hwclock: size optimizations
libbb/time.c: new file, introducing monotonic_us()
pscan, traceroute, arping: use it instead of gettimeofday
ping, zcip: TODO
function old new delta
monotonic_us - 89 +89
find_pair 164 180 +16
.rodata 129747 129763 +16
refresh 1144 1152 +8
............
timeout 8 4 -4
static.start 8 4 -4
last 8 4 -4
parse_conf 1303 1284 -19
time_main 1149 1124 -25
gettimeofday_us 39 - -39
arping_main 2042 1969 -73
hwclock_main 594 501 -93
catcher 485 380 -105
traceroute_main 4300 4117 -183
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 8/11 up/down: 157/-562) Total: -405 bytes
diff --git a/libbb/Config.in b/libbb/Config.in
index a1ff7c0..0a3769d 100644
--- a/libbb/Config.in
+++ b/libbb/Config.in
@@ -95,4 +95,14 @@
Setting this option allows for prompts to use things like \w and
\$ and escape codes.
+config MONOTONIC_SYSCALL
+ bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
+ default y
+ help
+ Use clock_gettime(CLOCK_MONOTONIC) syscall for measuring
+ time intervals (time, ping, traceroute etc need this).
+ Probably requires Linux 2.6+. If not selected, gettimeofday
+ will be used instead (which gives wrong results if date/time
+ is reset).
+
endmenu