40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/* Return the time used by the program so far (user time + system time).
|
|
Copyright (C) 1991-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/times.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
clock_t
|
|
clock (void)
|
|
{
|
|
struct timespec ts;
|
|
|
|
_Static_assert (CLOCKS_PER_SEC == 1000000,
|
|
"CLOCKS_PER_SEC should be 1000000");
|
|
|
|
/* clock_gettime shouldn't fail here since CLOCK_PROCESS_CPUTIME_ID is
|
|
supported since 2.6.12. Check the return value anyway in case the kernel
|
|
barfs on us for some reason. */
|
|
if (__glibc_unlikely (__clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &ts) != 0))
|
|
return (clock_t) -1;
|
|
|
|
return (ts.tv_sec * CLOCKS_PER_SEC
|
|
+ ts.tv_nsec / (1000000000 / CLOCKS_PER_SEC));
|
|
}
|