libbb: introduce bb_signals and bb_signals_recursive,

which sets same handler for many signals. sig_catch is nuked
(bb_signals_recursive is more descriptive name).
*: use them as appropriate. 

function                                             old     new   delta
bb_signals_recursive                                   -      95     +95
bb_signals                                             -      52     +52
run_command                                          258     273     +15
svlogd_main                                         1368    1377      +9
runsv_main                                          1746    1752      +6
runsvdir_main                                       1643    1646      +3
UNSPEC_print                                          64      66      +2
time_main                                           1128    1127      -1
...
resize_main                                          246     210     -36
sig_catch                                             63       -     -63
set_fatal_sighandler                                  85      14     -71
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 5/24 up/down: 182/-548)        Total: -366 bytes

1 files changed, 5 insertions, 3 deletions

diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c
index 457f38103..c6e057138 100644
--- a/sysklogd/syslogd.c
+++ b/sysklogd/syslogd.c
@@ -540,9 +540,11 @@ static void do_syslogd(void)
         int sock_fd;
 
         /* Set up signal handlers */
-        signal(SIGINT, quit_signal);
-        signal(SIGTERM, quit_signal);
-        signal(SIGQUIT, quit_signal);
+        bb_signals(0
+                + (1 << SIGINT)
+                + (1 << SIGTERM)
+                + (1 << SIGQUIT)
+                , quit_signal);
         signal(SIGHUP, SIG_IGN);
         /* signal(SIGCHLD, SIG_IGN); - why? */
 #ifdef SYSLOGD_MARK