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/* SPDX-License-Identifier: ISC */
#include "gcrond.h"
static crontab_t *jobs;
static sig_atomic_t run = 1;
static sig_atomic_t rescan = 1;
static void read_config(void)
{
if (cronscan(GCRONDIR, &jobs)) {
fputs("Error reading configuration. Continuing anyway.\n",
stderr);
}
}
static void cleanup_config(void)
{
crontab_t *t;
while (jobs != NULL) {
t = jobs;
jobs = jobs->next;
delcron(t);
}
}
static int timeout_minutes(int minutes)
{
time_t now = time(NULL);
struct tm t;
localtime_r(&now, &t);
return minutes * 60 + 30 - t.tm_sec;
}
static int calc_timeout(void)
{
time_t now = time(NULL), future;
struct tm tmstruct;
crontab_t mask, *t;
int minutes;
for (minutes = 0; minutes < 120; ++minutes) {
future = now + minutes * 60;
localtime_r(&future, &tmstruct);
cron_tm_to_mask(&mask, &tmstruct);
for (t = jobs; t != NULL; t = t->next) {
if (cron_should_run(t, &mask))
goto out;
}
}
out:
return timeout_minutes(minutes ? minutes : 1);
}
static void runjobs(void)
{
time_t now = time(NULL);
struct tm tmstruct;
crontab_t mask, *t;
localtime_r(&now, &tmstruct);
cron_tm_to_mask(&mask, &tmstruct);
for (t = jobs; t != NULL; t = t->next) {
if (cron_should_run(t, &mask))
runjob(t);
}
}
static void sighandler(int signo)
{
pid_t pid;
switch (signo) {
case SIGINT:
case SIGTERM:
run = 0;
break;
case SIGHUP:
rescan = 1;
break;
case SIGCHLD:
while ((pid = waitpid(-1, NULL, WNOHANG)) != -1)
;
break;
}
}
int main(void)
{
struct timespec stime;
struct sigaction act;
int timeout;
memset(&act, 0, sizeof(act));
act.sa_handler = sighandler;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
while (run) {
if (rescan == 1) {
cleanup_config();
read_config();
timeout = timeout_minutes(1);
rescan = 0;
} else {
runjobs();
timeout = calc_timeout();
}
stime.tv_sec = timeout;
stime.tv_nsec = 0;
while (nanosleep(&stime, &stime) != 0 && run && !rescan) {
if (errno != EINTR) {
perror("nanosleep");
break;
}
}
}
return EXIT_SUCCESS;
}