Use poll and XNextEvent to replace XNextEvent blocking inside the x11 event

handler.

2 files changed, 20 insertions, 8 deletions

diff --git a/calmwm.c b/calmwm.c
index df9cbc8..20e3346 100644
--- a/calmwm.c
+++ b/calmwm.c
@@ -15,7 +15,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
- * $OpenBSD: calmwm.c,v 1.103 2017/12/22 21:30:01 okan Exp $
+ * $OpenBSD: calmwm.c,v 1.104 2017/12/27 17:04:35 okan Exp $
  */
 
 #include <sys/types.h>
@@ -27,6 +27,7 @@
 #include <getopt.h>
 #include <limits.h>
 #include <locale.h>
+#include <poll.h>
 #include <pwd.h>
 #include <signal.h>
 #include <stdio.h>
@@ -56,6 +57,7 @@ main(int argc, char **argv)
 	const char	*conf_file = NULL;
 	char		*conf_path, *display_name = NULL;
 	int		 ch, xfd;
+	struct pollfd	 pfd[1];
 	struct passwd	*pw;
 
 	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
@@ -114,8 +116,16 @@ main(int argc, char **argv)
 	if (pledge("stdio rpath proc exec", NULL) == -1)
 		err(1, "pledge");
 
-	while (cwm_status == CWM_RUNNING)
+	memset(&pfd, 0, sizeof(pfd));
+	pfd[0].fd = xfd;
+	pfd[0].events = POLLIN;
+	while (cwm_status == CWM_RUNNING) {
 		xev_process();
+		if (poll(pfd, 1, INFTIM) == -1) {
+			if (errno != EINTR)
+				warn("poll");
+		}
+	}
 	x_teardown();
 	if (cwm_status == CWM_EXEC_WM)
 		u_exec(Conf.wm_argv);
diff --git a/xevents.c b/xevents.c
index f2430aa..71411f8 100644
--- a/xevents.c
+++ b/xevents.c
@@ -15,7 +15,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
- * $OpenBSD: xevents.c,v 1.128 2017/05/09 18:43:40 okan Exp $
+ * $OpenBSD: xevents.c,v 1.129 2017/12/27 17:04:35 okan Exp $
  */
 
 /*
@@ -436,9 +436,11 @@ xev_process(void)
 {
 	XEvent		 e;
 
-	XNextEvent(X_Dpy, &e);
-	if (e.type - Conf.xrandr_event_base == RRScreenChangeNotify)
-		xev_handle_randr(&e);
-	else if (e.type < LASTEvent && xev_handlers[e.type] != NULL)
-		(*xev_handlers[e.type])(&e);
+	while (XPending(X_Dpy)) {
+		XNextEvent(X_Dpy, &e);
+		if (e.type - Conf.xrandr_event_base == RRScreenChangeNotify)
+			xev_handle_randr(&e);
+		else if (e.type < LASTEvent && xev_handlers[e.type] != NULL)
+			(*xev_handlers[e.type])(&e);
+	}
 }