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/*
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* Copyright © 2011 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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include "xwayland.h"
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#include "shared/helpers.h"
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#include "compositor/weston.h"
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static int
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handle_sigusr1(int signal_number, void *data)
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{
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struct weston_xserver *wxs = data;
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/* We'd be safer if we actually had the struct
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* signalfd_siginfo from the signalfd data and could verify
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* this came from Xwayland.*/
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wxs->wm = weston_wm_create(wxs, wxs->wm_fd);
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wl_event_source_remove(wxs->sigusr1_source);
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return 1;
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}
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static int
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weston_xserver_handle_event(int listen_fd, uint32_t mask, void *data)
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{
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struct weston_xserver *wxs = data;
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char display[8], s[8], abstract_fd[8], unix_fd[8], wm_fd[8];
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int sv[2], wm[2], fd;
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char *xserver = NULL;
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struct weston_config *config = wet_get_config(wxs->compositor);
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struct weston_config_section *section;
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
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weston_log("wl connection socketpair failed\n");
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return 1;
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}
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wm) < 0) {
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weston_log("X wm connection socketpair failed\n");
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return 1;
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}
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wxs->process.pid = fork();
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switch (wxs->process.pid) {
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case 0:
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/* SOCK_CLOEXEC closes both ends, so we need to unset
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* the flag on the client fd. */
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fd = dup(sv[1]);
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if (fd < 0)
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goto fail;
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snprintf(s, sizeof s, "%d", fd);
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setenv("WAYLAND_SOCKET", s, 1);
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snprintf(display, sizeof display, ":%d", wxs->display);
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fd = dup(wxs->abstract_fd);
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if (fd < 0)
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goto fail;
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snprintf(abstract_fd, sizeof abstract_fd, "%d", fd);
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fd = dup(wxs->unix_fd);
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if (fd < 0)
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goto fail;
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snprintf(unix_fd, sizeof unix_fd, "%d", fd);
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fd = dup(wm[1]);
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if (fd < 0)
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goto fail;
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snprintf(wm_fd, sizeof wm_fd, "%d", fd);
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section = weston_config_get_section(config,
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"xwayland", NULL, NULL);
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weston_config_section_get_string(section, "path",
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&xserver, XSERVER_PATH);
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/* Ignore SIGUSR1 in the child, which will make the X
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* server send SIGUSR1 to the parent (weston) when
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* it's done with initialization. During
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* initialization the X server will round trip and
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* block on the wayland compositor, so avoid making
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* blocking requests (like xcb_connect_to_fd) until
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* it's done with that. */
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signal(SIGUSR1, SIG_IGN);
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if (execl(xserver,
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xserver,
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display,
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"-rootless",
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"-listen", abstract_fd,
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"-listen", unix_fd,
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"-wm", wm_fd,
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"-terminate",
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NULL) < 0)
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weston_log("exec of '%s %s -rootless "
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"-listen %s -listen %s -wm %s "
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"-terminate' failed: %m\n",
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xserver, display,
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abstract_fd, unix_fd, wm_fd);
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fail:
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_exit(EXIT_FAILURE);
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default:
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weston_log("forked X server, pid %d\n", wxs->process.pid);
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close(sv[1]);
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wxs->client = wl_client_create(wxs->wl_display, sv[0]);
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close(wm[1]);
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wxs->wm_fd = wm[0];
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weston_watch_process(&wxs->process);
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wl_event_source_remove(wxs->abstract_source);
