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337 lines
8.1 KiB
337 lines
8.1 KiB
/*
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* Copyright © 2012 Benjamin Franzke
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* Copyright © 2013 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "config.h"
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#include "compositor.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <linux/vt.h>
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#include <linux/kd.h>
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#include <linux/major.h>
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#include "launcher-impl.h"
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#define DRM_MAJOR 226
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#ifndef KDSKBMUTE
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#define KDSKBMUTE 0x4B51
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#endif
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/* major()/minor() */
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#ifdef MAJOR_IN_MKDEV
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#include <sys/mkdev.h>
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#endif
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#ifdef MAJOR_IN_SYSMACROS
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#include <sys/sysmacros.h>
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#endif
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#ifdef BUILD_DRM_COMPOSITOR
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#include <xf86drm.h>
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static inline int
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is_drm_master(int drm_fd)
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{
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drm_magic_t magic;
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return drmGetMagic(drm_fd, &magic) == 0 &&
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drmAuthMagic(drm_fd, magic) == 0;
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}
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#else
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static inline int
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drmDropMaster(int drm_fd)
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{
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return 0;
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}
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static inline int
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drmSetMaster(int drm_fd)
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{
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return 0;
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}
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static inline int
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is_drm_master(int drm_fd)
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{
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return 0;
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}
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#endif
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struct launcher_direct {
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struct weston_launcher base;
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struct weston_compositor *compositor;
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int kb_mode, tty, drm_fd;
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struct wl_event_source *vt_source;
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};
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static int
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vt_handler(int signal_number, void *data)
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{
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struct launcher_direct *launcher = data;
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struct weston_compositor *compositor = launcher->compositor;
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if (compositor->session_active) {
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compositor->session_active = 0;
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wl_signal_emit(&compositor->session_signal, compositor);
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drmDropMaster(launcher->drm_fd);
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ioctl(launcher->tty, VT_RELDISP, 1);
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} else {
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ioctl(launcher->tty, VT_RELDISP, VT_ACKACQ);
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drmSetMaster(launcher->drm_fd);
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compositor->session_active = 1;
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wl_signal_emit(&compositor->session_signal, compositor);
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}
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return 1;
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}
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static int
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setup_tty(struct launcher_direct *launcher, int tty)
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{
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struct wl_event_loop *loop;
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struct vt_mode mode = { 0 };
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struct stat buf;
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char tty_device[32] ="<stdin>";
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int ret, kd_mode;
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if (tty == 0) {
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launcher->tty = dup(tty);
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if (launcher->tty == -1) {
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weston_log("couldn't dup stdin: %m\n");
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return -1;
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}
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} else {
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snprintf(tty_device, sizeof tty_device, "/dev/tty%d", tty);
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launcher->tty = open(tty_device, O_RDWR | O_CLOEXEC);
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if (launcher->tty == -1) {
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weston_log("couldn't open tty %s: %m\n", tty_device);
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return -1;
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}
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}
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if (fstat(launcher->tty, &buf) == -1 ||
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major(buf.st_rdev) != TTY_MAJOR || minor(buf.st_rdev) == 0) {
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weston_log("%s not a vt\n", tty_device);
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weston_log("if running weston from ssh, "
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"use --tty to specify a tty\n");
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goto err_close;
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}
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ret = ioctl(launcher->tty, KDGETMODE, &kd_mode);
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if (ret) {
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weston_log("failed to get VT mode: %m\n");
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return -1;
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}
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if (kd_mode != KD_TEXT) {
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weston_log("%s is already in graphics mode, "
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"is another display server running?\n", tty_device);
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goto err_close;
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}
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ioctl(launcher->tty, VT_ACTIVATE, minor(buf.st_rdev));
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ioctl(launcher->tty, VT_WAITACTIVE, minor(buf.st_rdev));
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if (ioctl(launcher->tty, KDGKBMODE, &launcher->kb_mode)) {
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weston_log("failed to read keyboard mode: %m\n");
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goto err_close;
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}
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if (ioctl(launcher->tty, KDSKBMUTE, 1) &&
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ioctl(launcher->tty, KDSKBMODE, K_OFF)) {
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weston_log("failed to set K_OFF keyboard mode: %m\n");
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goto err_close;
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}
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ret = ioctl(launcher->tty, KDSETMODE, KD_GRAPHICS);
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if (ret) {
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weston_log("failed to set KD_GRAPHICS mode on tty: %m\n");
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goto err_close;
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}
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/*
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* SIGRTMIN is used as global VT-acquire+release signal. Note that
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* SIGRT* must be tested on runtime, as their exact values are not
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* known at compile-time. POSIX requires 32 of them to be available.
