libbb: introduse and use signal_[no_]SA_RESTART_empty_mask and sigaction_set

signal_SA_RESTART_empty_mask                           -      65     +65
signal_no_SA_RESTART_empty_mask                        -      54     +54
dd_main                                             1325    1369     +44
sigaction_set                                          -      19     +19
dname_enc                                            373     377      +4
UNSPEC_print                                          64      66      +2
setsignal                                            296     294      -2
bb_signals_recursive                                  95      92      -3
bb_askpass                                           367     361      -6
inetd_main                                          1810    1797     -13
rx_main                                              912     883     -29
sigdelset                                             32       -     -32
__sigdelset                                           32       -     -32
__GI_sigdelset                                        32       -     -32
sighup_handler                                        84      37     -47
arping_main                                         1844    1797     -47
fsck_main                                           1869    1807     -62
run_list                                            1917    1844     -73
vlock_main                                           492     409     -83
progressmeter                                        883     798     -85
handle_incoming_and_exit                            2737    2651     -86
------------------------------------------------------------------------------
(add/remove: 3/3 grow/shrink: 3/12 up/down: 188/-632)        Total: -444 bytes

1 files changed, 2 insertions, 12 deletions

diff --git a/networking/arping.c b/networking/arping.c
index c89b97567..2277ec55e 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -377,18 +377,8 @@ int arping_main(int argc, char **argv)
                 printf(" from %s via %s\n", inet_ntoa(src), device);
         }
 
-        {
-                struct sigaction sa;
-
-                memset(&sa, 0, sizeof(sa));
-                sa.sa_flags = SA_RESTART;
-
-                sa.sa_handler = (void (*)(int)) finish;
-                sigaction(SIGINT, &sa, NULL);
-
-                sa.sa_handler = (void (*)(int)) catcher;
-                sigaction(SIGALRM, &sa, NULL);
-        }
+        signal_SA_RESTART_empty_mask(SIGINT,  (void (*)(int))finish);
+        signal_SA_RESTART_empty_mask(SIGALRM, (void (*)(int))catcher);
 
         catcher();