1  /* ANSI-compatible clock function.
       2     Copyright (C) 1994-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of the libiberty library.  This library is free
       5  software; you can redistribute it and/or modify it under the
       6  terms of the GNU General Public License as published by the
       7  Free Software Foundation; either version 2, or (at your option)
       8  any later version.
       9  
      10  This 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
      13  GNU General Public License for more details.
      14  
      15  You should have received a copy of the GNU General Public License
      16  along with GNU CC; see the file COPYING.  If not, write to
      17  the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
      18  
      19  As a special exception, if you link this library with files
      20  compiled with a GNU compiler to produce an executable, this does not cause
      21  the resulting executable to be covered by the GNU General Public License.
      22  This exception does not however invalidate any other reasons why
      23  the executable file might be covered by the GNU General Public License. */
      24  
      25  /*
      26  
      27  @deftypefn Supplemental long clock (void)
      28  
      29  Returns an approximation of the CPU time used by the process as a
      30  @code{clock_t}; divide this number by @samp{CLOCKS_PER_SEC} to get the
      31  number of seconds used.
      32  
      33  @end deftypefn
      34  
      35  */
      36  
      37  #include "config.h"
      38  
      39  #ifdef HAVE_GETRUSAGE
      40  #include <sys/time.h>
      41  #include <sys/resource.h>
      42  #endif
      43  
      44  #ifdef HAVE_TIMES
      45  #ifdef HAVE_SYS_PARAM_H
      46  #include <sys/param.h>
      47  #endif
      48  #include <sys/times.h>
      49  #endif
      50  
      51  #ifdef HAVE_UNISTD_H
      52  #include <unistd.h>
      53  #endif
      54  
      55  #ifdef _SC_CLK_TCK
      56  #define GNU_HZ  sysconf(_SC_CLK_TCK)
      57  #else
      58  #ifdef HZ
      59  #define GNU_HZ  HZ
      60  #else
      61  #ifdef CLOCKS_PER_SEC
      62  #define GNU_HZ  CLOCKS_PER_SEC
      63  #endif
      64  #endif
      65  #endif
      66  
      67  /* FIXME: should be able to declare as clock_t. */
      68  
      69  long
      70  clock (void)
      71  {
      72  #ifdef HAVE_GETRUSAGE
      73    struct rusage rusage;
      74  
      75    getrusage (0, &rusage);
      76    return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
      77  	  + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
      78  #else
      79  #ifdef HAVE_TIMES
      80    struct tms tms;
      81  
      82    times (&tms);
      83    return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
      84  #else
      85  #ifdef VMS
      86    struct
      87      {
      88        int proc_user_time;
      89        int proc_system_time;
      90        int child_user_time;
      91        int child_system_time;
      92      } vms_times;
      93  
      94    times (&vms_times);
      95    return (vms_times.proc_user_time + vms_times.proc_system_time) * 10000;
      96  #else
      97    /* A fallback, if nothing else available. */
      98    return 0;
      99  #endif /* VMS */
     100  #endif /* HAVE_TIMES */
     101  #endif /* HAVE_GETRUSAGE */
     102  }
     103