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
|
/*
* Copyright © 2010 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <termios.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <linux/major.h>
#include <sys/ioctl.h>
#include "compositor.h"
struct tty {
struct weston_compositor *compositor;
int fd;
struct termios terminal_attributes;
struct wl_event_source *input_source;
struct wl_event_source *enter_vt_source;
struct wl_event_source *leave_vt_source;
tty_vt_func_t vt_func;
};
static int on_enter_vt(int signal_number, void *data)
{
struct tty *tty = data;
ioctl(tty->fd, VT_RELDISP, VT_ACKACQ);
tty->vt_func(tty->compositor, TTY_ENTER_VT);
return 1;
}
static int
on_leave_vt(int signal_number, void *data)
{
struct tty *tty = data;
tty->vt_func(tty->compositor, TTY_LEAVE_VT);
ioctl(tty->fd, VT_RELDISP, 1);
return 1;
}
static int
on_tty_input(int fd, uint32_t mask, void *data)
{
struct tty *tty = data;
/* Ignore input to tty. We get keyboard events from evdev
*/
tcflush(tty->fd, TCIFLUSH);
return 1;
}
static int
try_open_vt(void)
{
int tty0, vt, fd;
char filename[16];
tty0 = open("/dev/tty0", O_WRONLY | O_CLOEXEC);
if (tty0 < 0) {
fprintf(stderr, "could not open tty0: %m\n");
return -1;
}
if (ioctl(tty0, VT_OPENQRY, &vt) < 0 || vt == -1) {
fprintf(stderr, "could not open tty0: %m\n");
close(tty0);
return -1;
}
close(tty0);
snprintf(filename, sizeof filename, "/dev/tty%d", vt);
fprintf(stderr, "compositor: using new vt %s\n", filename);
fd = open(filename, O_RDWR | O_NOCTTY | O_CLOEXEC);
if (fd < 0)
return fd;
if (ioctl(fd, VT_ACTIVATE, vt) < 0 ||
ioctl(fd, VT_WAITACTIVE, vt) < 0) {
fprintf(stderr, "failed to swtich to new vt\n");
close(fd);
return -1;
}
return fd;
}
struct tty *
tty_create(struct weston_compositor *compositor, tty_vt_func_t vt_func,
int tty_nr)
{
struct termios raw_attributes;
struct vt_mode mode = { 0 };
int ret;
struct tty *tty;
struct wl_event_loop *loop;
struct stat buf;
char filename[16];
tty = malloc(sizeof *tty);
if (tty == NULL)
return NULL;
memset(tty, 0, sizeof *tty);
tty->compositor = compositor;
tty->vt_func = vt_func;
if (tty_nr > 0) {
snprintf(filename, sizeof filename, "/dev/tty%d", tty_nr);
fprintf(stderr, "compositor: using %s\n", filename);
tty->fd = open(filename, O_RDWR | O_NOCTTY | O_CLOEXEC);
} else if (fstat(tty->fd, &buf) == 0 &&
major(buf.st_rdev) == TTY_MAJOR &&
minor(buf.st_rdev) > 0) {
tty->fd = fcntl(0, F_DUPFD_CLOEXEC, 0);
} else {
/* Fall back to try opening a new VT. This typically
* requires root. */
tty->fd = try_open_vt();
}
if (tty->fd <= 0) {
fprintf(stderr, "failed to open tty: %m\n");
return NULL;
}
if (tcgetattr(tty->fd, &tty->terminal_attributes) < 0) {
fprintf(stderr, "could not get terminal attributes: %m\n");
return NULL;
}
/* Ignore control characters and disable echo */
raw_attributes = tty->terminal_attributes;
cfmakeraw(&raw_attributes);
/* Fix up line endings to be normal (cfmakeraw hoses them) */
raw_attributes.c_oflag |= OPOST | OCRNL;
if (tcsetattr(tty->fd, TCSANOW, &raw_attributes) < 0)
fprintf(stderr, "could not put terminal into raw mode: %m\n");
loop = wl_display_get_event_loop(compositor->wl_display);
tty->input_source =
wl_event_loop_add_fd(loop, tty->fd,
WL_EVENT_READABLE, on_tty_input, tty);
ret = ioctl(tty->fd, KDSETMODE, KD_GRAPHICS);
if (ret) {
fprintf(stderr, "failed to set KD_GRAPHICS mode on tty: %m\n");
return NULL;
}
tty->compositor->focus = 1;
mode.mode = VT_PROCESS;
mode.relsig = SIGUSR1;
mode.acqsig = SIGUSR2;
if (ioctl(tty->fd, VT_SETMODE, &mode) < 0) {
fprintf(stderr, "failed to take control of vt handling\n");
return NULL;
}
tty->leave_vt_source =
wl_event_loop_add_signal(loop, SIGUSR1, on_leave_vt, tty);
tty->enter_vt_source =
wl_event_loop_add_signal(loop, SIGUSR2, on_enter_vt, tty);
return tty;
}
void
tty_destroy(struct tty *tty)
{
if(!tty)
return;
if (ioctl(tty->fd, KDSETMODE, KD_TEXT))
fprintf(stderr,
"failed to set KD_TEXT mode on tty: %m\n");
if (tcsetattr(tty->fd, TCSANOW, &tty->terminal_attributes) < 0)
fprintf(stderr,
"could not restore terminal to canonical mode\n");
close(tty->fd);
free(tty);
}
|
