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Commit | Line | Data |
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6dbe3af9 | 1 | /* |
9abd5e4b KZ |
2 | * SPDX-License-Identifier: GPL-2.0-or-later |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * Copyright (C) 1992 Peter Orbaek <poe@daimi.aau.dk> | |
10 | * Copyright (C) 1992-1993 Rickard E. Faith <faith@cs.unc.edu> | |
11 | * | |
12 | * Set the function of the Ctrl-Alt-Del combination | |
6dbe3af9 | 13 | */ |
028f7ed8 | 14 | #include <getopt.h> |
6dbe3af9 | 15 | #include <stdio.h> |
66ee8158 | 16 | #include <stdlib.h> |
6dbe3af9 | 17 | #include <string.h> |
0c3e5202 | 18 | #include <errno.h> |
e52b58e6 CTV |
19 | #include <unistd.h> |
20 | #include <sys/reboot.h> | |
7eda085c | 21 | #include "nls.h" |
eb76ca98 | 22 | #include "c.h" |
efb8854f | 23 | #include "closestream.h" |
82cac348 | 24 | #include "pathnames.h" |
741d478e | 25 | #include "path.h" |
6dbe3af9 | 26 | |
e52b58e6 CTV |
27 | #define LINUX_REBOOT_CMD_CAD_ON 0x89ABCDEF |
28 | #define LINUX_REBOOT_CMD_CAD_OFF 0x00000000 | |
29 | ||
86be6a32 | 30 | static void __attribute__((__noreturn__)) usage(void) |
0c3e5202 | 31 | { |
86be6a32 RM |
32 | FILE *out = stdout; |
33 | fputs(USAGE_HEADER, out); | |
b73142b9 | 34 | fprintf(out, _(" %s hard|soft\n"), program_invocation_short_name); |
451dbcfa | 35 | |
86be6a32 | 36 | fputs(USAGE_SEPARATOR, out); |
8137c98f | 37 | fprintf(out, _("Set the function of the Ctrl-Alt-Del combination.\n")); |
451dbcfa | 38 | |
86be6a32 | 39 | fputs(USAGE_OPTIONS, out); |
bad4c729 MY |
40 | fprintf(out, USAGE_HELP_OPTIONS(16)); |
41 | fprintf(out, USAGE_MAN_TAIL("ctrlaltdel(8)")); | |
86be6a32 | 42 | exit(EXIT_SUCCESS); |
028f7ed8 SK |
43 | } |
44 | ||
82cac348 SK |
45 | static int get_cad(void) |
46 | { | |
9ce2fef0 KZ |
47 | uint64_t val; |
48 | ||
49 | if (ul_path_read_u64(NULL, &val, _PATH_PROC_CTRL_ALT_DEL) != 0) | |
50 | err(EXIT_FAILURE, _("cannot read %s"), _PATH_PROC_CTRL_ALT_DEL); | |
82cac348 | 51 | |
82cac348 SK |
52 | switch (val) { |
53 | case 0: | |
54 | fputs("soft\n", stdout); | |
55 | break; | |
56 | case 1: | |
57 | fputs("hard\n", stdout); | |
58 | break; | |
59 | default: | |
60 | printf("%s hard\n", _("implicit")); | |
741d478e | 61 | warnx(_("unexpected value in %s: %ju"), _PATH_PROC_CTRL_ALT_DEL, val); |
82cac348 SK |
62 | return EXIT_FAILURE; |
63 | } | |
64 | return EXIT_SUCCESS; | |
65 | } | |
66 | ||
67 | static int set_cad(const char *arg) | |
028f7ed8 | 68 | { |
8137c98f | 69 | unsigned int cmd; |
82cac348 SK |
70 | |
71 | if (geteuid()) { | |
72 | warnx(_("You must be root to set the Ctrl-Alt-Del behavior")); | |
73 | return EXIT_FAILURE; | |
74 | } | |
75 | if (!strcmp("hard", arg)) | |
76 | cmd = LINUX_REBOOT_CMD_CAD_ON; | |
77 | else if (!strcmp("soft", arg)) | |
78 | cmd = LINUX_REBOOT_CMD_CAD_OFF; | |
79 | else { | |
80 | warnx(_("unknown argument: %s"), arg); | |
81 | return EXIT_FAILURE; | |
82 | } | |
e52b58e6 | 83 | if (reboot(cmd) < 0) { |
dcb87944 | 84 | warn("reboot"); |
82cac348 SK |
85 | return EXIT_FAILURE; |
86 | } | |
87 | return EXIT_SUCCESS; | |
88 | } | |
89 | ||
90 | int main(int argc, char **argv) | |
91 | { | |
92 | int ch, ret; | |
028f7ed8 SK |
93 | static const struct option longopts[] = { |
94 | {"version", no_argument, NULL, 'V'}, | |
95 | {"help", no_argument, NULL, 'h'}, | |
96 | {NULL, 0, NULL, 0} | |
97 | }; | |
98 | ||
7eda085c KZ |
99 | setlocale(LC_ALL, ""); |
100 | bindtextdomain(PACKAGE, LOCALEDIR); | |
101 | textdomain(PACKAGE); | |
2c308875 | 102 | close_stdout_atexit(); |
6dbe3af9 | 103 | |
028f7ed8 SK |
104 | while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1) |
105 | switch (ch) { | |
106 | case 'V': | |
2c308875 | 107 | print_version(EXIT_SUCCESS); |
028f7ed8 | 108 | case 'h': |
86be6a32 | 109 | usage(); |
028f7ed8 | 110 | default: |
677ec86c | 111 | errtryhelp(EXIT_FAILURE); |
028f7ed8 SK |
112 | } |
113 | ||
8137c98f | 114 | if (argc < 2) |
82cac348 | 115 | ret = get_cad(); |
8137c98f | 116 | else |
82cac348 SK |
117 | ret = set_cad(argv[1]); |
118 | return ret; | |
0c3e5202 | 119 | } |