| 1 | /* ANSI-compatible clock function. |
| 2 | Copyright (C) 1994-2018 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 | |