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      1 /* ANSI-compatible clock function.
      2    Copyright (C) 1994, 1995, 1999 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 
    104