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| author | Denys Vlasenko | 2020-11-29 12:40:25 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2020-11-29 12:40:25 +0100 |
| commit | 6a55b4e403979ba299261816a7ec1bb55bbf3f2b (patch) | |
| tree | d8eba6a7c1483c33547549b07081e9549baa094c /libbb/bb_do_delay.c | |
| parent | b86a9ed699e2c4693167d6ead00ac307bd9c01c6 (diff) | |
| download | busybox-6a55b4e403979ba299261816a7ec1bb55bbf3f2b.zip busybox-6a55b4e403979ba299261816a7ec1bb55bbf3f2b.tar.gz | |
libbb: introduce and use msleep()
function old new delta
msleep - 45 +45
watchdog_main 271 266 -5
common_traceroute_main 3546 3530 -16
beep_main 277 248 -29
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/3 up/down: 45/-50) Total: -5 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/bb_do_delay.c')
| -rw-r--r-- | libbb/bb_do_delay.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/libbb/bb_do_delay.c b/libbb/bb_do_delay.c index 3a86dc2..3dbf032 100644 --- a/libbb/bb_do_delay.c +++ b/libbb/bb_do_delay.c @@ -8,7 +8,7 @@ */ #include "libbb.h" -/* void FAST_FUNC bb_do_delay(int seconds) { ... } - no users yet */ +/* void FAST_FUNC bb_do_delay(unsigned seconds) { ... } - no users yet */ #ifndef LOGIN_FAIL_DELAY #define LOGIN_FAIL_DELAY 3 @@ -34,3 +34,16 @@ void FAST_FUNC sleep1(void) sleep(1); } +void FAST_FUNC msleep(unsigned ms) +{ + /* 1. usleep(n) is not guaranteed by standards to accept n >= 1000000 + * 2. multiplication in usleep(ms * 1000) can overflow if ms > 4294967 + * (sleep of ~71.5 minutes) + * Let's play safe and loop: + */ + while (ms > 500) { + usleep(500000); + ms -= 500; + } + usleep(ms * 1000); +} |