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1 /* ANSI-compatible clock function.
2 Copyright (C) 1994-2019 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