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
|
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/serial.h>
struct speeds
{
speed_t speed;
unsigned long value;
};
struct speeds speed_map[] =
{
{B50, 50},
{B75, 75},
{B110, 110},
{B134, 134},
{B150, 150},
{B200, 200},
{B300, 300},
{B600, 600},
{B1200, 1200},
{B1800, 1800},
{B2400, 2400},
{B4800, 4800},
{B9600, 9600},
{B19200, 19200},
{B38400, 38400},
#ifdef B57600
{B57600, 57600},
#endif
#ifdef B115200
{B115200, 115200},
#endif
#ifdef B230400
{B230400, 230400},
#endif
#ifdef B460800
{B460800, 460800},
#endif
{0, 0}
};
int termcmp(struct termios *a, struct termios *b) {
if (a->c_iflag != b->c_iflag || a->c_oflag != b->c_oflag ||
a->c_cflag != b->c_cflag || a->c_lflag != b->c_lflag ||
a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
return 1;
return memcmp(a->c_cc, b->c_cc, sizeof(a->c_cc));
}
int get_serial_speed(int fd) {
struct termios mode;
if (!tcgetattr(fd, &mode)) {
int i;
speed_t speed;
speed = cfgetospeed(&mode);
for (i = 0; speed_map[i].value != 0; i++)
if (speed_map[i].speed == speed)
return speed_map[i].value;
}
return 0;
}
int compare_termios_to_console(char *dev, int *speed) {
struct termios cmode, mode;
int fd, cfd;
cfd = open ("/dev/console", O_RDONLY);
tcgetattr(cfd, &cmode);
close(cfd);
fd = open(dev, O_RDONLY|O_NONBLOCK);
tcgetattr(fd, &mode);
if (!termcmp(&cmode, &mode)) {
*speed = get_serial_speed(fd);
close(fd);
return 1;
}
close(fd);
return 0;
}
char *check_serial_console(int *speed) {
int fd;
char *ret = NULL, *device;
char twelve = 12;
struct serial_struct si, si2;
memset(&si, 0, sizeof(si));
memset(&si2, 0, sizeof(si));
fd = open("/dev/console", O_RDWR);
if (ioctl (fd, TIOCLINUX, &twelve) >= 0)
goto out;
if (ioctl(fd, TIOCGSERIAL, &si) < 0)
goto out;
close(fd);
asprintf(&device, "ttyS%d", si.line);
fd = open(device, O_RDWR|O_NONBLOCK);
if (fd == -1)
goto out;
if (ioctl(fd, TIOCGSERIAL, &si2) < 0)
goto out;
if (memcmp(&si,&si2, sizeof(si)))
goto out;
*speed = get_serial_speed(fd);
ret = device;
out:
close(fd);
return ret;
}
int emit_console_event(char *dev, int speed) {
char *args[] = { "initctl", "emit", "--no-wait", "fedora.serial-console-available", NULL, NULL, NULL };
args[4] = dev;
if (speed)
asprintf(&args[5],"%d",speed);
execv("/sbin/initctl", args);
return 1;
}
int main(int argc, char **argv) {
char *device;
int speed;
if (argc < 2) {
printf("usage: console_check <device>\n");
exit(1);
}
chdir("/dev");
device = argv[1];
if (!strcmp(device, "console")) {
device = check_serial_console(&speed);
if (device)
return emit_console_event(device, speed);
} else if (compare_termios_to_console(device, &speed)) {
return emit_console_event(device, speed);
}
return 0;
}
|
