weston/xwayland/launcher.c

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/*
* Copyright © 2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include "xwayland.h"
#include "xwayland-api.h"
#include "shared/helpers.h"
#include "shared/string-helpers.h"
#include "compositor/weston.h"
static int
weston_xserver_handle_event(int listen_fd, uint32_t mask, void *data)
{
struct weston_xserver *wxs = data;
char display[8];
snprintf(display, sizeof display, ":%d", wxs->display);
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wxs->pid = wxs->spawn_func(wxs->user_data, display, wxs->abstract_fd, wxs->unix_fd);
if (wxs->pid == -1) {
weston_log("Failed to spawn the Xwayland server\n");
return 1;
}
weston_log("Spawned Xwayland server, pid %d\n", wxs->pid);
wl_event_source_remove(wxs->abstract_source);
wl_event_source_remove(wxs->unix_source);
return 1;
}
static void
weston_xserver_shutdown(struct weston_xserver *wxs)
{
char path[256];
snprintf(path, sizeof path, "/tmp/.X%d-lock", wxs->display);
unlink(path);
snprintf(path, sizeof path, "/tmp/.X11-unix/X%d", wxs->display);
unlink(path);
if (wxs->pid == 0) {
wl_event_source_remove(wxs->abstract_source);
wl_event_source_remove(wxs->unix_source);
}
close(wxs->abstract_fd);
close(wxs->unix_fd);
if (wxs->wm) {
weston_wm_destroy(wxs->wm);
wxs->wm = NULL;
}
wxs->loop = NULL;
}
static int
bind_to_abstract_socket(int display)
{
struct sockaddr_un addr;
socklen_t size, name_size;
int fd;
fd = socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (fd < 0)
return -1;
addr.sun_family = AF_LOCAL;
name_size = snprintf(addr.sun_path, sizeof addr.sun_path,
"%c/tmp/.X11-unix/X%d", 0, display);
size = offsetof(struct sockaddr_un, sun_path) + name_size;
if (bind(fd, (struct sockaddr *) &addr, size) < 0) {
weston_log("failed to bind to @%s: %m\n", addr.sun_path + 1);
close(fd);
return -1;
}
if (listen(fd, 1) < 0) {
close(fd);
return -1;
}
return fd;
}
static int
bind_to_unix_socket(int display)
{
struct sockaddr_un addr;
socklen_t size, name_size;
int fd;
fd = socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (fd < 0)
return -1;
addr.sun_family = AF_LOCAL;
name_size = snprintf(addr.sun_path, sizeof addr.sun_path,
"/tmp/.X11-unix/X%d", display) + 1;
size = offsetof(struct sockaddr_un, sun_path) + name_size;
unlink(addr.sun_path);
if (bind(fd, (struct sockaddr *) &addr, size) < 0) {
weston_log("failed to bind to %s: %m\n", addr.sun_path);
close(fd);
return -1;
}
if (listen(fd, 1) < 0) {
unlink(addr.sun_path);
close(fd);
return -1;
}
return fd;
}
static int
create_lockfile(int display, char *lockfile, size_t lsize)
{
/* 10 decimal characters, trailing LF and NUL byte; see comment
* at end of function. */
char pid[11];
int fd, size;
pid_t other;
snprintf(lockfile, lsize, "/tmp/.X%d-lock", display);
fd = open(lockfile, O_WRONLY | O_CLOEXEC | O_CREAT | O_EXCL, 0444);
if (fd < 0 && errno == EEXIST) {
fd = open(lockfile, O_CLOEXEC | O_RDONLY);
if (fd < 0 || read(fd, pid, 11) != 11) {
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weston_log("can't read lock file %s: %s\n",
lockfile, strerror(errno));
if (fd >= 0)
close (fd);
errno = EEXIST;
return -1;
}
/* Trim the trailing LF, or at least ensure it's NULL. */
pid[10] = '\0';
if (!safe_strtoint(pid, &other)) {
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weston_log("can't parse lock file %s\n",
lockfile);
close(fd);
errno = EEXIST;
return -1;
}
if (kill(other, 0) < 0 && errno == ESRCH) {
/* stale lock file; unlink and try again */
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weston_log("unlinking stale lock file %s\n", lockfile);
close(fd);
if (unlink(lockfile))
/* If we fail to unlink, return EEXIST
so we try the next display number.*/
errno = EEXIST;
else
errno = EAGAIN;
return -1;
}
close(fd);
errno = EEXIST;
return -1;
} else if (fd < 0) {
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weston_log("failed to create lock file %s: %s\n",
lockfile, strerror(errno));
return -1;
}
/* Subtle detail: we use the pid of the wayland compositor, not the
* xserver in the lock file.
