mirror of
https://github.com/pygos/init.git
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143 lines
3.5 KiB
C
143 lines
3.5 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 <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/reboot.h>
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#include <linux/reboot.h>
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#include "util.h"
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#define FL_FORCE 0x01
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#define FL_NOSYNC 0x02
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, 'V' },
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{ "poweroff", no_argument, NULL, 'p' },
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{ "reboot", no_argument, NULL, 'r' },
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{ "force", no_argument, NULL, 'f' },
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{ "no-sync", no_argument, NULL, 'n' },
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{ NULL, 0, NULL, 0 },
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};
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static const char *shortopt = "hVprfn";
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static const char *defact_str = "power-off";
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static int defact = RB_POWER_OFF;
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static NORETURN void usage(const char *progname, int status)
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{
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fprintf(status == EXIT_SUCCESS ? stdout : stderr,
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"%s [OPTIONS...]\n\n"
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"Perform a system shutdown or reboot.\n\n"
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" -h, --help Display this help text and exit.\n"
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" -V, --version Display version information and exit.\n"
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" -p, --poweroff Power-off the machine.\n"
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" -r, --reboot Reboot the machine.\n"
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" -f, --force Force immediate power-off or reboot. Do not contact the\n"
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" init system.\n"
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" -n, --no-sync Don't sync storage media before power-off or reboot.\n\n"
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"If no option is specified, the default action is %s.\n",
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progname, defact_str);
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exit(status);
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}
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static NORETURN void version(const char *progname)
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{
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fprintf(stdout,
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"%s (Pygos init) %s\n"
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"Copyright (C) 2018 David Oberhollenzer\n"
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"License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n"
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"This is free software: you are free to change and redistribute it.\n"
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"There is NO WARRANTY, to the extent permitted by law.\n",
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progname, PACKAGE_VERSION);
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exit(EXIT_SUCCESS);
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}
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int main(int argc, char **argv)
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{
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int c, ret, flags = 0;
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char *ptr;
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ptr = strrchr(argv[0], '/');
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ptr = (ptr == NULL) ? argv[0] : (ptr + 1);
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if (strcmp(ptr, "reboot") == 0) {
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defact_str = "reboot";
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defact = RB_AUTOBOOT;
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}
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while (1) {
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c = getopt_long(argc, argv, shortopt, options, NULL);
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if (c == -1)
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break;
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switch (c) {
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case 'f':
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flags |= FL_FORCE;
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break;
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case 'n':
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flags |= FL_NOSYNC;
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break;
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case 'p':
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defact = RB_POWER_OFF;
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break;
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case 'r':
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defact = RB_AUTOBOOT;
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break;
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case 'V':
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version(ptr);
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case 'h':
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usage(ptr, EXIT_SUCCESS);
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default:
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usage(ptr, EXIT_FAILURE);
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}
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}
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if (flags & FL_FORCE) {
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if (!(flags & FL_NOSYNC))
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sync();
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reboot(defact);
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perror("reboot system call");
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return EXIT_FAILURE;
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}
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switch (defact) {
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case RB_AUTOBOOT:
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ret = kill(1, SIGINT);
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break;
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case RB_POWER_OFF:
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ret = kill(1, SIGTERM);
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break;
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default:
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return EXIT_SUCCESS;
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}
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if (ret) {
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perror("sending signal to init");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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