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58206c68 | 1 | /* Return the time used by the program so far (user time + system time). |
d614a753 | 2 | Copyright (C) 1991-2020 Free Software Foundation, Inc. |
6d52618b UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
6d52618b UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6d52618b | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
6d52618b UD |
18 | |
19 | #include <sys/times.h> | |
20 | #include <time.h> | |
21 | #include <unistd.h> | |
22 | ||
6d52618b UD |
23 | clock_t |
24 | clock (void) | |
25 | { | |
e9698175 | 26 | struct __timespec64 ts; |
58206c68 | 27 | |
57ada0e7 L |
28 | _Static_assert (CLOCKS_PER_SEC == 1000000, |
29 | "CLOCKS_PER_SEC should be 1000000"); | |
30 | ||
e9698175 | 31 | if (__glibc_unlikely (__clock_gettime64 (CLOCK_PROCESS_CPUTIME_ID, &ts) != 0)) |
58206c68 SP |
32 | return (clock_t) -1; |
33 | ||
34 | return (ts.tv_sec * CLOCKS_PER_SEC | |
35 | + ts.tv_nsec / (1000000000 / CLOCKS_PER_SEC)); | |
6d52618b | 36 | } |