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#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);
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;
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;
}
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