286 lines
8.2 KiB
C
286 lines
8.2 KiB
C
#define _XOPEN_SOURCE 700
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#define _DEFAULT_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <wayland-server.h>
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#include "wlr/util/log.h"
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#include "wlr/xwayland.h"
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#include "sockets.h"
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#include "xwm.h"
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static void safe_close(int fd) {
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if (fd >= 0) {
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close(fd);
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}
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}
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static int unset_cloexec(int fd) {
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if (fcntl(fd, F_SETFD, 0) != 0) {
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wlr_log_errno(L_ERROR, "fcntl() failed on fd %d", fd);
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return -1;
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}
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return 0;
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}
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static int fill_arg(char ***argv, const char *fmt, ...) {
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int len;
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char **cur_arg = *argv;
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va_list args;
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va_start(args, fmt);
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len = vsnprintf(NULL, 0, fmt, args) + 1;
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va_end(args);
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while (*cur_arg) {
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cur_arg++;
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}
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*cur_arg = malloc(len);
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if (!*cur_arg) {
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return -1;
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}
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*argv = cur_arg;
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va_start(args, fmt);
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len = vsnprintf(*cur_arg, len, fmt, args);
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va_end(args);
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return len;
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}
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static void exec_xwayland(struct wlr_xwayland *wlr_xwayland) {
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if (unset_cloexec(wlr_xwayland->x_fd[0]) ||
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unset_cloexec(wlr_xwayland->x_fd[1]) ||
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unset_cloexec(wlr_xwayland->wm_fd[1]) ||
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unset_cloexec(wlr_xwayland->wl_fd[1])) {
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_exit(EXIT_FAILURE);
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}
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/* Make Xwayland signal us when it's ready */
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signal(SIGUSR1, SIG_IGN);
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char *argv[] = {
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"Xwayland", NULL /* display, e.g. :1 */,
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"-rootless", "-terminate",
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"-listen", NULL /* x_fd[0] */,
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"-listen", NULL /* x_fd[1] */,
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"-wm", NULL /* wm_fd[1] */,
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NULL };
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char **cur_arg = argv;
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if (fill_arg(&cur_arg, ":%d", wlr_xwayland->display) < 0 ||
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fill_arg(&cur_arg, "%d", wlr_xwayland->x_fd[0]) < 0 ||
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fill_arg(&cur_arg, "%d", wlr_xwayland->x_fd[1]) < 0 ||
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fill_arg(&cur_arg, "%d", wlr_xwayland->wm_fd[1]) < 0) {
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wlr_log_errno(L_ERROR, "alloc/print failure");
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_exit(EXIT_FAILURE);
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}
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const char *xdg_runtime = getenv("XDG_RUNTIME_DIR");
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if (!xdg_runtime) {
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wlr_log(L_ERROR, "XDG_RUNTIME_DIR is not set");
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_exit(EXIT_FAILURE);
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}
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if (clearenv()) {
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wlr_log_errno(L_ERROR, "clearenv failed");
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_exit(EXIT_FAILURE);
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}
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setenv("XDG_RUNTIME_DIR", xdg_runtime, true);
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char wayland_socket_str[16];
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snprintf(wayland_socket_str, sizeof(wayland_socket_str), "%d", wlr_xwayland->wl_fd[1]);
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setenv("WAYLAND_SOCKET", wayland_socket_str, true);
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wlr_log(L_INFO, "WAYLAND_SOCKET=%d Xwayland :%d -rootless -terminate -listen %d -listen %d -wm %d",
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wlr_xwayland->wl_fd[1], wlr_xwayland->display, wlr_xwayland->x_fd[0],
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wlr_xwayland->x_fd[1], wlr_xwayland->wm_fd[1]);
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// TODO: close stdout/err depending on log level
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execvp("Xwayland", argv);
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}
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static bool wlr_xwayland_init(struct wlr_xwayland *wlr_xwayland,
