115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0-or-later
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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 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) 1992 Peter Orbaek <poe@daimi.aau.dk>
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* Copyright (C) 1992-1993 Rickard E. Faith <faith@cs.unc.edu>
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*
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* Set the function of the Ctrl-Alt-Del combination
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*/
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/reboot.h>
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#include "nls.h"
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#include "c.h"
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#include "closestream.h"
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#include "pathnames.h"
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#include "path.h"
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#define LINUX_REBOOT_CMD_CAD_ON 0x89ABCDEF
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#define LINUX_REBOOT_CMD_CAD_OFF 0x00000000
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s hard|soft\n"), program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fprintf(out, _("Set the function of the Ctrl-Alt-Del combination.\n"));
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fputs(USAGE_OPTIONS, out);
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fprintf(out, USAGE_HELP_OPTIONS(16));
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fprintf(out, USAGE_MAN_TAIL("ctrlaltdel(8)"));
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exit(EXIT_SUCCESS);
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}
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static int get_cad(void)
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{
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uint64_t val;
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if (ul_path_read_u64(NULL, &val, _PATH_PROC_CTRL_ALT_DEL) != 0)
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err(EXIT_FAILURE, _("cannot read %s"), _PATH_PROC_CTRL_ALT_DEL);
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switch (val) {
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case 0:
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fputs("soft\n", stdout);
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break;
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case 1:
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fputs("hard\n", stdout);
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break;
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default:
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printf("%s hard\n", _("implicit"));
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warnx(_("unexpected value in %s: %ju"), _PATH_PROC_CTRL_ALT_DEL, val);
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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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static int set_cad(const char *arg)
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{
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unsigned int cmd;
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if (!strcmp("hard", arg))
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cmd = LINUX_REBOOT_CMD_CAD_ON;
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else if (!strcmp("soft", arg))
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cmd = LINUX_REBOOT_CMD_CAD_OFF;
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else {
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warnx(_("unknown argument: %s"), arg);
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return EXIT_FAILURE;
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}
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if (reboot(cmd) < 0) {
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warn("reboot");
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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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int main(int argc, char **argv)
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{
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int ch, ret;
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static const struct option longopts[] = {
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{"version", no_argument, NULL, 'V'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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close_stdout_atexit();
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while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
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switch (ch) {
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case 'V':
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print_version(EXIT_SUCCESS);
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case 'h':
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usage();
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default:
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errtryhelp(EXIT_FAILURE);
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}
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if (argc < 2)
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ret = get_cad();
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else
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ret = set_cad(argv[1]);
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return ret;
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}
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