weston/compositor/xwayland.c

222 lines
5.9 KiB
C

/*
* Copyright © 2011 Intel Corporation
* Copyright © 2016 Giulio Camuffo
*
* 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 <signal.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <libweston/libweston.h>
#include "compositor/weston.h"
#include <libweston/xwayland-api.h>
#include "shared/helpers.h"
struct wet_xwayland {
struct weston_compositor *compositor;
const struct weston_xwayland_api *api;
struct weston_xwayland *xwayland;
struct wl_event_source *sigusr1_source;
struct wl_client *client;
int wm_fd;
struct weston_process process;
};
static int
handle_sigusr1(int signal_number, void *data)
{
struct wet_xwayland *wxw = data;
/* We'd be safer if we actually had the struct
* signalfd_siginfo from the signalfd data and could verify
* this came from Xwayland.*/
wxw->api->xserver_loaded(wxw->xwayland, wxw->client, wxw->wm_fd);
wl_event_source_remove(wxw->sigusr1_source);
return 1;
}
static pid_t
spawn_xserver(void *user_data, const char *display, int abstract_fd, int unix_fd)
{
struct wet_xwayland *wxw = user_data;
pid_t pid;
char s[12], abstract_fd_str[12], unix_fd_str[12], wm_fd_str[12];
int sv[2], wm[2], fd;
char *xserver = NULL;
struct weston_config *config = wet_get_config(wxw->compositor);
struct weston_config_section *section;
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
weston_log("wl connection socketpair failed\n");
return 1;
}
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wm) < 0) {
weston_log("X wm connection socketpair failed\n");
return 1;
}
pid = fork();
switch (pid) {
case 0:
/* SOCK_CLOEXEC closes both ends, so we need to unset
* the flag on the client fd. */
fd = dup(sv[1]);
if (fd < 0)
goto fail;
snprintf(s, sizeof s, "%d", fd);
setenv("WAYLAND_SOCKET", s, 1);
fd = dup(abstract_fd);
if (fd < 0)
goto fail;
snprintf(abstract_fd_str, sizeof abstract_fd_str, "%d", fd);
fd = dup(unix_fd);
if (fd < 0)
goto fail;
snprintf(unix_fd_str, sizeof unix_fd_str, "%d", fd);
fd = dup(wm[1]);
if (fd < 0)
goto fail;
snprintf(wm_fd_str, sizeof wm_fd_str, "%d", fd);
section = weston_config_get_section(config,
"xwayland", NULL, NULL);
weston_config_section_get_string(section, "path",
&xserver, XSERVER_PATH);
/* Ignore SIGUSR1 in the child, which will make the X
* server send SIGUSR1 to the parent (weston) when
* it's done with initialization. During
* initialization the X server will round trip and
* block on the wayland compositor, so avoid making
* blocking requests (like xcb_connect_to_fd) until
* it's done with that. */
signal(SIGUSR1, SIG_IGN);
if (execl(xserver,
xserver,
display,
"-rootless",
#ifdef HAVE_XWAYLAND_LISTENFD
"-listenfd", abstract_fd_str,
"-listenfd", unix_fd_str,
#else
"-listen", abstract_fd_str,
"-listen", unix_fd_str,
#endif
"-wm", wm_fd_str,
"-terminate",
NULL) < 0)
weston_log("exec of '%s %s -rootless "
#ifdef HAVE_XWAYLAND_LISTENFD
"-listenfd %s -listenfd %s "
#else
"-listen %s -listen %s "
#endif
"-wm %s -terminate' failed: %s\n",
xserver, display,
abstract_fd_str, unix_fd_str, wm_fd_str,
strerror(errno));
fail:
_exit(EXIT_FAILURE);
default:
close(sv[1]);
wxw->client = wl_client_create(wxw->compositor->wl_display, sv[0]);
close(wm[1]);
wxw->wm_fd = wm[0];
wxw->process.pid = pid;
wet_watch_process(wxw->compositor, &wxw->process);
break;
case -1:
weston_log("Failed to fork to spawn xserver process\n");
break;
}
return pid;
}
static void
xserver_cleanup(struct weston_process *process, int status)
{
struct wet_xwayland *wxw =
container_of(process, struct wet_xwayland, process);
struct wl_event_loop *loop =
wl_display_get_event_loop(wxw->compositor->wl_display);
wxw->api->xserver_exited(wxw->xwayland, status);
wxw->sigusr1_source = wl_event_loop_add_signal(loop, SIGUSR1,
handle_sigusr1, wxw);
wxw->client = NULL;
}
int
wet_load_xwayland(struct weston_compositor *comp)
{
const struct weston_xwayland_api *api;
struct weston_xwayland *xwayland;
struct wet_xwayland *wxw;
struct wl_event_loop *loop;
if (weston_compositor_load_xwayland(comp) < 0)
return -1;
api = weston_xwayland_get_api(comp);
if (!api) {
weston_log("Failed to get the xwayland module API.\n");
return -1;
}
xwayland = api->get(comp);
if (!xwayland) {
weston_log("Failed to get the xwayland object.\n");
return -1;
}
wxw = zalloc(sizeof *wxw);
if (!wxw)
return -1;
wxw->compositor = comp;
wxw->api = api;
wxw->xwayland = xwayland;
wxw->process.cleanup = xserver_cleanup;
if (api->listen(xwayland, wxw, spawn_xserver) < 0)
return -1;
loop = wl_display_get_event_loop(comp->wl_display);
wxw->sigusr1_source = wl_event_loop_add_signal(loop, SIGUSR1,
handle_sigusr1, wxw);
return 0;
}