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