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#include "rbar.h"
#include <stdint.h> /* uint64_t */
#include <stdlib.h> /* atexit(3p) */
#include <sys/timerfd.h>
#include <time.h> /* glock_gettime, localtime, strftime */
const char *cleanup_id;
void strfree(char **strp) {
free(*strp);
}
void cleanup(void) {
char __attribute__((__cleanup__(strfree))) *glob_id = rbar_globescape(cleanup_id);
rbar_remove(glob_id);
}
int update(const char *id) {
cleanup_id = id;
atexit(cleanup);
int timer = timerfd_create(CLOCK_REALTIME, 0);
if (timer < 0)
error(1, errno, "timerfd_create");
struct timespec now;
if (clock_gettime(CLOCK_REALTIME, &now) < 0)
error(1, errno, "clock_gettime");
struct itimerspec spec = {
.it_interval = (struct timespec){.tv_sec = 1, .tv_nsec = 0},
.it_value = (struct timespec){.tv_sec = now.tv_sec+1, .tv_nsec = 0},
};
if (timerfd_settime(timer, TFD_TIMER_ABSTIME, &spec, NULL) < 0)
error(1, errno, "timerfd_settime");
for (;;) {
uint64_t count;
if (read(timer, &count, sizeof count) != sizeof count)
error(1, errno, "read");
if (clock_gettime(CLOCK_REALTIME, &now) < 0)
error(1, errno, "clock_gettime");
char str[80];
if (strftime(str, sizeof str,
"label %a %F %T %Z(%z)", /* apparently %:::z" is supported by date(1gnu) but not strftime(3gnu) */
localtime(&now.tv_sec)) <= 0)
error(1, 0, "strftime wanted a really long string");
rbar_write(id, str);
}
}
struct impl impl = {
.update = update,
};
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