/* times.c - times(3) library function */

/* Copyright (C) 1999-2020,2022 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Bash 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#if !defined (HAVE_TIMES)

#include <sys/types.h>
#include <posixtime.h>
#include <systimes.h>

#if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_GETRUSAGE)
#  include <sys/resource.h>
#endif /* HAVE_SYS_RESOURCE_H && HAVE_GETRUSAGE */

extern long get_clk_tck (void);

#define CONVTCK(r)      (r.tv_sec * clk_tck + r.tv_usec / (1000000 / clk_tck))

clock_t
times(struct tms *tms)
{
	clock_t rv;
	static long clk_tck = -1;

#if defined (HAVE_GETRUSAGE)
	struct timeval tv;
	struct rusage ru;

	if (clk_tck == -1)
		clk_tck = get_clk_tck();

	if (getrusage(RUSAGE_SELF, &ru) < 0)
		return ((clock_t)-1);
	tms->tms_utime = CONVTCK(ru.ru_utime);
	tms->tms_stime = CONVTCK(ru.ru_stime);

	if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
		return ((clock_t)-1);
	tms->tms_cutime = CONVTCK(ru.ru_utime);
	tms->tms_cstime = CONVTCK(ru.ru_stime);

	if (gettimeofday(&tv, NULL) < 0)
		return ((clock_t)-1);
	rv = (clock_t)(CONVTCK(tv));
#else /* !HAVE_GETRUSAGE */
	if (clk_tck == -1)
		clk_tck = get_clk_tck();

	/* We can't do anything. */
	tms->tms_utime = tms->tms_stime = (clock_t)0;
	tms->tms_cutime = tms->tms_cstime = (clock_t)0;

	rv = (clock_t)time((time_t *)0) * clk_tck;
# endif /* HAVE_GETRUSAGE */

	return rv;
}
#endif /* !HAVE_TIMES */
