49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
|
/*
|
||
|
|
* clock_nanosleep.c - clock_nanosleep() replacement
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef __APPLE__
|
||
|
|
|
||
|
|
#include "clock_nanosleep.h"
|
||
|
|
#include <errno.h> // for errno, EINVAL
|
||
|
|
#include <time.h> // for nanosleep, NULL
|
||
|
|
#include "../clock_gettime/clock_gettime.h" // for clock_gettime
|
||
|
|
|
||
|
|
int clock_nanosleep(clockid_t id, int flags, const struct timespec *ts,
|
||
|
|
struct timespec *ots) {
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (id != CLOCK_REALTIME)
|
||
|
|
return EINVAL;
|
||
|
|
|
||
|
|
if (flags & TIMER_ABSTIME) {
|
||
|
|
struct timespec mine;
|
||
|
|
|
||
|
|
if (clock_gettime(id, &mine))
|
||
|
|
return errno;
|
||
|
|
|
||
|
|
if (mine.tv_sec > ts->tv_sec)
|
||
|
|
return 0; // behind schedule
|
||
|
|
|
||
|
|
if (mine.tv_nsec > ts->tv_nsec) {
|
||
|
|
if (mine.tv_sec == ts->tv_sec)
|
||
|
|
return 0; // behind schedule too
|
||
|
|
|
||
|
|
mine.tv_nsec = 1000000000 + ts->tv_nsec - mine.tv_nsec;
|
||
|
|
mine.tv_sec++;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
mine.tv_nsec = ts->tv_nsec - mine.tv_nsec;
|
||
|
|
|
||
|
|
mine.tv_sec = ts->tv_sec - mine.tv_sec;
|
||
|
|
|
||
|
|
/* With TIMER_ABSTIME, clock_nanosleep ignores <ots> */
|
||
|
|
ret = nanosleep(&mine, NULL);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
ret = nanosleep(ts, ots);
|
||
|
|
|
||
|
|
return ret ? errno : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // __APPLE__
|