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-rw-r--r--src/xwayland/launcher.c389
1 files changed, 389 insertions, 0 deletions
diff --git a/src/xwayland/launcher.c b/src/xwayland/launcher.c
new file mode 100644
index 00000000..8d8e060a
--- /dev/null
+++ b/src/xwayland/launcher.c
@@ -0,0 +1,389 @@
+/*
+ * Copyright © 2011 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 <stdlib.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 "xserver-server-protocol.h"
+
+
+static int
+weston_xserver_handle_event(int listen_fd, uint32_t mask, void *data)
+{
+ struct weston_xserver *wxs = data;
+ char display[8], s[8];
+ int sv[2], client_fd;
+ char *xserver = NULL;
+ struct weston_config_section *section;
+
+ if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
+ weston_log("socketpair failed\n");
+ return 1;
+ }
+
+ wxs->process.pid = fork();
+ switch (wxs->process.pid) {
+ case 0:
+ /* SOCK_CLOEXEC closes both ends, so we need to unset
+ * the flag on the client fd. */
+ client_fd = dup(sv[1]);
+ if (client_fd < 0)
+ return 1;
+
+ snprintf(s, sizeof s, "%d", client_fd);
+ setenv("WAYLAND_SOCKET", s, 1);
+
+ snprintf(display, sizeof display, ":%d", wxs->display);
+
+ section = weston_config_get_section(wxs->compositor->config, "xwayland", NULL, NULL);
+ weston_config_section_get_string(section, "path", &xserver, XSERVER_PATH);
+
+ if (execl(xserver,
+ xserver,
+ display,
+ "-wayland",
+ "-rootless",
+ "-retro",
+ "-nolisten", "all",
+ "-terminate",
+ NULL) < 0)
+ weston_log("exec failed: %m\n");
+ free(xserver);
+ _exit(EXIT_FAILURE);
+
+ default:
+ weston_log("forked X server, pid %d\n", wxs->process.pid);
+
+ close(sv[1]);
+ wxs->client = wl_client_create(wxs->wl_display, sv[0]);
+
+ weston_watch_process(&wxs->process);
+
+ wl_event_source_remove(wxs->abstract_source);
+ wl_event_source_remove(wxs->unix_source);
+ break;
+
+ case -1:
+ weston_log( "failed to fork\n");
+ break;
+ }
+
+ 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->process.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->loop = NULL;
+}
+
+static void
+weston_xserver_cleanup(struct weston_process *process, int status)
+{
+ struct weston_xserver *wxs =
+ container_of(process, struct weston_xserver, process);
+
+ wxs->process.pid = 0;
+ wxs->client = NULL;
+ wxs->resource = 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", 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", status);
+ weston_xserver_shutdown(wxs);
+ }
+}
+
+static void
+bind_xserver(struct wl_client *client,
+ void *data, uint32_t version, uint32_t id)
+{
+ struct weston_xserver *wxs = data;
+
+ /* If it's a different client than the xserver we launched,
+ * don't start the wm. */
+ if (client != wxs->client)
+ return;
+
+ wxs->resource =
+ wl_resource_create(client, &xserver_interface,
+ 1, id);
+ wl_resource_set_implementation(wxs->resource, &xserver_implementation,
+ wxs, NULL);
+
+ wxs->wm = weston_wm_create(wxs);
+ if (wxs->wm == NULL) {
+ weston_log("failed to create wm\n");
+ }
+
+ xserver_send_listen_socket(wxs->resource, wxs->abstract_fd);
+ xserver_send_listen_socket(wxs->resource, wxs->unix_fd);
+}
+
+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: %s\n",
+ addr.sun_path + 1, strerror(errno));
+ 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 (%s)\n",
+ addr.sun_path, strerror(errno));
+ 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);
+ 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);
+
+ wl_global_create(display, &xserver_interface, 1, wxs, bind_xserver);
+
+ wxs->destroy_listener.notify = weston_xserver_destroy;
+ wl_signal_add(&compositor->destroy_signal, &wxs->destroy_listener);
+
+ return 0;
+}
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