/* ANSI-compatible clock function.   Copyright (C) 1994-2026 Free Software Foundation, Inc. This file is part of the libiberty library.  This library is freesoftware; you can redistribute it and/or modify it under theterms of the GNU General Public License as published by theFree 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 ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See theGNU General Public License for more details. You should have received a copy of the GNU General Public Licensealong with GNU CC; see the file COPYING.  If not, write tothe Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. As a special exception, if you link this library with filescompiled with a GNU compiler to produce an executable, this does not causethe resulting executable to be covered by the GNU General Public License.This exception does not however invalidate any other reasons whythe 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 thenumber 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. */ longclock (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 */}