resource/vtimes.c

   1 /* Copyright (C) 1991-2020 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stddef.h>
  19 #include <sys/vtimes.h>
  20 #include <sys/resource.h>
  21
  22 /* Return the number of 1/VTIMES_UNITS_PER_SECOND-second
  23    units in the `struct timeval' TV.  */
  24 #define TIMEVAL_TO_VTIMES(tv) \
  25   ((tv.tv_sec * VTIMES_UNITS_PER_SECOND) \
  26    + (tv.tv_usec * VTIMES_UNITS_PER_SECOND / 1000000))
  27
  28 /* If VT is not NULL, write statistics for WHO into *VT.
  29    Return 0 for success, -1 for failure.  */
  30 static int
  31 vtimes_one (struct vtimes *vt, enum __rusage_who who)
  32 {
  33   if (vt != NULL)
  34     {
  35       struct rusage usage;
  36
  37       if (__getrusage (who, &usage) < 0)
  38         return -1;
  39
  40       vt->vm_utime = TIMEVAL_TO_VTIMES (usage.ru_utime);
  41       vt->vm_stime = TIMEVAL_TO_VTIMES (usage.ru_stime);
  42       vt->vm_idsrss = usage.ru_idrss + usage.ru_isrss;
  43       vt->vm_majflt = usage.ru_majflt;
  44       vt->vm_minflt = usage.ru_minflt;
  45       vt->vm_nswap = usage.ru_nswap;
  46       vt->vm_inblk = usage.ru_inblock;
  47       vt->vm_oublk = usage.ru_oublock;
  48     }
  49   return 0;
  50 }
  51
  52 /* If CURRENT is not NULL, write statistics for the current process into
  53    *CURRENT.  If CHILD is not NULL, write statistics for all terminated child
  54    processes into *CHILD.  Returns 0 for success, -1 for failure.  */
  55 int
  56 vtimes (struct vtimes *current, struct vtimes *child)
  57 {
  58   if (vtimes_one (current, RUSAGE_SELF) < 0
  59       || vtimes_one (child, RUSAGE_CHILDREN) < 0)
  60     return -1;
  61   return 0;
  62 }