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*/
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if (SIGRTMIN > SIGRTMAX) {
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weston_log("not enough RT signals available: %u-%u\n",
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SIGRTMIN, SIGRTMAX);
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ret = -EINVAL;
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goto err_close;
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}
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mode.mode = VT_PROCESS;
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mode.relsig = SIGRTMIN;
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mode.acqsig = SIGRTMIN;
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if (ioctl(launcher->tty, VT_SETMODE, &mode) < 0) {
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weston_log("failed to take control of vt handling\n");
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goto err_close;
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}
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loop = wl_display_get_event_loop(launcher->compositor->wl_display);
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launcher->vt_source =
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wl_event_loop_add_signal(loop, SIGRTMIN, vt_handler, launcher);
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if (!launcher->vt_source)
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goto err_close;
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return 0;
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err_close:
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close(launcher->tty);
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return -1;
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}
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static int
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launcher_direct_open(struct weston_launcher *launcher_base, const char *path, int flags)
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{
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struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
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struct stat s;
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int fd;
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fd = open(path, flags | O_CLOEXEC);
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if (fd == -1)
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return -1;
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if (fstat(fd, &s) == -1) {
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close(fd);
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return -1;
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}
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if (major(s.st_rdev) == DRM_MAJOR) {
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launcher->drm_fd = fd;
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if (!is_drm_master(fd)) {
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weston_log("drm fd not master\n");
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close(fd);
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return -1;
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}
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}
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return fd;
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}
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static void
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launcher_direct_close(struct weston_launcher *launcher_base, int fd)
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{
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close(fd);
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}
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static void
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launcher_direct_restore(struct weston_launcher *launcher_base)
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{
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struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
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struct vt_mode mode = { 0 };
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if (ioctl(launcher->tty, KDSKBMUTE, 0) &&
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ioctl(launcher->tty, KDSKBMODE, launcher->kb_mode))
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weston_log("failed to restore kb mode: %m\n");
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if (ioctl(launcher->tty, KDSETMODE, KD_TEXT))
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weston_log("failed to set KD_TEXT mode on tty: %m\n");
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/* We have to drop master before we switch the VT back in
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* VT_AUTO, so we don't risk switching to a VT with another
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* display server, that will then fail to set drm master. */
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drmDropMaster(launcher->drm_fd);
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mode.mode = VT_AUTO;
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if (ioctl(launcher->tty, VT_SETMODE, &mode) < 0)
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weston_log("could not reset vt handling\n");
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}
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static int
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launcher_direct_activate_vt(struct weston_launcher *launcher_base, int vt)
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{
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struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
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return ioctl(launcher->tty, VT_ACTIVATE, vt);
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}
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static int
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launcher_direct_connect(struct weston_launcher **out, struct weston_compositor *compositor,
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int tty, const char *seat_id, bool sync_drm)
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{
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struct launcher_direct *launcher;
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if (geteuid() != 0)
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return -EINVAL;
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launcher = zalloc(sizeof(*launcher));
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if (launcher == NULL)
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return -ENOMEM;
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launcher->base.iface = &launcher_direct_iface;
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launcher->compositor = compositor;
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if (setup_tty(launcher, tty) == -1) {
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free(launcher);
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return -1;
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}
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* (struct launcher_direct **) out = launcher;
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return 0;
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}
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static void
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launcher_direct_destroy(struct weston_launcher *launcher_base)
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{
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struct launcher_direct *launcher = wl_container_of(launcher_base, launcher, base);
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launcher_direct_restore(&launcher->base);
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wl_event_source_remove(launcher->vt_source);
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if (launcher->tty >= 0)
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close(launcher->tty);
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free(launcher);
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}
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static int
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launcher_direct_get_vt(struct weston_launcher *base)
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{
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struct launcher_direct *launcher = wl_container_of(base, launcher, base);
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struct stat s;
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if (fstat(launcher->tty, &s) < 0)
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return -1;
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return minor(s.st_rdev);
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}
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const struct launcher_interface launcher_direct_iface = {
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.connect = launcher_direct_connect,
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.destroy = launcher_direct_destroy,
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.open = launcher_direct_open,
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.close = launcher_direct_close,
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.activate_vt = launcher_direct_activate_vt,
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.get_vt = launcher_direct_get_vt,
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};
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