From 6a55b4e403979ba299261816a7ec1bb55bbf3f2b Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sun, 29 Nov 2020 12:40:25 +0100 Subject: 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 --- libbb/bb_do_delay.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'libbb/bb_do_delay.c') diff --git a/libbb/bb_do_delay.c b/libbb/bb_do_delay.c index 3a86dc2ae..3dbf032db 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); +} -- cgit v1.2.3