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, 13 deletions

diff --git a/networking/httpd.c b/networking/httpd.c
index e9137287c..7b7446ed9 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -1788,7 +1788,6 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
         char *header_ptr = header_ptr;
         Htaccess_Proxy *proxy_entry;
 #endif
-        struct sigaction sa;
 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
         int credentials = -1;  /* if not required this is Ok */
 #endif
@@ -1819,11 +1818,7 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
         }
 
         /* Install timeout handler */
-        memset(&sa, 0, sizeof(sa));
-        sa.sa_handler = exit_on_signal;
-        /* sigemptyset(&sa.sa_mask); - memset should be enough */
-        /*sa.sa_flags = 0; - no SA_RESTART */
-        sigaction(SIGALRM, &sa, NULL);
+        signal_no_SA_RESTART_empty_mask(SIGALRM, exit_on_signal);
         alarm(HEADER_READ_TIMEOUT);
 
         if (!get_line()) /* EOF or error or empty line */
@@ -2247,15 +2242,9 @@ static void mini_httpd_inetd(void)
 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
 static void sighup_handler(int sig)
 {
-        struct sigaction sa;
-
         parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
 
-        memset(&sa, 0, sizeof(sa));
-        sa.sa_handler = sighup_handler;
-        /*sigemptyset(&sa.sa_mask); - memset should be enough */
-        sa.sa_flags = SA_RESTART;
-        sigaction(SIGHUP, &sa, NULL);
+        signal_SA_RESTART_empty_mask(SIGHUP, sighup_handler);
 }
 #endif