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, 2 insertions, 2 deletions

diff --git a/coreutils/tee.c b/coreutils/tee.c
index 13fb4a3c1..b38801755 100644
--- a/coreutils/tee.c
+++ b/coreutils/tee.c
@@ -36,12 +36,12 @@ int tee_main(int argc, char **argv)
         mode += (retval & 2);   /* Since 'a' is the 2nd option... */
 
         if (retval & 1) {
-                signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */
+                signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
         }
         retval = EXIT_SUCCESS;
         /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
          * that doesn't consume all its input.  Good idea... */
-        signal(SIGPIPE, SIG_IGN);       /* TODO - switch to sigaction. */
+        signal(SIGPIPE, SIG_IGN);
 
         /* Allocate an array of FILE *'s, with one extra for a sentinal. */
         fp = files = xzalloc(sizeof(FILE *) * (argc + 2));