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1 /* ANSI-compatible clock function.
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2 Copyright (C) 1994, 1995, 1999 Free Software Foundation, Inc.
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3
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4 This file is part of the libiberty library. This library is free
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5 software; you can redistribute it and/or modify it under the
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6 terms of the GNU General Public License as published by the
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7 Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with GNU CC; see the file COPYING. If not, write to
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17 the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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18
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19 As a special exception, if you link this library with files
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20 compiled with a GNU compiler to produce an executable, this does not cause
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21 the resulting executable to be covered by the GNU General Public License.
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22 This exception does not however invalidate any other reasons why
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23 the executable file might be covered by the GNU General Public License. */
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24
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25 /*
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26
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27 @deftypefn Supplemental long clock (void)
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28
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29 Returns an approximation of the CPU time used by the process as a
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30 @code{clock_t}; divide this number by @samp{CLOCKS_PER_SEC} to get the
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31 number of seconds used.
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32
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33 @end deftypefn
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34
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35 */
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36
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37 #include "config.h"
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38
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39 #ifdef HAVE_GETRUSAGE
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40 #include <sys/time.h>
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41 #include <sys/resource.h>
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42 #endif
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43
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44 #ifdef HAVE_TIMES
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45 #ifdef HAVE_SYS_PARAM_H
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46 #include <sys/param.h>
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47 #endif
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48 #include <sys/times.h>
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49 #endif
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50
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51 #ifdef HAVE_UNISTD_H
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52 #include <unistd.h>
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53 #endif
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54
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55 #ifdef _SC_CLK_TCK
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56 #define GNU_HZ sysconf(_SC_CLK_TCK)
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57 #else
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58 #ifdef HZ
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59 #define GNU_HZ HZ
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60 #else
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61 #ifdef CLOCKS_PER_SEC
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62 #define GNU_HZ CLOCKS_PER_SEC
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63 #endif
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64 #endif
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65 #endif
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66
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67 /* FIXME: should be able to declare as clock_t. */
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68
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69 long
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70 clock (void)
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71 {
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72 #ifdef HAVE_GETRUSAGE
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73 struct rusage rusage;
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74
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75 getrusage (0, &rusage);
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76 return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
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77 + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
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78 #else
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79 #ifdef HAVE_TIMES
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80 struct tms tms;
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81
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82 times (&tms);
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83 return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
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84 #else
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85 #ifdef VMS
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86 struct
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87 {
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88 int proc_user_time;
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89 int proc_system_time;
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90 int child_user_time;
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91 int child_system_time;
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92 } vms_times;
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93
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94 times (&vms_times);
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95 return (vms_times.proc_user_time + vms_times.proc_system_time) * 10000;
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96 #else
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97 /* A fallback, if nothing else available. */
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98 return 0;
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99 #endif /* VMS */
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100 #endif /* HAVE_TIMES */
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101 #endif /* HAVE_GETRUSAGE */
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102 }
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103
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