1c80d1b784
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.
63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
/*
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* clock_nanosleep.c - clock_nanosleep() replacement
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*/
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/***********************************************************************
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* Copyright © 2006 Rémi Denis-Courmont. *
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* This program is free software; you can redistribute and/or modify *
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* it under the terms of the GNU General Public License as published *
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* by the Free Software Foundation; version 2 of the license, or (at *
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* your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* See the GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, you can get it from: *
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* http://www.gnu.org/copyleft/gpl.html *
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***********************************************************************/
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#include "clock_nanosleep.h"
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#include <errno.h> // for errno, EINVAL
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#include <time.h> // for nanosleep, NULL
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#include "../clock_gettime/clock_gettime.h" // for clock_gettime
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int clock_nanosleep(clockid_t id, int flags, const struct timespec *ts,
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struct timespec *ots) {
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int ret;
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if (id != CLOCK_REALTIME)
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return EINVAL;
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if (flags & TIMER_ABSTIME) {
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struct timespec mine;
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if (clock_gettime(id, &mine))
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return errno;
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if (mine.tv_sec > ts->tv_sec)
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return 0; // behind schedule
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if (mine.tv_nsec > ts->tv_nsec) {
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if (mine.tv_sec == ts->tv_sec)
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return 0; // behind schedule too
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mine.tv_nsec = 1000000000 + ts->tv_nsec - mine.tv_nsec;
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mine.tv_sec++;
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}
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else
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mine.tv_nsec = ts->tv_nsec - mine.tv_nsec;
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mine.tv_sec = ts->tv_sec - mine.tv_sec;
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/* With TIMER_ABSTIME, clock_nanosleep ignores <ots> */
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ret = nanosleep(&mine, NULL);
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}
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else
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ret = nanosleep(ts, ots);
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return ret ? errno : 0;
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}
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