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xwayland: Stop using UNIX signals for readiness

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The latest Xorg / Xwayland has support for -displayfd being used
in conjunction with an explicit display number. Use that to know
when the X server is ready, rather than UNIX signals, because
they're UNIX signals.
This commit is contained in:
Jasper St. Pierre 2014-04-17 16:05:08 -04:00
parent 745134e066
commit 6a44f04b51
1 changed files with 21 additions and 8 deletions
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29
src/wayland/meta-xwayland.c
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@ -31,7 +31,6 @@
#include <unistd.h> #include <unistd.h>
#include <fcntl.h> #include <fcntl.h>
#include <errno.h> #include <errno.h>
#include <signal.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <sys/un.h> #include <sys/un.h>
#include <sys/wait.h> #include <sys/wait.h>
@ -383,10 +382,16 @@ xserver_finished_init (MetaXWaylandManager *manager)
} }
static gboolean static gboolean
got_sigusr1 (gpointer user_data) on_displayfd_ready (int fd,
GIOCondition condition,
gpointer user_data)
{ {
MetaXWaylandManager *manager = user_data; MetaXWaylandManager *manager = user_data;
/* The server writes its display name to the displayfd
* socket when it's ready. We don't care about the data
* in the socket, just that it wrote something, since
* that means it's ready. */
xserver_finished_init (manager); xserver_finished_init (manager);
return G_SOURCE_REMOVE; return G_SOURCE_REMOVE;
@ -397,6 +402,7 @@ meta_xwayland_start (MetaXWaylandManager *manager,
struct wl_display *wl_display) struct wl_display *wl_display)
{ {
int xwayland_client_fd[2]; int xwayland_client_fd[2];
int displayfd[2];
int fd; int fd;
if (!choose_xdisplay (manager)) if (!choose_xdisplay (manager))
@ -411,10 +417,17 @@ meta_xwayland_start (MetaXWaylandManager *manager,
return 1; return 1;
} }
if (socketpair (AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, displayfd) < 0)
{
g_warning ("displayfd socketpair failed\n");
unlink (manager->lockfile);
return 1;
}
manager->pid = fork (); manager->pid = fork ();
if (manager->pid == 0) if (manager->pid == 0)
{ {
char socket_fd[8], unix_fd[8], abstract_fd[8]; char socket_fd[8], unix_fd[8], abstract_fd[8], displayfd_fd[8];
/* We passed SOCK_CLOEXEC, so dup the FD so it isn't /* We passed SOCK_CLOEXEC, so dup the FD so it isn't
* closed on exec.. */ * closed on exec.. */
@ -428,6 +441,9 @@ meta_xwayland_start (MetaXWaylandManager *manager,
fd = dup (manager->unix_fd); fd = dup (manager->unix_fd);
snprintf (unix_fd, sizeof (unix_fd), "%d", fd); snprintf (unix_fd, sizeof (unix_fd), "%d", fd);
fd = dup (displayfd[1]);
snprintf (displayfd_fd, sizeof (displayfd_fd), "%d", fd);
/* xwayland, please. */ /* xwayland, please. */
if (getenv ("XWAYLAND_STFU")) if (getenv ("XWAYLAND_STFU"))
{ {
@ -438,16 +454,13 @@ meta_xwayland_start (MetaXWaylandManager *manager,
dup2 (dev_null, STDERR_FILENO); dup2 (dev_null, STDERR_FILENO);
} }
/* We have to ignore SIGUSR1 in the child to make sure
* that the server will send it to mutter-wayland. */
signal(SIGUSR1, SIG_IGN);
if (execl (XWAYLAND_PATH, XWAYLAND_PATH, if (execl (XWAYLAND_PATH, XWAYLAND_PATH,
manager->display_name, manager->display_name,
"-rootless", "-rootless",
"-noreset", "-noreset",
"-listen", abstract_fd, "-listen", abstract_fd,
"-listen", unix_fd, "-listen", unix_fd,
"-displayfd", displayfd_fd,
NULL) < 0) NULL) < 0)
{ {
g_error ("Failed to spawn XWayland: %m"); g_error ("Failed to spawn XWayland: %m");
@ -459,7 +472,7 @@ meta_xwayland_start (MetaXWaylandManager *manager,
} }
g_child_watch_add (manager->pid, xserver_died, NULL); g_child_watch_add (manager->pid, xserver_died, NULL);
g_unix_signal_add (SIGUSR1, got_sigusr1, manager); g_unix_fd_add (displayfd[0], G_IO_IN, on_displayfd_ready, manager);
manager->client = wl_client_create (wl_display, xwayland_client_fd[0]); manager->client = wl_client_create (wl_display, xwayland_client_fd[0]);
/* We need to run a mainloop until we know xwayland has a binding /* We need to run a mainloop until we know xwayland has a binding