resource/vtimes.c

   1 /* Copyright (C) 1991, 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <stddef.h>
  20 #include <sys/vtimes.h>
  21 #include <sys/resource.h>
  22
  23 /* Return the number of 1/VTIMES_UNITS_PER_SECOND-second
  24    units in the `struct timeval' TV.  */
  25 #define TIMEVAL_TO_VTIMES(tv) \
  26   ((tv.tv_sec * VTIMES_UNITS_PER_SECOND) + \
  27    (tv.tv_usec * VTIMES_UNITS_PER_SECOND / 1000000))
  28
  29 /* If VT is not NULL, write statistics for WHO into *VT.
  30    Return 0 for success, -1 for failure.  */
  31 static int
  32 vtimes_one (struct vtimes *vt, enum __rusage_who who)
  33 {
  34   if (vt != NULL)
  35     {
  36       struct rusage usage;
  37
  38       if (__getrusage (who, &usage) < 0)
  39         return -1;
  40
  41       vt->vm_utime = TIMEVAL_TO_VTIMES (usage.ru_utime);
  42       vt->vm_stime = TIMEVAL_TO_VTIMES (usage.ru_stime);
  43       vt->vm_idsrss = usage.ru_idrss + usage.ru_isrss;
  44       vt->vm_majflt = usage.ru_majflt;
  45       vt->vm_minflt = usage.ru_minflt;
  46       vt->vm_nswap = usage.ru_nswap;
  47       vt->vm_inblk = usage.ru_inblock;
  48       vt->vm_oublk = usage.ru_oublock;
  49     }
  50   return 0;
  51 }
  52
  53 /* If CURRENT is not NULL, write statistics for the current process into
  54    *CURRENT.  If CHILD is not NULL, write statistics for all terminated child
  55    processes into *CHILD.  Returns 0 for success, -1 for failure.  */
  56 int
  57 vtimes (current, child)
  58      struct vtimes *current;
  59      struct vtimes *child;
  60 {
  61   if (vtimes_one (current, RUSAGE_SELF) < 0
  62       || vtimes_one (child, RUSAGE_CHILDREN) < 0)
  63     return -1;
  64   return 0;
  65 }