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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <errno.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/ioctl.h>
static int activate_thread_switch_vc;
static void *activate_thread(void *arg)
{
int res;
int fd = (int)arg;
while(activate_thread_switch_vc >= 0) {
do {
res = ioctl(fd, VT_ACTIVATE, (void*)activate_thread_switch_vc);
} while(res < 0 && errno == EINTR);
if (res < 0) {
fprintf(stderr, "ioctl( vcfd, VT_ACTIVATE, vtnum) failed, %d %d %s for %d\n", res, errno, strerror(errno), activate_thread_switch_vc);
}
if(activate_thread_switch_vc >= 0)
sleep(1);
}
return NULL;
}
int setconsole_main(int argc, char *argv[])
{
int c;
int fd;
int res;
int mode = -1;
int new_vc = 0;
int close_vc = 0;
int switch_vc = -1;
int printvc = 0;
char *ttydev = "/dev/tty0";
do {
c = getopt(argc, argv, "d:gtncv:poh");
if (c == EOF)
break;
switch (c) {
case 'd':
ttydev = optarg;
break;
case 'g':
if(mode == KD_TEXT) {
fprintf(stderr, "%s: cannot specify both -g and -t\n", argv[0]);
exit(1);
}
mode = KD_GRAPHICS;
break;
case 't':
if(mode == KD_GRAPHICS) {
fprintf(stderr, "%s: cannot specify both -g and -t\n", argv[0]);
exit(1);
}
mode = KD_TEXT;
break;
case 'n':
new_vc = 1;
break;
case 'c':
close_vc = 1;
break;
case 'v':
switch_vc = atoi(optarg);
break;
case 'p':
printvc |= 1;
break;
case 'o':
printvc |= 2;
break;
case 'h':
fprintf(stderr, "%s [-d <dev>] [-v <vc>] [-gtncpoh]\n"
" -d <dev> Use <dev> instead of /dev/tty0\n"
" -v <vc> Switch to virtual console <vc>\n"
" -g Switch to graphics mode\n"
" -t Switch to text mode\n"
" -n Create and switch to new virtual console\n"
" -c Close unused virtual consoles\n"
" -p Print new virtual console\n"
" -o Print old virtual console\n"
" -h Print help\n", argv[0]);
return -1;
case '?':
fprintf(stderr, "%s: invalid option -%c\n",
argv[0], optopt);
exit(1);
}
} while (1);
if(mode == -1 && new_vc == 0 && close_vc == 0 && switch_vc == -1 && printvc == 0) {
fprintf(stderr,"%s [-d <dev>] [-v <vc>] [-gtncpoh]\n", argv[0]);
return -1;
}
fd = open(ttydev, O_RDWR | O_SYNC);
if (fd < 0) {
fprintf(stderr, "cannot open %s\n", ttydev);
return -1;
}
if ((printvc && !new_vc) || (printvc & 2)) {
struct vt_stat vs;
res = ioctl(fd, VT_GETSTATE, &vs);
if (res < 0) {
fprintf(stderr, "ioctl(vcfd, VT_GETSTATE, &vs) failed, %d\n", res);
}
printf("%d\n", vs.v_active);
}
if (new_vc) {
int vtnum;
res = ioctl(fd, VT_OPENQRY, &vtnum);
if (res < 0 || vtnum == -1) {
fprintf(stderr, "ioctl(vcfd, VT_OPENQRY, &vtnum) failed, res %d, vtnum %d\n", res, vtnum);
}
switch_vc = vtnum;
}
if (switch_vc != -1) {
pthread_t thread;
pthread_attr_t attr;
activate_thread_switch_vc = switch_vc;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_create(&thread, &attr, activate_thread, (void*)fd);
do {
res = ioctl(fd, VT_WAITACTIVE, (void*)switch_vc);
} while(res < 0 && errno == EINTR);
activate_thread_switch_vc = -1;
if (res < 0) {
fprintf(stderr, "ioctl( vcfd, VT_WAITACTIVE, vtnum) failed, %d %d %s for %d\n", res, errno, strerror(errno), switch_vc);
}
if(printvc & 1)
printf("%d\n", switch_vc);
close(fd);
fd = open(ttydev, O_RDWR | O_SYNC);
if (fd < 0) {
fprintf(stderr, "cannot open %s\n", ttydev);
return -1;
}
}
if (close_vc) {
res = ioctl(fd, VT_DISALLOCATE, 0);
if (res < 0) {
fprintf(stderr, "ioctl(vcfd, VT_DISALLOCATE, 0) failed, %d\n", res);
}
}
if (mode != -1) {
if (ioctl(fd, KDSETMODE, (void*)mode) < 0) {
fprintf(stderr, "KDSETMODE %d failed\n", mode);
return -1;
}
}
return 0;
}
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