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wl_event_source_remove(wxs->unix_source);
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break;
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case -1:
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weston_log( "failed to fork\n");
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break;
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}
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return 1;
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}
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static void
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weston_xserver_shutdown(struct weston_xserver *wxs)
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{
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char path[256];
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snprintf(path, sizeof path, "/tmp/.X%d-lock", wxs->display);
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unlink(path);
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snprintf(path, sizeof path, "/tmp/.X11-unix/X%d", wxs->display);
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unlink(path);
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if (wxs->process.pid == 0) {
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wl_event_source_remove(wxs->abstract_source);
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wl_event_source_remove(wxs->unix_source);
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}
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close(wxs->abstract_fd);
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close(wxs->unix_fd);
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if (wxs->wm) {
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weston_wm_destroy(wxs->wm);
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wxs->wm = NULL;
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}
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wxs->loop = NULL;
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}
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static void
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weston_xserver_cleanup(struct weston_process *process, int status)
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{
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struct weston_xserver *wxs =
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container_of(process, struct weston_xserver, process);
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wxs->process.pid = 0;
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wxs->client = NULL;
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wxs->resource = NULL;
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wxs->abstract_source =
|
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wl_event_loop_add_fd(wxs->loop, wxs->abstract_fd,
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|
WL_EVENT_READABLE,
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weston_xserver_handle_event, wxs);
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wxs->unix_source =
|
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wl_event_loop_add_fd(wxs->loop, wxs->unix_fd,
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|
|
WL_EVENT_READABLE,
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|
|
weston_xserver_handle_event, wxs);
|
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if (wxs->wm) {
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|
weston_log("xserver exited, code %d\n", status);
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|
weston_wm_destroy(wxs->wm);
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|
wxs->wm = NULL;
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|
} else {
|
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|
|
/* If the X server crashes before it binds to the
|
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|
|
* xserver interface, shut down and don't try
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|
|
* again. */
|
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|
|
weston_log("xserver crashing too fast: %d\n", status);
|
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|
|
weston_xserver_shutdown(wxs);
|
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|
|
}
|
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|
|
}
|
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static int
|
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|
|
bind_to_abstract_socket(int display)
|
|
|
|
{
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|
|
struct sockaddr_un addr;
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|
|
socklen_t size, name_size;
|
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|
|
int fd;
|
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|
|
fd = socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
|
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|
|
if (fd < 0)
|
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|
|
return -1;
|
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|
|
|
|
|
|
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;
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|
|
if (bind(fd, (struct sockaddr *) &addr, size) < 0) {
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|
|
weston_log("failed to bind to @%s: %m\n", addr.sun_path + 1);
|
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|
|
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)
|
|
|
|
{
|
|
|
|
char pid[16], *end;
|
|
|
|
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) {
|
|
|
|
weston_log("can't read lock file %s: %s\n",
|
|
|
|
lockfile, strerror(errno));
|
|
|
|
if (fd >= 0)
|
|
|
|
close (fd);
|
|
|
|
|
|
|
|
errno = EEXIST;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
other = strtol(pid, &end, 0);
|
|
|
|
if (end != pid + 10) {
|
|
|
|
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 */
|
|
|
|
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) {
|
|
|
|
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. */
|
|
|
|
size = snprintf(pid, sizeof pid, "%10d\n", getpid());
|
|
|
|
if (write(fd, pid, size) != size) {
|
|
|
|
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);
|
|
|
|
|
|
|
|
free(wxs);
|
|
|
|
}
|
|
|
|
|
|
|
|
WL_EXPORT int
|
|
|
|
module_init(struct weston_compositor *compositor,
|
|
|
|
int *argc, char *argv[])
|
|
|
|
|
|
|
|
{
|
|
|
|
struct wl_display *display = compositor->wl_display;
|
|
|
|
struct weston_xserver *wxs;
|
|
|
|
char lockfile[256], display_name[8];
|
|
|
|
|
|
|
|
wxs = zalloc(sizeof *wxs);
|
|
|
|
if (wxs == NULL)
|
|
|
|
return -1;
|
|
|
|
wxs->process.cleanup = weston_xserver_cleanup;
|
|
|
|
wxs->wl_display = display;
|
|
|
|
wxs->compositor = compositor;
|
|
|
|
|
|
|
|
wxs->display = 0;
|
|
|
|
|
|
|
|
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);
|
|
|
|
weston_log("xserver listening on display %s\n", display_name);
|
|
|
|
setenv("DISPLAY", display_name, 1);
|
|
|
|
|
|
|
|
wxs->loop = wl_display_get_event_loop(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);
|
|
|
|
|
|
|
|
wxs->sigusr1_source = wl_event_loop_add_signal(wxs->loop, SIGUSR1,
|
|
|
|
handle_sigusr1, wxs);
|
|
|
|
wxs->destroy_listener.notify = weston_xserver_destroy;
|
|
|
|
wl_signal_add(&compositor->destroy_signal, &wxs->destroy_listener);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|