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/* getrusage replacement for systems which lack it.
Copyright (C) 2012-2026 Free Software Foundation, Inc.
This file 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 3 of the
License, or (at your option) any later version.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible, 2012. */
#include <config.h>
/* Specification. */
#include <sys/resource.h>
#include <errno.h>
#include <string.h>
/* Get uint64_t. */
#include <stdint.h>
#if defined _WIN32 && ! defined __CYGWIN__
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#else
# include <sys/times.h>
# include <unistd.h>
#endif
int
getrusage (int who, struct rusage *usage_p)
{
if (who == RUSAGE_SELF || who == RUSAGE_CHILDREN)
{
/* Clear all unsupported members of 'struct rusage'. */
memset (usage_p, '\0', sizeof (struct rusage));
#if defined _WIN32 && ! defined __CYGWIN__
if (who == RUSAGE_SELF)
{
/* Fill in the ru_utime and ru_stime members. */
FILETIME creation_time;
FILETIME exit_time;
FILETIME kernel_time;
FILETIME user_time;
if (GetProcessTimes (GetCurrentProcess (),
&creation_time, &exit_time,
&kernel_time, &user_time))
{
/* Convert to microseconds, rounding. */
uint64_t kernel_usec =
((((uint64_t) kernel_time.dwHighDateTime << 32)
| (uint64_t) kernel_time.dwLowDateTime)
+ 5) / 10;
uint64_t user_usec =
((((uint64_t) user_time.dwHighDateTime << 32)
| (uint64_t) user_time.dwLowDateTime)
+ 5) / 10;
usage_p->ru_utime.tv_sec = user_usec / 1000000U;
usage_p->ru_utime.tv_usec = user_usec % 1000000U;
usage_p->ru_stime.tv_sec = kernel_usec / 1000000U;
usage_p->ru_stime.tv_usec = kernel_usec % 1000000U;
}
}
#else
/* Fill in the ru_utime and ru_stime members. */
{
struct tms time;
if (times (&time) != (clock_t) -1)
{
/* Number of clock ticks per second. */
unsigned int clocks_per_second = sysconf (_SC_CLK_TCK);
if (clocks_per_second > 0)
{
clock_t user_ticks;
clock_t system_ticks;
if (who == RUSAGE_CHILDREN)
{
user_ticks = time.tms_cutime;
system_ticks = time.tms_cstime;
}
else
{
user_ticks = time.tms_utime;
system_ticks = time.tms_stime;
}
uint64_t user_usec =
(((uint64_t) user_ticks * (uint64_t) 1000000U)
+ clocks_per_second / 2) / clocks_per_second;
uint64_t system_usec =
(((uint64_t) system_ticks * (uint64_t) 1000000U)
+ clocks_per_second / 2) / clocks_per_second;
usage_p->ru_utime.tv_sec = user_usec / 1000000U;
usage_p->ru_utime.tv_usec = user_usec % 1000000U;
usage_p->ru_stime.tv_sec = system_usec / 1000000U;
usage_p->ru_stime.tv_usec = system_usec % 1000000U;
}
}
}
#endif
return 0;
}
else
{
errno = EINVAL;
return -1;
}
}
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