mirror of
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53 lines
2.9 KiB
C
53 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/rusage.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/calls/struct/tms.h"
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#include "libc/runtime/clktck.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/consts/rusage.h"
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static long MicrosToTicks(struct timeval tv) {
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return tv.tv_sec * CLK_TCK + tv.tv_usec / (1000000 / CLK_TCK);
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}
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static long NanosToTicks(struct timespec ts) {
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return ts.tv_sec * CLK_TCK + ts.tv_nsec / (1000000000 / CLK_TCK);
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}
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/**
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* Returns accounting data for process on time-sharing system.
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* @return number of `CLK_TCK` from `CLOCK_BOOTTIME` epoch
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*/
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long times(struct tms *out_times) {
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struct timespec bt;
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struct rusage rus, ruc;
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if (getrusage(RUSAGE_SELF, &rus))
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return -1;
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if (getrusage(RUSAGE_CHILDREN, &ruc))
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return -1;
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if (clock_gettime(CLOCK_BOOTTIME, &bt))
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return -1;
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out_times->tms_utime = MicrosToTicks(rus.ru_utime);
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out_times->tms_stime = MicrosToTicks(rus.ru_stime);
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out_times->tms_cutime = MicrosToTicks(ruc.ru_utime);
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out_times->tms_cstime = MicrosToTicks(ruc.ru_stime);
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return NanosToTicks(bt);
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}
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