libbb: use a wrapper around sysconf(_SC_CLK_TCK) to save a few bytes

function                                             old     new   delta
bb_sc_clk_tck                                          -      10     +10
timescmd                                             118     113      -5
print_route                                         1763    1758      -5
mpstat_main                                         1288    1283      -5
iostat_main                                         1947    1942      -5
INET_setroute                                        879     871      -8
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/5 up/down: 10/-28)            Total: -18 bytes
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

7 files changed, 12 insertions, 16 deletions

diff --git a/include/libbb.h b/include/libbb.h
index fa69a7fe6..7a3610bb9 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -738,6 +738,7 @@ unsigned bb_arg_max(void) FAST_FUNC;
 #else
 # define bb_arg_max() ((unsigned)(32 * 1024))
 #endif
+unsigned bb_clk_tck(void) FAST_FUNC;
 
 #define SEAMLESS_COMPRESSION (0 \
  || ENABLE_FEATURE_SEAMLESS_XZ \
diff --git a/libbb/sysconf.c b/libbb/sysconf.c
index c5fa5e001..4dbffbebd 100644
--- a/libbb/sysconf.c
+++ b/libbb/sysconf.c
@@ -14,3 +14,9 @@ unsigned FAST_FUNC bb_arg_max(void)
         return sysconf(_SC_ARG_MAX);
 }
 #endif
+
+/* Return the number of clock ticks per second. */
+unsigned FAST_FUNC bb_clk_tck(void)
+{
+        return sysconf(_SC_CLK_TCK);
+}
diff --git a/networking/libiproute/iproute.c b/networking/libiproute/iproute.c
index f8a67d9ee..ec4d8ba03 100644
--- a/networking/libiproute/iproute.c
+++ b/networking/libiproute/iproute.c
@@ -73,7 +73,7 @@ static unsigned get_hz(void)
                 fclose(fp);
         }
         if (!hz_internal)
-                hz_internal = sysconf(_SC_CLK_TCK);
+                hz_internal = bb_clk_tck();
         return hz_internal;
 }
 
diff --git a/networking/route.c b/networking/route.c
index 4235ea72c..24cc2eb5a 100644
--- a/networking/route.c
+++ b/networking/route.c
@@ -283,7 +283,7 @@ static NOINLINE void INET_setroute(int action, char **args)
                 if (k == KW_IPVx_IRTT) {
                         rt->rt_flags |= RTF_IRTT;
                         rt->rt_irtt = xatoul(args_m1);
-                        rt->rt_irtt *= (sysconf(_SC_CLK_TCK) / 100);    /* FIXME */
+                        rt->rt_irtt *= (bb_clk_tck() / 100);    /* FIXME */
 #if 0                                   /* FIXME: do we need to check anything of this? */
                         if (rt->rt_irtt < 1 || rt->rt_irtt > (120 * HZ)) {
                                 bb_error_msg_and_die("bad irtt");
diff --git a/procps/iostat.c b/procps/iostat.c
index 978d23430..8d272c87c 100644
--- a/procps/iostat.c
+++ b/procps/iostat.c
@@ -109,11 +109,6 @@ enum {
         OPT_m = 1 << 5,
 };
 
-static ALWAYS_INLINE unsigned get_user_hz(void)
-{
-        return sysconf(_SC_CLK_TCK);
-}
-
 static ALWAYS_INLINE int this_is_smp(void)
 {
         return (G.total_cpus > 1);
@@ -414,7 +409,7 @@ int iostat_main(int argc UNUSED_PARAM, char **argv)
         memset(&stats_data, 0, sizeof(stats_data));
 
         /* Get number of clock ticks per sec */
-        G.clk_tck = get_user_hz();
+        G.clk_tck = bb_clk_tck();
 
         /* Determine number of CPUs */
         G.total_cpus = get_cpu_count();
diff --git a/procps/mpstat.c b/procps/mpstat.c
index aa5a5c73f..c628d6215 100644
--- a/procps/mpstat.c
+++ b/procps/mpstat.c
@@ -775,12 +775,6 @@ static void main_loop(void)
 
 /* Initialization */
 
-/* Get number of clock ticks per sec */
-static ALWAYS_INLINE unsigned get_hz(void)
-{
-        return sysconf(_SC_CLK_TCK);
-}
-
 static void alloc_struct(int cpus)
 {
         int i;
@@ -873,7 +867,7 @@ int mpstat_main(int UNUSED_PARAM argc, char **argv)
         G.cpu_nr = get_cpu_count();
 
         /* Get number of clock ticks per sec */
-        G.hz = get_hz();
+        G.hz = bb_clk_tck();
 
         /* Calculate number of interrupts per processor */
         G.irqcpu_nr = get_irqcpu_nr(PROCFS_INTERRUPTS, NR_IRQS) + NR_IRQCPU_PREALLOC;
diff --git a/shell/ash.c b/shell/ash.c
index cabeb40c5..dc7a9bf4f 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -12759,7 +12759,7 @@ timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
         const unsigned char *p;
         struct tms buf;
 
-        clk_tck = sysconf(_SC_CLK_TCK);
+        clk_tck = bb_clk_tck();
         times(&buf);
 
         p = timescmd_str;