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libbb: introduce and use msleep()

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function                                             old     new   delta
msleep                                                 -      45     +45
watchdog_main                                        271     266      -5
common_traceroute_main                              3546    3530     -16
beep_main                                            277     248     -29
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(add/remove: 1/0 grow/shrink: 0/3 up/down: 45/-50)             Total: -5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2020-11-29 12:40:25 +01:00
parent b86a9ed699
commit 6a55b4e403
5 changed files with 20 additions and 6 deletions
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15
libbb/bb_do_delay.c
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@@ -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);
}