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#include <assert.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <libgen.h>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <libintl.h>
#define _(x) gettext(x)
#define NSEC_PER_SEC UINT64_C(1'000'000'000)
#if __APPLE__
#define TIMER_ABSTIME (1)
int clock_nanosleep(clockid_t, int, const struct timespec *, struct timespec *);
#endif
time_t syncs(time_t), syncm(time_t), synch(time_t);
static void
usage(const char *argv0, int code)
{
fprintf(stderr, _("Usage: %s [-h] [-i interval] [format]\n"), argv0);
exit(code);
}
int
main(int argc, char **argv)
{
setlocale(LC_ALL, "");
bindtextdomain("messages", PODIR);
textdomain("messages");
char interval = 's';
const char *argv0 = basename(argv[0]);
const char *dfmt = "%c", *optstr = "hi:";
static struct option longopts[] = {
{"help", no_argument, nullptr, 'h'},
{"interval", required_argument, nullptr, 'i'},
{nullptr, 0, nullptr, 0 },
};
for (;;) {
int opt = getopt_long(argc, argv, optstr, longopts, nullptr);
if (opt == -1)
break;
switch (opt) {
case 'h':
usage(argv0, EXIT_SUCCESS);
case 'i':
if (strlen(optarg) == 1) {
interval = *optarg;
if (interval == 's' || interval == 'm' || interval == 'h')
break;
}
errx(EXIT_FAILURE,
_("invalid interval ‘%s’\nRead the %s(1) manual page for valid intervals"),
optarg, argv0);
default:
usage(argv0, EXIT_FAILURE);
}
}
argc -= optind;
argv += optind;
if (argc > 1)
usage(argv0, EXIT_FAILURE);
if (argc != 0)
dfmt = argv[0];
time_t (*sync)(time_t) =
interval == 's' ? syncs
: interval == 'm' ? syncm
: interval == 'h' ? synch
: /* default */ syncs;
for (;;) {
struct timespec before, after;
if (clock_gettime(CLOCK_REALTIME, &before) == -1)
warn(_("failed to get the time"));
time_t now = time(NULL);
struct tm *tm = localtime(&now);
char buf[256];
size_t n = strftime(buf, sizeof(buf), dfmt, tm);
if (n == 0)
warnx(_("buffer too small"));
puts(buf);
if (clock_gettime(CLOCK_REALTIME, &after) == -1)
warn(_("failed to get the time"));
/* Duration of the clock formatting and printing */
struct timespec Δ = {
after.tv_sec - before.tv_sec,
after.tv_nsec - before.tv_nsec,
};
if (Δ.tv_nsec < 0) {
Δ.tv_nsec += NSEC_PER_SEC;
Δ.tv_sec--;
}
struct timespec rqtp = {
.tv_sec = sync(after.tv_sec),
.tv_nsec = 0,
};
int rv;
do
rv = clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &rqtp, nullptr);
while (rv == -1 && errno == EINTR);
}
/* We should never get here */
return EXIT_FAILURE;
}
time_t
syncs(time_t n)
{
return n + 1;
}
time_t
syncm(time_t n)
{
return n + 60 - n%60;
}
time_t
synch(time_t n)
{
return n + 3600 - n%3600;
}
#if __APPLE__
int
clock_nanosleep(clockid_t clock_id, int flags, const struct timespec *req,
struct timespec *rem)
{
/* The rest not implemented */
assert(flags == TIMER_ABSTIME);
struct timespec now, Δ;
if (clock_gettime(clock_id, &now) != 0)
return errno;
Δ.tv_sec = req->tv_sec - now.tv_sec;
Δ.tv_nsec = req->tv_nsec - now.tv_nsec;
if (Δ.tv_sec < 0) {
Δ.tv_sec = 0;
Δ.tv_nsec = 0;
goto out;
}
if (Δ.tv_nsec < 0) {
if (Δ.tv_sec == 0) {
Δ.tv_sec = 0;
Δ.tv_nsec = 0;
goto out;
}
Δ.tv_sec--;
Δ.tv_nsec += NSEC_PER_SEC;
}
out:
return nanosleep(&Δ, rem);
}
#endif
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