libbb: introduce and use xgettimeofday(), do not truncate 64-bit time_t in shells

function                                             old     new   delta
xgettimeofday                                          -      11     +11
get_local_var_value                                  280     281      +1
svlogd_main                                         1323    1322      -1
change_epoch                                          67      66      -1
timestamp_and_log                                    461     458      -3
hwclock_main                                         301     298      -3
fmt_time_bernstein_25                                135     132      -3
step_time                                            331     326      -5
script_main                                         1207    1202      -5
machtime                                              34      28      -6
curtime                                               61      54      -7
ts_main                                              423     415      -8
nmeter_main                                          761     751     -10
gettime1900d                                          67      46     -21
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/12 up/down: 12/-73)           Total: -61 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 14 insertions, 3 deletions

diff --git a/libbb/time.c b/libbb/time.c
index 74a69eefb..cf5f2e5c8 100644
--- a/libbb/time.c
+++ b/libbb/time.c
@@ -291,19 +291,19 @@ unsigned FAST_FUNC monotonic_sec(void)
 unsigned long long FAST_FUNC monotonic_ns(void)
 {
         struct timeval tv;
-        gettimeofday(&tv, NULL);
+        xgettimeofday(&tv);
         return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
 }
 unsigned long long FAST_FUNC monotonic_us(void)
 {
         struct timeval tv;
-        gettimeofday(&tv, NULL);
+        xgettimeofday(&tv);
         return tv.tv_sec * 1000000ULL + tv.tv_usec;
 }
 unsigned long long FAST_FUNC monotonic_ms(void)
 {
         struct timeval tv;
-        gettimeofday(&tv, NULL);
+        xgettimeofday(&tv);
         return tv.tv_sec * 1000ULL + tv.tv_usec / 1000;
 }
 unsigned FAST_FUNC monotonic_sec(void)
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index aea995a5c..99596b9d0 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -720,3 +720,14 @@ void FAST_FUNC xsettimeofday(const struct timeval *tv)
         if (settimeofday(tv, NULL))
                 bb_simple_perror_msg_and_die("settimeofday");
 }
+
+void FAST_FUNC xgettimeofday(struct timeval *tv)
+{
+#if 0
+        if (gettimeofday(tv, NULL))
+                bb_simple_perror_msg_and_die("gettimeofday");
+#else
+        /* Never fails on Linux */
+        gettimeofday(tv, NULL);
+#endif
+}