dump1090/compat/clock_nanosleep/clock_nanosleep.c
Oliver Jowett 1c80d1b784 OS X compatibility cleanups.
Reattach the licenses for the compat stuff to the source.
Only build/link the compat stuff when it's needed.
Rename compat/util.h so it's not confused with util.h.
Move all the platform specific defines inside compat/compat.h.
2015-09-07 12:58:49 +01:00

63 lines
2.3 KiB
C

/*
* clock_nanosleep.c - clock_nanosleep() replacement
*/
/***********************************************************************
* Copyright © 2006 Rémi Denis-Courmont. *
* This program is free software; you can redistribute and/or modify *
* it under the terms of the GNU General Public License as published *
* by the Free Software Foundation; version 2 of the license, or (at *
* your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, you can get it from: *
* http://www.gnu.org/copyleft/gpl.html *
***********************************************************************/
#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;
}