vtimes.c

一个C源代码分析器

/* Copyright (C) 1991 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#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
DEFUN(vtimes_one, (vt, who),
      struct vtimes *vt AND 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
DEFUN(vtimes, (current, child),
      struct vtimes *current AND struct vtimes *child)
{
  if (vtimes_one(current, RUSAGE_SELF) < 0 ||
      vtimes_one(child, RUSAGE_CHILDREN) < 0)
    return -1;
  return 0;
}