wget: use monotonic_sec instead of gettimeofday

zcip: use monotonic_us instead of gettimeofday
udhcpcd: simpler, shorter random_xid()

function                                             old     new   delta
monotonic_sec                                          -      41     +41
find_pair                                            164     180     +16
run_list_real                                       2018    2028     +10
cmp_main                                             547     555      +8
collect_ctx                                          112     119      +7
singlemount                                         4544    4549      +5
time_main                                           1124    1128      +4
static.start_sec                                       -       4      +4
static.lastupdate_sec                                  -       4      +4
sock                                                   -       4      +4
read_package_field                                   253     257      +4
pick                                                  38      40      +2
get_next_line                                        145     147      +2
count_lines                                           59      61      +2
process_stdin                                        435     433      -2
xstrtoul_range_sfx                                   229     226      -3
static.initialized                                     4       1      -3
dhcprelay_main                                      1125    1122      -3
catcher                                              380     377      -3
arping_main                                         1969    1966      -3
s                                                      8       4      -4
cfg                                                    4       -      -4
static.lastupdate                                      8       -      -8
start                                                  8       -      -8
random_xid                                            95      33     -62
.rodata                                           129114  129050     -64
zcip_main                                           1731    1576    -155
progressmeter                                       1035     867    -168
------------------------------------------------------------------------------
(add/remove: 4/3 grow/shrink: 10/11 up/down: 113/-490)       Total: -377 bytes

1 files changed, 13 insertions, 2 deletions

diff --git a/libbb/time.c b/libbb/time.c
index f2a741521..3e35542f3 100644
--- a/libbb/time.c
+++ b/libbb/time.c
@@ -21,12 +21,23 @@ unsigned long long monotonic_us(void)
                 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
         return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
 }
+unsigned monotonic_sec(void)
+{
+        struct timespec ts;
+        if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts))
+                bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
+        return ts.tv_sec;
+}
 #else
 unsigned long long monotonic_us(void)
 {
         struct timeval tv;
-        if (gettimeofday(&tv, NULL))
-                bb_error_msg_and_die("gettimeofday failed");
+        gettimeofday(&tv, NULL);
         return tv.tv_sec * 1000000ULL + tv_usec;
 }
+
+unsigned monotonic_sec(void)
+{
+        return time(NULL);
+}
 #endif