File: showkey.c

package info (click to toggle)
kbd 2.0.4-4
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 14,136 kB
  • sloc: sh: 12,838; ansic: 12,531; pascal: 472; lex: 466; makefile: 394; yacc: 356; perl: 126; sed: 16
file content (279 lines) | stat: -rw-r--r-- 6,278 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <getopt.h>
#include <fcntl.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <linux/kd.h>
#include <linux/keyboard.h>
#include "getfd.h"
#include "kbd_error.h"
#include "nls.h"
#include "version.h"

int tmp; /* for debugging */

int fd;
int oldkbmode;
struct termios old;

/*
 * version 0.81 of showkey would restore kbmode unconditially to XLATE,
 * thus making the console unusable when it was called under X.
 */
static void
get_mode(void)
{
	char *m;

	if (ioctl(fd, KDGKBMODE, &oldkbmode)) {
		kbd_error(EXIT_FAILURE, errno, "ioctl KDGKBMODE");
	}
	switch (oldkbmode) {
		case K_RAW:
			m = "RAW";
			break;
		case K_XLATE:
			m = "XLATE";
			break;
		case K_MEDIUMRAW:
			m = "MEDIUMRAW";
			break;
		case K_UNICODE:
			m = "UNICODE";
			break;
		default:
			m = _("?UNKNOWN?");
			break;
	}
	printf(_("kb mode was %s\n"), m);
	if (oldkbmode != K_XLATE) {
		printf(_("[ if you are trying this under X, it might not work\n"
		         "since the X server is also reading /dev/console ]\n"));
	}
	printf("\n");
}

static void
clean_up(void)
{
	if (ioctl(fd, KDSKBMODE, oldkbmode)) {
		kbd_error(EXIT_FAILURE, errno, "ioctl KDSKBMODE");
	}
	if (tcsetattr(fd, 0, &old) == -1)
		kbd_warning(errno, "tcsetattr");
	close(fd);
}

static void __attribute__((noreturn))
die(int x)
{
	printf(_("caught signal %d, cleaning up...\n"), x);
	clean_up();
	exit(EXIT_FAILURE);
}

static void __attribute__((noreturn))
watch_dog(int x __attribute__((unused)))
{
	clean_up();
	exit(EXIT_SUCCESS);
}

static void __attribute__((noreturn))
usage(void)
{
	fprintf(stderr, _(
	                    "showkey version %s\n\n"
	                    "usage: showkey [options...]\n"
	                    "\n"
	                    "valid options are:\n"
	                    "\n"
	                    "	-h --help	display this help text\n"
	                    "	-a --ascii	display the decimal/octal/hex values of the keys\n"
	                    "	-s --scancodes	display only the raw scan-codes\n"
	                    "	-k --keycodes	display only the interpreted keycodes (default)\n"
	                    "	-V --version	print version number\n"),
	        PACKAGE_VERSION);
	exit(EXIT_FAILURE);
}

int main(int argc, char *argv[])
{
	const char *short_opts          = "haskV";
	const struct option long_opts[] = {
		{ "help", no_argument, NULL, 'h' },
		{ "ascii", no_argument, NULL, 'a' },
		{ "scancodes", no_argument, NULL, 's' },
		{ "keycodes", no_argument, NULL, 'k' },
		{ "version", no_argument, NULL, 'V' },
		{ NULL, 0, NULL, 0 }
	};
	int c;
	int show_keycodes = 1;
	int print_ascii   = 0;

	struct termios new;
	unsigned char buf[18]; /* divisible by 3 */
	int i, n;

	set_progname(argv[0]);

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE_NAME, LOCALEDIR);
	textdomain(PACKAGE_NAME);

	while ((c = getopt_long(argc, argv,
	                        short_opts, long_opts, NULL)) != -1) {
		switch (c) {
			case 's':
				show_keycodes = 0;
				break;
			case 'k':
				show_keycodes = 1;
				break;
			case 'a':
				print_ascii = 1;
				break;
			case 'V':
				print_version_and_exit();
			case 'h':
			case '?':
				usage();
		}
	}

	if (optind < argc)
		usage();

	if (print_ascii) {
		/* no mode and signal and timer stuff - just read stdin */
		fd = 0;

