wlroots/backend/session/direct.c

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#define _POSIX_C_SOURCE 200809L
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/input.h>
#include <linux/kd.h>
#include <linux/major.h>
#include <linux/vt.h>
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#include <signal.h>
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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
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#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
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#include <unistd.h>
#include <wayland-server-core.h>
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#include <wlr/backend/session/interface.h>
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#include <wlr/util/log.h>
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#include "backend/session/direct-ipc.h"
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#include "backend/session/session.h"
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#include "util/signal.h"
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enum { DRM_MAJOR = 226 };
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const struct session_impl session_direct;
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struct direct_session {
struct wlr_session base;
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int tty_fd;
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int old_kbmode;
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int sock;
pid_t child;
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struct wl_event_source *vt_source;
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};
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static struct direct_session *direct_session_from_session(
struct wlr_session *base) {
assert(base->impl == &session_direct);
return (struct direct_session *)base;
}
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static int direct_session_open(struct wlr_session *base, const char *path) {
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struct direct_session *session = direct_session_from_session(base);
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int fd = direct_ipc_open(session->sock, path);
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if (fd < 0) {
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wlr_log(WLR_ERROR, "Failed to open %s: %s%s", path, strerror(-fd),
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fd == -EINVAL ? "; is another display server running?" : "");
return fd;
}
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struct stat st;
if (fstat(fd, &st) < 0) {
close(fd);
return -errno;
}
if (major(st.st_rdev) == DRM_MAJOR) {
direct_ipc_setmaster(session->sock, fd);
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}
return fd;
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}
static void direct_session_close(struct wlr_session *base, int fd) {
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struct direct_session *session = direct_session_from_session(base);
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struct stat st;
if (fstat(fd, &st) < 0) {
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wlr_log_errno(WLR_ERROR, "Stat failed");
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close(fd);
return;
}
if (major(st.st_rdev) == DRM_MAJOR) {
direct_ipc_dropmaster(session->sock, fd);
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} else if (major(st.st_rdev) == INPUT_MAJOR) {
ioctl(fd, EVIOCREVOKE, 0);
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}
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close(fd);
}
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static bool direct_change_vt(struct wlr_session *base, unsigned vt) {
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struct direct_session *session = direct_session_from_session(base);
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// Only seat0 has VTs associated with it
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if (strcmp(session->base.seat, "seat0") != 0) {
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return true;
}
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return ioctl(session->tty_fd, VT_ACTIVATE, (int)vt) == 0;
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}
static void direct_session_destroy(struct wlr_session *base) {
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struct direct_session *session = direct_session_from_session(base);
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if (strcmp(session->base.seat, "seat0") == 0) {
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);
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if (errno) {
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wlr_log(WLR_ERROR, "Failed to restore tty");
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}
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wl_event_source_remove(session->vt_source);
close(session->tty_fd);
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}
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direct_ipc_finish(session->sock, session->child);
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close(session->sock);
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free(session);
}
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static int vt_handler(int signo, void *data) {
struct direct_session *session = data;
if (session->base.active) {
session->base.active = false;
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wlr_signal_emit_safe(&session->base.session_signal, session);
struct wlr_device *dev;
wl_list_for_each(dev, &session->base.devices, link) {
if (major(dev->dev) == DRM_MAJOR) {
direct_ipc_dropmaster(session->sock,
dev->fd);
}
}
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ioctl(session->tty_fd, VT_RELDISP, 1);
} else {
ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
struct wlr_device *dev;
wl_list_for_each(dev, &session->base.devices, link) {
if (major(dev->dev) == DRM_MAJOR) {
direct_ipc_setmaster(session->sock,
dev->fd);
}
}
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session->base.active = true;
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wlr_signal_emit_safe(&session->base.session_signal, session);
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}
return 1;
}
static bool setup_tty(struct direct_session *session, struct wl_display *display) {
bool default_tty = false;
const char *tty_path = getenv("WLR_DIRECT_TTY");
if (!tty_path) {
tty_path = "/dev/tty";
default_tty = true;
}
int fd = open(tty_path, O_RDWR | O_CLOEXEC);
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if (fd == -1) {
wlr_log_errno(WLR_ERROR, "Cannot open %s", tty_path);
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return false;
}
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struct vt_stat vt_stat;
if (ioctl(fd, VT_GETSTATE, &vt_stat)) {
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wlr_log_errno(WLR_ERROR, "Could not get current tty number");
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goto error;
}
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int tty = vt_stat.v_active;
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int ret, kd_mode, old_kbmode;
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ret = ioctl(fd, KDGETMODE, &kd_mode);
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if (ret) {
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wlr_log_errno(WLR_ERROR, "Failed to get tty mode");
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goto error;
}
if (default_tty && kd_mode != KD_TEXT) {
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wlr_log(WLR_ERROR,
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"tty already in graphics mode; is another display server running?");
goto error;
}
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ioctl(fd, VT_ACTIVATE, tty);
ioctl(fd, VT_WAITACTIVE, tty);
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if (ioctl(fd, KDGKBMODE, &old_kbmode)) {
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wlr_log_errno(WLR_ERROR, "Failed to read keyboard mode");
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goto error;
}
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if (ioctl(fd, KDSKBMODE, K_OFF)) {
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wlr_log_errno(WLR_ERROR, "Failed to set keyboard mode");
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goto error;
}
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if (ioctl(fd, KDSETMODE, KD_GRAPHICS)) {
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wlr_log_errno(WLR_ERROR, "Failed to set graphics mode on tty");
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goto error;
}
struct vt_mode mode = {
.mode = VT_PROCESS,
.relsig = SIGUSR2,
.acqsig = SIGUSR2,
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};
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if (ioctl(fd, VT_SETMODE, &mode) < 0) {
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wlr_log(WLR_ERROR, "Failed to take control of tty");
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goto error;
}
struct wl_event_loop *loop = wl_display_get_event_loop(display);
session->vt_source = wl_event_loop_add_signal(loop, SIGUSR2,
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vt_handler, session);
if (!session->vt_source) {
goto error;
}
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session->base.vtnr = tty;
session->tty_fd = fd;
session->old_kbmode = old_kbmode;
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return true;
error:
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close(fd);
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return false;
}
static struct wlr_session *direct_session_create(struct wl_display *disp) {
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struct direct_session *session = calloc(1, sizeof(*session));
if (!session) {
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wlr_log_errno(WLR_ERROR, "Allocation failed");
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return NULL;
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}
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session_init(&session->base);
session->sock = direct_ipc_init(&session->child);
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if (session->sock == -1) {
goto error_session;
}
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const char *seat = getenv("XDG_SEAT");
if (!seat) {
seat = "seat0";
}
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if (strcmp(seat, "seat0") == 0) {
if (!setup_tty(session, disp)) {
goto error_ipc;
}
} else {
session->base.vtnr = 0;
session->tty_fd = -1;
}
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snprintf(session->base.seat, sizeof(session->base.seat), "%s", seat);
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session->base.impl = &session_direct;
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session->base.active = true;
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wlr_log(WLR_INFO, "Successfully loaded direct session");
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return &session->base;
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error_ipc:
direct_ipc_finish(session->sock, session->child);
close(session->sock);
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error_session:
free(session);
return NULL;
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}
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const struct session_impl session_direct = {
.create = direct_session_create,
.destroy = direct_session_destroy,
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.open = direct_session_open,
.close = direct_session_close,
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.change_vt = direct_change_vt,
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};