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https://github.com/pygos/init.git
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135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "gcrond.h"
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static crontab_t *jobs;
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static sig_atomic_t run = 1;
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static sig_atomic_t rescan = 1;
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static void read_config(void)
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{
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if (cronscan(GCRONDIR, &jobs)) {
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fputs("Error reading configuration. Continuing anyway.\n",
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stderr);
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}
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}
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static void cleanup_config(void)
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{
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crontab_t *t;
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while (jobs != NULL) {
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t = jobs;
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jobs = jobs->next;
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delcron(t);
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}
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}
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static int calc_timeout(void)
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{
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time_t now = time(NULL), future;
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struct tm tmstruct;
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crontab_t mask, *t;
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int minutes;
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for (minutes = 0; minutes < 120; ++minutes) {
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future = now + minutes * 60;
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localtime_r(&future, &tmstruct);
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cron_tm_to_mask(&mask, &tmstruct);
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for (t = jobs; t != NULL; t = t->next) {
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if (cron_should_run(t, &mask))
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goto out;
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}
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}
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out:
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return minutes ? minutes * 60 : 60;
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}
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static void runjobs(void)
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{
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time_t now = time(NULL);
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struct tm tmstruct;
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crontab_t mask, *t;
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localtime_r(&now, &tmstruct);
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cron_tm_to_mask(&mask, &tmstruct);
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for (t = jobs; t != NULL; t = t->next) {
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if (cron_should_run(t, &mask))
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runjob(t);
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}
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}
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static void sighandler(int signo)
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{
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pid_t pid;
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switch (signo) {
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case SIGINT:
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case SIGTERM:
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run = 0;
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break;
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case SIGHUP:
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rescan = 1;
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break;
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case SIGCHLD:
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while ((pid = waitpid(-1, NULL, WNOHANG)) != -1)
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;
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break;
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}
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}
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int main(void)
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{
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struct timespec stime;
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struct sigaction act;
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int timeout;
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memset(&act, 0, sizeof(act));
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act.sa_handler = sighandler;
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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sigaction(SIGHUP, &act, NULL);
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sigaction(SIGCHLD, &act, NULL);
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while (run) {
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if (rescan == 1) {
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cleanup_config();
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read_config();
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timeout = 60;
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rescan = 0;
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} else {
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runjobs();
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timeout = calc_timeout();
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}
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stime.tv_sec = timeout;
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stime.tv_nsec = 0;
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while (nanosleep(&stime, &stime) != 0 && run && !rescan) {
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if (errno != EINTR) {
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perror("nanosleep");
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break;
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}
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}
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}
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return EXIT_SUCCESS;
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}
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