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

3 files changed, 81 insertions, 42 deletions

diff --git a/libbb/Kbuild b/libbb/Kbuild
index 2fb1b2420..515368de7 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -78,6 +78,7 @@ lib-y += safe_strncpy.o
 lib-y += safe_write.o
 lib-y += setup_environment.o
 lib-y += sha1.o
+lib-y += signals.o
 lib-y += simplify_path.o
 lib-y += skip_whitespace.o
 lib-y += speed_table.o
diff --git a/libbb/signals.c b/libbb/signals.c
new file mode 100644
index 000000000..f7e4908e7
--- /dev/null
+++ b/libbb/signals.c
@@ -0,0 +1,80 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2006 Rob Landley
+ * Copyright (C) 2006 Denis Vlasenko
+ *
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+void bb_signals(int sigs, void (*f)(int))
+{
+        int sig_no = 0;
+        int bit = 1;
+
+        while (sigs) {
+                if (sigs & bit) {
+                        sigs &= ~bit;
+                        signal(sig_no, f);
+                }
+                sig_no++;
+                bit <<= 1;
+        }
+}
+
+void bb_signals_recursive(int sigs, void (*f)(int))
+{
+        int sig_no = 0;
+        int bit = 1;
+        struct sigaction sa;
+
+        memset(&sa, 0, sizeof(sa));
+        sa.sa_handler = f;
+        /*sa.sa_flags = 0;*/
+        /*sigemptyset(&sa.sa_mask); - hope memset did it*/
+
+        while (sigs) {
+                if (sigs & bit) {
+                        sigs &= ~bit;
+                        sigaction(sig_no, &sa, NULL);
+                }
+                sig_no++;
+                bit <<= 1;
+        }
+}
+
+void sig_block(int sig)
+{
+        sigset_t ss;
+        sigemptyset(&ss);
+        sigaddset(&ss, sig);
+        sigprocmask(SIG_BLOCK, &ss, NULL);
+}
+
+void sig_unblock(int sig)
+{
+        sigset_t ss;
+        sigemptyset(&ss);
+        sigaddset(&ss, sig);
+        sigprocmask(SIG_UNBLOCK, &ss, NULL);
+}
+
+#if 0
+void sig_blocknone(void)
+{
+        sigset_t ss;
+        sigemptyset(&ss);
+        sigprocmask(SIG_SETMASK, &ss, NULL);
+}
+#endif
+
+void sig_pause(void)
+{
+        sigset_t ss;
+        sigemptyset(&ss);
+        sigsuspend(&ss);
+}
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 445e07717..8dd414d6a 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -234,48 +234,6 @@ void xfflush_stdout(void)
         }
 }
 
-void sig_block(int sig)
-{
-        sigset_t ss;
-        sigemptyset(&ss);
-        sigaddset(&ss, sig);
-        sigprocmask(SIG_BLOCK, &ss, NULL);
-}
-
-void sig_unblock(int sig)
-{
-        sigset_t ss;
-        sigemptyset(&ss);
-        sigaddset(&ss, sig);
-        sigprocmask(SIG_UNBLOCK, &ss, NULL);
-}
-
-#if 0
-void sig_blocknone(void)
-{
-        sigset_t ss;
-        sigemptyset(&ss);
-        sigprocmask(SIG_SETMASK, &ss, NULL);
-}
-#endif
-
-void sig_catch(int sig, void (*f)(int))
-{
-        struct sigaction sa;
-        sa.sa_handler = f;
-        sa.sa_flags = 0;
-        sigemptyset(&sa.sa_mask);
-        sigaction(sig, &sa, NULL);
-}
-
-void sig_pause(void)
-{
-        sigset_t ss;
-        sigemptyset(&ss);
-        sigsuspend(&ss);
-}
-
-
 void xsetenv(const char *key, const char *value)
 {
         if (setenv(key, value, 1))