mirror of
https://github.com/jart/cosmopolitan.git
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b0df6c1fce
Cosmopolitan now supports 104 time zones. They're embedded inside any binary that links the localtime() function. Doing so adds about 100kb to the binary size. This change also gets time zones working properly on Windows for the first time. It's not needed to have /etc/localtime exist on Windows, since we can get this information from WIN32. We're also now updated to the latest version of Paul Eggert's TZ library.
67 lines
3.6 KiB
C
67 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.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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