| 1 | /* |
| 2 | * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #include <common/time.h> |
| 19 | #include <common/macros.h> |
| 20 | #include <stddef.h> |
| 21 | #include <stdint.h> |
| 22 | #include <limits.h> |
| 23 | #include <errno.h> |
| 24 | #include <pthread.h> |
| 25 | |
| 26 | LTTNG_HIDDEN |
| 27 | int timespec_to_ms(struct timespec ts, unsigned long *ms) |
| 28 | { |
| 29 | unsigned long res, remain_ms; |
| 30 | |
| 31 | if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) { |
| 32 | errno = EOVERFLOW; |
| 33 | return -1; /* multiplication overflow */ |
| 34 | } |
| 35 | res = ts.tv_sec * MSEC_PER_SEC; |
| 36 | remain_ms = ULONG_MAX - res; |
| 37 | if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) { |
| 38 | errno = EOVERFLOW; |
| 39 | return -1; /* addition overflow */ |
| 40 | } |
| 41 | res += ts.tv_nsec / NSEC_PER_MSEC; |
| 42 | *ms = res; |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | LTTNG_HIDDEN |
| 47 | struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2) |
| 48 | { |
| 49 | uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC + |
| 50 | (uint64_t) t1.tv_nsec; |
| 51 | uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC + |
| 52 | (uint64_t) t2.tv_nsec; |
| 53 | uint64_t diff = max(ts1, ts2) - min(ts1, ts2); |
| 54 | struct timespec res; |
| 55 | |
| 56 | res.tv_sec = diff / (uint64_t) NSEC_PER_SEC; |
| 57 | res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC; |
| 58 | return res; |
| 59 | } |