int main(int argc, char *argv[])
{
unsigned long sleep_time;
double read_interval;
start_time = time(0);
memset(&rtiming, 0, sizeof(rtiming));
rtiming.rt_variance.v_min = FLT_MAX;
/*
* Early initialization before reading config
*/
conf_init_pre();
parse_args_pre(argc, argv);
/*
* Reading the configuration file */
configfile_read();
/*
* Late initialization after reading config
*/
if (parse_args_post(argc, argv))
return 1;
conf_init_post();
module_init();
read_interval = cfg_read_interval;
sleep_time = cfg_getint(cfg, "sleep_time");
if (((double) sleep_time / 1000000.0f) > read_interval)
sleep_time = (unsigned long) (read_interval * 1000000.0f);
DBG("Entering mainloop...");
do {
/*
* E := Elapsed time
* NR := Next Read
* LR := Last Read
* RI := Read Interval
* ST := Sleep Time
* C := Correction
*/
timestamp_t e, ri, tmp;
unsigned long st;
float_to_timestamp(&ri, read_interval);
/*
* NR := NOW
*/
update_timestamp(&rtiming.rt_next_read);
for (;;) {
output_pre();
/*
* E := NOW
*/
update_timestamp(&e);
/*
* IF NR <= E THEN
*/
if (timestamp_le(&rtiming.rt_next_read, &e)) {
timestamp_t c;
/*
* C := (NR - E)
*/
timestamp_sub(&c, &rtiming.rt_next_read, &e);
//calc_variance(&c, &ri);
/*
* LR := E
*/
copy_timestamp(&rtiming.rt_last_read, &e);
/*
* NR := E + RI + C
*/
timestamp_add(&rtiming.rt_next_read, &e, &ri);
timestamp_add(&rtiming.rt_next_read,
&rtiming.rt_next_read, &c);
reset_update_flags();
input_read();
free_unused_elements();
output_draw();
output_post();
}
if (do_quit)
exit(0);
/*
* ST := Configured ST
*/
st = sleep_time;
/*
* IF (NR - E) < ST THEN
*/
timestamp_sub(&tmp, &rtiming.rt_next_read, &e);
if (tmp.tv_sec < 0)
continue;
if (tmp.tv_sec == 0 && tmp.tv_usec < st) {
if (tmp.tv_usec < 0)
continue;
/*
* ST := (NR - E)
*/
st = tmp.tv_usec;
}
/*
* SLEEP(ST)
*/
usleep(st);
}
} while (0);
return 0; /* buddha says i'll never be reached */
}
int main(int argc, char *argv[])
{
unsigned long sleep_time;
double read_interval;
start_time = time(0);
parse_args_pre(argc, argv);
configfile_read();
parse_args_post(argc, argv);
conf_init();
module_init();
read_interval = cfg_read_interval;
sleep_time = cfg_getint(cfg, "sleep_time");
if (((double) sleep_time / 1000000.0f) > read_interval)
sleep_time = (unsigned long) (read_interval * 1000000.0f);
// pipe_start();
if (cfg_getbool(cfg, "daemon")) {
init_syslog();
daemonize();
write_pidfile();
}
drop_privs();
do {
/*
* E := Elapsed time
* NR := Next Read
* LR := Last Read
* RI := Read Interval
* ST := Sleep Time
* C := Correction
*/
timestamp_t e, ri, tmp;
unsigned long st;
float_to_timestamp(&ri, read_interval);
/*
* NR := NOW
*/
update_timestamp(&rtiming.rt_next_read);
for (;;) {
output_pre();
/*
* read the chucka chucka pipe
*/
// pipe_handle();
/*
* E := NOW
*/
update_timestamp(&e);
/*
* IF NR <= E THEN
*/
if (timestamp_le(&rtiming.rt_next_read, &e)) {
timestamp_t c;
/*
* C := (NR - E)
*/
timestamp_sub(&c, &rtiming.rt_next_read, &e);
//calc_variance(&c, &ri);
/*
* LR := E
*/
copy_timestamp(&rtiming.rt_last_read, &e);
/*
* NR := E + RI + C
*/
timestamp_add(&rtiming.rt_next_read, &e, &ri);
timestamp_add(&rtiming.rt_next_read,
&rtiming.rt_next_read, &c);
reset_update_flags();
input_read();
free_unused_elements();
output_draw();
output_post();
}
if (do_quit)
exit(0);
/*
* ST := Configured ST
*/
st = sleep_time;
/*
* IF (NR - E) < ST THEN
*/
timestamp_sub(&tmp, &rtiming.rt_next_read, &e);
if (tmp.tv_sec < 0)
continue;
if (tmp.tv_sec == 0 && tmp.tv_usec < st) {
if (tmp.tv_usec < 0)
continue;
/*
* ST := (NR - E)
*/
st = tmp.tv_usec;
}
/*
* SLEEP(ST)
*/
usleep(st);
}
} while (0);
return 0; /* buddha says i'll never be reached */
}