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#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 "vt.h"
/* -------------------------------------------------------------------- */
#ifdef SYSTEM_LINUX
#include <linux/kd.h>
#include <linux/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 void (*console_suspend)(void);
static void (*console_resume)(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 (*suspend)(void),
void (*resume)(void))
{
struct sigaction act,old;
console_suspend = suspend;
console_resume = resume;
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_visible = 0;
console_suspend();
console_switch_release();
case CONSOLE_INACTIVE:
break;
case CONSOLE_ACQ_REQ:
console_switch_acquire();
case CONSOLE_ACTIVE:
console_visible = 1;
console_resume();
break;
default:
break;
}
switch_last = console_switch_state;
return 1;
}
/* 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;
}
/* -------------------------------------------------------------------- */
#else /* SYSTEM_LINUX */
int console_visible = 1;
int console_switch_init(void (*suspend)(void),
void (*resume)(void))
{
return -1;
}
void console_switch_cleanup(void)
{
}
int check_console_switch(void)
{
return 0;
}
#endif /* SYSTEM_LINUX */
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