/* * Copyright (C) 2006 Rackable Systems All rights reserved. * Copyright (C) 2015 Red Hat, Inc. All rights reserved. * * This file is part of the device-mapper userspace tools. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU Lesser General Public License v.2.1. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * Abstract out the time methods used so they can be adjusted later - * the results of these routines should stay in-core. */ #include "dmlib.h" #include #define NSEC_PER_USEC UINT64_C(1000) #define NSEC_PER_MSEC UINT64_C(1000000) #define NSEC_PER_SEC UINT64_C(1000000000) /* * The realtime section uses clock_gettime with the CLOCK_MONOTONIC * parameter to prevent issues with time warps * This implementation requires librt. */ #ifdef HAVE_REALTIME #include struct dm_timestamp { struct timespec t; }; static uint64_t _timestamp_to_uint64(struct dm_timestamp *ts) { uint64_t stamp = 0; stamp += (uint64_t) ts->t.tv_sec * NSEC_PER_SEC; stamp += (uint64_t) ts->t.tv_nsec; return stamp; } struct dm_timestamp *dm_timestamp_alloc(void) { struct dm_timestamp *ts = NULL; if (!(ts = dm_zalloc(sizeof(*ts)))) stack; return ts; } int dm_timestamp_get(struct dm_timestamp *ts) { if (!ts) return 0; if (clock_gettime(CLOCK_MONOTONIC, &ts->t)) { log_sys_error("clock_gettime", "get_timestamp"); ts->t.tv_sec = 0; ts->t.tv_nsec = 0; return 0; } return 1; } #else /* ! HAVE_REALTIME */ /* * The !realtime section just uses gettimeofday and is therefore subject * to ntp-type time warps - not sure if should allow that. */ #include struct dm_timestamp { struct timeval t; }; static uint64_t _timestamp_to_uint64(struct dm_timestamp *ts) { uint64_t stamp = 0; stamp += ts->t.tv_sec * NSEC_PER_SEC; stamp += ts->t.tv_usec * NSEC_PER_USEC; return stamp; } struct dm_timestamp *dm_timestamp_alloc(void) { struct dm_timestamp *ts; if (!(ts = dm_malloc(sizeof(*ts)))) stack; return ts; } int dm_timestamp_get(struct dm_timestamp *ts) { if (!ts) return 0; if (gettimeofday(&ts->t, NULL)) { log_sys_error("gettimeofday", "get_timestamp"); ts->t.tv_sec = 0; ts->t.tv_usec = 0; return 0; } return 1; } #endif /* HAVE_REALTIME */ /* * Compare two timestamps. * * Return: -1 if ts1 is less than ts2 * 0 if ts1 is equal to ts2 * 1 if ts1 is greater than ts2 */ int dm_timestamp_compare(struct dm_timestamp *ts1, struct dm_timestamp *ts2) { uint64_t t1, t2; t1 = _timestamp_to_uint64(ts1); t2 = _timestamp_to_uint64(ts2); if (t2 < t1) return 1; if (t1 < t2) return -1; return 0; } /* * Return the absolute difference in nanoseconds between * the dm_timestamp objects ts1 and ts2. * * Callers that need to know whether ts1 is before, equal to, or after ts2 * in addition to the magnitude should use dm_timestamp_compare. */ uint64_t dm_timestamp_delta(struct dm_timestamp *ts1, struct dm_timestamp *ts2) { uint64_t t1, t2; t1 = _timestamp_to_uint64(ts1); t2 = _timestamp_to_uint64(ts2); if (t1 > t2) return t1 - t2; return t2 - t1; } void dm_timestamp_copy(struct dm_timestamp *ts_new, struct dm_timestamp *ts_old) { *ts_new = *ts_old; } void dm_timestamp_destroy(struct dm_timestamp *ts) { dm_free(ts); }