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libbb: provide usleep() fallback implementation

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POSIX.1-2008 removed the usleep function, provide a fallback
implementaion using the recommended nanosleep().

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Bernhard Reutner-Fischer 2014-04-13 16:37:57 +02:00 • committed by Denys Vlasenko
parent 69b114fb8a
commit ad16741ccd
2 changed files with 32 additions and 2 deletions
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18
libbb/platform.c
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@ -17,6 +17,24 @@ char* FAST_FUNC strchrnul(const char *s, int c)
}
#endif
#ifndef HAVE_USLEEP
int FAST_FUNC usleep(unsigned usec)
{
struct timespec ts;
ts.tv_sec = usec / 1000000u;
ts.tv_nsec = (usec % 1000000u) * 1000u;
/*
* If a signal has non-default handler, nanosleep returns early.
* Our version of usleep doesn't return early
* if interrupted by such signals:
*
*/
while (nanosleep(&ts, &ts) != 0)
continue;
return 0;
}
#endif
#ifndef HAVE_VASPRINTF
int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
{