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struct wl_display *wl_display, struct wlr_compositor *compositor);
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static void wlr_xwayland_finish(struct wlr_xwayland *wlr_xwayland);
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static void xwayland_destroy_event(struct wl_listener *listener, void *data) {
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struct wlr_xwayland *wlr_xwayland = wl_container_of(listener, wlr_xwayland, destroy_listener);
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/* don't call client destroy */
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wlr_xwayland->client = NULL;
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wl_list_remove(&wlr_xwayland->destroy_listener.link);
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wlr_xwayland_finish(wlr_xwayland);
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if (time(NULL) - wlr_xwayland->server_start > 5) {
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wlr_xwayland_init(wlr_xwayland, wlr_xwayland->wl_display,
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wlr_xwayland->compositor);
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}
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}
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static void wlr_xwayland_finish(struct wlr_xwayland *wlr_xwayland) {
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if (!wlr_xwayland || wlr_xwayland->display == -1) {
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return;
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}
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if (wlr_xwayland->client) {
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wl_list_remove(&wlr_xwayland->destroy_listener.link);
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wl_client_destroy(wlr_xwayland->client);
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}
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if (wlr_xwayland->sigusr1_source) {
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wl_event_source_remove(wlr_xwayland->sigusr1_source);
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}
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xwm_destroy(wlr_xwayland->xwm);
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safe_close(wlr_xwayland->x_fd[0]);
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safe_close(wlr_xwayland->x_fd[1]);
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safe_close(wlr_xwayland->wl_fd[0]);
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safe_close(wlr_xwayland->wl_fd[1]);
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safe_close(wlr_xwayland->wm_fd[0]);
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safe_close(wlr_xwayland->wm_fd[1]);
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unlink_display_sockets(wlr_xwayland->display);
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wlr_xwayland->display = -1;
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unsetenv("DISPLAY");
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/* We do not kill the Xwayland process, it dies to broken pipe
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* after we close our side of the wm/wl fds. This is more reliable
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* than trying to kill something that might no longer be Xwayland.
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*/
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}
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static int xserver_handle_ready(int signal_number, void *data) {
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struct wlr_xwayland *wlr_xwayland = data;
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int stat_val = -1;
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while (waitpid(wlr_xwayland->pid, &stat_val, 0) < 0) {
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if (errno == EINTR) {
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continue;
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}
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wlr_log_errno(L_ERROR, "waitpid for Xwayland fork failed");
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return 1;
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}
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if (stat_val) {
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wlr_log(L_ERROR, "Xwayland startup failed, not setting up xwm");
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return 1;
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}
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wlr_log(L_DEBUG, "Xserver is ready");
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wlr_xwayland->xwm = xwm_create(wlr_xwayland);
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if (!wlr_xwayland->xwm) {
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wlr_xwayland_finish(wlr_xwayland);
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return 1;
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}
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wl_event_source_remove(wlr_xwayland->sigusr1_source);
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wlr_xwayland->sigusr1_source = NULL;
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char display_name[16];
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snprintf(display_name, sizeof(display_name), ":%d", wlr_xwayland->display);
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setenv("DISPLAY", display_name, true);
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return 1; /* wayland event loop dispatcher's count */
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}
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static bool wlr_xwayland_init(struct wlr_xwayland *wlr_xwayland,
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struct wl_display *wl_display, struct wlr_compositor *compositor) {
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memset(wlr_xwayland, 0, sizeof(struct wlr_xwayland));
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wlr_xwayland->wl_display = wl_display;
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wlr_xwayland->compositor = compositor;
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wlr_xwayland->x_fd[0] = wlr_xwayland->x_fd[1] = -1;
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wlr_xwayland->wl_fd[0] = wlr_xwayland->wl_fd[1] = -1;
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wlr_xwayland->wm_fd[0] = wlr_xwayland->wm_fd[1] = -1;
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wl_list_init(&wlr_xwayland->displayable_windows);
