weston/libweston/launcher-direct.c

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/*
* Copyright © 2012 Benjamin Franzke
* Copyright © 2013 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 "config.h"
#include "compositor.h"
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/vt.h>
#include <linux/kd.h>
#include <linux/major.h>
#include "launcher-impl.h"
#define DRM_MAJOR 226
#ifndef KDSKBMUTE
#define KDSKBMUTE 0x4B51
#endif
#ifdef HAVE_LIBDRM
#include <xf86drm.h>
static inline int
is_drm_master(int drm_fd)
{
drm_magic_t magic;
return drmGetMagic(drm_fd, &magic) == 0 &&
drmAuthMagic(drm_fd, magic) == 0;
}
#else
static inline int
drmDropMaster(int drm_fd)
{
return 0;
}
static inline int
drmSetMaster(int drm_fd)
{
return 0;
}
static inline int
is_drm_master(int drm_fd)
{
return 0;
}
#endif
struct launcher_direct {
struct weston_launcher base;
struct weston_compositor *compositor;
int kb_mode, tty, drm_fd;
struct wl_event_source *vt_source;
};
static int
vt_handler(int signal_number, void *data)
{
struct launcher_direct *launcher = data;
struct weston_compositor *compositor = launcher->compositor;
if (compositor->session_active) {
compositor->session_active = 0;
wl_signal_emit(&compositor->session_signal, compositor);
drmDropMaster(launcher->drm_fd);
ioctl(launcher->tty, VT_RELDISP, 1);
} else {
ioctl(launcher->tty, VT_RELDISP, VT_ACKACQ);
drmSetMaster(launcher->drm_fd);
compositor->session_active = 1;
wl_signal_emit(&compositor->session_signal, compositor);
}
return 1;
}
static int
setup_tty(struct launcher_direct *launcher, int tty)
{
struct wl_event_loop *loop;
struct vt_mode mode = { 0 };
struct stat buf;
char tty_device[32] ="<stdin>";
int ret, kd_mode;
if (tty == 0) {
launcher->tty = dup(tty);
if (launcher->tty == -1) {
weston_log("couldn't dup stdin: %m\n");
return -1;
}
} else {
snprintf(tty_device, sizeof tty_device, "/dev/tty%d", tty);
launcher->tty = open(tty_device, O_RDWR | O_CLOEXEC);
if (launcher->tty == -1) {
weston_log("couldn't open tty %s: %m\n", tty_device);
return -1;
}
}
if (fstat(launcher->tty, &buf) == -1 ||
major(buf.st_rdev) != TTY_MAJOR || minor(buf.st_rdev) == 0) {
weston_log("%s not a vt\n", tty_device);
weston_log("if running weston from ssh, "
"use --tty to specify a tty\n");
goto err_close;
}
ret = ioctl(launcher->tty, KDGETMODE, &kd_mode);
if (ret) {
weston_log("failed to get VT mode: %m\n");
return -1;
}
if (kd_mode != KD_TEXT) {
weston_log("%s is already in graphics mode, "
"is another display server running?\n", tty_device);
goto err_close;
}
ioctl(launcher->tty, VT_ACTIVATE, minor(buf.st_rdev));
ioctl(launcher->tty, VT_WAITACTIVE, minor(buf.st_rdev));
if (ioctl(launcher->tty, KDGKBMODE, &launcher->kb_mode)) {
weston_log("failed to read keyboard mode: %m\n");
goto err_close;
}
if (ioctl(launcher->tty, KDSKBMUTE, 1) &&
ioctl(launcher->tty, KDSKBMODE, K_OFF)) {
weston_log("failed to set K_OFF keyboard mode: %m\n");
goto err_close;
}
ret = ioctl(launcher->tty, KDSETMODE, KD_GRAPHICS);
if (ret) {
weston_log("failed to set KD_GRAPHICS mode on tty: %m\n");
goto err_close;
}
/*
* SIGRTMIN is used as global VT-acquire+release signal. Note that
* SIGRT* must be tested on runtime, as their exact values are not
* known at compile-time. POSIX requires 32 of them to be available.
*/
if (SIGRTMIN > SIGRTMAX) {
weston_log("not enough RT signals available: %u-%u\n",
SIGRTMIN, SIGRTMAX);
ret = -EINVAL;
goto err_close;
}
mode.mode = VT_PROCESS;
mode.relsig = SIGRTMIN;
mode.acqsig = SIGRTMIN;
if (ioctl(launcher->tty, VT_SETMODE, &mode) < 0) {
weston_log("failed to take control of vt handling\n");
goto err_close;
}
loop = wl_display_get_event_loop(launcher->compositor->wl_display);
launcher->vt_source =
wl_event_loop_add_signal(loop, SIGRTMIN, vt_handler, launcher);
if (!launcher->vt_source)
goto err_close;
return 0;
err_close:
close(launcher->tty);
return -1;
}
static int
launcher_direct_open(struct weston_launcher *launcher_base, const char *path, int flags)
{
struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
struct stat s;
int fd;
fd = open(path, flags | O_CLOEXEC);
if (fd == -1)
return -1;
if (fstat(fd, &s) == -1) {
close(fd);
return -1;
}
if (major(s.st_rdev) == DRM_MAJOR) {
launcher->drm_fd = fd;
if (!is_drm_master(fd)) {
weston_log("drm fd not master\n");
close(fd);
return -1;
}
}
return fd;
}
static void
launcher_direct_close(struct weston_launcher *launcher_base, int fd)
{
close(fd);
}
static void
launcher_direct_restore(struct weston_launcher *launcher_base)
{
struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
struct vt_mode mode = { 0 };
if (ioctl(launcher->tty, KDSKBMUTE, 0) &&
ioctl(launcher->tty, KDSKBMODE, launcher->kb_mode))
weston_log("failed to restore kb mode: %m\n");
if (ioctl(launcher->tty, KDSETMODE, KD_TEXT))
weston_log("failed to set KD_TEXT mode on tty: %m\n");
/* We have to drop master before we switch the VT back in
* VT_AUTO, so we don't risk switching to a VT with another
* display server, that will then fail to set drm master. */
drmDropMaster(launcher->drm_fd);
mode.mode = VT_AUTO;
if (ioctl(launcher->tty, VT_SETMODE, &mode) < 0)
weston_log("could not reset vt handling\n");
}
static int
launcher_direct_activate_vt(struct weston_launcher *launcher_base, int vt)
{
struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
return ioctl(launcher->tty, VT_ACTIVATE, vt);
}
static int
launcher_direct_connect(struct weston_launcher **out, struct weston_compositor *compositor,
int tty, const char *seat_id, bool sync_drm)
{
struct launcher_direct *launcher;
if (geteuid() != 0)
return -EINVAL;
launcher = zalloc(sizeof(*launcher));
if (launcher == NULL)
return -ENOMEM;
launcher->base.iface = &launcher_direct_iface;
launcher->compositor = compositor;
if (setup_tty(launcher, tty) == -1) {
free(launcher);
return -1;
}
* (struct launcher_direct **) out = launcher;
return 0;
}
static void
launcher_direct_destroy(struct weston_launcher *launcher_base)
{
struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
launcher_direct_restore(&launcher->base);
wl_event_source_remove(launcher->vt_source);
if (launcher->tty >= 0)
close(launcher->tty);
free(launcher);
}
struct launcher_interface launcher_direct_iface = {
launcher_direct_connect,
launcher_direct_destroy,
launcher_direct_open,
launcher_direct_close,
launcher_direct_activate_vt,
launcher_direct_restore,
};