File: clock.c

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/* ANSI-compatible clock function.
   Copyright (C) 1994-2018 Free Software Foundation, Inc.

This file is part of the libiberty library.  This library is free
software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version.

This library 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.

As a special exception, if you link this library with files
compiled with a GNU compiler to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */

/*

@deftypefn Supplemental long clock (void)

Returns an approximation of the CPU time used by the process as a
@code{clock_t}; divide this number by @samp{CLOCKS_PER_SEC} to get the
number of seconds used.

@end deftypefn

*/

#include "config.h"

#ifdef HAVE_GETRUSAGE
#include <sys/time.h>
#include <sys/resource.h>
#endif

#ifdef HAVE_TIMES
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/times.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef _SC_CLK_TCK
#define GNU_HZ  sysconf(_SC_CLK_TCK)
#else
#ifdef HZ
#define GNU_HZ  HZ
#else
#ifdef CLOCKS_PER_SEC
#define GNU_HZ  CLOCKS_PER_SEC
#endif
#endif
#endif

/* FIXME: should be able to declare as clock_t. */

long
clock (void)
{
#ifdef HAVE_GETRUSAGE
  struct rusage rusage;

  getrusage (0, &rusage);
  return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
	  + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
#else
#ifdef HAVE_TIMES
  struct tms tms;

  times (&tms);
  return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
#else
#ifdef VMS
  struct
    {
      int proc_user_time;
      int proc_system_time;
      int child_user_time;
      int child_system_time;
    } vms_times;

  times (&vms_times);
  return (vms_times.proc_user_time + vms_times.proc_system_time) * 10000;
#else
  /* A fallback, if nothing else available. */
  return 0;
#endif /* VMS */
#endif /* HAVE_TIMES */
#endif /* HAVE_GETRUSAGE */
}