1 /* getrusage replacement for systems which lack it.
3 Copyright (C) 2012 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program 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.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Written by Bruno Haible, 2012. */
23 #include <sys/resource.h>
31 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
33 # define WIN32_LEAN_AND_MEAN
38 # include <sys/times.h>
43 getrusage (int who, struct rusage *usage_p)
45 if (who == RUSAGE_SELF || who == RUSAGE_CHILDREN)
47 /* Clear all unsupported members of 'struct rusage'. */
48 memset (usage_p, '\0', sizeof (struct rusage));
50 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
51 if (who == RUSAGE_SELF)
53 /* Fill in the ru_utime and ru_stime members. */
54 FILETIME creation_time;
59 if (GetProcessTimes (GetCurrentProcess (),
60 &creation_time, &exit_time,
61 &kernel_time, &user_time))
63 /* Convert to microseconds, rounding. */
64 uint64_t kernel_usec =
65 ((((uint64_t) kernel_time.dwHighDateTime << 32)
66 | (uint64_t) kernel_time.dwLowDateTime)
69 ((((uint64_t) user_time.dwHighDateTime << 32)
70 | (uint64_t) user_time.dwLowDateTime)
73 usage_p->ru_utime.tv_sec = user_usec / 1000000U;
74 usage_p->ru_utime.tv_usec = user_usec % 1000000U;
75 usage_p->ru_stime.tv_sec = kernel_usec / 1000000U;
76 usage_p->ru_stime.tv_usec = kernel_usec % 1000000U;
80 /* Fill in the ru_utime and ru_stime members. */
84 if (times (&time) != (clock_t) -1)
86 /* Number of clock ticks per second. */
87 unsigned int clocks_per_second = sysconf (_SC_CLK_TCK);
89 if (clocks_per_second > 0)
97 if (who == RUSAGE_CHILDREN)
99 user_ticks = time.tms_cutime;
100 system_ticks = time.tms_cstime;
104 user_ticks = time.tms_utime;
105 system_ticks = time.tms_stime;
109 (((uint64_t) user_ticks * (uint64_t) 1000000U)
110 + clocks_per_second / 2) / clocks_per_second;
112 (((uint64_t) system_ticks * (uint64_t) 1000000U)
113 + clocks_per_second / 2) / clocks_per_second;
115 usage_p->ru_utime.tv_sec = user_usec / 1000000U;
116 usage_p->ru_utime.tv_usec = user_usec % 1000000U;
117 usage_p->ru_stime.tv_sec = system_usec / 1000000U;
118 usage_p->ru_stime.tv_usec = system_usec % 1000000U;