kc3-lang/gnulib/lib/getrusage.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/getrusage.c

• /* getrusage replacement for systems which lack it.
  
     Copyright (C) 2012-2023 Free Software Foundation, Inc.
  
     This file 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 3 of the
     License, or (at your option) any later version.
  
     This file 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible, 2012.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <sys/resource.h>
  
  #include <errno.h>
  #include <string.h>
  
  /* Get uint64_t.  */
  #include <stdint.h>
  
  #if defined _WIN32 && ! defined __CYGWIN__
  
  # define WIN32_LEAN_AND_MEAN
  # include <windows.h>
  
  #else
  
  # include <sys/times.h>
  # include <unistd.h>
  #endif
  
  int
  getrusage (int who, struct rusage *usage_p)
  {
    if (who == RUSAGE_SELF || who == RUSAGE_CHILDREN)
      {
        /* Clear all unsupported members of 'struct rusage'.  */
        memset (usage_p, '\0', sizeof (struct rusage));
  
  #if defined _WIN32 && ! defined __CYGWIN__
        if (who == RUSAGE_SELF)
          {
            /* Fill in the ru_utime and ru_stime members.  */
            FILETIME creation_time;
            FILETIME exit_time;
            FILETIME kernel_time;
            FILETIME user_time;
  
            if (GetProcessTimes (GetCurrentProcess (),
                                 &creation_time, &exit_time,
                                 &kernel_time, &user_time))
              {
                /* Convert to microseconds, rounding.  */
                uint64_t kernel_usec =
                  ((((uint64_t) kernel_time.dwHighDateTime << 32)
                    | (uint64_t) kernel_time.dwLowDateTime)
                   + 5) / 10;
                uint64_t user_usec =
                  ((((uint64_t) user_time.dwHighDateTime << 32)
                    | (uint64_t) user_time.dwLowDateTime)
                   + 5) / 10;
  
                usage_p->ru_utime.tv_sec = user_usec / 1000000U;
                usage_p->ru_utime.tv_usec = user_usec % 1000000U;
                usage_p->ru_stime.tv_sec = kernel_usec / 1000000U;
                usage_p->ru_stime.tv_usec = kernel_usec % 1000000U;
              }
          }
  #else
        /* Fill in the ru_utime and ru_stime members.  */
        {
          struct tms time;
  
          if (times (&time) != (clock_t) -1)
            {
              /* Number of clock ticks per second.  */
              unsigned int clocks_per_second = sysconf (_SC_CLK_TCK);
  
              if (clocks_per_second > 0)
                {
                  clock_t user_ticks;
                  clock_t system_ticks;
  
                  uint64_t user_usec;
                  uint64_t system_usec;
  
                  if (who == RUSAGE_CHILDREN)
                    {
                      user_ticks   = time.tms_cutime;
                      system_ticks = time.tms_cstime;
                    }
                  else
                    {
                      user_ticks   = time.tms_utime;
                      system_ticks = time.tms_stime;
                    }
  
                  user_usec =
                    (((uint64_t) user_ticks * (uint64_t) 1000000U)
                     + clocks_per_second / 2) / clocks_per_second;
                  system_usec =
                    (((uint64_t) system_ticks * (uint64_t) 1000000U)
                     + clocks_per_second / 2) / clocks_per_second;
  
                  usage_p->ru_utime.tv_sec = user_usec / 1000000U;
                  usage_p->ru_utime.tv_usec = user_usec % 1000000U;
                  usage_p->ru_stime.tv_sec = system_usec / 1000000U;
                  usage_p->ru_stime.tv_usec = system_usec % 1000000U;
                }
            }
        }
  #endif
  
        return 0;
      }
    else
      {
        errno = EINVAL;
        return -1;
      }
  }
  

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