		if (tcgetattr(fd, &old) == -1)
			kbd_warning(errno, "tcgetattr");
		if (tcgetattr(fd, &new) == -1)
			kbd_warning(errno, "tcgetattr");

		new.c_lflag &= ~(ICANON | ISIG);
		new.c_lflag |= (ECHO | ECHOCTL);
		new.c_iflag     = 0;
		new.c_cc[VMIN]  = 1;
		new.c_cc[VTIME] = 0;

		if (tcsetattr(fd, TCSAFLUSH, &new) == -1)
			kbd_warning(errno, "tcgetattr");
		printf(_("\nPress any keys - "
		         "Ctrl-D will terminate this program\n\n"));

		while (1) {
			n = read(fd, buf, 1);
			if (n == 1)
				printf(" \t%3d 0%03o 0x%02x\n",
				       buf[0], buf[0], buf[0]);
			if (n != 1 || buf[0] == 04)
				break;
		}

		if (tcsetattr(fd, 0, &old) == -1)
			kbd_warning(errno, "tcsetattr");
		return EXIT_SUCCESS;
	}

	if ((fd = getfd(NULL)) < 0)
		kbd_error(EXIT_FAILURE, 0, _("Couldn't get a file descriptor referring to the console"));

	/* the program terminates when there is no input for 10 secs */
	signal(SIGALRM, watch_dog);

	/*
	  if we receive a signal, we want to exit nicely, in
	  order not to leave the keyboard in an unusable mode
	*/
	signal(SIGHUP, die);
	signal(SIGINT, die);
	signal(SIGQUIT, die);
	signal(SIGILL, die);
	signal(SIGTRAP, die);
	signal(SIGABRT, die);
	signal(SIGIOT, die);
	signal(SIGFPE, die);
	signal(SIGKILL, die);
	signal(SIGUSR1, die);
	signal(SIGSEGV, die);
	signal(SIGUSR2, die);
	signal(SIGPIPE, die);
	signal(SIGTERM, die);
#ifdef SIGSTKFLT
	signal(SIGSTKFLT, die);
#endif
	signal(SIGCHLD, die);
	signal(SIGCONT, die);
	signal(SIGSTOP, die);
	signal(SIGTSTP, die);
	signal(SIGTTIN, die);
	signal(SIGTTOU, die);

	get_mode();
	if (tcgetattr(fd, &old) == -1)
		kbd_warning(errno, "tcgetattr");
	if (tcgetattr(fd, &new) == -1)
		kbd_warning(errno, "tcgetattr");

	new.c_lflag &= ~(ICANON | ECHO | ISIG);
	new.c_iflag     = 0;
	new.c_cc[VMIN]  = sizeof(buf);
	new.c_cc[VTIME] = 1; /* 0.1 sec intercharacter timeout */

	if (tcsetattr(fd, TCSAFLUSH, &new) == -1)
		kbd_warning(errno, "tcsetattr");
	if (ioctl(fd, KDSKBMODE, show_keycodes ? K_MEDIUMRAW : K_RAW)) {
		kbd_error(EXIT_FAILURE, errno, "ioctl KDSKBMODE");
	}

	printf(_("press any key (program terminates 10s after last keypress)...\n"));

	/* show scancodes */
	if (!show_keycodes) {
		while (1) {
			alarm(10);
			n = read(fd, buf, sizeof(buf));
			for (i = 0; i < n; i++)
				printf("0x%02x ", buf[i]);
			printf("\n");
		}
		clean_up();
		return EXIT_SUCCESS;
	}

	/* show keycodes - 2.6 allows 3-byte reports */
	while (1) {
		alarm(10);
		n = read(fd, buf, sizeof(buf));
		i = 0;
		while (i < n) {
			int kc;
			char *s;

			s = (buf[i] & 0x80) ? _("release") : _("press");

			if (i + 2 < n && (buf[i] & 0x7f) == 0 && (buf[i + 1] & 0x80) != 0 && (buf[i + 2] & 0x80) != 0) {
				kc = ((buf[i + 1] & 0x7f) << 7) |
				     (buf[i + 2] & 0x7f);
				i += 3;
			} else {
				kc = (buf[i] & 0x7f);
				i++;
			}
			printf(_("keycode %3d %s\n"), kc, s);
		}
	}

	clean_up();
	return EXIT_SUCCESS;
}