The warning message is passed as the first