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
|
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include "vt.h"
/* -------------------------------------------------------------------- */
#define CONSOLE_ACTIVE 0
#define CONSOLE_REL_REQ 1
#define CONSOLE_INACTIVE 2
#define CONSOLE_ACQ_REQ 3
int console_visible = 1;
extern int debug;
static int switch_last;
static int console_switch_state = CONSOLE_ACTIVE;
static bool console_switching_active;
static int kd_mode;
static struct vt_mode vt_mode;
static struct vt_mode vt_omode;
static int orig_vt_no = 0;
static void (*console_redraw)(void);
static void console_switch_signal(int signal)
{
if (signal == SIGUSR1) {
/* release */
console_switch_state = CONSOLE_REL_REQ;
if (debug)
write(2,"vt: SIGUSR1\n",12);
}
if (signal == SIGUSR2) {
/* acquisition */
console_switch_state = CONSOLE_ACQ_REQ;
if (debug)
write(2,"vt: SIGUSR2\n",12);
}
}
static void console_switch_release(void)
{
ioctl(STDIN_FILENO, VT_RELDISP, 1);
console_switch_state = CONSOLE_INACTIVE;
if (debug)
write(2,"vt: release\n",12);
}
static void console_switch_acquire(void)
{
ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ);
console_switch_state = CONSOLE_ACTIVE;
if (debug)
write(2,"vt: acquire\n",12);
}
int console_switch_init(void (*redraw)(void))
{
struct sigaction act,old;
console_redraw = redraw;
memset(&act,0,sizeof(act));
act.sa_handler = console_switch_signal;
sigemptyset(&act.sa_mask);
sigaction(SIGUSR1,&act,&old);
sigaction(SIGUSR2,&act,&old);
if (-1 == ioctl(STDIN_FILENO, VT_GETMODE, &vt_omode)) {
perror("ioctl VT_GETMODE");
return -1;
}
if (-1 == ioctl(STDIN_FILENO, KDGETMODE, &kd_mode)) {
perror("ioctl KDGETMODE");
return -1;
}
if (-1 == ioctl(STDIN_FILENO, VT_GETMODE, &vt_mode)) {
perror("ioctl VT_GETMODE");
return -1;
}
vt_mode.mode = VT_PROCESS;
vt_mode.waitv = 0;
vt_mode.relsig = SIGUSR1;
vt_mode.acqsig = SIGUSR2;
if (-1 == ioctl(STDIN_FILENO, VT_SETMODE, &vt_mode)) {
perror("ioctl VT_SETMODE");
return -1;
}
if (-1 == ioctl(STDIN_FILENO, KDSETMODE, KD_GRAPHICS)) {
ioctl(STDIN_FILENO, VT_SETMODE, &vt_omode);
perror("ioctl KDSETMODE");
return -1;
}
console_switching_active = true;
return 0;
}
void console_switch_cleanup(void)
{
if (!console_switching_active)
return;
if (-1 == ioctl(STDIN_FILENO, KDSETMODE, kd_mode))
perror("ioctl KDSETMODE");
if (-1 == ioctl(STDIN_FILENO, VT_SETMODE, &vt_omode))
perror("ioctl VT_SETMODE");
console_switching_active = false;
}
int check_console_switch(void)
{
if (!console_switching_active)
return 0;
if (switch_last == console_switch_state)
return 0;
switch (console_switch_state) {
case CONSOLE_REL_REQ:
console_switch_release();
case CONSOLE_INACTIVE:
console_visible = 0;
break;
case CONSOLE_ACQ_REQ:
console_switch_acquire();
case CONSOLE_ACTIVE:
console_visible = 1;
console_redraw();
break;
default:
break;
}
switch_last = console_switch_state;
return 1;
}
void console_set_vt(int vtno)
{
struct vt_stat vts;
char vtname[12];
if (vtno < 0) {
if (-1 == ioctl(STDIN_FILENO, VT_OPENQRY, &vtno) || vtno == -1) {
perror("ioctl VT_OPENQRY");
exit(1);
}
}
vtno &= 0xff;
sprintf(vtname, "/dev/tty%d", vtno);
chown(vtname, getuid(), getgid());
if (-1 == access(vtname, R_OK | W_OK)) {
fprintf(stderr,"access %s: %s\n",vtname,strerror(errno));
exit(1);
}
/* switch controlling tty */
switch (fork()) {
case 0:
break;
case -1:
perror("fork");
exit(1);
default:
exit(0);
}
close(0);
close(1);
close(2);
setsid();
open(vtname,O_RDWR);
dup(0);
dup(0);
if (-1 == ioctl(STDIN_FILENO,VT_GETSTATE, &vts)) {
perror("ioctl VT_GETSTATE");
exit(1);
}
orig_vt_no = vts.v_active;
if (-1 == ioctl(STDIN_FILENO,VT_ACTIVATE, vtno)) {
perror("ioctl VT_ACTIVATE");
exit(1);
}
if (-1 == ioctl(STDIN_FILENO,VT_WAITACTIVE, vtno)) {
perror("ioctl VT_WAITACTIVE");
exit(1);
}
}
void console_restore_vt(void)
{
if (!orig_vt_no)
return;
if (ioctl(STDIN_FILENO, VT_ACTIVATE, orig_vt_no) < 0)
perror("ioctl VT_ACTIVATE");
if (ioctl(STDIN_FILENO, VT_WAITACTIVE, orig_vt_no) < 0)
perror("ioctl VT_WAITACTIVE");
}
/* Hmm. radeonfb needs this. matroxfb doesn't. */
int console_activate_current(void)
{
struct vt_stat vts;
if (-1 == ioctl(STDIN_FILENO, VT_GETSTATE, &vts)) {
perror("ioctl VT_GETSTATE");
return -1;
}
if (-1 == ioctl(STDIN_FILENO, VT_ACTIVATE, vts.v_active)) {
perror("ioctl VT_ACTIVATE");
return -1;
}
if (-1 == ioctl(STDIN_FILENO, VT_WAITACTIVE, vts.v_active)) {
perror("ioctl VT_WAITACTIVE");
return -1;
}
return 0;
}
|
