cosmopolitan/libc/calls/gettimeofday.c
Jōshin 3a8e01a77a
more modeline errata (#1019)
Somehow or another, I previously had missed `BUILD.mk` files.

In the process I found a few straggler cases where the modeline was
different from the file, including one very involved manual fix where a
file had been treated like it was ts=2 and ts=8 on separate occasions.

The commit history in the PR shows the gory details; the BUILD.mk was
automated, everything else was mostly manual.
2023-12-16 23:07:10 -05:00

60 lines
2.8 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/timespec.h"
#include "libc/calls/struct/timeval.h"
#include "libc/sysv/consts/clock.h"
#include "libc/time/struct/timezone.h"
/**
* Returns system wall time in microseconds, e.g.
*
* int64_t t;
* char p[20];
* struct tm tm;
* struct timeval tv;
* gettimeofday(&tv, 0);
* t = tv.tv_sec;
* gmtime_r(&t, &tm);
* iso8601(p, &tm);
* printf("%s\n", p);
*
* @param tv points to timeval that receives result if non-null
* @param tz is completely ignored
* @return 0 on success, or -1 w/ errno
* @raise EFAULT if `tv` points to invalid memory
* @see clock_gettime() for nanosecond precision
* @see strftime() for string formatting
* @asyncsignalsafe
* @vforksafe
*/
int gettimeofday(struct timeval *tv, struct timezone *tz) {
if (tv) {
struct timespec ts;
if (clock_gettime(CLOCK_REALTIME, &ts) != -1) {
tv->tv_sec = ts.tv_sec;
tv->tv_usec = (ts.tv_nsec + 999) / 1000;
return 0;
} else {
return -1;
}
} else {
return 0;
}
}