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wl_signal_init(&wlr_xwayland->events.new_surface);
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wlr_xwayland->display = open_display_sockets(wlr_xwayland->x_fd);
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if (wlr_xwayland->display < 0) {
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wlr_xwayland_finish(wlr_xwayland);
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return false;
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}
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wlr_xwayland->wl_fd) != 0 ||
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socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wlr_xwayland->wm_fd) != 0) {
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wlr_log_errno(L_ERROR, "failed to create socketpair");
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wlr_xwayland_finish(wlr_xwayland);
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return false;
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}
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wlr_xwayland->server_start = time(NULL);
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if (!(wlr_xwayland->client = wl_client_create(wl_display, wlr_xwayland->wl_fd[0]))) {
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wlr_log_errno(L_ERROR, "wl_client_create failed");
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wlr_xwayland_finish(wlr_xwayland);
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return false;
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}
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wlr_xwayland->wl_fd[0] = -1; /* not ours anymore */
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wlr_xwayland->destroy_listener.notify = xwayland_destroy_event;
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wl_client_add_destroy_listener(wlr_xwayland->client, &wlr_xwayland->destroy_listener);
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struct wl_event_loop *loop = wl_display_get_event_loop(wl_display);
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wlr_xwayland->sigusr1_source = wl_event_loop_add_signal(loop, SIGUSR1, xserver_handle_ready, wlr_xwayland);
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if ((wlr_xwayland->pid = fork()) == 0) {
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/* Double-fork, but we need to forward SIGUSR1 once Xserver(1)
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* is ready, or error if there was one. */
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pid_t pid, ppid;
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sigset_t sigset;
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int sig;
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ppid = getppid();
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sigemptyset(&sigset);
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sigaddset(&sigset, SIGUSR1);
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sigaddset(&sigset, SIGCHLD);
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sigprocmask(SIG_BLOCK, &sigset, NULL);
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if ((pid = fork()) == 0) {
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exec_xwayland(wlr_xwayland);
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wlr_log_errno(L_ERROR, "failed to exec Xwayland");
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_exit(EXIT_FAILURE);
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}
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if (pid < 0) {
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wlr_log_errno(L_ERROR, "second fork failed");
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_exit(EXIT_FAILURE);
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}
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sigwait(&sigset, &sig);
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kill(ppid, SIGUSR1);
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wlr_log(L_DEBUG, "sent SIGUSR1 to process %d", ppid);
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if (sig == SIGCHLD) {
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waitpid(pid, NULL, 0);
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_exit(EXIT_FAILURE);
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}
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_exit(EXIT_SUCCESS);
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}
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if (wlr_xwayland->pid < 0) {
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wlr_log_errno(L_ERROR, "fork failed");
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wlr_xwayland_finish(wlr_xwayland);
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return false;
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}
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/* close child fds */
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close(wlr_xwayland->x_fd[0]);
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close(wlr_xwayland->x_fd[1]);
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close(wlr_xwayland->wl_fd[1]);
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close(wlr_xwayland->wm_fd[1]);
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wlr_xwayland->x_fd[0] = wlr_xwayland->x_fd[1] = -1;
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wlr_xwayland->wl_fd[1] = wlr_xwayland->wm_fd[1] = -1;
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return true;
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}
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void wlr_xwayland_destroy(struct wlr_xwayland *wlr_xwayland) {
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wlr_xwayland_finish(wlr_xwayland);
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free(wlr_xwayland);
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}
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struct wlr_xwayland *wlr_xwayland_create(struct wl_display *wl_display,
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struct wlr_compositor *compositor) {
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struct wlr_xwayland *wlr_xwayland = calloc(1, sizeof(struct wlr_xwayland));
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if (wlr_xwayland_init(wlr_xwayland, wl_display, compositor)) {
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return wlr_xwayland;
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}
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free(wlr_xwayland);
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return NULL;
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}
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