sysdeps/mach/hurd/times.c

   1 /* Return CPU and real time used by process and its children.  Hurd version.
   2    Copyright (C) 2001-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <sys/resource.h>
  22 #include <sys/times.h>
  23 #include <sys/time.h>
  24 #include <time.h>
  25 #include <mach.h>
  26 #include <mach/task_info.h>
  27 #include <hurd.h>
  28
  29 static inline clock_t
  30 clock_from_time_value (const time_value_t *t)
  31 {
  32   return t->seconds * 1000000 + t->microseconds;
  33 }
  34
  35 /* Store the CPU time used by this process and all its
  36    dead children (and their dead children) in BUFFER.
  37    Return the elapsed real time, or (clock_t) -1 for errors.
  38    All times are in CLK_TCKths of a second.  */
  39 clock_t
  40 __times (struct tms *tms)
  41 {
  42   struct task_basic_info bi;
  43   struct task_thread_times_info tti;
  44   mach_msg_type_number_t count;
  45   time_value_t now;
  46   error_t err;
  47
  48   count = TASK_BASIC_INFO_COUNT;
  49   err = __task_info (__mach_task_self (), TASK_BASIC_INFO,
  50                      (task_info_t) &bi, &count);
  51   if (err)
  52     return __hurd_fail (err);
  53
  54   count = TASK_THREAD_TIMES_INFO_COUNT;
  55   err = __task_info (__mach_task_self (), TASK_THREAD_TIMES_INFO,
  56                      (task_info_t) &tti, &count);
  57   if (err)
  58     return __hurd_fail (err);
  59
  60   tms->tms_utime = (clock_from_time_value (&bi.user_time)
  61                     + clock_from_time_value (&tti.user_time));
  62   tms->tms_stime = (clock_from_time_value (&bi.system_time)
  63                     + clock_from_time_value (&tti.system_time));
  64
  65   /* XXX This can't be implemented until getrusage(RUSAGE_CHILDREN) can be.  */
  66   tms->tms_cutime = tms->tms_cstime = 0;
  67
  68   __host_get_time (__mach_host_self (), &now);
  69
  70   return (clock_from_time_value (&now)
  71           - clock_from_time_value (&bi.creation_time));
  72 }
  73 weak_alias (__times, times)