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/* vt.c - VT specific routines
* most of these are simplified versions of routines that can
* be found in the kbd package.
*
* Released under GPL V2.
* (C) 2006 Stefan Seyfried <seife@suse.de>
*/
#include "config.h"
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/kd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/vt.h>
int is_a_console(int fd)
{
char arg;
arg = 0;
return (ioctl(fd, KDGKBTYPE, &arg) == 0
&& ((arg == KB_101) || (arg == KB_84)));
}
int open_a_console(const char *fnam)
{
int fd;
fd = open(fnam, O_RDWR);
if (fd < 0)
return -1;
if (!is_a_console(fd)) {
close(fd);
return -1;
}
return fd;
}
int getconsolefd(void)
{
int fd;
fd = open_a_console("/dev/tty");
if (fd >= 0)
return fd;
fd = open_a_console("/dev/tty0");
if (fd >= 0)
return fd;
fd = open_a_console("/dev/vc/0");
if (fd >= 0)
return fd;
fd = open_a_console("/dev/console");
if (fd >= 0)
return fd;
for (fd = 0; fd < 3; fd++)
if (is_a_console(fd))
return fd;
return -1;
}
int fgconsole(void)
{
int fd;
struct vt_stat vtstat;
fd = getconsolefd();
if (fd < 0) {
perror("fgconsole: getconsolefd");
return -1;
}
if (ioctl(fd, VT_GETSTATE, &vtstat)) {
perror("fgconsole: VT_GETSTATE");
return -1;
}
return vtstat.v_active;
}
int chvt(int num)
{
#define USER_WAIT_SLEEP_US 100000
#define USER_WAIT_MAX_ITERATIONS 50
int i, fd, active = 0;
for (i = 0; i < USER_WAIT_MAX_ITERATIONS; i++) {
if (fgconsole() == num) {
active = 1;
break;
}
fd = getconsolefd();
if (ioctl(fd, VT_ACTIVATE, num)) {
perror("chvt: VT_ACTIVATE");
}
usleep(USER_WAIT_SLEEP_US);
}
return active;
}
int is_framebuffer(void)
{
return !access("/sys/class/graphics/fb0", F_OK);
}
char *get_fbname(void)
{
int fd, len;
/* id of the driver can be 16bytes long + cr appended by sysfs */
char *id = malloc(17);
fd = open("/sys/class/graphics/fb0/name", O_RDONLY);
if (fd < 0) {
strcpy(id, "error");
goto out;
}
len = read(fd, id, 17);
if (len <= 0)
strcpy(id, "error");
else
/* strip the cr appended by sysfs */
id[len-1] = '\0';
close(fd);
out:
return id;
}
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