* Also subtle is that we don't emit a trailing NUL to the file, so
* our size here is 11 rather than 12. */
size = dprintf(fd, "%10d\n", getpid());
if (size != 11) {
unlink(lockfile);
close(fd);
return -1;
}
close(fd);
return 0;
}
static void
weston_xserver_destroy(struct wl_listener *l, void *data)
{
struct weston_xserver *wxs =
container_of(l, struct weston_xserver, destroy_listener);
if (!wxs)
return;
if (wxs->loop)
weston_xserver_shutdown(wxs);
weston_debug_scope_destroy(wxs->wm_debug);
free(wxs);
}
static struct weston_xwayland *
weston_xwayland_get(struct weston_compositor *compositor)
{
struct wl_listener *listener;
struct weston_xserver *wxs;
listener = wl_signal_get(&compositor->destroy_signal,
weston_xserver_destroy);
if (!listener)
return NULL;
wxs = wl_container_of(listener, wxs, destroy_listener);
return (struct weston_xwayland *)wxs;
}
static int
weston_xwayland_listen(struct weston_xwayland *xwayland, void *user_data,
weston_xwayland_spawn_xserver_func_t spawn_func)
{
struct weston_xserver *wxs = (struct weston_xserver *)xwayland;
char lockfile[256], display_name[8];
wxs->user_data = user_data;
wxs->spawn_func = spawn_func;
retry:
if (create_lockfile(wxs->display, lockfile, sizeof lockfile) < 0) {
if (errno == EAGAIN) {
goto retry;
} else if (errno == EEXIST) {
wxs->display++;
goto retry;
} else {
free(wxs);
return -1;
}
}
wxs->abstract_fd = bind_to_abstract_socket(wxs->display);
if (wxs->abstract_fd < 0 && errno == EADDRINUSE) {
wxs->display++;
unlink(lockfile);
goto retry;
}
wxs->unix_fd = bind_to_unix_socket(wxs->display);
if (wxs->unix_fd < 0) {
unlink(lockfile);
close(wxs->abstract_fd);
free(wxs);
return -1;
}
snprintf(display_name, sizeof display_name, ":%d", wxs->display);
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weston_log("xserver listening on display %s\n", display_name);
setenv("DISPLAY", display_name, 1);
wxs->loop = wl_display_get_event_loop(wxs->wl_display);
wxs->abstract_source =
wl_event_loop_add_fd(wxs->loop, wxs->abstract_fd,
WL_EVENT_READABLE,
weston_xserver_handle_event, wxs);
wxs->unix_source =
wl_event_loop_add_fd(wxs->loop, wxs->unix_fd,
WL_EVENT_READABLE,
weston_xserver_handle_event, wxs);
return 0;
}
static void
weston_xwayland_xserver_loaded(struct weston_xwayland *xwayland,
struct wl_client *client, int wm_fd)
{
struct weston_xserver *wxs = (struct weston_xserver *)xwayland;
wxs->wm = weston_wm_create(wxs, wm_fd);
wxs->client = client;
}
static void
weston_xwayland_xserver_exited(struct weston_xwayland *xwayland,
int exit_status)
{
struct weston_xserver *wxs = (struct weston_xserver *)xwayland;
wxs->pid = 0;
wxs->client = NULL;
wxs->abstract_source =
wl_event_loop_add_fd(wxs->loop, wxs->abstract_fd,
WL_EVENT_READABLE,
weston_xserver_handle_event, wxs);
wxs->unix_source =
wl_event_loop_add_fd(wxs->loop, wxs->unix_fd,
WL_EVENT_READABLE,
weston_xserver_handle_event, wxs);
if (wxs->wm) {
weston_log("xserver exited, code %d\n", exit_status);
weston_wm_destroy(wxs->wm);
wxs->wm = NULL;
} else {
/* If the X server crashes before it binds to the
* xserver interface, shut down and don't try
* again. */
weston_log("xserver crashing too fast: %d\n", exit_status);
weston_xserver_shutdown(wxs);
}
}
const struct weston_xwayland_api api = {
weston_xwayland_get,
weston_xwayland_listen,
weston_xwayland_xserver_loaded,
weston_xwayland_xserver_exited,
};
extern const struct weston_xwayland_surface_api surface_api;
WL_EXPORT int
weston_module_init(struct weston_compositor *compositor)
{
struct wl_display *display = compositor->wl_display;
struct weston_xserver *wxs;
int ret;
wxs = zalloc(sizeof *wxs);
if (wxs == NULL)
return -1;
wxs->wl_display = display;
wxs->compositor = compositor;
if (weston_xwayland_get_api(compositor) != NULL ||
weston_xwayland_surface_get_api(compositor) != NULL) {
weston_log("The xwayland module APIs are already loaded.\n");
free(wxs);
return -1;
}
ret = weston_plugin_api_register(compositor, WESTON_XWAYLAND_API_NAME,
&api, sizeof(api));
if (ret < 0) {
weston_log("Failed to register the xwayland module API.\n");
free(wxs);
return -1;
}
ret = weston_plugin_api_register(compositor,
WESTON_XWAYLAND_SURFACE_API_NAME,
&surface_api, sizeof(surface_api));
if (ret < 0) {
weston_log("Failed to register the xwayland surface API.\n");
free(wxs);
return -1;
}
wxs->destroy_listener.notify = weston_xserver_destroy;
wl_signal_add(&compositor->destroy_signal, &wxs->destroy_listener);
wxs->wm_debug = weston_compositor_add_debug_scope(wxs->compositor,
"xwm-wm-x11",
"XWM's window management X11 events\n",
NULL, NULL);
return 0;
}