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/*
* Copyright © 2010 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <termios.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <linux/major.h>
#include <sys/ioctl.h>
#include "compositor.h"
struct tty {
struct weston_compositor *compositor;
int fd;
struct termios terminal_attributes;
struct wl_event_source *input_source;
struct wl_event_source *vt_source;
tty_vt_func_t vt_func;
int vt, starting_vt, has_vt;
};
static int vt_handler(int signal_number, void *data)
{
struct tty *tty = data;
if (tty->has_vt) {
tty->vt_func(tty->compositor, TTY_LEAVE_VT);
tty->has_vt = 0;
ioctl(tty->fd, VT_RELDISP, 1);
} else {
ioctl(tty->fd, VT_RELDISP, VT_ACKACQ);
tty->vt_func(tty->compositor, TTY_ENTER_VT);
tty->has_vt = 1;
}
return 1;
}
static int
on_tty_input(int fd, uint32_t mask, void *data)
{
struct tty *tty = data;
/* Ignore input to tty. We get keyboard events from evdev
*/
tcflush(tty->fd, TCIFLUSH);
return 1;
}
static int
try_open_vt(struct tty *tty)
{
int tty0, fd;
char filename[16];
struct vt_stat vts;
tty0 = open("/dev/tty0", O_WRONLY | O_CLOEXEC);
if (tty0 < 0) {
fprintf(stderr, "could not open tty0: %m\n");
return -1;
}
if (ioctl(tty0, VT_OPENQRY, &tty->vt) < 0 || tty->vt == -1) {
fprintf(stderr, "could not open tty0: %m\n");
close(tty0);
return -1;
}
close(tty0);
snprintf(filename, sizeof filename, "/dev/tty%d", tty->vt);
fprintf(stderr, "compositor: using new vt %s\n", filename);
fd = open(filename, O_RDWR | O_NOCTTY | O_CLOEXEC);
if (fd < 0)
return fd;
if (ioctl(fd, VT_GETSTATE, &vts) == 0)
tty->starting_vt = vts.v_active;
else
tty->starting_vt = tty->vt;
if (ioctl(fd, VT_ACTIVATE, tty->vt) < 0 ||
ioctl(fd, VT_WAITACTIVE, tty->vt) < 0) {
fprintf(stderr, "failed to swtich to new vt\n");
close(fd);
return -1;
}
return fd;
}
struct tty *
tty_create(struct weston_compositor *compositor, tty_vt_func_t vt_func,
int tty_nr)
{
struct termios raw_attributes;
struct vt_mode mode = { 0 };
int ret;
struct tty *tty;
struct wl_event_loop *loop;
struct stat buf;
char filename[16];
tty = malloc(sizeof *tty);
if (tty == NULL)
return NULL;
memset(tty, 0, sizeof *tty);
tty->compositor = compositor;
tty->vt_func = vt_func;
if (tty_nr > 0) {
snprintf(filename, sizeof filename, "/dev/tty%d", tty_nr);
fprintf(stderr, "compositor: using %s\n", filename);
tty->fd = open(filename, O_RDWR | O_NOCTTY | O_CLOEXEC);
} else if (fstat(tty->fd, &buf) == 0 &&
major(buf.st_rdev) == TTY_MAJOR &&
minor(buf.st_rdev) > 0) {
tty->fd = fcntl(0, F_DUPFD_CLOEXEC, 0);
} else {
/* Fall back to try opening a new VT. This typically
* requires root. */
tty->fd = try_open_vt(tty);
}
if (tty->fd <= 0) {
fprintf(stderr, "failed to open tty: %m\n");
return NULL;
}
if (tcgetattr(tty->fd, &tty->terminal_attributes) < 0) {
fprintf(stderr, "could not get terminal attributes: %m\n");
return NULL;
}
/* Ignore control characters and disable echo */
raw_attributes = tty->terminal_attributes;
cfmakeraw(&raw_attributes);
/* Fix up line endings to be normal (cfmakeraw hoses them) */
raw_attributes.c_oflag |= OPOST | OCRNL;
if (tcsetattr(tty->fd, TCSANOW, &raw_attributes) < 0)
fprintf(stderr, "could not put terminal into raw mode: %m\n");
loop = wl_display_get_event_loop(compositor->wl_display);
tty->input_source =
wl_event_loop_add_fd(loop, tty->fd,
WL_EVENT_READABLE, on_tty_input, tty);
ret = ioctl(tty->fd, KDSETMODE, KD_GRAPHICS);
if (ret) {
fprintf(stderr, "failed to set KD_GRAPHICS mode on tty: %m\n");
return NULL;
}
tty->has_vt = 1;
mode.mode = VT_PROCESS;
mode.relsig = SIGUSR1;
mode.acqsig = SIGUSR1;
if (ioctl(tty->fd, VT_SETMODE, &mode) < 0) {
fprintf(stderr, "failed to take control of vt handling\n");
return NULL;
}
tty->vt_source =
wl_event_loop_add_signal(loop, SIGUSR1, vt_handler, tty);
return tty;
}
void
tty_destroy(struct tty *tty)
{
struct vt_mode mode = { 0 };
if(!tty)
return;
if (ioctl(tty->fd, KDSETMODE, KD_TEXT))
fprintf(stderr,
"failed to set KD_TEXT mode on tty: %m\n");
if (tcsetattr(tty->fd, TCSANOW, &tty->terminal_attributes) < 0)
fprintf(stderr,
"could not restore terminal to canonical mode\n");
mode.mode = VT_AUTO;
if (ioctl(tty->fd, VT_SETMODE, &mode) < 0)
fprintf(stderr, "could not reset vt handling\n");
if (tty->has_vt && tty->vt != tty->starting_vt) {
ioctl(tty->fd, VT_ACTIVATE, tty->starting_vt);
ioctl(tty->fd, VT_WAITACTIVE, tty->starting_vt);
}
wl_event_source_remove(tty->input_source);
wl_event_source_remove(tty->vt_source);
close(tty->fd);
free(tty);
}
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