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
|
#include <dev/evdev/input.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/consio.h>
#include <sys/ioctl.h>
#include <sys/kbio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <termios.h>
#include <unistd.h>
#include <wayland-server.h>
#include <wlr/backend/session/interface.h>
#include <wlr/util/log.h>
#include "backend/session/direct-ipc.h"
#include "util/signal.h"
const struct session_impl session_direct;
struct direct_session {
struct wlr_session base;
int tty_fd;
int old_kbmode;
int sock;
pid_t child;
struct wl_event_source *vt_source;
};
static int direct_session_open(struct wlr_session *base, const char *path) {
struct direct_session *session = wl_container_of(base, session, base);
int fd = direct_ipc_open(session->sock, path);
if (fd < 0) {
wlr_log(WLR_ERROR, "Failed to open %s: %s%s", path, strerror(-fd),
fd == -EINVAL ? "; is another display server running?" : "");
return fd;
}
struct stat st;
if (fstat(fd, &st) < 0) {
close(fd);
return -errno;
}
return fd;
}
static void direct_session_close(struct wlr_session *base, int fd) {
struct direct_session *session = wl_container_of(base, session, base);
struct stat st;
if (fstat(fd, &st) < 0) {
wlr_log_errno(WLR_ERROR, "Stat failed");
close(fd);
return;
}
close(fd);
}
static bool direct_change_vt(struct wlr_session *base, unsigned vt) {
struct direct_session *session = wl_container_of(base, session, base);
return ioctl(session->tty_fd, VT_ACTIVATE, (int)vt) == 0;
}
static void direct_session_destroy(struct wlr_session *base) {
struct direct_session *session = wl_container_of(base, session, base);
struct vt_mode mode = {
.mode = VT_AUTO,
};
errno = 0;
ioctl(session->tty_fd, KDSKBMODE, session->old_kbmode);
ioctl(session->tty_fd, KDSETMODE, KD_TEXT);
ioctl(session->tty_fd, VT_SETMODE, &mode);
if (errno) {
wlr_log(WLR_ERROR, "Failed to restore tty");
}
direct_ipc_finish(session->sock, session->child);
close(session->sock);
wl_event_source_remove(session->vt_source);
close(session->tty_fd);
free(session);
}
static int vt_handler(int signo, void *data) {
struct direct_session *session = data;
if (session->base.active) {
session->base.active = false;
wlr_signal_emit_safe(&session->base.session_signal, session);
ioctl(session->tty_fd, VT_RELDISP, 1);
} else {
ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
session->base.active = true;
wlr_signal_emit_safe(&session->base.session_signal, session);
}
return 1;
}
static bool setup_tty(struct direct_session *session, struct wl_display *display) {
int fd = -1, tty = -1, tty0_fd = -1;
if ((tty0_fd = open("/dev/ttyv0", O_RDWR | O_CLOEXEC)) < 0) {
wlr_log_errno(WLR_ERROR, "Could not open /dev/ttyv0 to find a free vt");
goto error;
}
if (ioctl(tty0_fd, VT_OPENQRY, &tty) != 0) {
wlr_log_errno(WLR_ERROR, "Could not find a free vt");
goto error;
}
close(tty0_fd);
char tty_path[64];
snprintf(tty_path, sizeof(tty_path), "/dev/ttyv%d", tty - 1);
wlr_log(WLR_INFO, "Using tty %s", tty_path);
fd = open(tty_path, O_RDWR | O_NOCTTY | O_CLOEXEC);
if (fd == -1) {
wlr_log_errno(WLR_ERROR, "Cannot open tty");
return false;
}
ioctl(fd, VT_ACTIVATE, tty);
ioctl(fd, VT_WAITACTIVE, tty);
int old_kbmode;
if (ioctl(fd, KDGKBMODE, &old_kbmode)) {
wlr_log_errno(WLR_ERROR, "Failed to read tty %d keyboard mode", tty);
goto error;
}
if (ioctl(fd, KDSKBMODE, K_CODE)) {
wlr_log_errno(WLR_ERROR, "Failed to set keyboard mode K_CODE on tty %d", tty);
goto error;
}
if (ioctl(fd, KDSETMODE, KD_GRAPHICS)) {
wlr_log_errno(WLR_ERROR, "Failed to set graphics mode on tty %d", tty);
goto error;
}
struct vt_mode mode = {
.mode = VT_PROCESS,
.relsig = SIGUSR2,
.acqsig = SIGUSR2,
.frsig = SIGIO, // has to be set
};
if (ioctl(fd, VT_SETMODE, &mode) < 0) {
wlr_log(WLR_ERROR, "Failed to take control of tty %d", tty);
goto error;
}
struct wl_event_loop *loop = wl_display_get_event_loop(display);
session->vt_source = wl_event_loop_add_signal(loop, SIGUSR2,
vt_handler, session);
if (!session->vt_source) {
goto error;
}
session->base.vtnr = tty;
session->tty_fd = fd;
session->old_kbmode = old_kbmode;
return true;
error:
// Drop back to tty 1, better than hanging in a useless blank console
ioctl(fd, VT_ACTIVATE, 1);
close(fd);
return false;
}
static struct wlr_session *direct_session_create(struct wl_display *disp) {
struct direct_session *session = calloc(1, sizeof(*session));
if (!session) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
session->sock = direct_ipc_init(&session->child);
if (session->sock == -1) {
goto error_session;
}
if (!setup_tty(session, disp)) {
goto error_ipc;
}
wlr_log(WLR_INFO, "Successfully loaded direct session");
snprintf(session->base.seat, sizeof(session->base.seat), "seat0");
session->base.impl = &session_direct;
return &session->base;
error_ipc:
direct_ipc_finish(session->sock, session->child);
close(session->sock);
error_session:
free(session);
return NULL;
}
const struct session_impl session_direct = {
.create = direct_session_create,
.destroy = direct_session_destroy,
.open = direct_session_open,
.close = direct_session_close,
.change_vt = direct_change_vt,
};
|
