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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
66 lines
3.6 KiB
C
66 lines
3.6 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/sysv/consts/clock.h"
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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/errno.h"
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#include "libc/sysv/consts/rusage.h"
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#include "libc/time/time.h"
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/**
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* Returns sum of CPU time consumed by current process since birth.
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*
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* This function provides a basic idea of how computationally expensive
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* your program is, in terms of both the userspace and kernel processor
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* resources it's hitherto consumed. Here's an example of how you might
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* display this information:
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*
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* printf("consumed %g seconds of cpu time\n",
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* (double)clock() / CLOCKS_PER_SEC);
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*
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* This function offers at best microsecond accuracy on all supported
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* platforms. Please note the reported values might be a bit chunkier
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* depending on the kernel scheduler sampling interval see `CLK_TCK`.
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*
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* @return units of CPU time consumed, where each unit's time length
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* should be `1./CLOCKS_PER_SEC` seconds; Cosmopolitan currently
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* returns the unit count in microseconds, i.e. `CLOCKS_PER_SEC`
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* is hard-coded as 1000000. On failure this returns -1 / errno.
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* @raise ENOSYS should be returned currently if run on Bare Metal
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* @see clock_gettime() which polyfills this on Linux and BSDs
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* @see getrusage() which polyfills this on XNU and NT
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*/
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int64_t clock(void) {
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int e;
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struct rusage ru;
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struct timespec ts;
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e = errno;
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if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts)) {
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errno = e;
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if (getrusage(RUSAGE_SELF, &ru) != -1) {
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ts = timeval_totimespec(timeval_add(ru.ru_utime, ru.ru_stime));
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} else {
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return -1;
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}
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}
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// convert nanoseconds to microseconds w/ ceil rounding
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// this would need roughly ~7,019,309 years to overflow
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return ts.tv_sec * 1000000 + (ts.tv_nsec + 999) / 1000;
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}
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