/* Copyright (C) 1991-2018 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 <stddef.h>

#include <sys/vtimes.h>

#include <sys/resource.h>

/* Return the number of 1/VTIMES_UNITS_PER_SECOND-second

   units in the `struct timeval' TV.  */

#define TIMEVAL_TO_VTIMES(tv) \

  ((tv.tv_sec * VTIMES_UNITS_PER_SECOND) + \

   (tv.tv_usec * VTIMES_UNITS_PER_SECOND / 1000000))

/* If VT is not NULL, write statistics for WHO into *VT.

   Return 0 for success, -1 for failure.  */

static int

vtimes_one (struct vtimes *vt, enum __rusage_who who)

{

  if (vt != NULL)

    {

      struct rusage usage;

      if (__getrusage (who, &usage) < 0)

	return -1;

      vt->vm_utime = TIMEVAL_TO_VTIMES (usage.ru_utime);

      vt->vm_stime = TIMEVAL_TO_VTIMES (usage.ru_stime);

      vt->vm_idsrss = usage.ru_idrss + usage.ru_isrss;

      vt->vm_majflt = usage.ru_majflt;

      vt->vm_minflt = usage.ru_minflt;

      vt->vm_nswap = usage.ru_nswap;

      vt->vm_inblk = usage.ru_inblock;

      vt->vm_oublk = usage.ru_oublock;

    }

  return 0;

}

/* If CURRENT is not NULL, write statistics for the current process into

   *CURRENT.  If CHILD is not NULL, write statistics for all terminated child

   processes into *CHILD.  Returns 0 for success, -1 for failure.  */

int

vtimes (struct vtimes *current, struct vtimes *child)

{

  if (vtimes_one (current, RUSAGE_SELF) < 0

      || vtimes_one (child, RUSAGE_CHILDREN) < 0)

    return -1;

  return 0;

}