From 3d7c82936e6cbc49c92cdd985f8c3a8588028da5 Mon Sep 17 00:00:00 2001
From: okan <okan>
Date: Wed, 27 Dec 2017 17:04:35 +0000
Subject: [PATCH] Use poll and XNextEvent to replace XNextEvent blocking inside
 the x11 event handler.

---
 calmwm.c  | 12 +++++++++++-
 xevents.c | 12 +++++++-----
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/calmwm.c b/calmwm.c
index fdfc9e5..521d1f9 100644
--- a/calmwm.c
+++ b/calmwm.c
@@ -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 6f38605..19798d3 100644
--- a/xevents.c
+++ b/xevents.c
@@ -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);
+	}
 }