dwm

commit 52d7975c56557b19189c30f9b63f706083d0d19b
parent 6674ef332374efc421138f0fd4b65cf28f3045dc
Author: Kris Yotam <krisyotam@protonmail.com>
Date:   Sat, 14 Feb 2026 17:23:46 -0600

Seamless dwm renew: preserve dwmblocks, monitor state, and xresources

- Skip killing autostart processes on restart, let autostart_exec handle seamless handoff
- Enable SEAMLESS_RESTART_PATCH to persist monitor/tag state across renew
- Enable BAR_HIDEVACANTTAGS_PATCH

Diffstat:
M
dwm.c
 | 
16
+++++++++++-----
M
patch/cool_autostart.c
 | 
16
++++++++++++++++
M
patches.h
 | 
4
++--

3 files changed, 29 insertions(+), 7 deletions(-)
diff --git a/dwm.c b/dwm.c
@@ -1327,13 +1327,19 @@ cleanup(void)
 	#endif // SEAMLESS_RESTART_PATCH
 
 	#if COOL_AUTOSTART_PATCH
-	/* kill child processes */
-	for (i = 0; i < autostart_len; i++) {
-		if (0 < autostart_pids[i]) {
-			kill(autostart_pids[i], SIGTERM);
-			waitpid(autostart_pids[i], NULL, 0);
+	/* kill child processes, but not on restart (autostart_exec will handle it) */
+	#if RESTARTSIG_PATCH
+	if (!restart) {
+	#endif // RESTARTSIG_PATCH
+		for (i = 0; i < autostart_len; i++) {
+			if (0 < autostart_pids[i]) {
+				kill(autostart_pids[i], SIGTERM);
+				waitpid(autostart_pids[i], NULL, 0);
+			}
 		}
+	#if RESTARTSIG_PATCH
 	}
+	#endif // RESTARTSIG_PATCH
 	#endif // COOL_AUTOSTART_PATCH
 
 	selmon->lt[selmon->sellt] = &foo;
diff --git a/patch/cool_autostart.c b/patch/cool_autostart.c
@@ -16,6 +16,22 @@ autostart_exec()
 
 	autostart_pids = malloc(autostart_len * sizeof(pid_t));
 	for (p = autostart; *p; i++, p++) {
+		/* kill any existing instance before starting a new one (seamless restart) */
+		FILE *cmd;
+		char pidline[256];
+		pid_t oldpid;
+		int len = snprintf(pidline, sizeof(pidline), "pidof -s %s", *p);
+		if (len > 0 && (size_t)len < sizeof(pidline) && (cmd = popen(pidline, "r"))) {
+			if (fgets(pidline, sizeof(pidline), cmd))  {
+				oldpid = (pid_t)atol(pidline);
+				if (oldpid > 0) {
+					kill(oldpid, SIGTERM);
+					waitpid(oldpid, NULL, WNOHANG);
+				}
+			}
+			pclose(cmd);
+		}
+
 		if ((autostart_pids[i] = fork()) == 0) {
 			setsid();
 
diff --git a/patches.h b/patches.h
@@ -350,7 +350,7 @@
 /* This patch prevents dwm from drawing tags with no clients (i.e. vacant) on the bar.
  * https://dwm.suckless.org/patches/hide_vacant_tags/
  */
-#define BAR_HIDEVACANTTAGS_PATCH 0
+#define BAR_HIDEVACANTTAGS_PATCH 1
 
 /* With this patch dwm's built-in status bar is only shown when HOLDKEY is pressed
  * and the bar will now overlay the display.
@@ -1106,7 +1106,7 @@
  *
  * The above is not persisted across reboots, however.
  */
-#define SEAMLESS_RESTART_PATCH 0
+#define SEAMLESS_RESTART_PATCH 1
 
 /* As opposed to the original patch this only adds a rule option allowing fake fullscreen
  * to be enabled for applications when they start. This is intended to be used in combination