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#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/types.h>
#include <dev/evdev/input.h>
#include <sys/kbio.h>
#include <sys/consio.h>
#include <wayland-server.h>
#include <wlr/backend/session/interface.h>
#include <wlr/util/log.h>
#include "backend/session/direct-ipc.h"
const struct session_impl session_direct;
struct direct_session {
struct wlr_session base;
int tty_fd;
int old_kbmode;
int sock;
pid_t child;
struct wl_event_source *vt_source;
};
static int direct_session_open(struct wlr_session *base, const char *path) {
struct direct_session *session = wl_container_of(base, session, base);
int fd = direct_ipc_open(session->sock, path);
if (fd < 0) {
wlr_log(L_ERROR, "Failed to open %s: %s%s", path, strerror(-fd),
fd == -EINVAL ? "; is another display server running?" : "");
return fd;
}
struct stat st;
if (fstat(fd, &st) < 0) {
close(fd);
return -errno;
}
return fd;
}
static void direct_session_close(struct wlr_session *base, int fd) {
struct direct_session *session = wl_container_of(base, session, base);
struct stat st;
if (fstat(fd, &st) < 0) {
wlr_log_errno(L_ERROR, "Stat failed");
close(fd);
return;
}
close(fd);
}
static bool direct_change_vt(struct wlr_session *base, unsigned vt) {
struct direct_session *session = wl_container_of(base, session, base);
return ioctl(session->tty_fd, VT_ACTIVATE, (int)vt) == 0;
}
static void direct_session_destroy(struct wlr_session *base) {
struct direct_session *session = wl_container_of(base, session, base);
struct vt_mode mode = {
.mode = VT_AUTO,
};
errno = 0;
ioctl(session->tty_fd, KDSKBMODE, session->old_kbmode);
ioctl(session->tty_fd, KDSETMODE, KD_TEXT);
ioctl(session->tty_fd, VT_SETMODE, &mode);
if (errno) {
wlr_log(L_ERROR, "Failed to restore tty");
}
direct_ipc_finish(session->sock, session->child);
close(session->sock);
wl_event_source_remove(session->vt_source);
close(session->tty_fd);
free(session);
}
static int vt_handler(int signo, void *data) {
struct direct_session *session = data;
if (session->base.active) {
session->base.active = false;
wl_signal_emit(&session->base.session_signal, session);
ioctl(session->tty_fd, VT_RELDISP, 1);
} else {
ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
session->base.active = true;
wl_signal_emit(&session->base.session_signal, session);
}
return 1;
}
static bool setup_tty(struct direct_session *session, struct wl_display *display) {
int fd = -1, tty = -1, tty0_fd = -1;
if ((tty0_fd = open("/dev/ttyv0", O_RDWR | O_CLOEXEC)) < 0) {
wlr_log_errno(L_ERROR, "Could not open /dev/ttyv0 to find a free vt");
goto error;
}
if (ioctl(tty0_fd, VT_OPENQRY, &tty) != 0) {
wlr_log_errno(L_ERROR, "Could not find a free vt");
goto error;
}
close(tty0_fd);
char tty_path[64];
snprintf(tty_path, sizeof(tty_path), "/dev/ttyv%d", tty - 1);
wlr_log(L_INFO, "Using tty %s", tty_path);
fd = open(tty_path, O_RDWR | O_NOCTTY | O_CLOEXEC);
if (fd == -1) {
wlr_log_errno(L_ERROR, "Cannot open tty");
return false;
}
ioctl(fd, VT_ACTIVATE, tty);
ioctl(fd, VT_WAITACTIVE, tty);
int old_kbmode;
if (ioctl(fd, KDGKBMODE, &old_kbmode)) {
wlr_log_errno(L_ERROR, "Failed to read tty %d keyboard mode", tty);
goto error;
}
if (ioctl(fd, KDSKBMODE, K_CODE)) {
wlr_log_errno(L_ERROR, "Failed to set keyboard mode K_CODE on tty %d", tty);
goto error;
}
if (ioctl(fd, KDSETMODE, KD_GRAPHICS)) {
wlr_log_errno(L_ERROR, "Failed to set graphics mode on tty %d", tty);
goto error;
}
struct vt_mode mode = {
.mode = VT_PROCESS,
.relsig = SIGUSR1,
.acqsig = SIGUSR1,
.frsig = SIGIO, // has to be set
};
if (ioctl(fd, VT_SETMODE, &mode) < 0) {
wlr_log(L_ERROR, "Failed to take control of tty %d", tty);
goto error;
}
struct wl_event_loop *loop = wl_display_get_event_loop(display);
session->vt_source = wl_event_loop_add_signal(loop, SIGUSR1,
vt_handler, session);
if (!session->vt_source) {
goto error;
}
session->base.vtnr = tty;
session->tty_fd = fd;
session->old_kbmode = old_kbmode;
return true;
error:
// Drop back to tty 1, better than hanging in a useless blank console
ioctl(fd, VT_ACTIVATE, 1);
close(fd);
return false;
}
static struct wlr_session *direct_session_create(struct wl_display *disp) {
struct direct_session *session = calloc(1, sizeof(*session));
if (!session) {
wlr_log_errno(L_ERROR, "Allocation failed");
return NULL;
}
session->sock = direct_ipc_init(&session->child);
if (session->sock == -1) {
goto error_session;
}
if (!setup_tty(session, disp)) {
goto error_ipc;
}
wlr_log(L_INFO, "Successfully loaded direct session");
snprintf(session->base.seat, sizeof(session->base.seat), "seat0");
session->base.impl = &session_direct;
return &session->base;
error_ipc:
direct_ipc_finish(session->sock, session->child);
close(session->sock);
error_session:
free(session);
return NULL;
}
const struct session_impl session_direct = {
.create = direct_session_create,
.destroy = direct_session_destroy,
.open = direct_session_open,
.close = direct_session_close,
.change_vt = direct_change_vt,
};
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